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07070100000000000081A400000000000000000000000164AD498C000046AC000000000000000000000000000000000000001C00000000combustion-1.0+git4/LICENSE                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991

Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
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07070100000001000081A400000000000000000000000164AD498C00000198000000000000000000000000000000000000001D00000000combustion-1.0+git4/MakefileMODULEDIR ?= $(DESTDIR)/usr/lib/dracut/modules.d/35combustion

all:

install:
	install -Dm0644 module-setup.sh $(MODULEDIR)/module-setup.sh
	install -Dm0644 combustion.service $(MODULEDIR)/combustion.service
	install -Dm0644 combustion-prepare.service $(MODULEDIR)/combustion-prepare.service
	install -Dm0755 combustion $(MODULEDIR)/combustion
	install -Dm0644 combustion.rules $(MODULEDIR)/combustion.rules
07070100000002000081A400000000000000000000000164AD498C00001266000000000000000000000000000000000000001E00000000combustion-1.0+git4/README.mdCombustion - configure MicroOS on the first boot
================================================

Combustion is a minimal module for dracut, which runs a user provided script on
the first boot of a system.

You can use this to create additional files, install packages, set up devices 
or even re-partition the hard disk. The configuration can be provided as a
shell script, loaded from an external storage media and is run during boot in a 
new system snapshot. On success, the system will directly boot into that new
snapshot, so that no reboot is needed.

Installation
------------

Run `make install` to install it manually. Usually combustion is packaged up
and installed during image builds already.

How to use it
-------------

The configuration files are copied from a filesystem with the LABEL
"combustion", but to be compatible and co-installable with ignition
(https://github.com/coreos/ignition), the LABEL "ignition" is used as fallback.
It expects a directory "combustion" at the root level of the filesystem and
a file "script" inside, which is executed inside a transactional-update shell.

```
 <root directory>
 ├── combustion
 │   ├── script
 │   └── ... other files
 └── ignition (optional)
     └── config.ign
```

If a QEMU fw_cfg blob with the name "opt/org.opensuse.combustion/script" is
found, it is preferred and the content of that is used as script.
Example parameter for QEMU:
-fw_cfg name=opt/org.opensuse.combustion/script,file=/var/combustion-script

You can do everything necessary for initial system configuration from this
script, including addition of ssh keys, adding users, changing passwords
or even doing partitioning changes.

Simple example
--------------

Example for formatting a USB drive and adding a config, which installs the
"vim-small" package and creates a /root/welcome file:

```bash
mkfs.ext4 /dev/sdX
e2label /dev/sdX ignition
mount /dev/sdX /mnt
mkdir -p /mnt/combustion/
cat >/mnt/combustion/script <<EOF
#!/bin/sh
# combustion: network
systemctl enable sshd.service
zypper --non-interactive install vim-small
cp welcome /root/welcome
EOF
echo "Hello User!" >/mnt/combustion/welcome
umount /mnt
```

The "# combustion: network" comment triggers networking initialization before
running the script. This is equivalent to passing "rd.neednet=1" on the kernel
cmdline and so the network configuration parameters (man dracut.cmdline) apply
here as well. If those aren't specified, it defaults to "ip=dhcp" for each
available interface.

More complex configuration example
----------------------------------

This script additionally provides visible feedback during boot, sets a password
and copies a public ssh key (which has to be in the "combustion" folder).

```bash
#!/bin/bash
# combustion: network
# Redirect output to the console
exec > >(exec tee -a /dev/tty0) 2>&1
# Set a password for root, generate the hash with "openssl passwd -6"
echo 'root:$5$.wn2BZHlEJ5R3B1C$TAHEchlU.h2tvfOpOki54NaHpGYKwdNhjaBuSpDotD7' | chpasswd -e
# Add a public ssh key and enable sshd
mkdir -pm700 /root/.ssh/
cat id_rsa_new.pub >> /root/.ssh/authorized_keys
systemctl enable sshd.service
# Install vim-small
zypper --non-interactive install vim-small
# Leave a marker
echo "Configured with combustion" > /etc/issue.d/combustion
```

How it works
------------

The ignition-dracut-grub2 package contains a GRUB2 config snippet which adds
`ignition.firstboot` to the kernel commandline unless the
`/boot/writable/firstboot_happened` flag file exists.

If this option is found on the kernel cmdline, combustion.service's
ConditionKernelCommandLine is fulfilled and it'll be required by initrd.target.
This pulls in combustion-prepare.service, which runs after the config drive or
QEMU fw_cfg blob appears (see combustion.rules for details). It is read and if
the "network" flag comment is present, enables networking for later.
After /sysroot is mounted and network is up (if enabled), combustion.service
runs, which tries to activate all mountpoints in the system's /etc/fstab and
then calls transactional-update in a chroot.

