File combustion-1.0+git2.obscpio of Package combustion
07070100000000000081A400000000000000000000000162FE36E4000046AC000000000000000000000000000000000000001C00000000combustion-1.0+git2/LICENSE GNU GENERAL PUBLIC LICENSE
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07070100000001000081A400000000000000000000000162FE36E400000198000000000000000000000000000000000000001D00000000combustion-1.0+git2/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
07070100000002000081A400000000000000000000000162FE36E40000124E000000000000000000000000000000000000001E00000000combustion-1.0+git2/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 created a flag file which tells GRUB 2 that
it's the first boot of the system and so GRUB adds ignition.firstboot to the
kernel commandline.
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 deletes
the flag file. This means that combustion is not run on subsequent boots.
07070100000003000081A400000000000000000000000162FE36E4000017A0000000000000000000000000000000000000001F00000000combustion-1.0+git2/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
07070100000004000081A400000000000000000000000162FE36E400000408000000000000000000000000000000000000002F00000000combustion-1.0+git2/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
07070100000005000081A400000000000000000000000162FE36E4000005D0000000000000000000000000000000000000002500000000combustion-1.0+git2/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}=="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"
07070100000006000081A400000000000000000000000162FE36E4000003F1000000000000000000000000000000000000002700000000combustion-1.0+git2/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
07070100000007000081A400000000000000000000000162FE36E4000004D8000000000000000000000000000000000000002400000000combustion-1.0+git2/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!!!69 blocks
