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07070100000000000041ED00000000000000000000000464388A3F00000000000000000000000000000000000000000000001500000000stern-1.25.0/.github07070100000001000081A400000000000000000000000164388A3F0000002B000000000000000000000000000000000000002000000000stern-1.25.0/.github/CODEOWNERS*   @superbrothers @floryut @rkmathi @tksm
07070100000002000041ED00000000000000000000000264388A3F00000000000000000000000000000000000000000000002400000000stern-1.25.0/.github/ISSUE_TEMPLATE07070100000003000081A400000000000000000000000164388A3F00000183000000000000000000000000000000000000003200000000stern-1.25.0/.github/ISSUE_TEMPLATE/bug-report.md---
name: Bug Report
about: Report a bug encountered while using stern
labels: kind/bug

---

**What happened**:

**What you expected to happen**:

**How to reproduce it (as minimally and precisely as possible)**:

**Anything else we need to know?**:

**Environment**:
- stern version (use `stern --version`):
- OS (e.g: `cat /etc/os-release`):
- Install tools (e.g: Homebrew)
- Others:
07070100000004000081A400000000000000000000000164388A3F00000094000000000000000000000000000000000000003300000000stern-1.25.0/.github/ISSUE_TEMPLATE/enhancement.md---
name: Enhancement Request
about: Suggest an enhancement
labels: kind/feature

---
**What would you like to be added**:

**Why is this needed**:
07070100000005000041ED00000000000000000000000264388A3F00000000000000000000000000000000000000000000001F00000000stern-1.25.0/.github/workflows07070100000006000081A400000000000000000000000164388A3F000002FC000000000000000000000000000000000000002700000000stern-1.25.0/.github/workflows/ci.yamlname: CI

on:
  # Must keep in sync with ci_for_skipped.yaml
  push:
    branches: [master]
    paths-ignore: ['**.md']
  pull_request:
    types: [opened, synchronize]
    paths-ignore: ['**.md']

jobs:
  run:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - uses: actions/setup-go@v3
      with:
        go-version-file: go.mod
        cache: true
    - name: Ensure go.mod is already tidied
      run: go mod tidy && git diff -s --exit-code go.sum
    - name: Run verify-readme
      run: make verify-readme
    - name: Run tests
      run: make test
    - name: Build binary
      run: make build
    - name: Make dist file
      run: make dist
    - name: Validate a krew plugin manifest file
      run: make validate-krew-manifest
07070100000007000081A400000000000000000000000164388A3F000000F9000000000000000000000000000000000000003300000000stern-1.25.0/.github/workflows/ci_for_skipped.yaml# CI for skipped files
name: CI

on:
  push:
    branches: [master]
    paths: ['**.md']
  pull_request:
    types: [opened, synchronize]
    paths: ['**.md']

jobs:
  run:
    runs-on: ubuntu-latest
    steps:
    - run: 'echo "No check required"'
07070100000008000081A400000000000000000000000164388A3F000002AB000000000000000000000000000000000000002C00000000stern-1.25.0/.github/workflows/release.yamlname: Release

on:
  push:
    tags: ["v*"]

jobs:
  run:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v3
    - uses: actions/setup-go@v3
      with:
        go-version-file: go.mod
        cache: true
    - name: Login to GitHub Container Registry
      uses: docker/login-action@v1
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}
    - name: Release
      run: make release
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    - name: Update new version in krew-index
      uses: rajatjindal/krew-release-bot@v0.0.43
      with:
        krew_template_file: dist/stern.yaml
07070100000009000081A400000000000000000000000164388A3F0000001D000000000000000000000000000000000000001800000000stern-1.25.0/.gitignore/dist
/hack/tools/bin
vendor
0707010000000A000081A400000000000000000000000164388A3F00000620000000000000000000000000000000000000001E00000000stern-1.25.0/.goreleaser.yamlbuilds:
- env:
  - CGO_ENABLED=0
  ldflags:
  - -s
  - -w
  - -X github.com/stern/stern/cmd.version={{.Version}}
  - -X github.com/stern/stern/cmd.commit={{.Commit}}
  - -X github.com/stern/stern/cmd.date={{.Date}}
  goos:
  - linux
  - windows
  - darwin
  goarch:
  - amd64
  - arm
  - arm64
archives:
- builds:
  - stern
  name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
  format: tar.gz
  files:
  - LICENSE
  wrap_in_directory: false
checksum:
  name_template: 'checksums.txt'
changelog:
  sort: asc
dockers:
- image_templates:
  - "ghcr.io/stern/stern:latest"
  - "ghcr.io/stern/stern:{{ .Major }}"
  - "ghcr.io/stern/stern:{{ .Major }}.{{ .Minor }}"
  - "ghcr.io/stern/stern:{{ .Major }}.{{ .Minor }}.{{ .Patch }}"
krews:
- skip_upload: true
  homepage: https://github.com/stern/stern
  description: |
    Stern allows you to `tail` multiple pods on Kubernetes and multiple containers
    within the pod. Each result is color coded for quicker debugging.

The query is a regular expression so the pod name can easily be filtered and
    you don't need to specify the exact id (for instance omitting the deployment
    id). If a pod is deleted it gets removed from tail and if a new pod is added it
    automatically gets tailed.

When a pod contains multiple containers Stern can tail all of them too without
    having to do this manually for each one. Simply specify the `container` flag to
    limit what containers to show. By default all containers are listened to.
  short_description: Multi pod and container log tailing
0707010000000B000081A400000000000000000000000164388A3F00002E4F000000000000000000000000000000000000001A00000000stern-1.25.0/CHANGELOG.md# v1.25.0

## :zap: Notable Changes

### Add support for the config file

You can now use the config file to change the default values of stern options. The default config file path is `~/.config/stern/config.yaml`.

```yaml
# <flag name>: <value>
tail: 10
max-log-requests: 999
timestamps: short
```

You can change the config file path with `--config` flag or `STERNCONFIG` environment variable.

## Changes

* Fix the heading level in README.md ([#257](https://github.com/stern/stern/pull/257)) [c2290b4](https://github.com/stern/stern/commit/c2290b4) (Kazuki Suda)
* Update dependencies and tools ([#256](https://github.com/stern/stern/pull/256)) [531f869](https://github.com/stern/stern/commit/531f869) (Kazuki Suda)
* Allow an empty config file ([#255](https://github.com/stern/stern/pull/255)) [c76ea87](https://github.com/stern/stern/commit/c76ea87) (Takashi Kusumi)
* Add support for the config file ([#254](https://github.com/stern/stern/pull/254)) [2fdc298](https://github.com/stern/stern/commit/2fdc298) (Kazuki Suda)
* Make setup-go get Go version from go.mod ([#253](https://github.com/stern/stern/pull/253)) [23feff7](https://github.com/stern/stern/commit/23feff7) (Takashi Kusumi)

# v1.24.0

## :zap: Notable Changes

### Add a short format for timestamps

`--timestamps` flag now accepts a format, one of `default` or `short`.

- `default`: the original format `2006-01-02T15:04:05.000000000Z07:00` (RFC3339Nano with trailing zeros)
- `short`: the new format `01-02 15:04:05` (time.DateTime without year).

If `--timestamps` is specified but without value, `default` is used to maintain backward compatibility.

```
$ stern --timestamps=short -n kube-system ds/kindnet --no-follow --tail 1 --only-log-lines
kindnet-hqn2k kindnet-cni 03-12 09:29:53 I0312 00:29:53.620499       1 main.go:250] Node kind-worker3 has CIDR [10.244.1.0/24]
kindnet-5f4ms kindnet-cni 03-12 09:29:53 I0312 00:29:53.374482       1 main.go:250] Node kind-worker3 has CIDR [10.244.1.0/24]
```

### Add `--node` flag to filter on a specific node

New `--node` flag allows you to filter pods on a specific node. This flag will be helpful when we debug pods on the specific node.

```
# Print a DaemonSet pod on the specific node
stern --node <NODE_NAME> daemonsets/<DS_NAME>

# Print all pods on the specific node
stern --node <NODE_NAME> --all-namespaces --no-follow --max-log-requests 1 .
```

### Highlight matched strings in the log lines with the include option

`--include` flag now highlight matched strings in the log lines.

```
stern --include "\[error\]" .
```

### Add `all` option to `--container-state` flag

`--container-state` flag now accepts `all` that is the same with specifying `running,waiting,terminated`. This change is helpful when we debug CrashLoopBackoff containers.

```
# Before
stern --container-state running,terminated,running <QUERY>

# After
stern --container-state all <QUERY>`
```

## :warning: Breaking Changes

### Add `--max-log-requests` flag to limit concurrent requests

New `--max-log-requests` flag allows you to limit concurrent requests to prevent unintentional load to a cluster. The behavior and the default are different depending on the presence of the `--no-follow` flag.

| `--no-follow` | default | behavior         |
|---------------|---------|------------------|
| specified     | 5       | limits the number of concurrent logs to request |
| not specified | 50      | exits with an error when if it reaches the concurrent limit |

If you want to change to the same behavior as before, specify a sufficiently large value for `--max-log-requests`.

### Change the default of `--container-state` flag to `all`

The default value of `--container-state` has been changed to `all` from `running`. With this change, stern will now show logs of completed (`terminated`) and CrashLoopBackoff (`waiting`) pods in addition to running pods by default.

If you want to change to the same behavior as before, explicitly specify `--container-state` to `running`.

## Changes

* Upgrade golang.org/x/net to fix a dependabot alert ([#250](https://github.com/stern/stern/pull/250)) [e26d049](https://github.com/stern/stern/commit/e26d049) (Kazuki Suda)
* Add a short format for timestamps ([#249](https://github.com/stern/stern/pull/249)) [43ab3f1](https://github.com/stern/stern/commit/43ab3f1) (Takashi Kusumi)
* Bump golangci-lint to v1.51.2 ([#248](https://github.com/stern/stern/pull/248)) [079d158](https://github.com/stern/stern/commit/079d158) (Takashi Kusumi)
* Add dynamic completion for --node flag ([#244](https://github.com/stern/stern/pull/244)) [59d4453](https://github.com/stern/stern/commit/59d4453) (Takashi Kusumi)
* Add --node flag to filter on a specific node ([#243](https://github.com/stern/stern/pull/243)) [f90f70f](https://github.com/stern/stern/commit/f90f70f) (Takashi Kusumi)
* allow flexible log parsing and formatting ([#239](https://github.com/stern/stern/pull/239)) [12a55fa](https://github.com/stern/stern/commit/12a55fa) (Dmytro Milinevskyi)
* Documenting how to get Bash completion in Krew mode ([#240](https://github.com/stern/stern/pull/240)) [24c8716](https://github.com/stern/stern/commit/24c8716) (Jesse Glick)
* Add CI for skipped files ([#241](https://github.com/stern/stern/pull/241)) [7131af2](https://github.com/stern/stern/commit/7131af2) (Takashi Kusumi)
* Replace actions/cache with setup-go's cache ([#238](https://github.com/stern/stern/pull/238)) [74952fd](https://github.com/stern/stern/commit/74952fd) (Takashi Kusumi)
* Make CI jobs faster ([#237](https://github.com/stern/stern/pull/237)) [4bb340d](https://github.com/stern/stern/commit/4bb340d) (Kazuki Suda)
* Refactor options.sternConfig() ([#236](https://github.com/stern/stern/pull/236)) [2315b23](https://github.com/stern/stern/commit/2315b23) (Takashi Kusumi)
* Return error when output option is invalid ([#235](https://github.com/stern/stern/pull/235)) [1c5aa2b](https://github.com/stern/stern/commit/1c5aa2b) (Takashi Kusumi)
* Refactor template logic ([#233](https://github.com/stern/stern/pull/233)) [371daf1](https://github.com/stern/stern/commit/371daf1) (Takashi Kusumi)
* Revert "add support to parse JSON logs ([#228](https://github.com/stern/stern/pull/228))" ([#232](https://github.com/stern/stern/pull/232)) [202f7e8](https://github.com/stern/stern/commit/202f7e8) (Dmytro Milinevskyi)
* Change the default of --container-state to `all` ([#225](https://github.com/stern/stern/pull/225)) [2502c91](https://github.com/stern/stern/commit/2502c91) (Takashi Kusumi)
* Highlight matched strings in the log lines with the include option ([#231](https://github.com/stern/stern/pull/231)) [9fbaa18](https://github.com/stern/stern/commit/9fbaa18) (Kazuki Suda)
* Support resuming from the last log when retrying ([#230](https://github.com/stern/stern/pull/230)) [52894f8](https://github.com/stern/stern/commit/52894f8) (Takashi Kusumi)
* add support to parse JSON logs ([#228](https://github.com/stern/stern/pull/228)) [72a5854](https://github.com/stern/stern/commit/72a5854) (Dmytro Milinevskyi)
* Show initContainers first when --no-follow and --max-log-requests 1 ([#226](https://github.com/stern/stern/pull/226)) [ef753f1](https://github.com/stern/stern/commit/ef753f1) (Takashi Kusumi)
* Add --max-log-requests flag to limit concurrent requests ([#224](https://github.com/stern/stern/pull/224)) [0b939c5](https://github.com/stern/stern/commit/0b939c5) (Takashi Kusumi)
* Improve handling of container termination ([#221](https://github.com/stern/stern/pull/221)) [8312782](https://github.com/stern/stern/commit/8312782) (Takashi Kusumi)
* Allow pods without labels to be selected in the resource query ([#223](https://github.com/stern/stern/pull/223)) [fc51906](https://github.com/stern/stern/commit/fc51906) (Takashi Kusumi)
* Add `all` option to --container-state flag ([#222](https://github.com/stern/stern/pull/222)) [6e0d5fc](https://github.com/stern/stern/commit/6e0d5fc) (Takashi Kusumi)

# v1.23.0

## New features

### Add `--no-follow` flag to exit when all logs have been shown

New `--no-follow` flag allows you to exit when all logs have been shown.

```
stern --no-follow .
```

### Support `<resource>/<name>` form as a query

Stern now supports a Kubernetes resource query in the form `<resource>/<name>`. Pod query can still be used.

```
stern deployment/nginx
```

The following Kubernetes resources are supported:

- daemonset
- deployment
- job
- pod
- replicaset
- replicationcontroller
- service
- statefulset

Shell completion of stern already supports this feature.

### Add --verbosity flag to set log level verbosity

New `--verbosity` flag allows you to set the log level verbosity of Kubernetes client-go. This feature is useful when you want to know how stern interacts with a Kubernetes API server in troubleshooting.

```
stern --verbosity=6 .
```

### Add --only-log-lines flag to print only log lines

New `--only-log-lines` flag allows you to print only log lines (and errors if occur). The difference between not specifying the flag and specifying it is as follows:

```
$ stern . --tail=1 --no-follow
+ nginx-cfbcb7b98-96xsv › nginx
+ nginx-cfbcb7b98-29wn7 › nginx
nginx-cfbcb7b98-96xsv nginx 2023/01/27 13:20:48 [notice] 1#1: start worker process 46
- nginx-cfbcb7b98-96xsv › nginx
nginx-cfbcb7b98-29wn7 nginx 2023/01/27 13:20:45 [notice] 1#1: start worker process 46
- nginx-cfbcb7b98-29wn7 › nginx

$ stern . --tail=1 --no-follow --only-log-lines
nginx-cfbcb7b98-96xsv nginx 2023/01/27 13:20:48 [notice] 1#1: start worker process 46
nginx-cfbcb7b98-29wn7 nginx 2023/01/27 13:20:45 [notice] 1#1: start worker process 46
```

## Changes

* Allow to specify --exclude-pod/container multiple times ([#218](https://github.com/stern/stern/pull/218)) [b04478c](https://github.com/stern/stern/commit/b04478c) (Kazuki Suda)
* Add --only-log-lines flag that prints only log lines ([#216](https://github.com/stern/stern/pull/216)) [995be39](https://github.com/stern/stern/commit/995be39) (Kazuki Suda)
* Fix typo of --verbosity flag ([#215](https://github.com/stern/stern/pull/215)) [6c6db1d](https://github.com/stern/stern/commit/6c6db1d) (Takashi Kusumi)
* Add --verbosity flag to set log level verbosity ([#214](https://github.com/stern/stern/pull/214)) [5327626](https://github.com/stern/stern/commit/5327626) (Takashi Kusumi)
* Add completion for flags with pre-defined choices ([#211](https://github.com/stern/stern/pull/211)) [e03646c](https://github.com/stern/stern/commit/e03646c) (Takashi Kusumi)
* Fix bug where container-state is ignored when no-follow specified ([#210](https://github.com/stern/stern/pull/210)) [1bbee8c](https://github.com/stern/stern/commit/1bbee8c) (Takashi Kusumi)
* Add dynamic completion for a resource query ([#209](https://github.com/stern/stern/pull/209)) [2983c8f](https://github.com/stern/stern/commit/2983c8f) (Takashi Kusumi)
* Support `<resource>/<name>` form as a query ([#208](https://github.com/stern/stern/pull/208)) [7bc45f0](https://github.com/stern/stern/commit/7bc45f0) (Takashi Kusumi)
* Fix indent in update-readme.go ([#207](https://github.com/stern/stern/pull/207)) [daf2464](https://github.com/stern/stern/commit/daf2464) (Takashi Kusumi)
* Update dependencies and tools ([#205](https://github.com/stern/stern/pull/205)) [1bcb576](https://github.com/stern/stern/commit/1bcb576) (Kazuki Suda)
* Add --no-follow flag to exit when all logs have been shown ([#204](https://github.com/stern/stern/pull/204)) [a5e581d](https://github.com/stern/stern/commit/a5e581d) (Takashi Kusumi)
* Use StringArrayVarP for --include and --exclude flags ([#196](https://github.com/stern/stern/pull/196)) [80a68a9](https://github.com/stern/stern/commit/80a68a9) (partcyborg)
* Fix the invalid command in README.md ([#193](https://github.com/stern/stern/pull/193)) [f6e76ba](https://github.com/stern/stern/commit/f6e76ba) (Kazuki Suda)
0707010000000C000081A400000000000000000000000164388A3F00000393000000000000000000000000000000000000001D00000000stern-1.25.0/CONTRIBUTING.md# Contributing

If you want to submit a pull request to fix a bug or enhance an existing
feature, please first open an issue and link to that issue when you
submit your pull request.

If you have any questions about a possible submission, feel free to open
an issue too.

### Pull request process

1. Fork this repository
1. Create a branch in your fork to implement the changes. We recommend using
the issue number as part of your branch name, e.g. `1234-fixes`
1. Ensure that any documentation is updated with the changes that are required
by your fix.
1. Ensure that any samples are updated if the base image has been changed.
1. Submit the pull request. *Do not leave the pull request blank*. Explain exactly
what your changes are meant to do and provide simple steps on how to validate
your changes. Ensure that you reference the issue you created as well.
The pull request will be review before it is merged.
0707010000000D000081A400000000000000000000000164388A3F000000AB000000000000000000000000000000000000001800000000stern-1.25.0/DockerfileFROM gcr.io/distroless/static-debian10
LABEL org.opencontainers.image.source https://github.com/stern/stern
COPY stern /usr/local/bin/
ENTRYPOINT ["/usr/local/bin/stern"]
0707010000000E000081A400000000000000000000000164388A3F00002C5D000000000000000000000000000000000000001500000000stern-1.25.0/LICENSE                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

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APPENDIX: How to apply the Apache License to your work.

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0707010000000F000081A400000000000000000000000164388A3F00000846000000000000000000000000000000000000001600000000stern-1.25.0/MakefileSHELL:=/usr/bin/env bash

.PHONY: build
build:
	go build -o dist/stern .

TOOLS_BIN_DIR := $(CURDIR)/hack/tools/bin
GORELEASER_VERSION ?= v1.17.0
GORELEASER := $(TOOLS_BIN_DIR)/goreleaser
GOLANGCI_LINT_VERSION ?= v1.52.2
GOLANGCI_LINT := $(TOOLS_BIN_DIR)/golangci-lint
VALIDATE_KREW_MAIFEST_VERSION ?= v0.4.3
VALIDATE_KREW_MAIFEST := $(TOOLS_BIN_DIR)/validate-krew-manifest
GORELEASER_FILTER_VERSION ?= v0.3.0
GORELEASER_FILTER := $(TOOLS_BIN_DIR)/goreleaser-filter

$(GORELEASER):
	GOBIN=$(TOOLS_BIN_DIR) go install github.com/goreleaser/goreleaser@$(GORELEASER_VERSION)

$(GOLANGCI_LINT):
	GOBIN=$(TOOLS_BIN_DIR) go install github.com/golangci/golangci-lint/cmd/golangci-lint@$(GOLANGCI_LINT_VERSION)

$(VALIDATE_KREW_MAIFEST):
	GOBIN=$(TOOLS_BIN_DIR) go install sigs.k8s.io/krew/cmd/validate-krew-manifest@$(VALIDATE_KREW_MAIFEST_VERSION)

$(GORELEASER_FILTER):
	GOBIN=$(TOOLS_BIN_DIR) go install github.com/t0yv0/goreleaser-filter@$(GORELEASER_FILTER_VERSION)

.PHONY: build-cross
build-cross: $(GORELEASER)
	$(GORELEASER) build --snapshot --clean

.PHONY: test
test: fmt vet lint
	go test -v ./...

.PHONY: lint
lint: $(GOLANGCI_LINT)
	$(GOLANGCI_LINT) run

.PHONY: fmt
fmt:
	go fmt ./...

.PHONY: vet
vet:
	go vet ./...

README_FILE ?= ./README.md

.PHONY: update-readme
update-readme:
	go run hack/update-readme/update-readme.go $(README_FILE)

.PHONY: verify-readme
verify-readme:
	./hack/verify-readme.sh

.PHONY: validate-krew-manifest
validate-krew-manifest: $(VALIDATE_KREW_MAIFEST)
	$(VALIDATE_KREW_MAIFEST) -manifest dist/stern.yaml -skip-install

.PHONY: dist
dist: $(GORELEASER) $(GORELEASER_FILTER)
	cat .goreleaser.yaml | $(GORELEASER_FILTER) -goos $(shell go env GOOS) -goarch $(shell go env GOARCH) | $(GORELEASER) release -f- --clean --skip-publish --snapshot

.PHONY: dist-all
dist-all: $(GORELEASER)
	$(GORELEASER) release --clean --skip-publish --snapshot

.PHONY: release
release: $(GORELEASER)
	$(GORELEASER) release --clean --skip-validate

.PHONY: clean
clean: clean-tools clean-dist

.PHONY: clean-tools
clean-tools:
	rm -rf $(TOOLS_BIN_DIR)

.PHONY: clean-dist
clean-dist:
	rm -rf ./dist
07070100000010000081A400000000000000000000000164388A3F000041F3000000000000000000000000000000000000001700000000stern-1.25.0/README.md[![Build](https://github.com/stern/stern/workflows/CI/badge.svg)](https://github.com/stern/stern/actions?query=workflow%3ACI+branch%3Amaster)
# stern

*Fork of discontinued [wercker/stern](https://github.com/wercker/stern)*

Stern allows you to `tail` multiple pods on Kubernetes and multiple containers
within the pod. Each result is color coded for quicker debugging.