In this transactional-update session the script is started and the exit code
recorded. If the script failed, transactional-update rollback is called and
combustion.service marked as failed, which causes booting to fail. Note that a
missing config drive or script is not considered a fatal error and only results
in a warning.

/sysroot is unmounted and mounted again, so that the default subvolume gets
reevaluated and directly booted into.

The ignition-firstboot-complete service in the final system runs, which creates
the firstboot_happened flag file. Thus combustion does not run on subsequent
boots.
07070100000003000081A400000000000000000000000164AD498C000017A0000000000000000000000000000000000000001F00000000combustion-1.0+git4/combustion#!/bin/bash
# SPDX-FileCopyrightText: 2020 SUSE LLC
# SPDX-License-Identifier: GPL-2.0-or-later
set -euo pipefail

config_mount="/run/combustion/mount"

if [ "${1-}" = "--prepare" ]; then
	# Mount config drive
	mkdir -p "${config_mount}"

config_drive_found=0

# Try fw_cfg first
	if [ -e "/sys/firmware/qemu_fw_cfg/by_name/opt/org.opensuse.combustion" ]; then
		mkdir -p "${config_mount}/combustion"
		if ! cp /sys/firmware/qemu_fw_cfg/by_name/opt/org.opensuse.combustion/script/raw \
		        "${config_mount}/combustion/script"; then
			echo "Failed to copy script from fw_cfg!"
			exit 1
		fi
		# TODO: Support other files, e.g. with a tarball or fs image?

config_drive_found=1
	fi

# Try disks next - both lower and upper case
	for label in combustion COMBUSTION ignition IGNITION; do
		[ "${config_drive_found}" = "1" ] && break
		[ -e "/dev/disk/by-label/${label}" ] || continue

if ! mount -o ro /dev/disk/by-label/${label} "${config_mount}"; then
			echo "Failed to mount config drive!"
			exit 1
		fi

config_drive_found=1
	done

if [ "${config_drive_found}" = "0" ]; then
		echo "No config drive found"
		exit 0
	fi

# Check for the magic flag "# combustion: network" in the script
	if [ -e "${config_mount}/combustion/script" ] \
	   && grep -qE '^# combustion:(.*)\<network\>' "${config_mount}/combustion/script"; then
		sh -s <<EOF
			. /lib/dracut-lib.sh
			# Set rd.neednet if not already done and reevaluate it (module-specific)
			getargbool 0 'rd.neednet' && exit 0
			echo rd.neednet=1  > /etc/cmdline.d/40-combustion-neednet.conf
			if [ -e /lib/dracut/hooks/pre-udev/60-net-genrules.sh ]; then
				# Wicked
				. /lib/dracut/hooks/pre-udev/60-net-genrules.sh
				# Re-trigger generation of network rules and apply them
				udevadm control --reload
				udevadm trigger --subsystem-match net --action add
			else
				# NetworkManager
				. /lib/dracut/hooks/cmdline/99-nm-config.sh
			fi
EOF
	fi

exit 0
fi

# Use /dev/shm for data exchange
exchangedir="/dev/shm/combustion/"
delete_resolv_conf=0

cleanup() {
	if findmnt "${config_mount}" >/dev/null; then
		umount "${config_mount}" || true
		rmdir "${config_mount}" || true
	else
		rm -rf "${config_mount}" || true
	fi

rm -rf "${exchangedir}" || true

if [ "${delete_resolv_conf}" -eq 1 ]; then
        	rm -f /sysroot/etc/resolv.conf || true
	fi

# umount and remount so that the new default subvol is used
	umount -R /sysroot
	# Manual umount confuses systemd sometimes because it's async and the
	# .mount unit might still be active when the "start" is queued, making
	# it a noop, which ultimately leaves /sysroot unmounted
	# (https://github.com/systemd/systemd/issues/20329). To avoid that,
	# wait until systemd processed the umount events. In a chroot (or with
	# SYSTEMD_OFFLINE=1) systemctl always succeeds, so avoid an infinite loop.
	if ! systemctl --quiet is-active does-not-exist.mount; then
		while systemctl --quiet is-active sysroot.mount; do sleep 0.5; done
	fi
	systemctl start sysroot.mount
}

# Note: The /sysroot remounting during cleanup happens unconditionally.
# This is needed as ignition-mount.service's ExecStop is also disabled unconditionally.
trap cleanup EXIT

if ! [ -d "${config_mount}/combustion" ]; then
	echo "No config found - doing nothing."
	exit 0
fi

