File fstail-0.1.0.obscpio of Package fstail

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File fstail-0.1.0.obscpio of Package fstail

07070100000000000081A4000000000000000000000001641C1238000005C0000000000000000000000000000000000000001800000000fstail-0.1.0/.DEREK.ymlcurators:
 - alexellis
 - Shikachuu
 - welteki
 - nitishkumar71
 - Jasstkn

features:
 - dco_check
 - comments
 - pr_description_required
 - release_notes

custom_messages:
  - name: template
    value: |
           This project uses Issue and PR templates and requires that all
           users fill out the template in detail before help can be given.

To continue please edit your Issue/PR or open a new one, and
           please provide all the fields requested.

Thank you for your contribution.

- name: propose
    value: |
           This project follows a contributing guide which states that all
           changes must be proposed with an Issue before being worked on.

Please raise an Issue and update your Pull Request to include
           the ID or link as part of the description.

Thank you for your contribution.

- name: test
    value: |
           This project follows a contributing guide which requires that
           all changes are tested before being merged. You should include
           worked examples that a maintainer can run to prove that the
           changes are good.

Screenshots and command line output are also accepted, but
           must show the positive, and negative cases, not just that
           what was added worked as you expected.

Thank you for your contribution.

contributing_url: https://github.com/alexellis/arkade/blob/master/CONTRIBUTING.md
07070100000001000081A4000000000000000000000001641C12380000042B000000000000000000000000000000000000001500000000fstail-0.1.0/LICENSEMIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
07070100000002000081A4000000000000000000000001641C123800000274000000000000000000000000000000000000001600000000fstail-0.1.0/MakefileLDFLAGS := "-s -w"

export GO111MODULE=on

.PHONY: dist
dist:
	mkdir -p bin
	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags $(LDFLAGS)  -o bin/fstail
	CGO_ENABLED=0 GOOS=darwin go build -ldflags $(LDFLAGS)  -o bin/fstail-darwin
	CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -a -ldflags $(LDFLAGS) -installsuffix cgo -o bin/fstail-darwin-arm64
	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags $(LDFLAGS)  -o bin/fstail-arm64
	CGO_ENABLED=0 GOOS=linux GOARCH=arm GOVER=7 go build -ldflags $(LDFLAGS)  -o bin/fstail-armhf
	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags $(LDFLAGS)  -o bin/fstail.exe
07070100000003000081A4000000000000000000000001641C12380000091E000000000000000000000000000000000000001700000000fstail-0.1.0/README.md## fstail - scan a directory for changed files and tail them

**What's this for?**

When you need to see the output from all changed files within a directory.

**Why doesn't `tail -f /var/logs/*` work?**

Unfortunately, `tail -f /logs/*` may not do what you want it to do. Bash will expand `*` to all existing files within `/logs/` and then show the extra lines added to each of them.

It also will not recurse down, any levels deeper than the current directory.

**How is fstail different then?**

`fstail` uses the [gopkg.in/fsnotify](https://pkg.go.dev/gopkg.in/fsnotify.v1@v1.4.7) to detect both new files, and existing files that are changed. It then starts concatenting their contents to the terminal.

I needed this for [actuated.dev](https://actuated.dev) which launches microVMs on servers for CI.

Each VM launched will create a different file at: `/var/log/actuated/GUID.txt`, and `tail -f *` would only find existing files.

### Usage

Tail the current directory:

```
cd /var/log/actuated
fstail

[7cd0d139b24d9cd30e3ad9ce7afcfe5999d2bf20.txt] [   12.770522] bash[1191]: 2023-03-22 11:04:00Z: Running job: arkade-e2e (run-job)
[49c8f4be774730ff6e5070166fc34ac25dc0e320.txt] [   13.363398] bash[1183]: 2023-03-22 11:04:00Z: Running job: arkade-e2e (k3sup)
```

To turn off the file prefix, set `FS_PREFIX=0`.

```
[   12.770522] bash[1191]: 2023-03-22 11:04:00Z: Running job: arkade-e2e (run-job)
[   13.363398] bash[1183]: 2023-03-22 11:04:00Z: Running job: arkade-e2e (k3sup)
```

Tail files in a given directory:

```
fstail /var/log/nginx/
```

By default, the base filename is going to be printed as a prefix for each tailed file:

```bash
1e51959055fb132720d03584388b5ac738689798.txt | Booting Linux Kernel.. OK
13d461e989733fa0f75df5227debab4be3504726.txt | Shutting down in 30s... 
```

To suppress the prefix, run the command with `FS_PREFIX=0`.