The query is a regular expression or a Kubernetes resource in the form
 `<resource>/<name>` so the pod name can easily be filtered and
you don't need to specify the exact id (for instance omitting the deployment
id). If a pod is deleted it gets removed from tail and if a new pod is added it
automatically gets tailed.

## Installation

### Download binary

Download a [binary release](https://github.com/stern/stern/releases)

### Build from source

```
go install github.com/stern/stern@latest
```

### asdf (Linux/macOS)

If you use [asdf](https://asdf-vm.com/), you can install like this:
```
asdf plugin-add stern
asdf install stern latest
```

### Homebrew (Linux/macOS)

If you use [Homebrew](https://brew.sh), you can install like this:
```
brew install stern
```

### Krew (Linux/macOS/Windows)

If you use [Krew](https://krew.sigs.k8s.io/) which is the package manager for kubectl plugins, you can install like this:
```
kubectl krew install stern
```

## Usage

```
stern pod-query [flags]
```

The `pod` query is a regular expression or a Kubernetes resource in the form `<resource>/<name>`.

The query is a regular expression when it is not a Kubernetes resource,
so you could provide `"web-\w"` to tail `web-backend` and `web-frontend` pods but not `web-123`.

When the query is in the form `<resource>/<name>` (exact match), you can select all pods belonging
to the specified Kubernetes resource, such as `deployment/nginx`.
Supported Kubernetes resources are `pod`, `replicationcontroller`, `service`, `daemonset`, `deployment`,
`replicaset`, `statefulset` and `job`.

### cli flags

flag                        | default                       | purpose
-----------------------------|-------------------------------|---------
 `--all-namespaces`, `-A`    | `false`                       | If present, tail across all namespaces. A specific namespace is ignored even if specified with --namespace.
 `--color`                   | `auto`                        | Force set color output. 'auto':  colorize if tty attached, 'always': always colorize, 'never': never colorize.
 `--completion`              |                               | Output stern command-line completion code for the specified shell. Can be 'bash', 'zsh' or 'fish'.
 `--config`                  | `~/.config/stern/config.yaml` | Path to the stern config file
 `--container`, `-c`         | `.*`                          | Container name when multiple containers in pod. (regular expression)
 `--container-state`         | `all`                         | Tail containers with state in running, waiting, terminated, or all. 'all' matches all container states. To specify multiple states, repeat this or set comma-separated value.
 `--context`                 |                               | Kubernetes context to use. Default to current context configured in kubeconfig.
 `--ephemeral-containers`    | `true`                        | Include or exclude ephemeral containers.
 `--exclude`, `-e`           | `[]`                          | Log lines to exclude. (regular expression)
 `--exclude-container`, `-E` | `[]`                          | Container name to exclude when multiple containers in pod. (regular expression)
 `--exclude-pod`             | `[]`                          | Pod name to exclude. (regular expression)
 `--field-selector`          |                               | Selector (field query) to filter on. If present, default to ".*" for the pod-query.
 `--include`, `-i`           | `[]`                          | Log lines to include. (regular expression)
 `--init-containers`         | `true`                        | Include or exclude init containers.
 `--kubeconfig`              |                               | Path to kubeconfig file to use. Default to KUBECONFIG variable then ~/.kube/config path.
 `--max-log-requests`        | `-1`                          | Maximum number of concurrent logs to request. Defaults to 50, but 5 when specifying --no-follow
 `--namespace`, `-n`         |                               | Kubernetes namespace to use. Default to namespace configured in kubernetes context. To specify multiple namespaces, repeat this or set comma-separated value.
 `--no-follow`               | `false`                       | Exit when all logs have been shown.
 `--node`                    |                               | Node name to filter on.
 `--only-log-lines`          | `false`                       | Print only log lines
 `--output`, `-o`            | `default`                     | Specify predefined template. Currently support: [default, raw, json, extjson, ppextjson]
 `--prompt`, `-p`            | `false`                       | Toggle interactive prompt for selecting 'app.kubernetes.io/instance' label values.
 `--selector`, `-l`          |                               | Selector (label query) to filter on. If present, default to ".*" for the pod-query.
 `--since`, `-s`             | `48h0m0s`                     | Return logs newer than a relative duration like 5s, 2m, or 3h.
 `--tail`                    | `-1`                          | The number of lines from the end of the logs to show. Defaults to -1, showing all logs.
 `--template`                |                               | Template to use for log lines, leave empty to use --output flag.
 `--template-file`, `-T`     |                               | Path to template to use for log lines, leave empty to use --output flag. It overrides --template option.
 `--timestamps`, `-t`        |                               | Print timestamps with the specified format. One of 'default' or 'short'. If specified but without value, 'default' is used.
 `--timezone`                | `Local`                       | Set timestamps to specific timezone.
 `--verbosity`               | `0`                           | Number of the log level verbosity
 `--version`, `-v`           | `false`                       | Print the version and exit.

See `stern --help` for details

Stern will use the `$KUBECONFIG` environment variable if set. If both the
environment variable and `--kubeconfig` flag are passed the cli flag will be
used.

### config file

You can use the config file to change the default values of stern options. The default config file path is `~/.config/stern/config.yaml`.

```yaml
# <flag name>: <value>
tail: 10
max-log-requests: 999
timestamps: short
```

You can change the config file path with `--config` flag or `STERNCONFIG` environment variable.

### templates

stern supports outputting custom log messages.  There are a few predefined
templates which you can use by specifying the `--output` flag:

| output    | description                                                                                           |
|-----------|-------------------------------------------------------------------------------------------------------|
| `default` | Displays the namespace, pod and container, and decorates it with color depending on --color           |
| `raw`     | Only outputs the log message itself, useful when your logs are json and you want to pipe them to `jq` |
| `json`    | Marshals the log struct to json. Useful for programmatic purposes                                     |

It accepts a custom template through the `--template` flag, which will be
compiled to a Go template and then used for every log message. This Go template
will receive the following struct:

| property        | type   | description                                 |
|-----------------|--------|---------------------------------------------|
| `Message`       | string | The log message itself                      |
| `NodeName`      | string | The node name where the pod is scheduled on |
| `Namespace`     | string | The namespace of the pod                    |
| `PodName`       | string | The name of the pod                         |
| `ContainerName` | string | The name of the container                   |

The following functions are available within the template (besides the [builtin
functions](https://golang.org/pkg/text/template/#hdr-Functions)):

| func            | arguments             | description                                                                       |
|-----------------|-----------------------|-----------------------------------------------------------------------------------|
| `json`          | `object`              | Marshal the object and output it as a json text                                   |
| `color`         | `color.Color, string` | Wrap the text in color (.ContainerColor and .PodColor provided)                   |
| `parseJSON`     | `string`              | Parse string as JSON                                                              |
| `tryParseJSON`  | `string`              | Attemp to parse string as JSON, return nil on failure                             |
| `extjson`       | `string`              | Parse the object as json and output colorized json                                |
| `ppextjson`     | `string`              | Parse the object as json and output pretty-print colorized json                   |
| `toRFC3339Nano` | `object`              | Parse timestamp (string, int, json.Number) and output it using RFC3339Nano format |
| `levelColor`    | `string`              | Print log level using appropriate color                                           |
| `colorBlack`    | `string`              | Print text using black color                                                      |
| `colorRed`      | `string`              | Print text using red color                                                        |
| `colorGreen`    | `string`              | Print text using green color                                                      |
| `colorYellow`   | `string`              | Print text using yellow color                                                     |
| `colorBlue`     | `string`              | Print text using blue color                                                       |
| `colorMagenta`  | `string`              | Print text using magenta color                                                    |
| `colorCyan`     | `string`              | Print text using cyan color                                                       |
| `colorWhite`    | `string`              | Print text using white color                                                      |

### Log level verbosity

You can configure the log level verbosity by the `--verbosity` flag.
It is useful when you want to know how stern interacts with a Kubernetes API server in troubleshooting.

Increasing the verbosity increases the number of logs. `--verbosity 6` would be a good starting point.

### Max log requests

Stern has the maximum number of concurrent logs to request to prevent unintentional load to a cluster.
The number can be configured by the `--max-log-requests` flag.

The behavior and the default are different depending on the presence of the `--no-follow` flag.

The combination of `--max-log-requests 1` and `--no-follow` will be helpful if you want to show logs in order.

## Examples:

Tail the `gateway` container running inside of the `envvars` pod on staging
```
stern envvars --context staging --container gateway
```

Tail the `staging` namespace excluding logs from `istio-proxy` container
```
stern -n staging --exclude-container istio-proxy .
```

Tail the `kube-system` namespace excluding logs from `kube-apiserver` pod
```
stern -n kube-system --exclude-pod kube-apiserver .
```

Show auth activity from 15min ago with timestamps
```
stern auth -t --since 15m
```

Show auth activity with timestamps in specific timezone (default is your local timezone)
```
stern auth -t --timezone Asia/Tokyo
```

Follow the development of `some-new-feature` in minikube
```
stern some-new-feature --context minikube
```

View pods from another namespace
```
stern kubernetes-dashboard --namespace kube-system
```

Tail the pods filtered by `run=nginx` label selector across all namespaces
```
stern --all-namespaces -l run=nginx
```

Follow the `frontend` pods in canary release
```
stern frontend --selector release=canary
```

Tail the pods on `kind-control-plane` node across all namespaces
```
stern --all-namespaces --field-selector spec.nodeName=kind-control-plane
```

Tail the pods created by `deployment/nginx`
```
stern deployment/nginx
```

Pipe the log message to jq:
```
stern backend -o json | jq .
```

Only output the log message itself:
```
stern backend -o raw
```

Output using a custom template:

```
stern --template '{{printf "%s (%s/%s/%s/%s)\n" .Message .NodeName .Namespace .PodName .ContainerName}}' backend
```

Output using a custom template with stern-provided colors:

```
stern --template '{{.Message}} ({{.Namespace}}/{{color .PodColor .PodName}}/{{color .ContainerColor .ContainerName}}){{"\n"}}' backend
```

Output using a custom template with `parseJSON`:

```
stern --template='{{.PodName}}/{{.ContainerName}} {{with $d := .Message | parseJSON}}[{{$d.level}}] {{$d.message}}{{end}}{{"\n"}}' backend
```

Output using a custom template that tries to parse JSON or fallbacks to raw format:

```
stern --template='{{.PodName}}/{{.ContainerName}} {{ with $msg := .Message | tryParseJSON }}[{{ colorGreen (toRFC3339Nano $msg.ts) }}] {{ levelColor $msg.level }} ({{ colorCyan $msg.caller }}) {{ $msg.msg }}{{ else }} {{ .Message }} {{ end }}{{"\n"}}' backend
```

Load custom template from file:

```
stern --template-file=~/.stern.tpl backend
```

Trigger the interactive prompt to select an 'app.kubernetes.io/instance' label value:

```
stern -p
```

Output log lines only:

```
stern . --only-log-lines
```

## Completion

Stern supports command-line auto completion for bash, zsh or fish. `stern
--completion=(bash|zsh|fish)` outputs the shell completion code which work by being
evaluated in `.bashrc`, etc for the specified shell. In addition, Stern
supports dynamic completion for `--namespace`, `--context`, `--node`, a resource query
in the form `<resource>/<name>`, and flags with pre-defined choices.

If you use bash, stern bash completion code depends on the
[bash-completion](https://github.com/scop/bash-completion). On the macOS, you
can install it with homebrew as follows:

```
# If running Bash 3.2
brew install bash-completion

# or, if running Bash 4.1+
brew install bash-completion@2
```

Note that bash-completion must be sourced before sourcing the stern bash
completion code in `.bashrc`.

```sh
source "$(brew --prefix)/etc/profile.d/bash_completion.sh"
source <(stern --completion=bash)
```

If installed via Krew, use:

```bash
source <(kubectl stern --completion bash)
complete -o default -F __start_stern kubectl stern
```

If you use zsh, just source the stern zsh completion code in `.zshrc`.

```sh
source <(stern --completion=zsh)
```

if you use fish shell, just source the stern fish completion code.

```sh
stern --completion=fish | source

# To load completions for each session, execute once:
stern --completion=fish >~/.config/fish/completions/stern.fish
```

## Running with container

You can also use stern using a container:

```
docker run ghcr.io/stern/stern --version
```

If you are using a minikube cluster, you need to run a container as follows:

```
docker run --rm -v "$HOME/.minikube:$HOME/.minikube" -v "$HOME/.kube:/$HOME/.kube" -e KUBECONFIG="$HOME/.kube/config" ghcr.io/stern/stern .
```

You can find image tags in https://github.com/orgs/stern/packages/container/package/stern.

## Running in Kubernetes Pods

If you want to use stern in Kubernetes Pods, you need to create the following ClusterRole and bind it to ServiceAccount.

```yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: stern
rules:
- apiGroups: [""]
  resources: ["pods", "pods/log"]
  verbs: ["get", "watch", "list"]
```

## Contributing to this repository

Please see [CONTRIBUTING](CONTRIBUTING.md) for details.
07070100000011000041ED00000000000000000000000364388A3F00000000000000000000000000000000000000000000001100000000stern-1.25.0/cmd07070100000012000081A400000000000000000000000164388A3F00004AAB000000000000000000000000000000000000001800000000stern-1.25.0/cmd/cmd.go//   Copyright 2016 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package cmd

import (
	"context"
	"encoding/json"
	goflag "flag"
	"fmt"
	"io"
	"os"
	"regexp"
	"strconv"
	"strings"
	"text/template"
	"time"

"github.com/fatih/color"
	"github.com/mitchellh/go-homedir"
	"github.com/pkg/errors"
	"github.com/spf13/cast"
	"github.com/spf13/cobra"
	"github.com/spf13/pflag"
	"github.com/stern/stern/stern"
	"gopkg.in/yaml.v3"
	"k8s.io/apimachinery/pkg/fields"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/cli-runtime/pkg/genericclioptions"
	"k8s.io/klog/v2"
)

// Use "~" to avoid exposing the user name in the help message
var defaultConfigFilePath = "~/.config/stern/config.yaml"

type options struct {
	genericclioptions.IOStreams

excludePod          []string
	container           string
	excludeContainer    []string
	containerStates     []string
	timestamps          string
	timezone            string
	since               time.Duration
	context             string
	namespaces          []string
	kubeConfig          string
	exclude             []string
	include             []string
	initContainers      bool
	ephemeralContainers bool
	allNamespaces       bool
	selector            string
	fieldSelector       string
	tail                int64
	color               string
	version             bool
	completion          string
	template            string
	templateFile        string
	output              string
	prompt              bool
	podQuery            string
	noFollow            bool
	resource            string
	verbosity           int
	onlyLogLines        bool
	maxLogRequests      int
	node                string
	configFilePath      string
}

func NewOptions(streams genericclioptions.IOStreams) *options {
	return &options{
		IOStreams: streams,

color:               "auto",
		container:           ".*",
		containerStates:     []string{stern.ALL_STATES},
		initContainers:      true,
		ephemeralContainers: true,
		output:              "default",
		since:               48 * time.Hour,
		tail:                -1,
		template:            "",
		templateFile:        "",
		timestamps:          "",
		timezone:            "Local",
		prompt:              false,
		noFollow:            false,
		maxLogRequests:      -1,
		configFilePath:      defaultConfigFilePath,
	}
}

func (o *options) Complete(args []string) error {
	if len(args) > 0 {
		if s := args[0]; strings.Contains(s, "/") {
			o.resource = s
		} else {
			o.podQuery = s
		}
	}

envVar, ok := os.LookupEnv("STERNCONFIG")
	if ok {
		o.configFilePath = envVar
	}

return nil
}

func (o *options) Validate() error {
	if !o.prompt && o.podQuery == "" && o.resource == "" && o.selector == "" && o.fieldSelector == "" {
		return errors.New("One of pod-query, --selector, --field-selector or --prompt is required")
	}
	if o.selector != "" && o.resource != "" {
		return errors.New("--selector and the <resource>/<name> query can not be set at the same time")
	}

return nil
}

func (o *options) Run(cmd *cobra.Command) error {
	if err := o.setVerbosity(); err != nil {
		return err
	}

config, err := o.sternConfig()
	if err != nil {
		return err
	}

ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

if o.prompt {
		if err := promptHandler(ctx, config, o.Out); err != nil {
			return err
		}
	}

return stern.Run(ctx, config)
}

func (o *options) sternConfig() (*stern.Config, error) {
	pod, err := regexp.Compile(o.podQuery)
	if err != nil {
		return nil, errors.Wrap(err, "failed to compile regular expression from query")
	}

excludePod, err := compileREs(o.excludePod)
	if err != nil {
		return nil, errors.Wrap(err, "failed to compile regular expression for excluded pod query")
	}

container, err := regexp.Compile(o.container)
	if err != nil {
		return nil, errors.Wrap(err, "failed to compile regular expression for container query")
	}

excludeContainer, err := compileREs(o.excludeContainer)
	if err != nil {
		return nil, errors.Wrap(err, "failed to compile regular expression for excluded container query")
	}

exclude, err := compileREs(o.exclude)
	if err != nil {
		return nil, errors.Wrap(err, "failed to compile regular expression for exclusion filter")
	}

include, err := compileREs(o.include)
	if err != nil {
		return nil, errors.Wrap(err, "failed to compile regular expression for inclusion filter")
	}

containerStates := []stern.ContainerState{}
	for _, containerStateStr := range makeUnique(o.containerStates) {
		containerState, err := stern.NewContainerState(containerStateStr)
		if err != nil {
			return nil, err
		}
		containerStates = append(containerStates, containerState)
	}

labelSelector := labels.Everything()
	if o.selector != "" {
		labelSelector, err = labels.Parse(o.selector)
		if err != nil {
			return nil, errors.Wrap(err, "failed to parse selector as label selector")
		}
	}

fieldSelector, err := o.generateFieldSelector()
	if err != nil {
		return nil, err
	}

var tailLines *int64
	if o.tail != -1 {
		tailLines = &o.tail
	}

switch o.color {
	case "always":
		color.NoColor = false
	case "never":
		color.NoColor = true
	case "auto":
	default:
		return nil, errors.New("color should be one of 'always', 'never', or 'auto'")
	}

template, err := o.generateTemplate()
	if err != nil {
		return nil, err
	}

namespaces := makeUnique(o.namespaces)

var timestampFormat string
	switch o.timestamps {
	case "default":
		timestampFormat = stern.TimestampFormatDefault
	case "short":
		timestampFormat = stern.TimestampFormatShort
	case "":
	default:
		return nil, errors.New("timestamps should be one of 'default', or 'short'")
	}

// --timezone
	location, err := time.LoadLocation(o.timezone)
	if err != nil {
		return nil, err
	}

maxLogRequests := o.maxLogRequests
	if maxLogRequests == -1 {
		if o.noFollow {
			maxLogRequests = 5
		} else {
			maxLogRequests = 50
		}
	}

return &stern.Config{
		KubeConfig:            o.kubeConfig,
		ContextName:           o.context,
		Namespaces:            namespaces,
		PodQuery:              pod,
		ExcludePodQuery:       excludePod,
		Timestamps:            timestampFormat != "",
		TimestampFormat:       timestampFormat,
		Location:              location,
		ContainerQuery:        container,
		ExcludeContainerQuery: excludeContainer,
		ContainerStates:       containerStates,
		Exclude:               exclude,
		Include:               include,
		InitContainers:        o.initContainers,
		EphemeralContainers:   o.ephemeralContainers,
		Since:                 o.since,
		AllNamespaces:         o.allNamespaces,
		LabelSelector:         labelSelector,
		FieldSelector:         fieldSelector,
		TailLines:             tailLines,
		Template:              template,
		Follow:                !o.noFollow,
		Resource:              o.resource,
		OnlyLogLines:          o.onlyLogLines,
		MaxLogRequests:        maxLogRequests,

Out:    o.Out,
		ErrOut: o.ErrOut,
	}, nil
}

// setVerbosity sets the log level verbosity
func (o *options) setVerbosity() error {
	if o.verbosity != 0 {
		// klog does not have an external method to set verbosity,
		// so we need to set it by a flag.
		// See https://github.com/kubernetes/klog/issues/336 for details
		var fs goflag.FlagSet
		klog.InitFlags(&fs)
		return fs.Set("v", strconv.Itoa(o.verbosity))
	}
	return nil
}

// overrideFlagSetDefaultFromConfig overrides the default value of the flagSets
// from the config file
func (o *options) overrideFlagSetDefaultFromConfig(fs *pflag.FlagSet) error {
	expanded, err := homedir.Expand(o.configFilePath)
	if err != nil {
		return err
	}

if o.configFilePath == defaultConfigFilePath {
		if _, err := os.Stat(expanded); os.IsNotExist(err) {
			return nil
		}
	}

configFile, err := os.Open(expanded)
	if err != nil {
		return err
	}

data := make(map[string]interface{})

if err := yaml.NewDecoder(configFile).Decode(data); err != nil && err != io.EOF {
		return err
	}

for name, value := range data {
		flag := fs.Lookup(name)
		if flag == nil {
			// To avoid command execution failure, we only output a warning
			// message instead of exiting with an error if an unknown option is
			// specified.
			klog.Warningf("Unknown option specified in the config file: %s", name)
			continue
		}