# Make sure /sysroot is mounted
systemctl start sysroot.mount

# Same for /sysroot/usr if it exists (e.g. through mount.usr)
if systemctl cat sysroot-usr.mount &>/dev/null; then
	systemctl start sysroot-usr.mount
fi

# Copy config
mkdir "${exchangedir}"
config_dir="${exchangedir}/config"
cp -R "${config_mount}/combustion" "${config_dir}"

if ! [ -e "${config_dir}/script" ]; then
	echo "No config script found."
	exit 1
fi

# Have to take care of x-initrd.mount first and from the outside
awk '$4 ~ /x-initrd.mount/ { system("findmnt /sysroot" $2 " >/dev/null || mount -t " $3 " -o " $4 " " $1 " /sysroot" $2) }' /sysroot/etc/fstab

# Make sure the old snapshot is relabeled too, otherwise syncing its /etc fails.
if [ -e /lib/dracut/hooks/pre-pivot/50-selinux-microos-relabel.sh ]; then
	NEWROOT=/sysroot bash -c '. /lib/dracut-lib.sh; . /lib/dracut/hooks/pre-pivot/50-selinux-microos-relabel.sh'
elif [ -e /sysroot/.autorelabel ] || [ -e /sysroot/etc/selinux/.autorelabel ]; then
	echo "Relabel (probably) needed, but selinux-microos-relabel not found."
	exit 1
fi

# Prepare chroot
for i in proc sys dev; do
	mount --rbind /$i /sysroot/$i
done
mount --make-rslave /sysroot

# Mount everything we can, errors deliberately ignored
chroot /sysroot mount -a || true
# t-u needs writable /var/run and /tmp
findmnt /sysroot/run >/dev/null || mount -t tmpfs tmpfs /sysroot/run
findmnt /sysroot/tmp >/dev/null || mount -t tmpfs tmpfs /sysroot/tmp

# Fake a netconfig setup
if [ -r /etc/resolv.conf ]; then
	mkdir -p /sysroot/run/netconfig/
	cp /etc/resolv.conf /sysroot/run/netconfig/resolv.conf

if ! [ -e /sysroot/etc/resolv.conf ]; then
		if ln -sf /run/netconfig/resolv.conf /sysroot/etc/resolv.conf; then
			delete_resolv_conf=1
		fi
	fi
fi

if [ -x /sysroot/usr/sbin/transactional-update ]; then
	# t-u doesn't allow running arbitrary commands and
	# also ignores the shell's exit code, so DIY.
	if ! chroot /sysroot transactional-update shell <<EOF; then
		cd "${config_dir}"
		chmod a+x script
		./script
		echo \$? > "${exchangedir}/retval"
		# Snapshot got touched while the policy isn't active, needs relabeling again.
		[ -e /etc/selinux/.relabelled ] && >> /etc/selinux/.autorelabel
EOF
		echo "transactional-update failed"
		exit 1
	fi

if ! [ -e "${exchangedir}/retval" ] || [ "$(cat "${exchangedir}/retval")" -ne 0 ]; then
		echo "Command failed, rolling back"
		chroot /sysroot transactional-update --no-selfupdate rollback
		exit 1
	fi
else
	mount -o remount,rw /sysroot
	if ! chroot /sysroot sh -e -c "cd '${config_dir}'; chmod a+x script; ./script"; then
		echo "Command failed"
		exit 1
	fi
	chroot /sysroot snapper --no-dbus create -d "After combustion configuration" || :
fi

rm -f /sysroot/var/lib/YaST2/reconfig_system

exit 0
07070100000004000081A400000000000000000000000164AD498C00000408000000000000000000000000000000000000002F00000000combustion-1.0+git4/combustion-prepare.service[Unit]
Description=Combustion (preparations)
DefaultDependencies=false

# Systemd evaluates Requires/After before conditions, so this unit is pulled in
# even when combustion.service won't run.
ConditionKernelCommandLine=|ignition.firstboot
ConditionKernelCommandLine=|combustion.firstboot

# Config drive has to be available
Wants=dev-combustion-config.device
After=dev-combustion-config.device

# If both Ignition and Combustion are active make sure to run their
# configuration scripts sequentially, as both try to mount the configuration
# device
After=ignition-setup-user.service

# This reconfigures networking, which runs during the initqueue (wicked)
# or has its own service (NM)
Before=dracut-initqueue.service nm-initrd.service

Conflicts=initrd-switch-root.target umount.target
Conflicts=dracut-emergency.service emergency.service emergency.target

# Without this it goes into an endless loop on failure
OnFailure=emergency.target
OnFailureJobMode=isolate

[Service]
Type=oneshot
ExecStart=/usr/bin/combustion --prepare
07070100000005000081A400000000000000000000000164AD498C000006AE000000000000000000000000000000000000002500000000combustion-1.0+git4/combustion.rules# SPDX-FileCopyrightText: 2020 SUSE LLC
# SPDX-License-Identifier: GPL-2.0-or-later

# These rules are needed to work around two systemd limitations:
# - It's not possible to wait for one of multiple devices to appear 
# - ConditionKernelCommandLine is evaluated after Wants/After,
#   so it waits for the devices unnecessarily
# Introduce a dev-combustion-config.device unit as alias to the actual device(s).
# This is only used for the .service dependencies.