### Installation

Download a release binary:

* [fstail releases](https://github.com/alexellis/fstail/releases/)

Or install via Go to install from source:

```bash
go install github.com/alexellis/fstail
```

If you need Go on a Linux system:

```
curl -sLS https://get.arkade.dev | sudo sh
sudo arkade system install go
```

If you wish to build multi-arch binaries on your own machine:

```bash
make dist
```

## License

MIT license.
07070100000004000081A4000000000000000000000001641C12380000007E000000000000000000000000000000000000001400000000fstail-0.1.0/go.modmodule github.com/alexellis/fstail

go 1.19

require gopkg.in/fsnotify.v1 v1.4.7

require golang.org/x/sys v0.6.0 // indirect
07070100000005000081A4000000000000000000000001641C123800000136000000000000000000000000000000000000001400000000fstail-0.1.0/go.sumgolang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
07070100000006000081A4000000000000000000000001641C1238000007EF000000000000000000000000000000000000001500000000fstail-0.1.0/main.gopackage main

import (
	"bufio"
	"fmt"
	"io"
	"log"
	"os"
	"os/signal"
	"path"
	"syscall"
	"time"

fsnotify "gopkg.in/fsnotify.v1"
)

func main() {

if len(os.Args) == 2 {
		if os.Args[1] == "-h" || os.Args[1] == "--help" {
			fmt.Printf(`fstail - Copyright Alex Ellis 2023

Usage:

fstail

fstail /var/log/actuated

FS_PREFIX=0 fstail

`)
			return
		}

}

var wd string

if len(os.Args) > 1 {
		wd = os.Args[1]
	} else {
		cwd, err := os.Getwd()
		if err != nil {
			log.Fatal(err)
		}
		wd = cwd
	}

printers := map[string]*Streamer{}

watcher, err := fsnotify.NewWatcher()
	if err != nil {
		log.Fatal(err)
	}
	defer watcher.Close()

done := make(chan bool)
	go func() {
		for {
			select {
			case event := <-watcher.Events:

if event.Op&fsnotify.Write == fsnotify.Write {
					if _, ok := printers[event.Name]; !ok {
						log.Printf("Found: %s", path.Base(event.Name))
						if f, err := os.Open(event.Name); err == nil {
							s := NewStreamer(f)
							go s.Stream()
							printers[event.Name] = s
						} else {
							log.Println(err)
						}

}
				}
			case err := <-watcher.Errors:
				if err != nil {
					log.Fatalln("Error:", err)
				}
			}
		}
	}()

err = watcher.Add(wd)
	if err != nil {
		log.Fatal(err)
	}

sigs := make(chan os.Signal, 2)
	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)

go func() {
		<-sigs

for _, s := range printers {
			s.Close()
		}
		done <- true
	}()

<-done

}

type Streamer struct {
	f *os.File
}

func NewStreamer(f *os.File) *Streamer {
	return &Streamer{f: f}
}

func (s *Streamer) Stream() {
	base := path.Base(s.f.Name())

prefix := fmt.Sprintf("%s| ", base)
	if v, ok := os.LookupEnv("FS_PREFIX"); ok && v == "0" {
		prefix = ""
	}

reader := bufio.NewReader(s.f)
	for {
		line, err := reader.ReadString('\n')
		if err != nil {
			if err == io.EOF {
				time.Sleep(100 * time.Millisecond)
				continue
			}

break
		}

fmt.Printf("%s%s", prefix, string(line))
	}
}

func (s *Streamer) Close() {
	if s.f != nil {
		s.f.Close()
	}
}
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