// flag has higher priority than the config file
		if flag.Changed {
			continue
		}

if err := flag.Value.Set(fmt.Sprint(value)); err != nil {
			return fmt.Errorf("invalid value %q for %q in the config file: %v", value, name, err)
		}
	}

return nil
}

// AddFlags adds all the flags used by stern.
func (o *options) AddFlags(fs *pflag.FlagSet) {
	fs.BoolVarP(&o.allNamespaces, "all-namespaces", "A", o.allNamespaces, "If present, tail across all namespaces. A specific namespace is ignored even if specified with --namespace.")
	fs.StringVar(&o.color, "color", o.color, "Force set color output. 'auto':  colorize if tty attached, 'always': always colorize, 'never': never colorize.")
	fs.StringVar(&o.completion, "completion", o.completion, "Output stern command-line completion code for the specified shell. Can be 'bash', 'zsh' or 'fish'.")
	fs.StringVarP(&o.container, "container", "c", o.container, "Container name when multiple containers in pod. (regular expression)")
	fs.StringSliceVar(&o.containerStates, "container-state", o.containerStates, "Tail containers with state in running, waiting, terminated, or all. 'all' matches all container states. To specify multiple states, repeat this or set comma-separated value.")
	fs.StringVar(&o.context, "context", o.context, "Kubernetes context to use. Default to current context configured in kubeconfig.")
	fs.StringArrayVarP(&o.exclude, "exclude", "e", o.exclude, "Log lines to exclude. (regular expression)")
	fs.StringArrayVarP(&o.excludeContainer, "exclude-container", "E", o.excludeContainer, "Container name to exclude when multiple containers in pod. (regular expression)")
	fs.StringArrayVar(&o.excludePod, "exclude-pod", o.excludePod, "Pod name to exclude. (regular expression)")
	fs.BoolVar(&o.noFollow, "no-follow", o.noFollow, "Exit when all logs have been shown.")
	fs.StringArrayVarP(&o.include, "include", "i", o.include, "Log lines to include. (regular expression)")
	fs.BoolVar(&o.initContainers, "init-containers", o.initContainers, "Include or exclude init containers.")
	fs.BoolVar(&o.ephemeralContainers, "ephemeral-containers", o.ephemeralContainers, "Include or exclude ephemeral containers.")
	fs.StringVar(&o.kubeConfig, "kubeconfig", o.kubeConfig, "Path to kubeconfig file to use. Default to KUBECONFIG variable then ~/.kube/config path.")
	fs.StringVar(&o.kubeConfig, "kube-config", o.kubeConfig, "Path to kubeconfig file to use.")
	_ = fs.MarkDeprecated("kube-config", "Use --kubeconfig instead.")
	fs.StringSliceVarP(&o.namespaces, "namespace", "n", o.namespaces, "Kubernetes namespace to use. Default to namespace configured in kubernetes context. To specify multiple namespaces, repeat this or set comma-separated value.")
	fs.StringVar(&o.node, "node", o.node, "Node name to filter on.")
	fs.IntVar(&o.maxLogRequests, "max-log-requests", o.maxLogRequests, "Maximum number of concurrent logs to request. Defaults to 50, but 5 when specifying --no-follow")
	fs.StringVarP(&o.output, "output", "o", o.output, "Specify predefined template. Currently support: [default, raw, json, extjson, ppextjson]")
	fs.BoolVarP(&o.prompt, "prompt", "p", o.prompt, "Toggle interactive prompt for selecting 'app.kubernetes.io/instance' label values.")
	fs.StringVarP(&o.selector, "selector", "l", o.selector, "Selector (label query) to filter on. If present, default to \".*\" for the pod-query.")
	fs.StringVar(&o.fieldSelector, "field-selector", o.fieldSelector, "Selector (field query) to filter on. If present, default to \".*\" for the pod-query.")
	fs.DurationVarP(&o.since, "since", "s", o.since, "Return logs newer than a relative duration like 5s, 2m, or 3h.")
	fs.Int64Var(&o.tail, "tail", o.tail, "The number of lines from the end of the logs to show. Defaults to -1, showing all logs.")
	fs.StringVar(&o.template, "template", o.template, "Template to use for log lines, leave empty to use --output flag.")
	fs.StringVarP(&o.templateFile, "template-file", "T", o.templateFile, "Path to template to use for log lines, leave empty to use --output flag. It overrides --template option.")
	fs.StringVarP(&o.timestamps, "timestamps", "t", o.timestamps, "Print timestamps with the specified format. One of 'default' or 'short'. If specified but without value, 'default' is used.")
	fs.StringVar(&o.timezone, "timezone", o.timezone, "Set timestamps to specific timezone.")
	fs.BoolVar(&o.onlyLogLines, "only-log-lines", o.onlyLogLines, "Print only log lines")
	fs.StringVar(&o.configFilePath, "config", o.configFilePath, "Path to the stern config file")
	fs.IntVar(&o.verbosity, "verbosity", o.verbosity, "Number of the log level verbosity")
	fs.BoolVarP(&o.version, "version", "v", o.version, "Print the version and exit.")

fs.Lookup("timestamps").NoOptDefVal = "default"
}

func (o *options) generateTemplate() (*template.Template, error) {
	t := o.template
	if o.templateFile != "" {
		data, err := os.ReadFile(o.templateFile)
		if err != nil {
			return nil, err
		}
		t = string(data)
	}
	if t == "" {
		switch o.output {
		case "default":
			t = "{{color .PodColor .PodName}} {{color .ContainerColor .ContainerName}} {{.Message}}"
			if o.allNamespaces || len(o.namespaces) > 1 {
				t = fmt.Sprintf("{{color .PodColor .Namespace}} %s", t)
			}
		case "raw":
			t = "{{.Message}}"
		case "json":
			t = "{{json .}}"
		case "extjson":
			t = "\"pod\": \"{{color .PodColor .PodName}}\", \"container\": \"{{color .ContainerColor .ContainerName}}\", \"message\": {{extjson .Message}}"
			if o.allNamespaces {
				t = fmt.Sprintf("\"namespace\": \"{{color .PodColor .Namespace}}\", %s", t)
			}
			t = fmt.Sprintf("{%s}", t)
		case "ppextjson":
			t = "  \"pod\": \"{{color .PodColor .PodName}}\",\n  \"container\": \"{{color .ContainerColor .ContainerName}}\",\n  \"message\": {{extjson .Message}}"
			if o.allNamespaces {
				t = fmt.Sprintf("  \"namespace\": \"{{color .PodColor .Namespace}}\",\n%s", t)
			}
			t = fmt.Sprintf("{\n%s\n}", t)
		default:
			return nil, errors.New("output should be one of 'default', 'raw', 'json', 'extjson', and 'ppextjson'")
		}
		t += "\n"
	}

funs := map[string]interface{}{
		"json": func(in interface{}) (string, error) {
			b, err := json.Marshal(in)
			if err != nil {
				return "", err
			}
			return string(b), nil
		},
		"tryParseJSON": func(text string) map[string]interface{} {
			decoder := json.NewDecoder(strings.NewReader(text))
			decoder.UseNumber()
			obj := make(map[string]interface{})
			if err := decoder.Decode(&obj); err != nil {
				return nil
			}
			return obj
		},
		"parseJSON": func(text string) (map[string]interface{}, error) {
			obj := make(map[string]interface{})
			if err := json.Unmarshal([]byte(text), &obj); err != nil {
				return obj, err
			}
			return obj, nil
		},
		"extjson": func(in string) (string, error) {
			if json.Valid([]byte(in)) {
				return strings.TrimSuffix(in, "\n"), nil
			}
			b, err := json.Marshal(in)
			if err != nil {
				return "", err
			}
			return strings.TrimSuffix(string(b), "\n"), nil
		},
		"toRFC3339Nano": func(ts any) string {
			return cast.ToTime(ts).Format(time.RFC3339Nano)
		},
		"toUTC": func(ts any) time.Time {
			return cast.ToTime(ts).UTC()
		},
		"color": func(color color.Color, text string) string {
			return color.SprintFunc()(text)
		},
		"colorBlack":   color.BlackString,
		"colorRed":     color.RedString,
		"colorGreen":   color.GreenString,
		"colorYellow":  color.YellowString,
		"colorBlue":    color.BlueString,
		"colorMagenta": color.MagentaString,
		"colorCyan":    color.CyanString,
		"colorWhite":   color.WhiteString,
		"levelColor": func(level string) string {
			var levelColor *color.Color
			switch strings.ToLower(level) {
			case "debug":
				levelColor = color.New(color.FgMagenta)
			case "info":
				levelColor = color.New(color.FgBlue)
			case "warn":
				levelColor = color.New(color.FgYellow)
			case "error":
				levelColor = color.New(color.FgRed)
			case "dpanic":
				levelColor = color.New(color.FgRed)
			case "panic":
				levelColor = color.New(color.FgRed)
			case "fatal":
				levelColor = color.New(color.FgCyan)
			default:
			}
			return levelColor.SprintFunc()(level)
		},
	}
	template, err := template.New("log").Funcs(funs).Parse(t)
	if err != nil {
		return nil, errors.Wrap(err, "unable to parse template")
	}
	return template, err
}

func (o *options) generateFieldSelector() (fields.Selector, error) {
	var queries []string
	if o.fieldSelector != "" {
		queries = append(queries, o.fieldSelector)
	}
	if o.node != "" {
		queries = append(queries, fmt.Sprintf("spec.nodeName=%s", o.node))
	}
	if len(queries) == 0 {
		return fields.Everything(), nil
	}

fieldSelector, err := fields.ParseSelector(strings.Join(queries, ","))
	if err != nil {
		return nil, errors.Wrap(err, "failed to parse selector as field selector")
	}
	return fieldSelector, nil
}

func NewSternCmd(stream genericclioptions.IOStreams) (*cobra.Command, error) {
	o := NewOptions(stream)

cmd := &cobra.Command{
		Use:   "stern pod-query",
		Short: "Tail multiple pods and containers from Kubernetes",
		RunE: func(cmd *cobra.Command, args []string) error {
			// Output version information and exit
			if o.version {
				outputVersionInfo(o.Out)
				return nil
			}

// Output shell completion code for the specified shell and exit
			if o.completion != "" {
				return runCompletion(o.completion, cmd, o.Out)
			}

if err := o.Complete(args); err != nil {
				return err
			}

if err := o.overrideFlagSetDefaultFromConfig(cmd.Flags()); err != nil {
				return err
			}

if err := o.Validate(); err != nil {
				return err
			}

cmd.SilenceUsage = true

return o.Run(cmd)
		},
		ValidArgsFunction: queryCompletionFunc(o),
	}

o.AddFlags(cmd.Flags())

if err := registerCompletionFuncForFlags(cmd, o); err != nil {
		return cmd, err
	}

return cmd, nil
}

// makeUnique makes items in string slice unique
func makeUnique(items []string) []string {
	result := []string{}
	m := make(map[string]struct{})

for _, item := range items {
		if item == "" {
			continue
		}

if _, ok := m[item]; !ok {
			m[item] = struct{}{}
			result = append(result, item)
		}
	}

return result
}

func compileREs(exprs []string) ([]*regexp.Regexp, error) {
	var regexps []*regexp.Regexp
	for _, s := range exprs {
		re, err := regexp.Compile(s)
		if err != nil {
			return nil, err
		}
		regexps = append(regexps, re)
	}
	return regexps, nil
}
07070100000013000081A400000000000000000000000164388A3F00004929000000000000000000000000000000000000001D00000000stern-1.25.0/cmd/cmd_test.gopackage cmd

import (
	"bytes"
	"os"
	"path/filepath"
	"reflect"
	"regexp"
	"strings"
	"testing"
	"time"

"github.com/fatih/color"
	"github.com/spf13/pflag"
	"github.com/stern/stern/stern"
	"k8s.io/apimachinery/pkg/fields"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/cli-runtime/pkg/genericclioptions"
	"k8s.io/utils/pointer"
)

func TestSternCommand(t *testing.T) {
	tests := []struct {
		name string
		args []string
		out  string
	}{
		{
			"Output version info with --version",
			[]string{"--version"},
			"version: dev",
		},
		{
			"Output completion code for bash with --completion=bash",
			[]string{"--completion=bash"},
			"complete -o default -F __start_stern stern",
		},
	}

for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			streams, _, out, _ := genericclioptions.NewTestIOStreams()
			stern, err := NewSternCmd(streams)
			if err != nil {
				t.Fatal(err)
			}
			stern.SetArgs(tt.args)

if err := stern.Execute(); err != nil {
				t.Fatal(err)
			}

if !strings.Contains(out.String(), tt.out) {
				t.Errorf("expected to contain %s, but actual %s", tt.out, out.String())
			}
		})
	}
}

func TestOptionsComplete(t *testing.T) {
	streams := genericclioptions.NewTestIOStreamsDiscard()

tests := []struct {
		name                   string
		env                    map[string]string
		args                   []string
		expectedConfigFilePath string
	}{
		{
			name:                   "No environment variables",
			env:                    map[string]string{},
			args:                   []string{},
			expectedConfigFilePath: defaultConfigFilePath,
		},
		{
			name: "Set STERNCONFIG env to ./config.yaml",
			env: map[string]string{
				"STERNCONFIG": "./config.yaml",
			},
			args:                   []string{},
			expectedConfigFilePath: "./config.yaml",
		},
	}

for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			for k, v := range tt.env {
				t.Setenv(k, v)
			}

o := NewOptions(streams)
			_ = o.Complete(tt.args)

if tt.expectedConfigFilePath != o.configFilePath {
				t.Errorf("expected %s for configFilePath, but got %s", tt.expectedConfigFilePath, o.configFilePath)
			}
		})
	}
}

func TestOptionsValidate(t *testing.T) {
	streams := genericclioptions.NewTestIOStreamsDiscard()

tests := []struct {
		name string
		o    *options
		err  string
	}{
		{
			"No required options",
			NewOptions(streams),
			"One of pod-query, --selector, --field-selector or --prompt is required",
		},
		{
			"Specify both selector and resource",
			func() *options {
				o := NewOptions(streams)
				o.selector = "app=nginx"
				o.resource = "deployment/nginx"

return o
			}(),
			"--selector and the <resource>/<name> query can not be set at the same time",
		},
		{
			"Use prompt",
			func() *options {
				o := NewOptions(streams)
				o.prompt = true

return o
			}(),
			"",
		},
		{
			"Specify pod-query",
			func() *options {
				o := NewOptions(streams)
				o.podQuery = "."

return o
			}(),
			"",
		},
		{
			"Specify selector",
			func() *options {
				o := NewOptions(streams)
				o.selector = "app=nginx"

return o
			}(),
			"",
		},
		{
			"Specify fieldSelector",
			func() *options {
				o := NewOptions(streams)
				o.fieldSelector = "spec.nodeName=kind-kind"

return o
			}(),
			"",
		},
	}

for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := tt.o.Validate()
			if err == nil {
				if tt.err != "" {
					t.Errorf("expected %q err, but actual no err", tt.err)
				}
			} else {
				if tt.err != err.Error() {
					t.Errorf("expected %q err, but actual %q", tt.err, err)
				}
			}
		})
	}
}

func TestOptionsGenerateTemplate(t *testing.T) {
	t.Setenv("NO_COLOR", "1")
	streams := genericclioptions.NewTestIOStreamsDiscard()

tests := []struct {
		name      string
		o         *options
		message   string
		want      string
		wantError bool
	}{
		{
			"output=default",
			func() *options {
				o := NewOptions(streams)
				o.output = "default"

return o
			}(),
			"default message",
			"pod1 container1 default message\n",
			false,
		},
		{
			"output=default+allNamespaces",
			func() *options {
				o := NewOptions(streams)
				o.output = "default"
				o.allNamespaces = true

return o
			}(),
			"default message",
			"ns1 pod1 container1 default message\n",
			false,
		},
		{
			"output=raw",
			func() *options {
				o := NewOptions(streams)
				o.output = "raw"

return o
			}(),
			"raw message",
			"raw message\n",
			false,
		},
		{
			"output=json",
			func() *options {
				o := NewOptions(streams)
				o.output = "json"

return o
			}(),
			"json message",
			`{"message":"json message","nodeName":"node1","namespace":"ns1","podName":"pod1","containerName":"container1"}
`,
			false,
		},
		{
			"output=extjson",
			func() *options {
				o := NewOptions(streams)
				o.output = "extjson"

return o
			}(),
			`{"msg":"extjson message"}`,
			`{"pod": "pod1", "container": "container1", "message": {"msg":"extjson message"}}
`,
			false,
		},
		{
			"output=extjson+allNamespaces",
			func() *options {
				o := NewOptions(streams)
				o.output = "extjson"
				o.allNamespaces = true

return o
			}(),
			`{"msg":"extjson message"}`,
			`{"namespace": "ns1", "pod": "pod1", "container": "container1", "message": {"msg":"extjson message"}}
`,
			false,
		},
		{
			"output=ppextjson",
			func() *options {
				o := NewOptions(streams)
				o.output = "ppextjson"

return o
			}(),
			`{"msg":"ppextjson message"}`,
			`{
  "pod": "pod1",
  "container": "container1",
  "message": {"msg":"ppextjson message"}
}
`,
			false,
		},
		{
			"output=ppextjson+allNamespaces",
			func() *options {
				o := NewOptions(streams)
				o.output = "ppextjson"
				o.allNamespaces = true

return o
			}(),
			`{"msg":"ppextjson message"}`,
			`{
  "namespace": "ns1",
  "pod": "pod1",
  "container": "container1",
  "message": {"msg":"ppextjson message"}
}
`,
			false,
		},
		{
			"invalid output",
			func() *options {
				o := NewOptions(streams)
				o.output = "invalid"

return o
			}(),
			"message",
			"",
			true,
		},
		{
			"template",
			func() *options {
				o := NewOptions(streams)
				o.template = "Message={{.Message}} NodeName={{.NodeName}} Namespace={{.Namespace}} PodName={{.PodName}} ContainerName={{.ContainerName}}"

return o
			}(),
			"template message", // no new line
			"Message=template message NodeName=node1 Namespace=ns1 PodName=pod1 ContainerName=container1",
			false,
		},
		{
			"invalid template",
			func() *options {
				o := NewOptions(streams)
				o.template = "{{invalid"

return o
			}(),
			"template message",
			"",
			true,
		},
		{
			"template-file",
			func() *options {
				o := NewOptions(streams)
				o.templateFile = "test.tpl"

return o
			}(),
			"template message",
			"pod1 container1 template message",
			false,
		},
		{
			"template-file-json-log-ts-float",
			func() *options {
				o := NewOptions(streams)
				o.templateFile = "test.tpl"

return o
			}(),
			`{"ts": 123, "level": "INFO", "msg": "template message"}`,
			"pod1 container1 [1970-01-01T00:02:03Z] INFO template message",
			false,
		},
		{
			"template-file-json-log-ts-str",
			func() *options {
				o := NewOptions(streams)
				o.templateFile = "test.tpl"

return o
			}(),
			`{"ts": "1970-01-01T01:02:03+01:00", "level": "INFO", "msg": "template message"}`,
			"pod1 container1 [1970-01-01T00:02:03Z] INFO template message",
			false,
		},
	}

for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			log := stern.Log{
				Message:        tt.message,
				NodeName:       "node1",
				Namespace:      "ns1",
				PodName:        "pod1",
				ContainerName:  "container1",
				PodColor:       color.New(color.FgRed),
				ContainerColor: color.New(color.FgBlue),
			}
			tmpl, err := tt.o.generateTemplate()

if tt.wantError {
				if err == nil {
					t.Errorf("expected error, but got no error")
				}
				return
			}
			if err != nil {
				t.Errorf("unexpected error: %v", err)
				return
			}

var buf bytes.Buffer
			if err := tmpl.Execute(&buf, log); err != nil {
				t.Errorf("unexpected error: %v", err)
				return
			}
			if want, got := tt.want, buf.String(); want != got {
				t.Errorf("want %v, but got %v", want, got)
			}
		})
	}
}

func TestOptionsSternConfig(t *testing.T) {
	streams := genericclioptions.NewTestIOStreamsDiscard()

local, _ := time.LoadLocation("Local")
	utc, _ := time.LoadLocation("UTC")
	labelSelector, _ := labels.Parse("l=sel")
	fieldSelector, _ := fields.ParseSelector("f=field,spec.nodeName=node1")

re := regexp.MustCompile

defaultConfig := func() *stern.Config {
		return &stern.Config{
			KubeConfig:            "",
			ContextName:           "",
			Namespaces:            []string{},
			PodQuery:              re(""),
			ExcludePodQuery:       nil,
			Timestamps:            false,
			TimestampFormat:       "",
			Location:              local,
			ContainerQuery:        re(".*"),
			ExcludeContainerQuery: nil,
			ContainerStates:       []stern.ContainerState{stern.ALL_STATES},
			Exclude:               nil,
			Include:               nil,
			InitContainers:        true,
			EphemeralContainers:   true,
			Since:                 48 * time.Hour,
			AllNamespaces:         false,
			LabelSelector:         labels.Everything(),
			FieldSelector:         fields.Everything(),
			TailLines:             nil,
			Template:              nil, // ignore when comparing
			Follow:                true,
			Resource:              "",
			OnlyLogLines:          false,
			MaxLogRequests:        50,

Out:    streams.Out,
			ErrOut: streams.ErrOut,
		}
	}

tests := []struct {
		name      string
		o         *options
		want      *stern.Config
		wantError bool
	}{
		{
			"default",
			NewOptions(streams),
			defaultConfig(),
			false,
		},
		{
			"change all options",
			func() *options {
				o := NewOptions(streams)
				o.kubeConfig = "kubeconfig1"
				o.context = "context1"
				o.namespaces = []string{"ns1", "ns2"}
				o.podQuery = "query1"
				o.excludePod = []string{"exp1", "exp2"}
				o.timestamps = "default"
				o.timezone = "UTC" // Location
				o.container = "container1"
				o.excludeContainer = []string{"exc1", "exc2"}
				o.containerStates = []string{"running", "terminated"}
				o.exclude = []string{"ex1", "ex2"}
				o.include = []string{"in1", "in2"}
				o.initContainers = false
				o.ephemeralContainers = false
				o.since = 1 * time.Hour
				o.allNamespaces = true
				o.selector = "l=sel"
				o.fieldSelector = "f=field"
				o.tail = 10
				o.noFollow = true // Follow = false
				o.maxLogRequests = 30
				o.resource = "res1"
				o.onlyLogLines = true
				o.node = "node1"

return o
			}(),
			func() *stern.Config {
				c := defaultConfig()
				c.KubeConfig = "kubeconfig1"
				c.ContextName = "context1"
				c.Namespaces = []string{"ns1", "ns2"}
				c.PodQuery = re("query1")
				c.ExcludePodQuery = []*regexp.Regexp{re("exp1"), re("exp2")}
				c.Timestamps = true
				c.TimestampFormat = stern.TimestampFormatDefault
				c.Location = utc
				c.ContainerQuery = re("container1")
				c.ExcludeContainerQuery = []*regexp.Regexp{re("exc1"), re("exc2")}
				c.ContainerStates = []stern.ContainerState{stern.RUNNING, stern.TERMINATED}
				c.Exclude = []*regexp.Regexp{re("ex1"), re("ex2")}
				c.Include = []*regexp.Regexp{re("in1"), re("in2")}
				c.InitContainers = false
				c.EphemeralContainers = false
				c.Since = 1 * time.Hour
				c.AllNamespaces = true
				c.LabelSelector = labelSelector
				c.FieldSelector = fieldSelector
				c.TailLines = pointer.Int64(10)
				c.Follow = false
				c.Resource = "res1"
				c.OnlyLogLines = true
				c.MaxLogRequests = 30

return c
			}(),
			false,
		},
		{
			"fieldSelector without node",
			func() *options {
				o := NewOptions(streams)
				o.fieldSelector = "f=field"

return o
			}(),
			func() *stern.Config {
				c := defaultConfig()
				sel, _ := fields.ParseSelector("f=field")
				c.FieldSelector = sel

return c
			}(),
			false,
		},
		{
			"node without fieldSelector",
			func() *options {
				o := NewOptions(streams)
				o.node = "node1"

return o
			}(),
			func() *stern.Config {
				c := defaultConfig()
				sel, _ := fields.ParseSelector("spec.nodeName=node1")
				c.FieldSelector = sel

return c
			}(),
			false,
		},
		{
			"timestamp=short",
			func() *options {
				o := NewOptions(streams)
				o.timestamps = "short"

return o
			}(),
			func() *stern.Config {
				c := defaultConfig()
				c.Timestamps = true
				c.TimestampFormat = stern.TimestampFormatShort

return c
			}(),
			false,
		},
		{
			"noFollow has the different default",
			func() *options {
				o := NewOptions(streams)
				o.noFollow = true // Follow = false

return o
			}(),
			func() *stern.Config {
				c := defaultConfig()
				c.Follow = false
				c.MaxLogRequests = 5 // default of noFollow

return c
			}(),
			false,
		},
		{
			"nil should be allowed",
			func() *options {
				o := NewOptions(streams)
				o.excludePod = nil
				o.excludeContainer = nil
				o.containerStates = nil
				o.namespaces = nil
				o.exclude = nil
				o.include = nil

return o
			}(),
			func() *stern.Config {
				c := defaultConfig()
				c.ContainerStates = []stern.ContainerState{}

return c
			}(),
			false,
		},
		{
			"error podQuery",
			func() *options {
				o := NewOptions(streams)
				o.podQuery = "[invalid"

return o
			}(),
			nil,
			true,
		},
		{
			"error excludePod",
			func() *options {
				o := NewOptions(streams)
				o.excludePod = []string{"exp1", "[invalid"}

return o
			}(),
			nil,
			true,
		},
		{
			"error container",
			func() *options {
				o := NewOptions(streams)
				o.container = "[invalid"

return o
			}(),
			nil,
			true,
		},
		{
			"error excludeContainer",
			func() *options {
				o := NewOptions(streams)
				o.excludeContainer = []string{"exc1", "[invalid"}

return o
			}(),
			nil,
			true,
		},
		{
			"error exclude",
			func() *options {
				o := NewOptions(streams)
				o.exclude = []string{"ex1", "[invalid"}

return o
			}(),
			nil,
			true,
		},
		{
			"error include",
			func() *options {
				o := NewOptions(streams)
				o.include = []string{"in1", "[invalid"}

return o
			}(),
			nil,
			true,
		},
		{
			"error containerStates",
			func() *options {
				o := NewOptions(streams)
				o.containerStates = []string{"running", "invalid"}

return o
			}(),
			nil,
			true,
		},
		{
			"error selector",
			func() *options {
				o := NewOptions(streams)
				o.selector = "-"

return o
			}(),
			nil,
			true,
		},
		{
			"error fieldSelector",
			func() *options {
				o := NewOptions(streams)
				o.fieldSelector = "-"

return o
			}(),
			nil,
			true,
		},
		{
			"error color",
			func() *options {
				o := NewOptions(streams)
				o.color = "invalid"

return o
			}(),
			nil,
			true,
		},
		{
			"error output",
			func() *options {
				o := NewOptions(streams)
				o.output = "invalid"

return o
			}(),
			nil,
			true,
		},
		{
			"error timezone",
			func() *options {
				o := NewOptions(streams)
				o.timezone = "invalid"

return o
			}(),
			nil,
			true,
		},
		{
			"error timestamps",
			func() *options {
				o := NewOptions(streams)
				o.timestamps = "invalid"

return o
			}(),
			nil,
			true,
		},
	}

for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := tt.o.sternConfig()
			if tt.wantError {
				if err == nil {
					t.Errorf("expected error, but got no error")
				}
				return
			}
			if err != nil {
				t.Errorf("unexpected error: %v", err)
				return
			}