# Filesystems with either combustion or ignition as label
ACTION=="add", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="combustion", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
ACTION=="add", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="COMBUSTION", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
ACTION=="add", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="ignition", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
ACTION=="add", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="IGNITION", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
# QEMU fw_cfg blob with key opt/org.opensuse.combustion
ACTION=="add", SUBSYSTEM=="opt", ENV{DEVPATH}=="/firmware/qemu_fw_cfg/by_name/opt/org.opensuse.combustion", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config", TAG+="systemd"

# If combustion won't run, alias it to /dev/null to avoid waiting
ACTION=="add", SUBSYSTEM=="mem", ENV{DEVPATH}=="/devices/virtual/mem/null", GOTO="combustion_dev_null"
GOTO="combustion_end"

LABEL="combustion_dev_null"
# IMPORT has to be on its own as it returns success or not, even with "="...
IMPORT{cmdline}="ignition.firstboot"
IMPORT{cmdline}="combustion.firstboot"
ENV{ignition.firstboot}!="1", ENV{combustion.firstboot}!="1", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config", TAG+="systemd"

LABEL="combustion_end"
07070100000006000081A400000000000000000000000164AD498C000003F1000000000000000000000000000000000000002700000000combustion-1.0+git4/combustion.service[Unit]
Description=Combustion
DefaultDependencies=false

ConditionKernelCommandLine=|ignition.firstboot
ConditionKernelCommandLine=|combustion.firstboot

# /sysroot needs to be available, but it's temporarily stopped
# for remounting so a direct requirement is not possible
Requires=initrd-root-device.target
After=initrd-root-device.target

# combustion-prepare sets up network, if required
Requires=combustion-prepare.service
After=combustion-prepare.service

# Optionally make network available
After=network.target

# After ignition completed its stuff
After=ignition-complete.target

# So that /etc/fstab's x-initrd.mount entries are read (again) later
Before=initrd-parse-etc.service

Conflicts=initrd-switch-root.target umount.target
Conflicts=dracut-emergency.service emergency.service emergency.target

# Without this it goes into an endless loop on failure
OnFailure=emergency.target
OnFailureJobMode=isolate

[Service]
Type=oneshot
ExecStart=/usr/bin/combustion

[Install]
RequiredBy=initrd.target
07070100000007000081A400000000000000000000000164AD498C000004D8000000000000000000000000000000000000002400000000combustion-1.0+git4/module-setup.shdepends() {
	echo bash network systemd url-lib
}

install() {
	inst_simple "${moddir}/combustion.service" "${systemdsystemunitdir}/combustion.service"
	inst_simple "${moddir}/combustion-prepare.service" "${systemdsystemunitdir}/combustion-prepare.service"
	inst_simple "${moddir}/combustion.rules" "/etc/udev/rules.d/70-combustion.rules"
	$SYSTEMCTL -q --root "$initdir" enable combustion.service
	inst_multiple awk chroot findmnt grep rmdir
	inst_simple "${moddir}/combustion" "/usr/bin/combustion"

# ignition-mount.service mounts stuff below /sysroot in ExecStart and umounts
	# it on ExecStop, failing if umounting fails. This conflicts with the
	# mounts/umounts done by combustion. Just let combustion do it instead.
	mkdir -p "${initdir}/${systemdsystemunitdir}/ignition-mount.service.d/"
	echo -e "[Service]\nExecStop=" > "${initdir}/${systemdsystemunitdir}/ignition-mount.service.d/noexecstop.conf"

# Wait up to 10s (30s on aarch64) for the config drive
	devtimeout=10
	[ "$(uname -m)" = "aarch64" ] && devtimeout=30
	mkdir -p "${initdir}/${systemdsystemunitdir}/dev-combustion-config.device.d/"
	echo -e "[Unit]\nJobTimeoutSec=${devtimeout}" > "${initdir}/${systemdsystemunitdir}/dev-combustion-config.device.d/timeout.conf"
}
07070100000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000B00000000TRAILER!!!70 blocks

Places

File combustion-1.0+git4.obscpio of Package combustion (Revision 33dfcfed585870ce3f5d21ad6041f424)

Places