// We skip the template as it is difficult to check
			// and is tested in TestOptionsGenerateTemplate().
			got.Template = nil

if !reflect.DeepEqual(tt.want, got) {
				t.Errorf("want %+v, but got %+v", tt.want, got)
			}
		})
	}
}

func TestOptionsOverrideFlagSetDefaultFromConfig(t *testing.T) {
	orig := defaultConfigFilePath
	defer func() {
		defaultConfigFilePath = orig
	}()

defaultConfigFilePath = "./config.yaml"
	wd, _ := os.Getwd()

tests := []struct {
		name                    string
		flagConfigFilePathValue string
		flagTailValue           string
		expectedTailValue       int64
		wantErr                 bool
	}{
		{
			name:                    "--config=testdata/config-tail1.yaml",
			flagConfigFilePathValue: filepath.Join(wd, "testdata/config-tail1.yaml"),
			expectedTailValue:       1,
			wantErr:                 false,
		},
		{
			name:                    "--config=testdata/config-empty.yaml",
			flagConfigFilePathValue: filepath.Join(wd, "testdata/config-empty.yaml"),
			expectedTailValue:       -1,
			wantErr:                 false,
		},
		{
			name:                    "--config=config-not-exist.yaml",
			flagConfigFilePathValue: filepath.Join(wd, "config-not-exist.yaml"),
			wantErr:                 true,
		},
		{
			name:                    "--config=config-invalid.yaml",
			flagConfigFilePathValue: filepath.Join(wd, "testdata/config-invalid.yaml"),
			wantErr:                 true,
		},
		{
			name:                    "--config=config-unknown-option.yaml",
			flagConfigFilePathValue: filepath.Join(wd, "testdata/config-unknown-option.yaml"),
			expectedTailValue:       1,
			wantErr:                 false,
		},
		{
			name:                    "--config=config-tail-invalid-value.yaml",
			flagConfigFilePathValue: filepath.Join(wd, "testdata/config-tail-invalid-value.yaml"),
			wantErr:                 true,
		},
		{
			name:              "config file path is not specified and config file does not exist",
			expectedTailValue: -1,
			wantErr:           false,
		},
		{
			name:                    "--config=testdata/config-tail1.yaml and --tail=2",
			flagConfigFilePathValue: filepath.Join(wd, "testdata/config-tail1.yaml"),
			flagTailValue:           "2",
			expectedTailValue:       2,
			wantErr:                 false,
		},
	}

for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			o := NewOptions(genericclioptions.NewTestIOStreamsDiscard())
			fs := pflag.NewFlagSet("", pflag.ExitOnError)
			o.AddFlags(fs)

args := []string{}
			if tt.flagConfigFilePathValue != "" {
				args = append(args, "--config="+tt.flagConfigFilePathValue)
			}
			if tt.flagTailValue != "" {
				args = append(args, "--tail="+tt.flagTailValue)
			}

if err := fs.Parse(args); err != nil {
				t.Fatal(err)
			}

err := o.overrideFlagSetDefaultFromConfig(fs)
			if tt.wantErr {
				if err == nil {
					t.Error("expected err, but got nil")
				}
				return
			}

if err != nil {
				t.Errorf("unexpected err: %v", err)
			}

if tt.expectedTailValue != o.tail {
				t.Errorf("expected %d for tail, but got %d", tt.expectedTailValue, o.tail)
			}
		})
	}
}
07070100000014000081A400000000000000000000000164388A3F000024AF000000000000000000000000000000000000002400000000stern-1.25.0/cmd/flag_completion.go//   Copyright 2017 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package cmd

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"strings"

"github.com/pkg/errors"
	"github.com/spf13/cobra"
	"github.com/stern/stern/kubernetes"
	"github.com/stern/stern/stern"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	clientset "k8s.io/client-go/kubernetes"
)

var flagChoices = map[string][]string{
	"color":           []string{"always", "never", "auto"},
	"completion":      []string{"bash", "zsh", "fish"},
	"container-state": []string{stern.RUNNING, stern.WAITING, stern.TERMINATED, stern.ALL_STATES},
	"output":          []string{"default", "raw", "json", "extjson", "ppextjson"},
	"timestamps":      []string{"default", "short"},
}

func runCompletion(shell string, cmd *cobra.Command, out io.Writer) error {
	var err error

switch shell {
	case "bash":
		err = cmd.GenBashCompletion(out)
	case "zsh":
		err = runCompletionZsh(cmd, out)
	case "fish":
		err = cmd.GenFishCompletion(out, true)
	default:
		err = fmt.Errorf("Unsupported shell type: %q", shell)
	}

return err
}

// runCompletionZsh is based on `kubectl completion zsh`. This function should
// be replaced by cobra implementation when cobra itself supports zsh completion.
// https://github.com/kubernetes/kubernetes/blob/v1.6.1/pkg/kubectl/cmd/completion.go#L136
func runCompletionZsh(cmd *cobra.Command, out io.Writer) error {
	b := new(bytes.Buffer)
	if err := cmd.GenZshCompletion(b); err != nil {
		return err
	}

// Cobra doesn't source zsh completion file, explicitly doing it here
	fmt.Fprintf(b, "compdef _stern stern")

fmt.Fprint(out, b.String())

return nil
}

func registerCompletionFuncForFlags(cmd *cobra.Command, o *options) error {
	if err := cmd.RegisterFlagCompletionFunc("namespace", namespaceCompletionFunc(o)); err != nil {
		return err
	}

if err := cmd.RegisterFlagCompletionFunc("node", nodeCompletionFunc(o)); err != nil {
		return err
	}

if err := cmd.RegisterFlagCompletionFunc("context", contextCompletionFunc(o)); err != nil {
		return err
	}

// flags with pre-defined choices
	for flag, choices := range flagChoices {
		if err := cmd.RegisterFlagCompletionFunc(flag,
			cobra.FixedCompletions(choices, cobra.ShellCompDirectiveNoFileComp)); err != nil {
			return err
		}
	}

return nil
}

// namespaceCompletionFunc is a completion function that completes namespaces
// that match the toComplete prefix.
func namespaceCompletionFunc(o *options) func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	return func(_ *cobra.Command, _ []string, toComplete string) ([]string, cobra.ShellCompDirective) {
		clientConfig := kubernetes.NewClientConfig(o.kubeConfig, o.context)
		clientset, err := kubernetes.NewClientSet(clientConfig)
		if err != nil {
			return compError(err)
		}

namespaceList, err := clientset.CoreV1().Namespaces().List(context.TODO(), metav1.ListOptions{})
		if err != nil {
			return compError(err)
		}

var comps []string
		for _, ns := range namespaceList.Items {
			if strings.HasPrefix(ns.GetName(), toComplete) {
				comps = append(comps, ns.GetName())
			}
		}

return comps, cobra.ShellCompDirectiveNoFileComp
	}
}

// nodeCompletionFunc is a completion function that completes node names
// that match the toComplete prefix.
func nodeCompletionFunc(o *options) func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	return func(_ *cobra.Command, _ []string, toComplete string) ([]string, cobra.ShellCompDirective) {
		clientConfig := kubernetes.NewClientConfig(o.kubeConfig, o.context)
		clientset, err := kubernetes.NewClientSet(clientConfig)
		if err != nil {
			return compError(err)
		}

nodeList, err := clientset.CoreV1().Nodes().List(context.TODO(), metav1.ListOptions{})
		if err != nil {
			return compError(err)
		}

var comps []string
		for _, node := range nodeList.Items {
			if strings.HasPrefix(node.GetName(), toComplete) {
				comps = append(comps, node.GetName())
			}
		}

return comps, cobra.ShellCompDirectiveNoFileComp
	}
}

// contextCompletionFunc is a completion function that completes contexts
// that match the toComplete prefix.
func contextCompletionFunc(o *options) func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	return func(_ *cobra.Command, _ []string, toComplete string) ([]string, cobra.ShellCompDirective) {
		clientConfig := kubernetes.NewClientConfig(o.kubeConfig, o.context)
		config, err := clientConfig.RawConfig()
		if err != nil {
			return compError(err)
		}

var comps []string
		for name := range config.Contexts {
			if strings.HasPrefix(name, toComplete) {
				comps = append(comps, name)
			}
		}

return comps, cobra.ShellCompDirectiveNoFileComp
	}
}

// queryCompletionFunc is a completion function that completes a resource
// that match the toComplete prefix.
func queryCompletionFunc(o *options) func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
	return func(_ *cobra.Command, _ []string, toComplete string) ([]string, cobra.ShellCompDirective) {
		var comps []string
		parts := strings.Split(toComplete, "/")
		if len(parts) != 2 {
			// list available resources in the form "<resource>/"
			for _, matcher := range stern.ResourceMatchers {
				if strings.HasPrefix(matcher.Name(), toComplete) {
					comps = append(comps, matcher.Name()+"/")
				}
			}
			return comps, cobra.ShellCompDirectiveNoFileComp | cobra.ShellCompDirectiveNoSpace
		}

// list available names in the resources in the form "<resource>/<name>"
		uniqueNamespaces := makeUnique(o.namespaces)
		if o.allNamespaces || len(uniqueNamespaces) > 1 {
			// do not support multiple namespaces for simplicity
			return compError(errors.New("multiple namespaces are not supported"))
		}

clientConfig := kubernetes.NewClientConfig(o.kubeConfig, o.context)
		clientset, err := kubernetes.NewClientSet(clientConfig)
		if err != nil {
			return compError(err)
		}
		var namespace string
		if len(uniqueNamespaces) == 1 {
			namespace = uniqueNamespaces[0]
		} else {
			n, _, err := clientConfig.Namespace()
			if err != nil {
				return compError(err)
			}
			namespace = n
		}

kind, name := parts[0], parts[1]
		names, err := retrieveNamesFromResource(context.TODO(), clientset, namespace, kind)
		if err != nil {
			return compError(err)
		}
		for _, n := range names {
			if strings.HasPrefix(n, name) {
				comps = append(comps, kind+"/"+n)
			}
		}
		return comps, cobra.ShellCompDirectiveNoFileComp
	}
}

func compError(err error) ([]string, cobra.ShellCompDirective) {
	cobra.CompError(err.Error())
	return nil, cobra.ShellCompDirectiveError
}

func retrieveNamesFromResource(ctx context.Context, client clientset.Interface, namespace, kind string) ([]string, error) {
	opt := metav1.ListOptions{}
	var names []string
	switch {
	// core
	case stern.PodMatcher.Matches(kind):
		l, err := client.CoreV1().Pods(namespace).List(ctx, opt)
		if err != nil {
			return nil, err
		}
		for _, item := range l.Items {
			names = append(names, item.GetName())
		}
	case stern.ReplicationControllerMatcher.Matches(kind):
		l, err := client.CoreV1().ReplicationControllers(namespace).List(ctx, opt)
		if err != nil {
			return nil, err
		}
		for _, item := range l.Items {
			names = append(names, item.GetName())
		}
	case stern.ServiceMatcher.Matches(kind):
		l, err := client.CoreV1().Services(namespace).List(ctx, opt)
		if err != nil {
			return nil, err
		}
		for _, item := range l.Items {
			names = append(names, item.GetName())
		}
	// apps
	case stern.DeploymentMatcher.Matches(kind):
		l, err := client.AppsV1().Deployments(namespace).List(ctx, opt)
		if err != nil {
			return nil, err
		}
		for _, item := range l.Items {
			names = append(names, item.GetName())
		}
	case stern.DaemonSetMatcher.Matches(kind):
		l, err := client.AppsV1().DaemonSets(namespace).List(ctx, opt)
		if err != nil {
			return nil, err
		}
		for _, item := range l.Items {
			names = append(names, item.GetName())
		}
	case stern.ReplicaSetMatcher.Matches(kind):
		l, err := client.AppsV1().ReplicaSets(namespace).List(ctx, opt)
		if err != nil {
			return nil, err
		}
		for _, item := range l.Items {
			names = append(names, item.GetName())
		}
	case stern.StatefulSetMatcher.Matches(kind):
		l, err := client.AppsV1().StatefulSets(namespace).List(ctx, opt)
		if err != nil {
			return nil, err
		}
		for _, item := range l.Items {
			names = append(names, item.GetName())
		}
	// batch
	case stern.JobMatcher.Matches(kind):
		l, err := client.BatchV1().Jobs(namespace).List(ctx, opt)
		if err != nil {
			return nil, err
		}
		for _, item := range l.Items {
			names = append(names, item.GetName())
		}
	default:
		return nil, fmt.Errorf("resource type %s is not supported", kind)
	}
	return names, nil
}
07070100000015000081A400000000000000000000000164388A3F00000CF3000000000000000000000000000000000000002900000000stern-1.25.0/cmd/flag_completion_test.gopackage cmd

import (
	"context"
	"reflect"
	"testing"

appsv1 "k8s.io/api/apps/v1"
	batchv1 "k8s.io/api/batch/v1"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/kubernetes/fake"
)

func TestRetrieveNamesFromResource(t *testing.T) {
	genMeta := func(name string) metav1.ObjectMeta {
		return metav1.ObjectMeta{
			Name:      name,
			Namespace: "ns1",
		}
	}
	objs := []runtime.Object{
		&corev1.Pod{ObjectMeta: genMeta("pod1")},
		&corev1.Pod{ObjectMeta: genMeta("pod2")},
		&corev1.Pod{ObjectMeta: genMeta("pod3")},
		&corev1.ReplicationController{ObjectMeta: genMeta("rc1")},
		&corev1.Service{ObjectMeta: genMeta("svc1")},
		&appsv1.Deployment{ObjectMeta: genMeta("deploy1")},
		&appsv1.Deployment{ObjectMeta: genMeta("deploy2")},
		&appsv1.DaemonSet{ObjectMeta: genMeta("ds1")},
		&appsv1.DaemonSet{ObjectMeta: genMeta("ds2")},
		&appsv1.ReplicaSet{ObjectMeta: genMeta("rs1")},
		&appsv1.ReplicaSet{ObjectMeta: genMeta("rs2")},
		&appsv1.StatefulSet{ObjectMeta: genMeta("sts1")},
		&appsv1.StatefulSet{ObjectMeta: genMeta("sts2")},
		&batchv1.Job{ObjectMeta: genMeta("job1")},
		&batchv1.Job{ObjectMeta: genMeta("job2")},
	}
	client := fake.NewSimpleClientset(objs...)
	tests := []struct {
		desc      string
		kinds     []string
		expected  []string
		wantError bool
	}{
		// core
		{
			desc:     "pods",
			kinds:    []string{"po", "pods", "pod"},
			expected: []string{"pod1", "pod2", "pod3"},
		},
		{
			desc:     "replicationcontrollers",
			kinds:    []string{"rc", "replicationcontrollers", "replicationcontroller"},
			expected: []string{"rc1"},
		},
		// apps
		{
			desc:     "deployments",
			kinds:    []string{"deploy", "deployments", "deployment"},
			expected: []string{"deploy1", "deploy2"},
		},
		{
			desc:     "daemonsets",
			kinds:    []string{"ds", "daemonsets", "daemonset"},
			expected: []string{"ds1", "ds2"},
		},
		{
			desc:     "replicasets",
			kinds:    []string{"rs", "replicasets", "replicaset"},
			expected: []string{"rs1", "rs2"},
		},
		{
			desc:     "statefulsets",
			kinds:    []string{"sts", "statefulsets", "statefulset"},
			expected: []string{"sts1", "sts2"},
		},
		// batch
		{
			desc:     "jobs",
			kinds:    []string{"job", "jobs"},
			expected: []string{"job1", "job2"},
		},
		// invalid
		{
			desc:      "invalid",
			kinds:     []string{"", "unknown"},
			wantError: true,
		},
	}

for _, tt := range tests {
		t.Run(tt.desc, func(t *testing.T) {
			for _, kind := range tt.kinds {
				names, err := retrieveNamesFromResource(context.Background(), client, "ns1", kind)
				if tt.wantError {
					if err == nil {
						t.Errorf("expected error, but got no error")
					}
					return
				}
				if err != nil {
					t.Errorf("unexpected error: %v", err)
					return
				}
				if !reflect.DeepEqual(tt.expected, names) {
					t.Errorf("expected %v, but actual %v", tt.expected, names)
				}
				// expect empty slice with no error when no objects are found in the valid resource
				names, err = retrieveNamesFromResource(context.Background(), client, "not-matched", kind)
				if err != nil {
					t.Errorf("unexpected error: %v", err)
					return
				}
				if len(names) != 0 {
					t.Errorf("expected empty slice, but got %v", names)
					return
				}
			}
		})
	}
}
07070100000016000081A400000000000000000000000164388A3F00000617000000000000000000000000000000000000002000000000stern-1.25.0/cmd/flag_prompt.gopackage cmd

import (
	"context"
	"fmt"
	"io"
	"sort"

"github.com/AlecAivazis/survey/v2"
	"github.com/fatih/color"
	"github.com/pkg/errors"
	"github.com/stern/stern/stern"
	"k8s.io/apimachinery/pkg/labels"
)

// promptHandler invokes the interactive prompt and updates config.LabelSelector with the selected value.
func promptHandler(ctx context.Context, config *stern.Config, out io.Writer) error {
	labelsMap, err := stern.List(ctx, config)
	if err != nil {
		return err
	}

if len(labelsMap) == 0 {
		return errors.New("No matching labels")
	}

var choices []string

for key := range labelsMap {
		choices = append(choices, key)
	}

sort.Strings(choices)

choice, err := selectPods(choices)
	if err != nil {
		return err
	}

selector := fmt.Sprintf("%v=%v", labelsMap[choice], choice)

fmt.Fprintf(out, "Selector: %v\n", color.BlueString(selector))

labelSelector, err := labels.Parse(selector)
	if err != nil {
		return err
	}

config.LabelSelector = labelSelector

return nil
}

// selectPods surfaces an interactive prompt for selecting an app.kubernetes.io/instance.
func selectPods(pods []string) (string, error) {
	arrow := survey.WithIcons(func(icons *survey.IconSet) {
		icons.Question.Text = "❯"
		icons.SelectFocus.Text = "❯"
		icons.Question.Format = "blue"
		icons.SelectFocus.Format = "blue"
	})

prompt := &survey.Select{
		Message: "Select \"app.kubernetes.io/instance\" label value:",
		Options: pods,
	}

var pod string

if err := survey.AskOne(prompt, &pod, arrow); err != nil {
		return "", err
	}

return pod, nil
}
07070100000017000081A400000000000000000000000164388A3F00000134000000000000000000000000000000000000002100000000stern-1.25.0/cmd/flag_version.gopackage cmd

import (
	"fmt"
	"io"
)

var (
	version = "dev"
	commit  = ""
	date    = ""
)

func outputVersionInfo(out io.Writer) {
	fmt.Fprintf(out, "version: %s\n", version)

if commit != "" {
		fmt.Fprintf(out, "commit: %s\n", commit)
	}

if date != "" {
		fmt.Fprintf(out, "built at: %s\n", date)
	}
}
07070100000018000081A400000000000000000000000164388A3F000000EE000000000000000000000000000000000000001A00000000stern-1.25.0/cmd/test.tpl{{color .PodColor .PodName}} {{color .ContainerColor .ContainerName}} {{ with $msg := .Message | tryParseJSON }}[{{ colorGreen (toRFC3339Nano (toUTC $msg.ts)) }}] {{ levelColor $msg.level }} {{ $msg.msg }}{{ else }}{{ .Message }}{{ end }}07070100000019000041ED00000000000000000000000264388A3F00000000000000000000000000000000000000000000001A00000000stern-1.25.0/cmd/testdata0707010000001A000081A400000000000000000000000164388A3F00000000000000000000000000000000000000000000002C00000000stern-1.25.0/cmd/testdata/config-empty.yaml0707010000001B000081A400000000000000000000000164388A3F0000001C000000000000000000000000000000000000002E00000000stern-1.25.0/cmd/testdata/config-invalid.yamlthis is invalid config file
0707010000001C000081A400000000000000000000000164388A3F0000000E000000000000000000000000000000000000003900000000stern-1.25.0/cmd/testdata/config-tail-invalid-value.yamltail: invalid
0707010000001D000081A400000000000000000000000164388A3F00000008000000000000000000000000000000000000002C00000000stern-1.25.0/cmd/testdata/config-tail1.yamltail: 1
0707010000001E000081A400000000000000000000000164388A3F00000015000000000000000000000000000000000000003500000000stern-1.25.0/cmd/testdata/config-unknown-option.yamlunknown: 999
tail: 1
0707010000001F000081A400000000000000000000000164388A3F00000C58000000000000000000000000000000000000001400000000stern-1.25.0/go.modmodule github.com/stern/stern

go 1.19

require (
	github.com/AlecAivazis/survey/v2 v2.3.6
	github.com/fatih/color v1.15.0
	github.com/mitchellh/go-homedir v1.1.0
	github.com/pkg/errors v0.9.1
	github.com/spf13/cast v1.5.0
	github.com/spf13/cobra v1.7.0
	github.com/spf13/pflag v1.0.5
	golang.org/x/sync v0.1.0
	golang.org/x/time v0.3.0
	gopkg.in/yaml.v3 v3.0.1
	k8s.io/api v0.27.0
	k8s.io/apimachinery v0.27.0
	k8s.io/cli-runtime v0.27.0
	k8s.io/client-go v0.27.0
	k8s.io/klog/v2 v2.90.1
	k8s.io/utils v0.0.0-20230406110748-d93618cff8a2
)

require (
	github.com/davecgh/go-spew v1.1.1 // indirect
	github.com/emicklei/go-restful/v3 v3.10.2 // indirect
	github.com/evanphx/json-patch v5.6.0+incompatible // indirect
	github.com/go-errors/errors v1.4.2 // indirect
	github.com/go-logr/logr v1.2.4 // indirect
	github.com/go-openapi/jsonpointer v0.19.6 // indirect
	github.com/go-openapi/jsonreference v0.20.2 // indirect
	github.com/go-openapi/swag v0.22.3 // indirect
	github.com/gogo/protobuf v1.3.2 // indirect
	github.com/golang/protobuf v1.5.3 // indirect
	github.com/google/btree v1.1.2 // indirect
	github.com/google/gnostic v0.6.9 // indirect
	github.com/google/go-cmp v0.5.9 // indirect
	github.com/google/gofuzz v1.2.0 // indirect
	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
	github.com/google/uuid v1.3.0 // indirect
	github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79 // indirect
	github.com/imdario/mergo v0.3.15 // indirect
	github.com/inconshreveable/mousetrap v1.1.0 // indirect
	github.com/josharian/intern v1.0.0 // indirect
	github.com/json-iterator/go v1.1.12 // indirect
	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
	github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de // indirect
	github.com/mailru/easyjson v0.7.7 // indirect
	github.com/mattn/go-colorable v0.1.13 // indirect
	github.com/mattn/go-isatty v0.0.18 // indirect
	github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d // indirect
	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
	github.com/modern-go/reflect2 v1.0.2 // indirect
	github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect
	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
	github.com/peterbourgon/diskv v2.0.1+incompatible // indirect
	github.com/xlab/treeprint v1.2.0 // indirect
	go.starlark.net v0.0.0-20230302034142-4b1e35fe2254 // indirect
	golang.org/x/net v0.9.0 // indirect
	golang.org/x/oauth2 v0.7.0 // indirect
	golang.org/x/sys v0.7.0 // indirect
	golang.org/x/term v0.7.0 // indirect
	golang.org/x/text v0.9.0 // indirect
	google.golang.org/appengine v1.6.7 // indirect
	google.golang.org/protobuf v1.30.0 // indirect
	gopkg.in/inf.v0 v0.9.1 // indirect
	gopkg.in/yaml.v2 v2.4.0 // indirect
	k8s.io/kube-openapi v0.0.0-20230327201221-f5883ff37f0c // indirect
	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
	sigs.k8s.io/kustomize/api v0.13.2 // indirect
	sigs.k8s.io/kustomize/kyaml v0.14.1 // indirect
	sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect
	sigs.k8s.io/yaml v1.3.0 // indirect
)
07070100000020000081A400000000000000000000000164388A3F00007DE1000000000000000000000000000000000000001400000000stern-1.25.0/go.sumcloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/AlecAivazis/survey/v2 v2.3.6 h1:NvTuVHISgTHEHeBFqt6BHOe4Ny/NwGZr7w+F8S9ziyw=
github.com/AlecAivazis/survey/v2 v2.3.6/go.mod h1:4AuI9b7RjAR+G7v9+C4YSlX/YL3K3cWNXgWXOhllqvI=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2 h1:+vx7roKuyA63nhn5WAunQHLTznkw5W8b1Xc0dNjp83s=
github.com/Netflix/go-expect v0.0.0-20220104043353-73e0943537d2/go.mod h1:HBCaDeC1lPdgDeDbhX8XFpy1jqjK0IBG8W5K+xYqA0w=
github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/creack/pty v1.1.17 h1:QeVUsEDNrLBW4tMgZHvxy18sKtr6VI492kBhUfhDJNI=
github.com/creack/pty v1.1.17/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
github.com/emicklei/go-restful/v3 v3.10.2 h1:hIovbnmBTLjHXkqEBUz3HGpXZdM7ZrE9fJIZIqlJLqE=
github.com/emicklei/go-restful/v3 v3.10.2/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0/go.mod h1:hliV/p42l8fGbc6Y9bQ70uLwIvmJyVE5k4iMKlh8wCQ=
github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
github.com/evanphx/json-patch v5.6.0+incompatible h1:jBYDEEiFBPxA0v50tFdvOzQQTCvpL6mnFh5mB2/l16U=
github.com/evanphx/json-patch v5.6.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk=
github.com/fatih/color v1.15.0 h1:kOqh6YHBtK8aywxGerMG2Eq3H6Qgoqeo13Bk2Mv/nBs=
github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBDUSsw=
github.com/flowstack/go-jsonschema v0.1.1/go.mod h1:yL7fNggx1o8rm9RlgXv7hTBWxdBM0rVwpMwimd3F3N0=
github.com/frankban/quicktest v1.14.3 h1:FJKSZTDHjyhriyC81FLQ0LY93eSai0ZyR/ZIkd3ZUKE=
github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
github.com/go-errors/errors v1.4.2 h1:J6MZopCL4uSllY1OfXM374weqZFFItUbrImctkmUxIA=
github.com/go-errors/errors v1.4.2/go.mod h1:sIVyrIiJhuEF+Pj9Ebtd6P/rEYROXFi3BopGUQ5a5Og=
github.com/go-logr/logr v1.2.0/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
github.com/go-logr/logr v1.2.4/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
github.com/go-openapi/jsonpointer v0.19.6 h1:eCs3fxoIi3Wh6vtgmLTOjdhSpiqphQ+DaPn38N2ZdrE=
github.com/go-openapi/jsonpointer v0.19.6/go.mod h1:osyAmYz/mB/C3I+WsTTSgw1ONzaLJoLCyoi6/zppojs=
github.com/go-openapi/jsonreference v0.20.2 h1:3sVjiK66+uXK/6oQ8xgcRKcFgQ5KXa2KvnJRumpMGbE=
github.com/go-openapi/jsonreference v0.20.2/go.mod h1:Bl1zwGIM8/wsvqjsOQLJ/SH+En5Ap4rVB5KVcIDZG2k=
github.com/go-openapi/swag v0.22.3 h1:yMBqmnQ0gyZvEb/+KzuWZOXgllrXT4SADYbvDaXHv/g=
github.com/go-openapi/swag v0.22.3/go.mod h1:UzaqsxGiab7freDnrUUra0MwWfN/q7tE4j+VcZ0yl14=
github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 h1:p104kn46Q8WdvHunIJ9dAyjPVtrBPhSr3KT2yUst43I=
github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
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k8s.io/api v0.27.0 h1:2owttiA8Oa+J3idFeq8TSnNpm4y6AOGPI3PDbIpp2cE=
k8s.io/api v0.27.0/go.mod h1:Wl+QRvQlh+T8SK5f4F6YBhhyH6hrFO08nl74xZb1MUE=
k8s.io/apimachinery v0.27.0 h1:vEyy/PVMbPMCPutrssCVHCf0JNZ0Px+YqPi82K2ALlk=
k8s.io/apimachinery v0.27.0/go.mod h1:5ikh59fK3AJ287GUvpUsryoMFtH9zj/ARfWCo3AyXTM=
k8s.io/cli-runtime v0.27.0 h1:kYVGqjmBbaj22nJ7je/3tigjiSlB04kVbjW+51zivu8=
k8s.io/cli-runtime v0.27.0/go.mod h1:kN+Q+5L37DFCdpNuCLTHO7w+dwlJb0xzn8jveB3bPSw=
k8s.io/client-go v0.27.0 h1:DyZS1fJkv73tEy7rWv4VF6NwGeJ7SKvNaLRXZBYLA+4=
k8s.io/client-go v0.27.0/go.mod h1:XVEmpNnM+4JYO3EENoFV/ZDv3KxKVJUnzGo70avk+C4=
k8s.io/klog/v2 v2.90.1 h1:m4bYOKall2MmOiRaR1J+We67Do7vm9KiQVlT96lnHUw=
k8s.io/klog/v2 v2.90.1/go.mod h1:y1WjHnz7Dj687irZUWR/WLkLc5N1YHtjLdmgWjndZn0=
k8s.io/kube-openapi v0.0.0-20230327201221-f5883ff37f0c h1:EFfsozyzZ/pggw5qNx7ftTVZdp7WZl+3ih89GEjYEK8=
k8s.io/kube-openapi v0.0.0-20230327201221-f5883ff37f0c/go.mod h1:byini6yhqGC14c3ebc/QwanvYwhuMWF6yz2F8uwW8eg=
k8s.io/utils v0.0.0-20230406110748-d93618cff8a2 h1:qY1Ad8PODbnymg2pRbkyMT/ylpTrCM8P2RJ0yroCyIk=
k8s.io/utils v0.0.0-20230406110748-d93618cff8a2/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo=
sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0=
sigs.k8s.io/kustomize/api v0.13.2 h1:kejWfLeJhUsTGioDoFNJET5LQe/ajzXhJGYoU+pJsiA=
sigs.k8s.io/kustomize/api v0.13.2/go.mod h1:DUp325VVMFVcQSq+ZxyDisA8wtldwHxLZbr1g94UHsw=
sigs.k8s.io/kustomize/kyaml v0.14.1 h1:c8iibius7l24G2wVAGZn/Va2wNys03GXLjYVIcFVxKA=
sigs.k8s.io/kustomize/kyaml v0.14.1/go.mod h1:AN1/IpawKilWD7V+YvQwRGUvuUOOWpjsHu6uHwonSF4=
sigs.k8s.io/structured-merge-diff/v4 v4.2.3 h1:PRbqxJClWWYMNV1dhaG4NsibJbArud9kFxnAMREiWFE=
sigs.k8s.io/structured-merge-diff/v4 v4.2.3/go.mod h1:qjx8mGObPmV2aSZepjQjbmb2ihdVs8cGKBraizNC69E=
sigs.k8s.io/yaml v1.3.0 h1:a2VclLzOGrwOHDiV8EfBGhvjHvP46CtW5j6POvhYGGo=
sigs.k8s.io/yaml v1.3.0/go.mod h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8=
07070100000021000041ED00000000000000000000000364388A3F00000000000000000000000000000000000000000000001200000000stern-1.25.0/hack07070100000022000041ED00000000000000000000000264388A3F00000000000000000000000000000000000000000000002000000000stern-1.25.0/hack/update-readme07070100000023000081A400000000000000000000000164388A3F000010D8000000000000000000000000000000000000003100000000stern-1.25.0/hack/update-readme/update-readme.gopackage main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"strings"

"github.com/spf13/pflag"
	"github.com/stern/stern/cmd"
	"k8s.io/cli-runtime/pkg/genericclioptions"
)

const (
	targetSectionBegin = ""
	targetSectionEnd   = ""
)

func main() {
	if len(os.Args) != 2 {
		fmt.Fprintln(os.Stderr, "readmePath argument required")
		os.Exit(1)
	}
	readmePath := os.Args[1]

flagsMarkdownTable := GenerateFlagsMarkdownTable()

readmeString, err := GenerateReadme(readmePath, flagsMarkdownTable)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}

err = OverwriteReadme(readmePath, readmeString)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}

// GenerateFlagsMarkdownTable generates markdown table of flag list.
// This function loads flag list and generates such as following text:
//
//	 flag            | default         | purpose
//	-----------------|-----------------|---------
//	 `--flag1`, `-f` |                 | This is flag1.
//	 `--flag2`       | `flag2-default` | This is flag2.
func GenerateFlagsMarkdownTable() string {
	fs := pflag.NewFlagSet("", pflag.ExitOnError)
	o := cmd.NewOptions(genericclioptions.NewTestIOStreamsDiscard())
	o.AddFlags(fs)

flagMaxlen, defaultMaxlen := len(" flag "), len(" default ")
	allTexts := make([][]string, 0)
	fs.VisitAll(func(flag *pflag.Flag) {
		// won't append deprecated flag
		if flag.Deprecated != "" {
			return
		}

flagText := ""
		if flag.Shorthand != "" {
			flagText = fmt.Sprintf(" `--%s`, `-%s` ", flag.Name, flag.Shorthand)
		} else {
			flagText = fmt.Sprintf(" `--%s` ", flag.Name)
		}
		if len(flagText) > flagMaxlen {
			flagMaxlen = len(flagText)
		}

flagTypeName, usage := pflag.UnquoteUsage(flag)
		defaultText := ""
		if flag.DefValue != "" {
			switch flagTypeName {
			// convert []string{"aaa", "bbb"} to "aaa,bbb"
			case "strings":
				stirngSlice, err := fs.GetStringSlice(flag.Name)
				if err != nil {
					panic(err)
				}

defaultValuesString := ""
				for _, s := range stirngSlice {
					defaultValuesString += fmt.Sprintf("%s,", s)
				}
				defaultValuesString = strings.TrimRight(defaultValuesString, ",")

if defaultValuesString != "" {
					defaultText += fmt.Sprintf(" `%s` ", defaultValuesString)
				}
			default:
				defaultText += fmt.Sprintf(" `%s` ", flag.DefValue)
			}
		}
		if len(defaultText) > defaultMaxlen {
			defaultMaxlen = len(defaultText)
		}

purposeText := fmt.Sprintf(" %s", usage)

allTexts = append(allTexts, []string{flagText, defaultText, purposeText})
	})

tableText := fmt.Sprintf(
		" flag %s| default %s| purpose\n",
		strings.Repeat(" ", flagMaxlen-len(" flag ")),
		strings.Repeat(" ", defaultMaxlen-len(" default ")))
	tableText += fmt.Sprintf(
		"%s|%s|%s\n",
		strings.Repeat("-", flagMaxlen),
		strings.Repeat("-", defaultMaxlen),
		strings.Repeat("-", len(" purpose ")))
	for _, text := range allTexts {
		tableText += text[0]
		tableText += strings.Repeat(" ", flagMaxlen-len(text[0]))
		tableText += "|" + text[1]
		tableText += strings.Repeat(" ", defaultMaxlen-len(text[1]))
		tableText += "|" + text[2]
		tableText += "\n"
	}

return tableText
}

// GenerateReadme generates README.md in which flags markdown table is embedded.
// Overwrite the section which specified as the target.
func GenerateReadme(readmePath, flagsMarkdownTable string) (string, error) {
	f, err := os.Open(readmePath)
	if err != nil {
		return "", err
	}
	defer f.Close()

buf, err := io.ReadAll(f)
	if err != nil {
		return "", err
	}

inTargetSection := false
	tableText := ""
	scanner := bufio.NewScanner(strings.NewReader(string(buf)))
	for scanner.Scan() {
		if !inTargetSection {
			tableText += scanner.Text() + "\n"
		}

if scanner.Text() == targetSectionBegin {
			inTargetSection = true
		}

if scanner.Text() == targetSectionEnd {
			tableText += flagsMarkdownTable
			tableText += scanner.Text() + "\n"
			inTargetSection = false
		}
	}

return tableText, nil
}

// OverwriteReadme overwrites README.md with passed readmeString.
func OverwriteReadme(readmePath, readmeString string) error {
	f, err := os.Create(readmePath)
	if err != nil {
		return err
	}
	defer f.Close()

_, err = f.WriteString(readmeString)
	if err != nil {
		return err
	}

return nil
}
07070100000024000081ED00000000000000000000000164388A3F000001D3000000000000000000000000000000000000002300000000stern-1.25.0/hack/verify-readme.sh#!/usr/bin/env bash

set -eo pipefail; [[ -n "$DEBUG" ]] && set -ux

ROOT_DIR="$(cd "$(dirname $0)" && pwd)/.."
cd "$ROOT_DIR"

tempfile="$(mktemp)"
cat README.md >"$tempfile"
make update-readme README_FILE="$tempfile" >/dev/null
diff="$(diff -u ./README.md "$tempfile" ||:)"

if [[ -n "$diff" ]]; then
  echo "$diff" >&2
  echo "Error: Running update-readme made a difference in README.md." >&2
  echo "Maybe you forgot to run 'make update-readme'." >&2
  exit 1
fi
07070100000025000041ED00000000000000000000000264388A3F00000000000000000000000000000000000000000000001800000000stern-1.25.0/kubernetes07070100000026000081A400000000000000000000000164388A3F00000754000000000000000000000000000000000000002500000000stern-1.25.0/kubernetes/clientset.go//   Copyright 2016 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package kubernetes

import (
	"path/filepath"

"github.com/pkg/errors"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/tools/clientcmd"

// load all auth plugins
	_ "k8s.io/client-go/plugin/pkg/client/auth"
)

// NewClientConfig returns a new Kubernetes client config set for a context
func NewClientConfig(configPath string, contextName string) clientcmd.ClientConfig {
	configLoadingRules := clientcmd.NewDefaultClientConfigLoadingRules()

if configPath != "" {
		configPathList := filepath.SplitList(configPath)
		if len(configPathList) <= 1 {
			configLoadingRules.ExplicitPath = configPath
		} else {
			configLoadingRules.Precedence = configPathList
		}
	}

return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
		configLoadingRules,
		&clientcmd.ConfigOverrides{
			CurrentContext: contextName,
		},
	)
}

// NewClientSet returns a new Kubernetes client for a client config
func NewClientSet(clientConfig clientcmd.ClientConfig) (*kubernetes.Clientset, error) {
	c, err := clientConfig.ClientConfig()

if err != nil {
		return nil, errors.Wrap(err, "failed to get client config")
	}

clientset, err := kubernetes.NewForConfig(c)
	if err != nil {
		return nil, errors.Wrap(err, "failed to create clientset")
	}

return clientset, nil
}
07070100000027000081A400000000000000000000000164388A3F000003BC000000000000000000000000000000000000001500000000stern-1.25.0/main.go//   Copyright 2016 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package main

import (
	"log"
	"os"

"github.com/stern/stern/cmd"
	"k8s.io/cli-runtime/pkg/genericclioptions"
)

func main() {
	streams := genericclioptions.IOStreams{Out: os.Stdout, ErrOut: os.Stderr}
	stern, err := cmd.NewSternCmd(streams)
	if err != nil {
		log.Fatal(err)
	}

if err := stern.Execute(); err != nil {
		os.Exit(1)
	}
}
07070100000028000041ED00000000000000000000000264388A3F00000000000000000000000000000000000000000000001300000000stern-1.25.0/stern07070100000029000081A400000000000000000000000164388A3F000006A5000000000000000000000000000000000000001D00000000stern-1.25.0/stern/config.go//   Copyright 2016 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package stern

import (
	"io"
	"regexp"
	"text/template"
	"time"

"k8s.io/apimachinery/pkg/fields"
	"k8s.io/apimachinery/pkg/labels"
)

// Config contains the config for stern
type Config struct {
	KubeConfig            string
	ContextName           string
	Namespaces            []string
	PodQuery              *regexp.Regexp
	ExcludePodQuery       []*regexp.Regexp
	Timestamps            bool
	TimestampFormat       string
	Location              *time.Location
	ContainerQuery        *regexp.Regexp
	ExcludeContainerQuery []*regexp.Regexp
	ContainerStates       []ContainerState
	Exclude               []*regexp.Regexp
	Include               []*regexp.Regexp
	InitContainers        bool
	EphemeralContainers   bool
	Since                 time.Duration
	AllNamespaces         bool
	LabelSelector         labels.Selector
	FieldSelector         fields.Selector
	TailLines             *int64
	Template              *template.Template
	Follow                bool
	Resource              string
	OnlyLogLines          bool
	MaxLogRequests        int

Out    io.Writer
	ErrOut io.Writer
}
0707010000002A000081A400000000000000000000000164388A3F0000067C000000000000000000000000000000000000002600000000stern-1.25.0/stern/container_state.go//   Copyright 2016 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package stern

import (
	"errors"

v1 "k8s.io/api/core/v1"
)

type ContainerState string

const (
	RUNNING    = "running"
	WAITING    = "waiting"
	TERMINATED = "terminated"
	ALL_STATES = "all"
)

// NewContainerState returns corresponding ContainerState
func NewContainerState(stateConfig string) (ContainerState, error) {
	if stateConfig == RUNNING {
		return RUNNING, nil
	} else if stateConfig == WAITING {
		return WAITING, nil
	} else if stateConfig == TERMINATED {
		return TERMINATED, nil
	} else if stateConfig == ALL_STATES {
		return ALL_STATES, nil
	}

return "", errors.New("containerState should be one of 'running', 'waiting', 'terminated', or 'all'")
}

// Match returns ContainerState is matched
func (stateConfig ContainerState) Match(containerState v1.ContainerState) bool {
	if stateConfig == ALL_STATES {
		return true
	}
	return (stateConfig == RUNNING && containerState.Running != nil) ||
		(stateConfig == WAITING && containerState.Waiting != nil) ||
		(stateConfig == TERMINATED && containerState.Terminated != nil)
}
0707010000002B000081A400000000000000000000000164388A3F000007DC000000000000000000000000000000000000002B00000000stern-1.25.0/stern/container_state_test.gopackage stern

import (
	"testing"

v1 "k8s.io/api/core/v1"
)

func TestNewContainerState(t *testing.T) {
	tests := []struct {
		stateConfig string
		expected    ContainerState
		isError     bool
	}{
		{
			"running",
			ContainerState(RUNNING),
			false,
		},
		{
			"waiting",
			ContainerState(WAITING),
			false,
		},
		{
			"terminated",
			ContainerState(TERMINATED),
			false,
		},
		{
			"all",
			ContainerState(ALL_STATES),
			false,
		},
		{
			"wrongValue",
			ContainerState(""),
			true,
		},
	}

for i, tt := range tests {
		containerState, err := NewContainerState(tt.stateConfig)

if tt.expected != containerState {
			t.Errorf("%d: expected %v, but actual %v", i, tt.expected, containerState)
		}

if (tt.isError && err == nil) || (!tt.isError && err != nil) {
			t.Errorf("%d: expected error is %v, but actual %v", i, tt.isError, err)
		}
	}
}

func TestMatch(t *testing.T) {
	tests := []struct {
		containerState   ContainerState
		v1ContainerState v1.ContainerState
		expected         bool
	}{
		{
			ContainerState(RUNNING),
			v1.ContainerState{
				Running:    &v1.ContainerStateRunning{},
				Waiting:    nil,
				Terminated: nil,
			},
			true,
		},
		{
			ContainerState(WAITING),
			v1.ContainerState{
				Running:    nil,
				Waiting:    &v1.ContainerStateWaiting{},
				Terminated: nil,
			},
			true,
		},
		{
			ContainerState(TERMINATED),
			v1.ContainerState{
				Running:    nil,
				Waiting:    nil,
				Terminated: &v1.ContainerStateTerminated{},
			},
			true,
		},
		{
			// "all" always matches all containers regardless of their states
			ContainerState(ALL_STATES),
			v1.ContainerState{},
			true,
		},
		{
			ContainerState(RUNNING),
			v1.ContainerState{
				Running:    nil,
				Waiting:    &v1.ContainerStateWaiting{},
				Terminated: nil,
			},
			false,
		},
	}

for i, tt := range tests {
		actual := tt.containerState.Match(tt.v1ContainerState)

if tt.expected != actual {
			t.Errorf("%d: expected %v, but actual %v", i, tt.expected, actual)
		}
	}
}
0707010000002C000081A400000000000000000000000164388A3F00000B31000000000000000000000000000000000000001B00000000stern-1.25.0/stern/list.go//   Copyright 2016 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package stern

import (
	"context"
	"sync"

"github.com/pkg/errors"
	"github.com/stern/stern/kubernetes"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/fields"
	"k8s.io/apimachinery/pkg/labels"
	corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
)

// List returns a map of all 'app.kubernetes.io/instance' values.
func List(ctx context.Context, config *Config) (map[string]string, error) {
	clientConfig := kubernetes.NewClientConfig(config.KubeConfig, config.ContextName)
	cc, err := clientConfig.ClientConfig()
	if err != nil {
		return nil, err
	}

clientset, err := corev1client.NewForConfig(cc)
	if err != nil {
		return nil, err
	}

var namespaces []string
	// A specific namespace is ignored if all-namespaces is provided.
	if config.AllNamespaces {
		namespaces = []string{""}
	} else {
		namespaces = config.Namespaces
		if len(namespaces) == 0 {
			n, _, err := clientConfig.Namespace()
			if err != nil {
				return nil, errors.Wrap(err, "unable to get default namespace")
			}
			namespaces = []string{n}
		}
	}

labels := make(map[string]string)
	options := metav1.ListOptions{}

wg := sync.WaitGroup{}

wg.Add(len(namespaces))

// Concurrently iterate through provided namespaces.
	for _, n := range namespaces {
		go func(n string) {
			defer wg.Done()

pods, err := clientset.Pods(n).List(ctx, options)
			if err != nil {
				return
			}

match := "app.kubernetes.io/instance"
			// Iterate through pods in namespace, looking for matching labels.
			for _, pod := range pods.Items {
				key := pod.Labels[match]

if key == "" {
					continue
				}

labels[key] = match
			}
		}(n)
	}

wg.Wait()

return labels, nil
}

// ListTargets returns targets by listing and filtering pods
func ListTargets(ctx context.Context, i corev1client.PodInterface, labelSelector labels.Selector, fieldSelector fields.Selector, filter *targetFilter) ([]*Target, error) {
	list, err := i.List(ctx, metav1.ListOptions{LabelSelector: labelSelector.String(), FieldSelector: fieldSelector.String()})
	if err != nil {
		return nil, err
	}
	var targets []*Target
	for i := range list.Items {
		filter.visit(&list.Items[i], func(t *Target) {
			targets = append(targets, t)
		})
	}
	return targets, nil
}
0707010000002D000081A400000000000000000000000164388A3F00000986000000000000000000000000000000000000002700000000stern-1.25.0/stern/resource_matcher.go//   Copyright 2017 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package stern

// ResourceMatcher is a matcher for Kubernetes resources
type ResourceMatcher struct {
	name    string   // the resource name in singular e.g. "deployment"
	aliases []string // the aliases of the resource e.g. "deploy" and "deployments"
}

// Name returns the resource name in singular
func (r *ResourceMatcher) Name() string {
	return r.name
}

// AllNames returns the resource names including the aliases
func (r *ResourceMatcher) AllNames() []string {
	return append(r.aliases, r.name)
}

// Matches returns if name matches one of the resource names
func (r *ResourceMatcher) Matches(name string) bool {
	for _, n := range r.AllNames() {
		if n == name {
			return true
		}
	}
	return false
}

var (
	PodMatcher                   = ResourceMatcher{name: "pod", aliases: []string{"po", "pods"}}
	ReplicationControllerMatcher = ResourceMatcher{name: "replicationcontroller", aliases: []string{"rc", "replicationcontrollers"}}
	ServiceMatcher               = ResourceMatcher{name: "service", aliases: []string{"svc", "services"}}
	DaemonSetMatcher             = ResourceMatcher{name: "daemonset", aliases: []string{"ds", "daemonsets"}}
	DeploymentMatcher            = ResourceMatcher{name: "deployment", aliases: []string{"deploy", "deployments"}}
	ReplicaSetMatcher            = ResourceMatcher{name: "replicaset", aliases: []string{"rs", "replicasets"}}
	StatefulSetMatcher           = ResourceMatcher{name: "statefulset", aliases: []string{"sts", "statefulsets"}}
	JobMatcher                   = ResourceMatcher{name: "job", aliases: []string{"jobs"}} // job does not have a short name
	ResourceMatchers             = []ResourceMatcher{
		PodMatcher,
		ReplicationControllerMatcher,
		ServiceMatcher,
		DeploymentMatcher,
		DaemonSetMatcher,
		ReplicaSetMatcher,
		StatefulSetMatcher,
		JobMatcher,
	}
)
0707010000002E000081A400000000000000000000000164388A3F000020B9000000000000000000000000000000000000001C00000000stern-1.25.0/stern/stern.go//   Copyright 2016 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package stern

import (
	"context"
	"fmt"
	"regexp"
	"strings"
	"time"

"sync/atomic"

"github.com/pkg/errors"

"github.com/stern/stern/kubernetes"
	"golang.org/x/sync/errgroup"
	"golang.org/x/time/rate"

"k8s.io/apimachinery/pkg/labels"
	"k8s.io/utils/pointer"

metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	clientset "k8s.io/client-go/kubernetes"
)

// Run starts the main run loop
func Run(ctx context.Context, config *Config) error {
	clientConfig := kubernetes.NewClientConfig(config.KubeConfig, config.ContextName)
	cc, err := clientConfig.ClientConfig()
	if err != nil {
		return err
	}

client, err := clientset.NewForConfig(cc)
	if err != nil {
		return err
	}

var namespaces []string
	// A specific namespace is ignored if all-namespaces is provided
	if config.AllNamespaces {
		namespaces = []string{""}
	} else {
		namespaces = config.Namespaces
		if len(namespaces) == 0 {
			n, _, err := clientConfig.Namespace()
			if err != nil {
				return errors.Wrap(err, "unable to get default namespace")
			}
			namespaces = []string{n}
		}
	}

var resource struct {
		kind string
		name string
	}
	if config.Resource != "" {
		parts := strings.Split(config.Resource, "/")
		if len(parts) != 2 {
			return errors.New("resource must be specified in the form \"<resource>/<name>\"")
		}
		resource.kind, resource.name = parts[0], parts[1]
		if PodMatcher.Matches(resource.kind) {
			// Pods might have no labels or share the same labels,
			// so we use an exact match instead.
			podName, err := regexp.Compile("^" + resource.name + "$")
			if err != nil {
				return errors.Wrap(err, "failed to compile regular expression for pod")
			}
			config.PodQuery = podName
		}
	}

filter := newTargetFilter(targetFilterConfig{
		podFilter:              config.PodQuery,
		excludePodFilter:       config.ExcludePodQuery,
		containerFilter:        config.ContainerQuery,
		containerExcludeFilter: config.ExcludeContainerQuery,
		initContainers:         config.InitContainers,
		ephemeralContainers:    config.EphemeralContainers,
		containerStates:        config.ContainerStates,
	})
	newTail := func(t *Target) *Tail {
		return NewTail(client.CoreV1(), t.Node, t.Namespace, t.Pod, t.Container, config.Template, config.Out, config.ErrOut, &TailOptions{
			Timestamps:      config.Timestamps,
			TimestampFormat: config.TimestampFormat,
			Location:        config.Location,
			SinceSeconds:    pointer.Int64(int64(config.Since.Seconds())),
			Exclude:         config.Exclude,
			Include:         config.Include,
			Namespace:       config.AllNamespaces || len(namespaces) > 1,
			TailLines:       config.TailLines,
			Follow:          config.Follow,
			OnlyLogLines:    config.OnlyLogLines,
		})
	}

if !config.Follow {
		var eg errgroup.Group
		eg.SetLimit(config.MaxLogRequests)
		for _, n := range namespaces {
			selector, err := chooseSelector(ctx, client, n, resource.kind, resource.name, config.LabelSelector)
			if err != nil {
				return err
			}
			targets, err := ListTargets(ctx,
				client.CoreV1().Pods(n),
				selector,
				config.FieldSelector,
				filter,
			)
			if err != nil {
				return err
			}
			for _, t := range targets {
				t := t
				eg.Go(func() error {
					tail := newTail(t)
					defer tail.Close()
					return tail.Start(ctx)
				})
			}
		}
		return eg.Wait()
	}

tailTarget := func(ctx context.Context, target *Target) {
		// We use a rate limiter to prevent a burst of retries.
		// It also enables us to retry immediately, in most cases,
		// when it is disconnected on the way.
		limiter := rate.NewLimiter(rate.Every(time.Second*20), 2)
		var resumeRequest *ResumeRequest
		for {
			if err := limiter.Wait(ctx); err != nil {
				fmt.Fprintf(config.ErrOut, "failed to retry: %v\n", err)
				return
			}
			tail := newTail(target)
			var err error
			if resumeRequest == nil {
				err = tail.Start(ctx)
			} else {
				err = tail.Resume(ctx, resumeRequest)
			}
			tail.Close()
			if err == nil {
				return
			}
			if !filter.isActive(target) {
				fmt.Fprintf(config.ErrOut, "failed to tail: %v\n", err)
				return
			}
			fmt.Fprintf(config.ErrOut, "failed to tail: %v, will retry\n", err)
			if resumeReq := tail.GetResumeRequest(); resumeReq != nil {
				resumeRequest = resumeReq
			}
		}
	}

var numRequests atomic.Int64
	errCh := make(chan error)
	defer close(errCh)
	for _, n := range namespaces {
		selector, err := chooseSelector(ctx, client, n, resource.kind, resource.name, config.LabelSelector)
		if err != nil {
			return err
		}
		a, err := WatchTargets(ctx,
			client.CoreV1().Pods(n),
			selector,
			config.FieldSelector,
			filter,
		)
		if err != nil {
			return errors.Wrap(err, "failed to set up watch")
		}

go func() {
			for {
				select {
				case target, ok := <-a:
					if !ok {
						errCh <- fmt.Errorf("lost watch connection")
						return
					}
					numRequests.Add(1)
					if numRequests.Load() > int64(config.MaxLogRequests) {
						errCh <- fmt.Errorf(
							"stern reached the maximum number of log requests (%d),"+
								" use --max-log-requests to increase the limit",
							config.MaxLogRequests)
						return
					}
					go func() {
						tailTarget(ctx, target)
						numRequests.Add(-1)
					}()
				case <-ctx.Done():
					return
				}
			}
		}()
	}

select {
	case e := <-errCh:
		return e
	case <-ctx.Done():
		return nil
	}
}

func chooseSelector(ctx context.Context, client clientset.Interface, namespace, kind, name string, selector labels.Selector) (labels.Selector, error) {
	if kind == "" {
		return selector, nil
	}
	if PodMatcher.Matches(kind) {
		// We use an exact match for pods instead of a label to select pods without labels.
		return labels.Everything(), nil
	}
	labelMap, err := retrieveLabelsFromResource(ctx, client, namespace, kind, name)
	if err != nil {
		return nil, err
	}
	if len(labelMap) == 0 {
		return nil, fmt.Errorf("resource %s/%s has no labels to select", kind, name)
	}
	return labels.SelectorFromSet(labelMap), nil
}

func retrieveLabelsFromResource(ctx context.Context, client clientset.Interface, namespace, kind, name string) (map[string]string, error) {
	opt := metav1.GetOptions{}
	switch {
	// core
	case ReplicationControllerMatcher.Matches(kind):
		o, err := client.CoreV1().ReplicationControllers(namespace).Get(ctx, name, opt)
		if err != nil {
			return nil, err
		}
		if o.Spec.Template == nil { // RC's spec.template is a pointer field
			return nil, fmt.Errorf("%s does not have spec.template", name)
		}
		return o.Spec.Template.Labels, nil
	case ServiceMatcher.Matches(kind):
		o, err := client.CoreV1().Services(namespace).Get(ctx, name, opt)
		if err != nil {
			return nil, err
		}
		return o.Spec.Selector, nil
	// apps
	case DaemonSetMatcher.Matches(kind):
		o, err := client.AppsV1().DaemonSets(namespace).Get(ctx, name, opt)
		if err != nil {
			return nil, err
		}
		return o.Spec.Template.Labels, nil
	case DeploymentMatcher.Matches(kind):
		o, err := client.AppsV1().Deployments(namespace).Get(ctx, name, opt)
		if err != nil {
			return nil, err
		}
		return o.Spec.Template.Labels, nil
	case ReplicaSetMatcher.Matches(kind):
		o, err := client.AppsV1().ReplicaSets(namespace).Get(ctx, name, opt)
		if err != nil {
			return nil, err
		}
		return o.Spec.Template.Labels, nil
	case StatefulSetMatcher.Matches(kind):
		o, err := client.AppsV1().StatefulSets(namespace).Get(ctx, name, opt)
		if err != nil {
			return nil, err
		}
		return o.Spec.Template.Labels, nil
	// batch
	// We do not support cronjobs because they might not have labels to select.
	case JobMatcher.Matches(kind):
		o, err := client.BatchV1().Jobs(namespace).Get(ctx, name, opt)
		if err != nil {
			return nil, err
		}
		return o.Spec.Template.Labels, nil
	}
	return nil, fmt.Errorf("resource type %s is not supported", kind)
}
0707010000002F000081A400000000000000000000000164388A3F0000104F000000000000000000000000000000000000002100000000stern-1.25.0/stern/stern_test.gopackage stern

import (
	"context"
	"reflect"
	"testing"

appsv1 "k8s.io/api/apps/v1"
	batchv1 "k8s.io/api/batch/v1"
	corev1 "k8s.io/api/core/v1"

kerrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/kubernetes/fake"
)

func TestRetrieveLabelsFromResource(t *testing.T) {
	genMeta := func(name string) metav1.ObjectMeta {
		return metav1.ObjectMeta{
			Name:      name,
			Namespace: "ns1",
		}
	}
	genPodTemplateSpec := func(name string) corev1.PodTemplateSpec {
		return corev1.PodTemplateSpec{
			ObjectMeta: metav1.ObjectMeta{
				Labels: map[string]string{
					"app": name,
				},
			},
		}
	}
	objs := []runtime.Object{
		// core
		&corev1.ReplicationController{
			ObjectMeta: genMeta("rc1"),
			Spec: corev1.ReplicationControllerSpec{
				Template: &corev1.PodTemplateSpec{
					ObjectMeta: metav1.ObjectMeta{
						Labels: map[string]string{
							"app": "rc-label",
						},
					},
				},
			},
		},
		&corev1.Service{
			ObjectMeta: genMeta("svc1"),
			Spec: corev1.ServiceSpec{
				Selector: map[string]string{
					"app": "svc-label",
				},
			},
		},
		// apps
		&appsv1.DaemonSet{
			ObjectMeta: genMeta("ds1"),
			Spec: appsv1.DaemonSetSpec{
				Template: genPodTemplateSpec("ds-label"),
			},
		},
		&appsv1.Deployment{
			ObjectMeta: genMeta("deploy1"),
			Spec: appsv1.DeploymentSpec{
				Template: genPodTemplateSpec("deploy-label"),
			},
		},
		&appsv1.ReplicaSet{
			ObjectMeta: genMeta("rs1"),
			Spec: appsv1.ReplicaSetSpec{
				Template: genPodTemplateSpec("rs-label"),
			},
		},
		&appsv1.StatefulSet{
			ObjectMeta: genMeta("sts1"),
			Spec: appsv1.StatefulSetSpec{
				Template: genPodTemplateSpec("sts-label"),
			},
		},
		// batch
		&batchv1.Job{
			ObjectMeta: genMeta("job1"),
			Spec: batchv1.JobSpec{
				Template: genPodTemplateSpec("job-label"),
			},
		},
		&batchv1.CronJob{
			ObjectMeta: genMeta("cj1"),
			Spec: batchv1.CronJobSpec{
				JobTemplate: batchv1.JobTemplateSpec{
					Spec: batchv1.JobSpec{
						Template: genPodTemplateSpec("cj-label"),
					},
				},
			},
		},
	}
	client := fake.NewSimpleClientset(objs...)
	tests := []struct {
		desc      string
		kinds     []string
		name      string
		label     string
		wantError bool
	}{
		// core
		{
			desc:  "replicationcontrollers",
			kinds: []string{"rc", "replicationcontrollers", "replicationcontroller"},
			name:  "rc1",
			label: "rc-label",
		},
		{
			desc:  "services",
			kinds: []string{"svc", "services", "service"},
			name:  "svc1",
			label: "svc-label",
		},
		// apps
		{
			desc:  "daemonsets",
			kinds: []string{"ds", "daemonsets", "daemonset"},
			name:  "ds1",
			label: "ds-label",
		},
		{
			desc:  "deployments",
			kinds: []string{"deploy", "deployments", "deployment"},
			name:  "deploy1",
			label: "deploy-label",
		},
		{
			desc:  "replicasets",
			kinds: []string{"rs", "replicasets", "replicaset"},
			name:  "rs1",
			label: "rs-label",
		},
		{
			desc:  "statefulsets",
			kinds: []string{"sts", "statefulsets", "statefulset"},
			name:  "sts1",
			label: "sts-label",
		},
		// batch
		{
			desc:  "jobs",
			kinds: []string{"job", "jobs"},
			name:  "job1",
			label: "job-label",
		},
		// invalid
		{
			desc:      "invalid",
			kinds:     []string{"", "unknown"},
			name:      "dummy",
			wantError: true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.desc, func(t *testing.T) {
			for _, kind := range tt.kinds {
				labels, err := retrieveLabelsFromResource(context.Background(), client, "ns1", kind, tt.name)
				if tt.wantError {
					if err == nil {
						t.Errorf("expected error, but got no error")
					}
					return
				}
				if err != nil {
					t.Errorf("unexpected error: %v", err)
					return
				}
				expectedLabels := map[string]string{"app": tt.label}
				if !reflect.DeepEqual(expectedLabels, labels) {
					t.Errorf("expected %v, but actual %v", expectedLabels, labels)
				}

// test not found
				_, err = retrieveLabelsFromResource(context.Background(), client, "ns1", kind, "not-found")
				if !kerrors.IsNotFound(err) {
					t.Errorf("expected not found, but actual %v", err)
				}
			}
		})
	}
}
07070100000030000081A400000000000000000000000164388A3F00002946000000000000000000000000000000000000001B00000000stern-1.25.0/stern/tail.go//   Copyright 2016 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package stern

import (
	"bufio"
	"bytes"
	"context"
	"errors"
	"fmt"
	"hash/fnv"
	"io"
	"regexp"
	"sort"
	"strings"
	"text/template"
	"time"
	"unicode"

"github.com/fatih/color"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
	"k8s.io/client-go/rest"
)

// RFC3339Nano with trailing zeros
const TimestampFormatDefault = "2006-01-02T15:04:05.000000000Z07:00"

// time.DateTime without year
const TimestampFormatShort = "01-02 15:04:05"

type Tail struct {
	clientset corev1client.CoreV1Interface

NodeName       string
	Namespace      string
	PodName        string
	ContainerName  string
	Options        *TailOptions
	closed         chan struct{}
	podColor       *color.Color
	containerColor *color.Color
	tmpl           *template.Template
	last           struct {
		timestamp string // RFC3339 timestamp (not RFC3339Nano)
		lines     int    // the number of lines seen during this timestamp
	}
	resumeRequest *ResumeRequest
	out           io.Writer
	errOut        io.Writer
}

type TailOptions struct {
	Timestamps      bool
	TimestampFormat string
	Location        *time.Location

SinceSeconds *int64
	SinceTime    *metav1.Time
	Exclude      []*regexp.Regexp
	Include      []*regexp.Regexp
	Namespace    bool
	TailLines    *int64
	Follow       bool
	OnlyLogLines bool

// regexp for highlighting the matched string
	reHightlight *regexp.Regexp
}

type ResumeRequest struct {
	Timestamp   string // RFC3339 timestamp (not RFC3339Nano)
	LinesToSkip int    // the number of lines to skip during this timestamp
}

func (o TailOptions) IsExclude(msg string) bool {
	for _, rex := range o.Exclude {
		if rex.MatchString(msg) {
			return true
		}
	}

return false
}

func (o TailOptions) IsInclude(msg string) bool {
	if len(o.Include) == 0 {
		return true
	}

for _, rin := range o.Include {
		if rin.MatchString(msg) {
			return true
		}
	}

return false
}

var colorHighlight = color.New(color.FgRed, color.Bold).SprintFunc()

func (o TailOptions) HighlightMatchedString(msg string) string {
	if len(o.Include) == 0 {
		return msg
	}

if o.reHightlight == nil {
		ss := make([]string, len(o.Include))
		for i, rin := range o.Include {
			ss[i] = rin.String()
		}

// We expect a longer match
		sort.Slice(ss, func(i, j int) bool {
			return len(ss[i]) > len(ss[j])
		})

o.reHightlight = regexp.MustCompile("(" + strings.Join(ss, "|") + ")")
	}

msg = o.reHightlight.ReplaceAllStringFunc(msg, func(part string) string {
		return colorHighlight(part)
	})

return msg
}

func (o TailOptions) UpdateTimezoneAndFormat(timestamp string) (string, error) {
	t, err := time.ParseInLocation(time.RFC3339Nano, timestamp, time.UTC)
	if err != nil {
		return "", errors.New("missing timestamp")
	}
	format := TimestampFormatDefault
	if o.TimestampFormat != "" {
		format = o.TimestampFormat
	}
	return t.In(o.Location).Format(format), nil
}

// NewTail returns a new tail for a Kubernetes container inside a pod
func NewTail(clientset corev1client.CoreV1Interface, nodeName, namespace, podName, containerName string, tmpl *template.Template, out, errOut io.Writer, options *TailOptions) *Tail {
	podColor, containerColor := determineColor(podName)

return &Tail{
		clientset:      clientset,
		NodeName:       nodeName,
		Namespace:      namespace,
		PodName:        podName,
		ContainerName:  containerName,
		Options:        options,
		closed:         make(chan struct{}),
		tmpl:           tmpl,
		podColor:       podColor,
		containerColor: containerColor,

out:    out,
		errOut: errOut,
	}
}

var colorList = [][2]*color.Color{
	{color.New(color.FgHiCyan), color.New(color.FgCyan)},
	{color.New(color.FgHiGreen), color.New(color.FgGreen)},
	{color.New(color.FgHiMagenta), color.New(color.FgMagenta)},
	{color.New(color.FgHiYellow), color.New(color.FgYellow)},
	{color.New(color.FgHiBlue), color.New(color.FgBlue)},
	{color.New(color.FgHiRed), color.New(color.FgRed)},
}

func determineColor(podName string) (podColor, containerColor *color.Color) {
	hash := fnv.New32()
	_, _ = hash.Write([]byte(podName))
	idx := hash.Sum32() % uint32(len(colorList))

colors := colorList[idx]
	return colors[0], colors[1]
}

// Start starts tailing
func (t *Tail) Start(ctx context.Context) error {
	ctx, cancel := context.WithCancel(ctx)
	go func() {
		<-t.closed
		cancel()
	}()

t.printStarting()

req := t.clientset.Pods(t.Namespace).GetLogs(t.PodName, &corev1.PodLogOptions{
		Follow:       t.Options.Follow,
		Timestamps:   true,
		Container:    t.ContainerName,
		SinceSeconds: t.Options.SinceSeconds,
		SinceTime:    t.Options.SinceTime,
		TailLines:    t.Options.TailLines,
	})

err := t.ConsumeRequest(ctx, req)

if errors.Is(err, context.Canceled) {
		return nil
	}

return err
}

func (t *Tail) Resume(ctx context.Context, resumeRequest *ResumeRequest) error {
	sinceTime, err := resumeRequest.sinceTime()
	if err != nil {
		fmt.Fprintf(t.errOut, "failed to resume: %s, fallback to Start()\n", err)
		return t.Start(ctx)
	}
	t.resumeRequest = resumeRequest
	t.Options.SinceTime = sinceTime
	t.Options.SinceSeconds = nil
	t.Options.TailLines = nil
	return t.Start(ctx)
}

// Close stops tailing
func (t *Tail) Close() {
	t.printStopping()

close(t.closed)
}

func (t *Tail) printStarting() {
	if !t.Options.OnlyLogLines {
		g := color.New(color.FgHiGreen, color.Bold).SprintFunc()
		p := t.podColor.SprintFunc()
		c := t.containerColor.SprintFunc()
		if t.Options.Namespace {
			fmt.Fprintf(t.errOut, "%s %s %s › %s\n", g("+"), p(t.Namespace), p(t.PodName), c(t.ContainerName))
		} else {
			fmt.Fprintf(t.errOut, "%s %s › %s\n", g("+"), p(t.PodName), c(t.ContainerName))
		}
	}
}

func (t *Tail) printStopping() {
	if !t.Options.OnlyLogLines {
		r := color.New(color.FgHiRed, color.Bold).SprintFunc()
		p := t.podColor.SprintFunc()
		c := t.containerColor.SprintFunc()
		if t.Options.Namespace {
			fmt.Fprintf(t.errOut, "%s %s %s › %s\n", r("-"), p(t.Namespace), p(t.PodName), c(t.ContainerName))
		} else {
			fmt.Fprintf(t.errOut, "%s %s › %s\n", r("-"), p(t.PodName), c(t.ContainerName))
		}
	}
}

// ConsumeRequest reads the data from request and writes into the out
// writer.
func (t *Tail) ConsumeRequest(ctx context.Context, request rest.ResponseWrapper) error {
	stream, err := request.Stream(ctx)
	if err != nil {
		return err
	}
	defer stream.Close()

r := bufio.NewReader(stream)
	for {
		line, err := r.ReadBytes('\n')
		if len(line) != 0 {
			t.consumeLine(strings.TrimSuffix(string(line), "\n"))
		}

if err != nil {
			if err != io.EOF {
				return err
			}
			return nil
		}
	}
}

// Print prints a color coded log message with the pod and container names
func (t *Tail) Print(msg string) {
	vm := Log{
		Message:        msg,
		NodeName:       t.NodeName,
		Namespace:      t.Namespace,
		PodName:        t.PodName,
		ContainerName:  t.ContainerName,
		PodColor:       t.podColor,
		ContainerColor: t.containerColor,
	}

var buf bytes.Buffer
	if err := t.tmpl.Execute(&buf, vm); err != nil {
		fmt.Fprintf(t.errOut, "expanding template failed: %s\n", err)
		return
	}

fmt.Fprint(t.out, buf.String())
}

func (t *Tail) GetResumeRequest() *ResumeRequest {
	if t.last.timestamp == "" {
		return nil
	}
	return &ResumeRequest{Timestamp: t.last.timestamp, LinesToSkip: t.last.lines}
}

func (t *Tail) consumeLine(line string) {
	rfc3339Nano, content, err := splitLogLine(line)
	if err != nil {
		t.Print(fmt.Sprintf("[%v] %s", err, line))
		return
	}

// PodLogOptions.SinceTime is RFC3339, not RFC3339Nano.
	// We convert it to RFC3339 to skip the lines seen during this timestamp when resuming.
	rfc3339 := removeSubsecond(rfc3339Nano)
	t.rememberLastTimestamp(rfc3339)
	if t.resumeRequest.shouldSkip(rfc3339) {
		return
	}

if t.Options.IsExclude(content) || !t.Options.IsInclude(content) {
		return
	}

msg := t.Options.HighlightMatchedString(content)

if t.Options.Timestamps {
		updatedTs, err := t.Options.UpdateTimezoneAndFormat(rfc3339Nano)
		if err != nil {
			t.Print(fmt.Sprintf("[%v] %s", err, line))
			return
		}
		msg = updatedTs + " " + msg
	}

t.Print(msg)
}

func (t *Tail) rememberLastTimestamp(timestamp string) {
	if t.last.timestamp == timestamp {
		t.last.lines++
		return
	}
	t.last.timestamp = timestamp
	t.last.lines = 1
}

// Log is the object which will be used together with the template to generate
// the output.
type Log struct {
	// Message is the log message itself
	Message string `json:"message"`

// Node name of the pod
	NodeName string `json:"nodeName"`

// Namespace of the pod
	Namespace string `json:"namespace"`

// PodName of the pod
	PodName string `json:"podName"`

// ContainerName of the container
	ContainerName string `json:"containerName"`

PodColor       *color.Color `json:"-"`
	ContainerColor *color.Color `json:"-"`
}

func (r *ResumeRequest) sinceTime() (*metav1.Time, error) {
	sinceTime, err := time.Parse(time.RFC3339, r.Timestamp)

if err != nil {
		return nil, err
	}
	metaTime := metav1.NewTime(sinceTime)
	return &metaTime, nil
}

func (r *ResumeRequest) shouldSkip(timestamp string) bool {
	if r == nil {
		return false
	}
	if r.Timestamp == "" {
		return false
	}
	if r.Timestamp != timestamp {
		return false
	}
	if r.LinesToSkip <= 0 {
		return false
	}
	r.LinesToSkip--
	return true
}

func splitLogLine(line string) (timestamp string, content string, err error) {
	idx := strings.IndexRune(line, ' ')
	if idx == -1 {
		return "", "", errors.New("missing timestamp")
	}
	return line[:idx], line[idx+1:], nil
}

// removeSubsecond removes the subsecond of the timestamp.
// It converts RFC3339Nano to RFC3339 fast.
func removeSubsecond(timestamp string) string {
	dot := strings.IndexRune(timestamp, '.')
	if dot == -1 {
		return timestamp
	}
	var last int
	for i := dot; i < len(timestamp); i++ {
		if unicode.IsDigit(rune(timestamp[i])) {
			last = i
		}
	}
	if last == 0 {
		return timestamp
	}
	return timestamp[:dot] + timestamp[last+1:]
}
07070100000031000081A400000000000000000000000164388A3F0000276A000000000000000000000000000000000000002000000000stern-1.25.0/stern/tail_test.gopackage stern

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"reflect"
	"regexp"
	"testing"
	"text/template"
	"time"

"github.com/fatih/color"
	"k8s.io/client-go/kubernetes/fake"
)

func TestDetermineColor(t *testing.T) {
	podName := "stern"
	podColor1, containerColor1 := determineColor(podName)
	podColor2, containerColor2 := determineColor(podName)

if podColor1 != podColor2 {
		t.Errorf("expected color for pod to be the same between invocations but was %v and %v",
			podColor1, podColor2)
	}
	if containerColor1 != containerColor2 {
		t.Errorf("expected color for container to be the same between invocations but was %v and %v",
			containerColor1, containerColor2)
	}
}

func TestIsIncludeTestOptions(t *testing.T) {
	msg := "this is a log message"

tests := []struct {
		include  []*regexp.Regexp
		expected bool
	}{
		{
			include:  []*regexp.Regexp{},
			expected: true,
		},
		{
			include: []*regexp.Regexp{
				regexp.MustCompile(`this is not`),
			},
			expected: false,
		},
		{
			include: []*regexp.Regexp{
				regexp.MustCompile(`this is`),
			},
			expected: true,
		},
	}

for i, tt := range tests {
		o := &TailOptions{Include: tt.include}
		if o.IsInclude(msg) != tt.expected {
			t.Errorf("%d: expected %s, but actual %s", i, fmt.Sprint(tt.expected), fmt.Sprint(!tt.expected))
		}
	}
}

func TestUpdateTimezoneAndFormat(t *testing.T) {
	location, _ := time.LoadLocation("Asia/Tokyo")

tests := []struct {
		name     string
		format   string
		message  string
		expected string
		err      string
	}{
		{
			"normal case",
			"", // default format is used if empty
			"2021-04-18T03:54:44.764981564Z",
			"2021-04-18T12:54:44.764981564+09:00",
			"",
		},
		{
			"padding",
			"",
			"2021-04-18T03:54:44.764981500Z",
			"2021-04-18T12:54:44.764981500+09:00",
			"",
		},
		{
			"timestamp required on non timestamp message",
			"",
			"",
			"",
			"missing timestamp",
		},
		{
			"not UTC",
			"",
			"2021-08-03T01:26:29.953994922+02:00",
			"2021-08-03T08:26:29.953994922+09:00",
			"",
		},
		{
			"RFC3339Nano format removed trailing zeros",
			"",
			"2021-06-20T08:20:30.331385Z",
			"2021-06-20T17:20:30.331385000+09:00",
			"",
		},
		{
			"Specified the short format",
			TimestampFormatShort,
			"2021-06-20T08:20:30.331385Z",
			"06-20 17:20:30",
			"",
		},
	}

for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			tailOptions := &TailOptions{
				Location:        location,
				TimestampFormat: tt.format,
			}

message, err := tailOptions.UpdateTimezoneAndFormat(tt.message)
			if tt.expected != message {
				t.Errorf("expected %q, but actual %q", tt.expected, message)
			}

if err != nil && tt.err != err.Error() {
				t.Errorf("expected %q, but actual %q", tt.err, err)
			}
		})
	}
}

func TestConsumeStreamTail(t *testing.T) {
	logLines := `2023-02-13T21:20:30.000000001Z line 1
2023-02-13T21:20:30.000000002Z line 2
2023-02-13T21:20:31.000000001Z line 3
2023-02-13T21:20:31.000000002Z line 4`
	tmpl := template.Must(template.New("").Parse(`{{printf "%s (%s/%s/%s/%s)\n" .Message .NodeName .Namespace .PodName .ContainerName}}`))

tests := []struct {
		name      string
		resumeReq *ResumeRequest
		expected  []byte
	}{
		{
			name: "normal",
			expected: []byte(`line 1 (my-node/my-namespace/my-pod/my-container)
line 2 (my-node/my-namespace/my-pod/my-container)
line 3 (my-node/my-namespace/my-pod/my-container)
line 4 (my-node/my-namespace/my-pod/my-container)
`),
		},
		{
			name:      "ResumeRequest LinesToSkip=1",
			resumeReq: &ResumeRequest{Timestamp: "2023-02-13T21:20:30Z", LinesToSkip: 1},
			expected: []byte(`line 2 (my-node/my-namespace/my-pod/my-container)
line 3 (my-node/my-namespace/my-pod/my-container)
line 4 (my-node/my-namespace/my-pod/my-container)
`),
		},
		{
			name:      "ResumeRequest LinesToSkip=2",
			resumeReq: &ResumeRequest{Timestamp: "2023-02-13T21:20:30Z", LinesToSkip: 2},
			expected: []byte(`line 3 (my-node/my-namespace/my-pod/my-container)
line 4 (my-node/my-namespace/my-pod/my-container)
`),
		},
		{
			name:      "ResumeRequest LinesToSkip=3 (exceed)",
			resumeReq: &ResumeRequest{Timestamp: "2023-02-13T21:20:30Z", LinesToSkip: 3},
			expected: []byte(`line 3 (my-node/my-namespace/my-pod/my-container)
line 4 (my-node/my-namespace/my-pod/my-container)
`),
		},
		{
			name:      "ResumeRequest does not match",
			resumeReq: &ResumeRequest{Timestamp: "2222-22-22T21:20:30Z", LinesToSkip: 3},
			expected: []byte(`line 1 (my-node/my-namespace/my-pod/my-container)
line 2 (my-node/my-namespace/my-pod/my-container)
line 3 (my-node/my-namespace/my-pod/my-container)
line 4 (my-node/my-namespace/my-pod/my-container)
`),
		},
	}

clientset := fake.NewSimpleClientset()
	for i, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			out := new(bytes.Buffer)
			tail := NewTail(clientset.CoreV1(), "my-node", "my-namespace", "my-pod", "my-container", tmpl, out, io.Discard, &TailOptions{})
			tail.resumeRequest = tt.resumeReq
			if err := tail.ConsumeRequest(context.TODO(), &responseWrapperMock{data: bytes.NewBufferString(logLines)}); err != nil {
				t.Fatalf("%d: unexpected err %v", i, err)
			}

if !bytes.Equal(tt.expected, out.Bytes()) {
				t.Errorf("%d: expected %s, but actual %s", i, tt.expected, out)
			}
		})
	}
}

type responseWrapperMock struct {
	data io.Reader
}

func (r *responseWrapperMock) DoRaw(context.Context) ([]byte, error) {
	data, _ := io.ReadAll(r.data)
	return data, nil
}

func (r *responseWrapperMock) Stream(context.Context) (io.ReadCloser, error) {
	return io.NopCloser(r.data), nil
}

func TestPrintStarting(t *testing.T) {
	tests := []struct {
		options  *TailOptions
		expected []byte
	}{
		{
			&TailOptions{},
			[]byte("+ my-pod › my-container\n"),
		},
		{
			&TailOptions{
				Namespace: true,
			},
			[]byte("+ my-namespace my-pod › my-container\n"),
		},
		{
			&TailOptions{
				OnlyLogLines: true,
			},
			[]byte{},
		},
		{
			&TailOptions{
				Namespace:    true,
				OnlyLogLines: true,
			},
			[]byte{},
		},
	}

clientset := fake.NewSimpleClientset()
	for i, tt := range tests {
		errOut := new(bytes.Buffer)
		tail := NewTail(clientset.CoreV1(), "my-node", "my-namespace", "my-pod", "my-container", nil, io.Discard, errOut, tt.options)
		tail.printStarting()

if !bytes.Equal(tt.expected, errOut.Bytes()) {
			t.Errorf("%d: expected %q, but actual %q", i, tt.expected, errOut)
		}
	}
}

func TestPrintStopping(t *testing.T) {
	tests := []struct {
		options  *TailOptions
		expected []byte
	}{
		{
			&TailOptions{},
			[]byte("- my-pod › my-container\n"),
		},
		{
			&TailOptions{
				Namespace: true,
			},
			[]byte("- my-namespace my-pod › my-container\n"),
		},
		{
			&TailOptions{
				OnlyLogLines: true,
			},
			[]byte{},
		},
		{
			&TailOptions{
				Namespace:    true,
				OnlyLogLines: true,
			},
			[]byte{},
		},
	}

if !bytes.Equal(tt.expected, errOut.Bytes()) {
			t.Errorf("%d: expected %q, but actual %q", i, tt.expected, errOut)
		}
	}
}

func TestResumeRequestShouldSkip(t *testing.T) {
	tests := []struct {
		rr         ResumeRequest
		timestamps []string
		expected   []bool
	}{
		{
			rr:         ResumeRequest{Timestamp: "t1", LinesToSkip: 1},
			timestamps: []string{"t1", "t1"},
			expected:   []bool{true, false},
		},
		{
			rr:         ResumeRequest{Timestamp: "t1", LinesToSkip: 3},
			timestamps: []string{"t1", "t1", "t1", "t1"},
			expected:   []bool{true, true, true, false},
		},
		{
			rr:         ResumeRequest{Timestamp: "t1", LinesToSkip: 3},
			timestamps: []string{"t2", "t2"},
			expected:   []bool{false, false},
		},
	}
	for _, tt := range tests {
		var actual []bool
		for _, ts := range tt.timestamps {
			actual = append(actual, tt.rr.shouldSkip(ts))
		}
		if !reflect.DeepEqual(tt.expected, actual) {
			t.Errorf("expected %v, but actual %v", tt.expected, actual)
		}
	}
}

func TestRemoveSubsecond(t *testing.T) {
	tests := []struct {
		ts       string
		expected string
	}{
		{
			ts:       "2023-02-14T05:36:39.902767599Z",
			expected: "2023-02-14T05:36:39Z",
		},
		{
			ts:       "2023-02-14T05:36:39.1Z",
			expected: "2023-02-14T05:36:39Z",
		},
		{
			ts:       "2023-02-14T05:36:39Z",
			expected: "2023-02-14T05:36:39Z",
		},
		{
			ts:       "1.1",
			expected: "1",
		},
		{
			ts:       "10.1",
			expected: "10",
		},
		{
			ts:       "",
			expected: "",
		},
		{
			ts:       ".",
			expected: ".",
		},
		{
			ts:       ".1",
			expected: "",
		},
	}
	for _, tt := range tests {
		actual := removeSubsecond(tt.ts)
		if tt.expected != actual {
			t.Errorf("expected %v, but actual %v", tt.expected, actual)
		}
	}
}

func TestHighlightMatchedString(t *testing.T) {
	tests := []struct {
		msg      string
		include  []*regexp.Regexp
		expected string
	}{
		{
			"test matched",
			[]*regexp.Regexp{
				regexp.MustCompile(`test`),
			},
			"\x1b[31;1mtest\x1b[0m matched",
		},
		{
			"test not-matched",
			[]*regexp.Regexp{
				regexp.MustCompile(`hoge`),
			},
			"test not-matched",
		},
		{
			"test matched",
			[]*regexp.Regexp{
				regexp.MustCompile(`not-matched`),
				regexp.MustCompile(`matched`),
			},
			"test \x1b[31;1mmatched\x1b[0m",
		},
		{
			"test multiple matched",
			[]*regexp.Regexp{
				regexp.MustCompile(`multiple`),
				regexp.MustCompile(`matched`),
			},
			"test \x1b[31;1mmultiple\x1b[0m \x1b[31;1mmatched\x1b[0m",
		},
		{
			"test match on the longer one",
			[]*regexp.Regexp{
				regexp.MustCompile(`match`),
				regexp.MustCompile(`match on the longer one`),
			},
			"test \x1b[31;1mmatch on the longer one\x1b[0m",
		},
	}

orig := color.NoColor
	color.NoColor = false
	defer func() {
		color.NoColor = orig
	}()

for i, tt := range tests {
		o := &TailOptions{Include: tt.include}
		actual := o.HighlightMatchedString(tt.msg)
		if actual != tt.expected {
			t.Errorf("%d: expected %q, but actual %q", i, tt.expected, actual)
		}
	}
}
07070100000032000081A400000000000000000000000164388A3F00001631000000000000000000000000000000000000001D00000000stern-1.25.0/stern/target.go//   Copyright 2017 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package stern

import (
	"fmt"
	"regexp"
	"sync"

corev1 "k8s.io/api/core/v1"
	"k8s.io/klog/v2"
)

// Target is a target to watch
type Target struct {
	Node      string
	Namespace string
	Pod       string
	Container string
}

// GetID returns the ID of the object
func (t *Target) GetID() string {
	return fmt.Sprintf("%s-%s-%s", t.Namespace, t.Pod, t.Container)
}

// targetState holds a last shown container ID
type targetState struct {
	podUID      string
	containerID string
}

// targetFilter is a filter of Target
type targetFilter struct {
	c            targetFilterConfig
	targetStates map[string]*targetState
	mu           sync.RWMutex
}

type targetFilterConfig struct {
	podFilter              *regexp.Regexp
	excludePodFilter       []*regexp.Regexp
	containerFilter        *regexp.Regexp
	containerExcludeFilter []*regexp.Regexp
	initContainers         bool
	ephemeralContainers    bool
	containerStates        []ContainerState
}

func newTargetFilter(c targetFilterConfig) *targetFilter {
	return &targetFilter{
		c:            c,
		targetStates: make(map[string]*targetState),
	}
}

// visit passes filtered Targets to the visitor function
func (f *targetFilter) visit(pod *corev1.Pod, visitor func(t *Target)) {
	// filter by pod
	if !f.c.podFilter.MatchString(pod.Name) {
		return
	}

for _, re := range f.c.excludePodFilter {
		if re.MatchString(pod.Name) {
			return
		}
	}

// filter by container statuses
	var statuses []corev1.ContainerStatus
	if f.c.initContainers {
		// show initContainers first when --no-follow and --max-log-requests 1
		statuses = append(statuses, pod.Status.InitContainerStatuses...)
	}

statuses = append(statuses, pod.Status.ContainerStatuses...)

if f.c.ephemeralContainers {
		statuses = append(statuses, pod.Status.EphemeralContainerStatuses...)
	}

OUTER:
	for _, c := range statuses {
		if !f.c.containerFilter.MatchString(c.Name) {
			continue
		}

for _, re := range f.c.containerExcludeFilter {
			if re.MatchString(c.Name) {
				continue OUTER
			}
		}

t := &Target{
			Node:      pod.Spec.NodeName,
			Namespace: pod.Namespace,
			Pod:       pod.Name,
			Container: c.Name,
		}

if f.shouldAdd(t, string(pod.UID), c) {
			visitor(t)
		}
	}
}

func (f *targetFilter) matchContainerState(state corev1.ContainerState) bool {
	for _, containerState := range f.c.containerStates {
		if containerState.Match(state) {
			return true
		}
	}
	return false
}

func (f *targetFilter) shouldAdd(t *Target, podUID string, cs corev1.ContainerStatus) bool {
	state := stateToString(cs.State)
	containerID := chooseContainerID(cs)

f.mu.Lock()
	last := f.targetStates[t.GetID()]
	f.targetStates[t.GetID()] = &targetState{podUID: podUID, containerID: containerID}
	f.mu.Unlock()

if containerID == "" {
		// does not have a container to retrieve logs
		klog.V(7).InfoS("Container ID is empty", "state", state, "target", t.GetID())
		return false
	}

if last == nil {
		// We filter out only containers that have existed before stern starts by container states.
		// The container state transition skips the "running" when a pod immediately completes,
		// so filtering by container states does not work as expected for newly created containers.
		klog.V(7).InfoS("Container ID has existed before observation",
			"state", state, "target", t.GetID(), "container", containerID)
		return f.matchContainerState(cs.State)
	}

if last.containerID == containerID {
		klog.V(7).InfoS("Container ID is the same",
			"state", state, "target", t.GetID(), "container", containerID)
		return false
	}
	// add a container when the container ID is changed from the last time
	klog.V(7).InfoS("Container ID was changed",
		"state", state, "target", t.GetID(), "container", containerID, "last", last.containerID)
	return true
}

func (f *targetFilter) forget(podUID string) {
	f.mu.Lock()
	defer f.mu.Unlock()
	// delete target states belonging to the pod
	for targetID, state := range f.targetStates {
		if state.podUID == podUID {
			klog.V(7).InfoS("Forget targetState", "target", targetID)
			delete(f.targetStates, targetID)
		}
	}
}

func (f *targetFilter) isActive(t *Target) bool {
	f.mu.RLock()
	defer f.mu.RUnlock()
	last := f.targetStates[t.GetID()]
	return last != nil && last.containerID != ""
}

func chooseContainerID(cs corev1.ContainerStatus) string {
	// This logic is based on kubelet's validateContainerLogStatus
	// https://github.com/kubernetes/kubernetes/blob/v1.26.1/pkg/kubelet/kubelet_pods.go#L1246
	switch {
	case cs.State.Running != nil:
		return cs.ContainerID
	case cs.State.Terminated != nil:
		if cs.State.Terminated.ContainerID != "" {
			return cs.State.Terminated.ContainerID
		}
	}
	lastTerminated := cs.LastTerminationState.Terminated
	if lastTerminated != nil && lastTerminated.ContainerID != "" {
		return lastTerminated.ContainerID
	}
	return ""
}

func stateToString(state corev1.ContainerState) string {
	switch {
	case state.Running != nil:
		return "running"
	case state.Terminated != nil:
		return "terminated"
	case state.Waiting != nil:
		return "waiting"
	}
	return "unknown"
}
07070100000033000081A400000000000000000000000164388A3F000044BD000000000000000000000000000000000000002200000000stern-1.25.0/stern/target_test.gopackage stern

import (
	"reflect"
	"regexp"
	"testing"

corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

func TestTargetFilter(t *testing.T) {
	running := corev1.ContainerState{Running: &corev1.ContainerStateRunning{}}
	terminated := corev1.ContainerState{Terminated: &corev1.ContainerStateTerminated{ContainerID: "dummy"}}
	waiting := corev1.ContainerState{Waiting: &corev1.ContainerStateWaiting{}}

createPod := func(node, pod string) *corev1.Pod {
		return &corev1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Namespace: "ns1",
				Name:      pod,
			},
			Spec: corev1.PodSpec{
				NodeName: node,
			},
			Status: corev1.PodStatus{
				InitContainerStatuses: []corev1.ContainerStatus{
					{Name: "init-container1-running", State: running, ContainerID: "dummy"},
					{Name: "init-container2-terminated", State: terminated},
					{Name: "init-container3-waiting", State: waiting, LastTerminationState: terminated},
				},
				ContainerStatuses: []corev1.ContainerStatus{
					{Name: "container1-running", State: running, ContainerID: "dummy"},
					{Name: "container2-terminated", State: terminated},
					{Name: "container3-waiting", State: waiting, LastTerminationState: terminated},
				},
				EphemeralContainerStatuses: []corev1.ContainerStatus{
					{Name: "ephemeral-container1-running", State: running, ContainerID: "dummy"},
					{Name: "ephemeral-container2-terminated", State: terminated},
					{Name: "ephemeral-container3-waiting", State: waiting, LastTerminationState: terminated},
				},
			},
		}
	}

pods := []*corev1.Pod{
		createPod("node1", "pod1"),
		createPod("node2", "pod2"),
	}

genTarget := func(node, pod, container string) Target {
		return Target{
			Namespace: "ns1",
			Node:      node,
			Pod:       pod,
			Container: container,
		}
	}

tests := []struct {
		name     string
		config   targetFilterConfig
		expected []Target
	}{
		{
			name: "match all",
			config: targetFilterConfig{
				podFilter:              regexp.MustCompile(`.*`),
				excludePodFilter:       nil,
				containerFilter:        regexp.MustCompile(`.*`),
				containerExcludeFilter: nil,
				initContainers:         true,
				ephemeralContainers:    true,
				containerStates:        []ContainerState{RUNNING, TERMINATED, WAITING},
			},
			expected: []Target{
				genTarget("node1", "pod1", "init-container1-running"),
				genTarget("node1", "pod1", "init-container2-terminated"),
				genTarget("node1", "pod1", "init-container3-waiting"),
				genTarget("node1", "pod1", "container1-running"),
				genTarget("node1", "pod1", "container2-terminated"),
				genTarget("node1", "pod1", "container3-waiting"),
				genTarget("node1", "pod1", "ephemeral-container1-running"),
				genTarget("node1", "pod1", "ephemeral-container2-terminated"),
				genTarget("node1", "pod1", "ephemeral-container3-waiting"),
				genTarget("node2", "pod2", "init-container1-running"),
				genTarget("node2", "pod2", "init-container2-terminated"),
				genTarget("node2", "pod2", "init-container3-waiting"),
				genTarget("node2", "pod2", "container1-running"),
				genTarget("node2", "pod2", "container2-terminated"),
				genTarget("node2", "pod2", "container3-waiting"),
				genTarget("node2", "pod2", "ephemeral-container1-running"),
				genTarget("node2", "pod2", "ephemeral-container2-terminated"),
				genTarget("node2", "pod2", "ephemeral-container3-waiting"),
			},
		},
		{
			name: "filter by podFilter",
			config: targetFilterConfig{
				podFilter:              regexp.MustCompile(`not-matched`),
				excludePodFilter:       nil,
				containerFilter:        regexp.MustCompile(`.*`),
				containerExcludeFilter: nil,
				initContainers:         true,
				ephemeralContainers:    true,
				containerStates:        []ContainerState{RUNNING, TERMINATED, WAITING},
			},
			expected: []Target{},
		},
		{
			name: "filter by excludePodFilter",
			config: targetFilterConfig{
				podFilter:              regexp.MustCompile(``),
				excludePodFilter:       []*regexp.Regexp{regexp.MustCompile(`pod1`)},
				containerFilter:        regexp.MustCompile(`.*`),
				containerExcludeFilter: nil,
				initContainers:         true,
				ephemeralContainers:    true,
				containerStates:        []ContainerState{RUNNING, TERMINATED, WAITING},
			},
			expected: []Target{
				genTarget("node2", "pod2", "init-container1-running"),
				genTarget("node2", "pod2", "init-container2-terminated"),
				genTarget("node2", "pod2", "init-container3-waiting"),
				genTarget("node2", "pod2", "container1-running"),
				genTarget("node2", "pod2", "container2-terminated"),
				genTarget("node2", "pod2", "container3-waiting"),
				genTarget("node2", "pod2", "ephemeral-container1-running"),
				genTarget("node2", "pod2", "ephemeral-container2-terminated"),
				genTarget("node2", "pod2", "ephemeral-container3-waiting"),
			},
		},
		{
			name: "filter by multiple excludePodFilter",
			config: targetFilterConfig{
				podFilter: regexp.MustCompile(``),
				excludePodFilter: []*regexp.Regexp{
					regexp.MustCompile(`not-matched`),
					regexp.MustCompile(`pod2`),
				},
				containerFilter:        regexp.MustCompile(`.*`),
				containerExcludeFilter: nil,
				initContainers:         true,
				ephemeralContainers:    true,
				containerStates:        []ContainerState{RUNNING, TERMINATED, WAITING},
			},
			expected: []Target{
				genTarget("node1", "pod1", "init-container1-running"),
				genTarget("node1", "pod1", "init-container2-terminated"),
				genTarget("node1", "pod1", "init-container3-waiting"),
				genTarget("node1", "pod1", "container1-running"),
				genTarget("node1", "pod1", "container2-terminated"),
				genTarget("node1", "pod1", "container3-waiting"),
				genTarget("node1", "pod1", "ephemeral-container1-running"),
				genTarget("node1", "pod1", "ephemeral-container2-terminated"),
				genTarget("node1", "pod1", "ephemeral-container3-waiting"),
			},
		},
		{
			name: "filter by containerFilter",
			config: targetFilterConfig{
				podFilter:              regexp.MustCompile(`.*`),
				excludePodFilter:       nil,
				containerFilter:        regexp.MustCompile(`.*container1.*`),
				containerExcludeFilter: nil,
				initContainers:         true,
				ephemeralContainers:    true,
				containerStates:        []ContainerState{RUNNING, TERMINATED, WAITING},
			},
			expected: []Target{
				genTarget("node1", "pod1", "init-container1-running"),
				genTarget("node1", "pod1", "container1-running"),
				genTarget("node1", "pod1", "ephemeral-container1-running"),
				genTarget("node2", "pod2", "init-container1-running"),
				genTarget("node2", "pod2", "container1-running"),
				genTarget("node2", "pod2", "ephemeral-container1-running"),
			},
		},
		{
			name: "filter by containerExcludeFilter",
			config: targetFilterConfig{
				podFilter:              regexp.MustCompile(`.*`),
				excludePodFilter:       nil,
				containerFilter:        regexp.MustCompile(`.*`),
				containerExcludeFilter: []*regexp.Regexp{regexp.MustCompile(`.*container1.*`)},
				initContainers:         true,
				ephemeralContainers:    true,
				containerStates:        []ContainerState{RUNNING, TERMINATED, WAITING},
			},
			expected: []Target{
				genTarget("node1", "pod1", "init-container2-terminated"),
				genTarget("node1", "pod1", "init-container3-waiting"),
				genTarget("node1", "pod1", "container2-terminated"),
				genTarget("node1", "pod1", "container3-waiting"),
				genTarget("node1", "pod1", "ephemeral-container2-terminated"),
				genTarget("node1", "pod1", "ephemeral-container3-waiting"),
				genTarget("node2", "pod2", "init-container2-terminated"),
				genTarget("node2", "pod2", "init-container3-waiting"),
				genTarget("node2", "pod2", "container2-terminated"),
				genTarget("node2", "pod2", "container3-waiting"),
				genTarget("node2", "pod2", "ephemeral-container2-terminated"),
				genTarget("node2", "pod2", "ephemeral-container3-waiting"),
			},
		},
		{
			name: "filter by multiple containerExcludeFilter",
			config: targetFilterConfig{
				podFilter:        regexp.MustCompile(`.*`),
				excludePodFilter: nil,
				containerFilter:  regexp.MustCompile(`.*`),
				containerExcludeFilter: []*regexp.Regexp{
					regexp.MustCompile(`.*container1.*`),
					regexp.MustCompile(`init-container2.*`),
				},
				initContainers:      true,
				ephemeralContainers: true,
				containerStates:     []ContainerState{RUNNING, TERMINATED, WAITING},
			},
			expected: []Target{
				genTarget("node1", "pod1", "init-container3-waiting"),
				genTarget("node1", "pod1", "container2-terminated"),
				genTarget("node1", "pod1", "container3-waiting"),
				genTarget("node1", "pod1", "ephemeral-container2-terminated"),
				genTarget("node1", "pod1", "ephemeral-container3-waiting"),
				genTarget("node2", "pod2", "init-container3-waiting"),
				genTarget("node2", "pod2", "container2-terminated"),
				genTarget("node2", "pod2", "container3-waiting"),
				genTarget("node2", "pod2", "ephemeral-container2-terminated"),
				genTarget("node2", "pod2", "ephemeral-container3-waiting"),
			},
		},
		{
			name: "dot not include initContainers",
			config: targetFilterConfig{
				podFilter:              regexp.MustCompile(`.*`),
				excludePodFilter:       nil,
				containerFilter:        regexp.MustCompile(`.*`),
				containerExcludeFilter: nil,
				initContainers:         false,
				ephemeralContainers:    true,
				containerStates:        []ContainerState{RUNNING, TERMINATED, WAITING},
			},
			expected: []Target{
				genTarget("node1", "pod1", "container1-running"),
				genTarget("node1", "pod1", "container2-terminated"),
				genTarget("node1", "pod1", "container3-waiting"),
				genTarget("node1", "pod1", "ephemeral-container1-running"),
				genTarget("node1", "pod1", "ephemeral-container2-terminated"),
				genTarget("node1", "pod1", "ephemeral-container3-waiting"),
				genTarget("node2", "pod2", "container1-running"),
				genTarget("node2", "pod2", "container2-terminated"),
				genTarget("node2", "pod2", "container3-waiting"),
				genTarget("node2", "pod2", "ephemeral-container1-running"),
				genTarget("node2", "pod2", "ephemeral-container2-terminated"),
				genTarget("node2", "pod2", "ephemeral-container3-waiting"),
			},
		},
		{
			name: "dot not include ephemeralContainers",
			config: targetFilterConfig{
				podFilter:              regexp.MustCompile(`.*`),
				excludePodFilter:       nil,
				containerFilter:        regexp.MustCompile(`.*`),
				containerExcludeFilter: nil,
				initContainers:         true,
				ephemeralContainers:    false,
				containerStates:        []ContainerState{RUNNING, TERMINATED, WAITING},
			},
			expected: []Target{
				genTarget("node1", "pod1", "init-container1-running"),
				genTarget("node1", "pod1", "init-container2-terminated"),
				genTarget("node1", "pod1", "init-container3-waiting"),
				genTarget("node1", "pod1", "container1-running"),
				genTarget("node1", "pod1", "container2-terminated"),
				genTarget("node1", "pod1", "container3-waiting"),
				genTarget("node2", "pod2", "init-container1-running"),
				genTarget("node2", "pod2", "init-container2-terminated"),
				genTarget("node2", "pod2", "init-container3-waiting"),
				genTarget("node2", "pod2", "container1-running"),
				genTarget("node2", "pod2", "container2-terminated"),
				genTarget("node2", "pod2", "container3-waiting"),
			},
		},
		{
			name: "match running states",
			config: targetFilterConfig{
				podFilter:              regexp.MustCompile(`.*`),
				excludePodFilter:       nil,
				containerFilter:        regexp.MustCompile(`.*`),
				containerExcludeFilter: nil,
				initContainers:         true,
				ephemeralContainers:    true,
				containerStates:        []ContainerState{RUNNING},
			},
			expected: []Target{
				genTarget("node1", "pod1", "init-container1-running"),
				genTarget("node1", "pod1", "container1-running"),
				genTarget("node1", "pod1", "ephemeral-container1-running"),
				genTarget("node2", "pod2", "init-container1-running"),
				genTarget("node2", "pod2", "container1-running"),
				genTarget("node2", "pod2", "ephemeral-container1-running"),
			},
		},
	}

for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			actual := []Target{}
			for _, pod := range pods {
				filter := newTargetFilter(tt.config)
				filter.visit(pod, func(target *Target) {
					actual = append(actual, *target)
				})
			}

if !reflect.DeepEqual(tt.expected, actual) {
				t.Errorf("expected %v, but actual %v", tt.expected, actual)
			}
		})
	}
}

func TestTargetFilterShouldAdd(t *testing.T) {
	filter := newTargetFilter(targetFilterConfig{
		// matches all
		podFilter:              regexp.MustCompile(`.*`),
		excludePodFilter:       nil,
		containerFilter:        regexp.MustCompile(`.*`),
		containerExcludeFilter: nil,
		initContainers:         true,
		ephemeralContainers:    true,
		containerStates:        []ContainerState{RUNNING, TERMINATED, WAITING},
	})
	createPod := func(cs corev1.ContainerStatus) *corev1.Pod {
		return &corev1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Namespace: "ns1",
				Name:      "pod1",
				UID:       "uid1",
			},
			Spec: corev1.PodSpec{
				NodeName: "node1",
			},
			Status: corev1.PodStatus{
				ContainerStatuses: []corev1.ContainerStatus{cs},
			},
		}
	}
	genTarget := func(container string) Target {
		return Target{
			Namespace: "ns1",
			Node:      "node1",
			Pod:       "pod1",
			Container: container,
		}
	}
	tests := []struct {
		name     string
		forget   bool
		cs       corev1.ContainerStatus
		expected []Target
	}{
		{
			name:     "empty state should be ignored",
			cs:       corev1.ContainerStatus{Name: "c1"},
			expected: []Target{},
		},
		{
			name: "running container observed the first time",
			cs: corev1.ContainerStatus{
				Name:        "c1",
				ContainerID: "cid1",
				State: corev1.ContainerState{
					Running: &corev1.ContainerStateRunning{},
				},
			},
			expected: []Target{genTarget("c1")},
		},
		{
			name: "same container ID should be ignored",
			cs: corev1.ContainerStatus{
				Name:        "c1",
				ContainerID: "cid1",
				State: corev1.ContainerState{
					Running: &corev1.ContainerStateRunning{},
				},
			},
			expected: []Target{},
		},
		{
			name: "different container ID can be added",
			cs: corev1.ContainerStatus{
				Name:        "c1",
				ContainerID: "cid2", // changed
				State: corev1.ContainerState{
					Running: &corev1.ContainerStateRunning{},
				},
			},
			expected: []Target{genTarget("c1")},
		},
		{
			name:   "forget() allows the same ID ",
			forget: true,
			cs: corev1.ContainerStatus{
				Name:        "c1",
				ContainerID: "cid2",
				State: corev1.ContainerState{
					Running: &corev1.ContainerStateRunning{},
				},
			},
			expected: []Target{genTarget("c1")},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if tt.forget {
				filter.forget("uid1")
			}
			actual := []Target{}
			filter.visit(createPod(tt.cs), func(target *Target) {
				actual = append(actual, *target)
			})
			if !reflect.DeepEqual(tt.expected, actual) {
				t.Errorf("expected %v, but actual %v", tt.expected, actual)
			}
		})
	}
}

func TestChooseContainerID(t *testing.T) {
	lastState := corev1.ContainerState{
		Terminated: &corev1.ContainerStateTerminated{
			ContainerID: "last",
		},
	}
	tests := []struct {
		name     string
		cs       corev1.ContainerStatus
		expected string
	}{
		{
			name: "running",
			cs: corev1.ContainerStatus{
				ContainerID:          "current",
				LastTerminationState: lastState,
				State: corev1.ContainerState{
					Running: &corev1.ContainerStateRunning{},
				},
			},
			expected: "current",
		},
		{
			name: "running (empty)",
			cs: corev1.ContainerStatus{
				LastTerminationState: lastState,
				State: corev1.ContainerState{
					Running: &corev1.ContainerStateRunning{},
				},
			},
			expected: "",
		},
		{
			name: "terminated (current terminated container)",
			cs: corev1.ContainerStatus{
				ContainerID:          "current",
				LastTerminationState: lastState,
				State: corev1.ContainerState{
					Terminated: &corev1.ContainerStateTerminated{
						ContainerID: "terminated",
					},
				},
			},
			expected: "terminated",
		},
		{
			name: "terminated (last terminated container)",
			cs: corev1.ContainerStatus{
				ContainerID:          "current",
				LastTerminationState: lastState,
				State: corev1.ContainerState{
					Terminated: &corev1.ContainerStateTerminated{},
				},
			},
			expected: "last",
		},
		{
			name: "terminated (empty)",
			cs: corev1.ContainerStatus{
				State: corev1.ContainerState{
					Terminated: &corev1.ContainerStateTerminated{},
				},
			},
			expected: "",
		},
		{
			name: "waiting",
			cs: corev1.ContainerStatus{
				ContainerID:          "current",
				LastTerminationState: lastState,
				State: corev1.ContainerState{
					Waiting: &corev1.ContainerStateWaiting{},
				},
			},
			expected: "last",
		},
		{
			name: "waiting (empty)",
			cs: corev1.ContainerStatus{
				ContainerID: "current", // should be ignored
				State: corev1.ContainerState{
					Waiting: &corev1.ContainerStateWaiting{},
				},
			},
			expected: "",
		},
		{
			name: "no current state with last state",
			cs: corev1.ContainerStatus{
				ContainerID:          "current",
				LastTerminationState: lastState,
			},
			expected: "last",
		},
		{
			name:     "empty state",
			cs:       corev1.ContainerStatus{},
			expected: "",
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			actual := chooseContainerID(tt.cs)
			if tt.expected != actual {
				t.Errorf("expected %v, but actual %v", tt.expected, actual)
			}
		})
	}
}
07070100000034000081A400000000000000000000000164388A3F00000954000000000000000000000000000000000000001C00000000stern-1.25.0/stern/watch.go//   Copyright 2016 Wercker Holding BV
//
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//
//       http://www.apache.org/licenses/LICENSE-2.0
//
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.

package stern

import (
	"context"

"github.com/pkg/errors"

corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/fields"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/watch"
	v1 "k8s.io/client-go/kubernetes/typed/core/v1"
	"k8s.io/client-go/tools/cache"
	watchtools "k8s.io/client-go/tools/watch"
)

// Watch starts listening to Kubernetes events and emits modified
// containers/pods. The result is targets added.
func WatchTargets(ctx context.Context, i v1.PodInterface, labelSelector labels.Selector, fieldSelector fields.Selector, filter *targetFilter) (chan *Target, error) {
	// RetryWatcher will make sure that in case the underlying watcher is
	// closed (e.g. due to API timeout or etcd timeout) it will get restarted
	// from the last point without the consumer even knowing about it.
	watcher, err := watchtools.NewRetryWatcher("1", &cache.ListWatch{
		WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
			return i.Watch(ctx, metav1.ListOptions{LabelSelector: labelSelector.String(), FieldSelector: fieldSelector.String()})
		},
	})
	if err != nil {
		return nil, errors.Wrap(err, "failed to create a watcher")
	}

added := make(chan *Target)
	go func() {
		for {
			select {
			case e := <-watcher.ResultChan():
				if e.Object == nil {
					// Closed because of error
					close(added)
					return
				}

pod, ok := e.Object.(*corev1.Pod)
				if !ok {
					continue
				}

switch e.Type {
				case watch.Added, watch.Modified:
					filter.visit(pod, func(t *Target) {
						added <- t
					})
				case watch.Deleted:
					filter.forget(string(pod.UID))
				}
			case <-ctx.Done():
				watcher.Stop()
				close(added)
				return
			}
		}
	}()

return added, nil
}
07070100000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000B00000000TRAILER!!!431 blocks

Places

File stern-1.25.0.obscpio of Package stern (Revision 92080b728e5c30024b5d0d831ea5ebb9)

Places