File combustion-1.5.obscpio of Package combustion
07070100000000000041ED00000000000000000000000267DD60B600000000000000000000000000000000000000000000001700000000combustion-1.5/.github07070100000001000041ED00000000000000000000000267DD60B600000000000000000000000000000000000000000000002100000000combustion-1.5/.github/workflows07070100000002000081A400000000000000000000000167DD60B600000266000000000000000000000000000000000000002A00000000combustion-1.5/.github/workflows/test.ymlname: MicroOS in QEMU
on:
push:
branches: [ master ]
pull_request:
branches: [ master ]
jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Install dependencies
run: |
sudo apt update
sudo apt install -y qemu-system-x86
# Normally setfacl -m u:$USER:rw /dev/kvm should work, but for some
# reason this only sticks around for a single QEMU run. udev?
sudo usermod -a -G kvm "$USER"
- name: Test
run: |
# Needed to activate the new kvm group membership
sudo -u "$USER" bash test/test.sh
07070100000003000041ED00000000000000000000000267DD60B600000000000000000000000000000000000000000000001B00000000combustion-1.5/30firstboot07070100000004000081A400000000000000000000000167DD60B60000063F000000000000000000000000000000000000002C00000000combustion-1.5/30firstboot/firstboot-detect#!/bin/sh
set -eu
what="$(systemctl show -P What sysroot.mount)"
opts="$(systemctl show -P Options sysroot.mount)"
# Catch cases where sysroot isn't a device,
# especially kiwi's install:CDLABEL=INSTALL syntax.
if ! echo "$what" | grep -q ^/; then
echo "Unable to detect firstboot on $what" >&2
exit 0
fi
mount -o "$opts" "$what" /sysroot
# Handle x-initrd.mount without initrd-parse-etc.service
awk '$1 !~ /^#/ && $4 ~ /(\<|,)x-initrd\.mount(\>|,)/ && ! ( $2 == "/etc" && $3 == "none" ) { if(system("mount --target-prefix /sysroot --fstab /sysroot/etc/fstab " $2) != 0) exit 1; }' /sysroot/etc/fstab
if ! [ -e /sysroot/etc/machine-id ] \
|| grep -qw 'ignition\.firstboot' /proc/cmdline || grep -qw 'combustion\.firstboot' /proc/cmdline; then
echo "Firstboot detected"
if [ "$(uname -m)" = "s390x" ]; then
# On s390x, attached DASDs need to be enabled first to appear as block devices.
# On the first boot this is necessary to probe for configuration sources.
echo "Trying to enable all available DASDs"
chzdev dasd --offline --existing --enable --active || echo "Couldn't enable all DASD devices, trying to continue anyway." >&2
fi
# Make initrd.target require firstboot.target
systemctl enable --quiet firstboot.target
# As initrd.target/start was already scheduled, ^ does not have any immediate effect.
# Triggering a start of initrd.target again schedules the missing jobs.
# With --job-mode=fail this fails if any of those missing jobs is destructive, likely
# caused by dep cycles in firstboot units.
systemctl start --now --no-block --job-mode=fail initrd.target
fi
07070100000005000081A400000000000000000000000167DD60B6000004B8000000000000000000000000000000000000003400000000combustion-1.5/30firstboot/firstboot-detect.service[Unit]
Description=Detect Firstboot
DefaultDependencies=no
# In this mode, the zipl initrd uses grub2-emu to kexec the real kernel
# and initrd. Don't run there, only in the real initrd (bsc#1218065).
ConditionKernelCommandLine=!initgrub
# This needs /sysroot to be mountable
# Should also include systemd-fsck-root, but that would create a cycle
# with dracut-initqueue below.
Requires=initrd-root-device.target
After=initrd-root-device.target
# But before it's actually mounted
Before=sysroot.mount
# Combustion/ignition may configure networking, which runs during
# the initqueue (wicked) or has its own service (NM)
Before=dracut-initqueue.service nm-initrd.service
# Make sure this is stopped before switch root or emergency:
# https://github.com/systemd/systemd/issues/3436
Conflicts=initrd-switch-root.target umount.target
Conflicts=dracut-emergency.service emergency.service emergency.target
[Service]
Type=oneshot
# This has to mount /sysroot as /sysroot, but starting sysroot.mount would
# screw up ordering
PrivateMounts=true
# Work around https://github.com/systemd/systemd/issues/28723
TemporaryFileSystem=/run/mount
ExecStart=/usr/bin/firstboot-detect
[Install]
RequiredBy=initrd.target
07070100000006000081A400000000000000000000000167DD60B60000012F000000000000000000000000000000000000002C00000000combustion-1.5/30firstboot/firstboot.target[Unit]
Description=Initrd Firstboot
# Make sure this is stopped before switch root or emergency:
# https://github.com/systemd/systemd/issues/3436
Conflicts=initrd-switch-root.target umount.target
Conflicts=dracut-emergency.service emergency.service emergency.target
[Install]
RequiredBy=initrd.target
07070100000007000081A400000000000000000000000167DD60B600000369000000000000000000000000000000000000002B00000000combustion-1.5/30firstboot/module-setup.shcheck() {
# Pulled in by other modules only
return 255
}
depends() {
echo bash systemd
}
install() {
inst_simple "${moddir}/firstboot-detect.service" "${systemdsystemunitdir}/firstboot-detect.service"
inst_simple "${moddir}/firstboot.target" "${systemdsystemunitdir}/firstboot.target"
inst_simple "${moddir}/firstboot-detect" "/usr/bin/firstboot-detect"
$SYSTEMCTL -q --root "$initdir" enable firstboot-detect.service
inst_multiple awk grep mount
if [ "${DRACUT_ARCH:-$(uname -m)}" = "s390x" ]; then
# Special behaviour on s390x: On the first boot, enable all DASDs
inst_multiple chzdev
fi
# Work around https://github.com/systemd/systemd/pull/28718
mkdir -p "${initdir}/${systemdsystemunitdir}/initrd-parse-etc.service.d/"
echo -e "[Unit]\nConflicts=emergency.target" > "${initdir}/${systemdsystemunitdir}/initrd-parse-etc.service.d/emergency.conf"
}
07070100000008000081A400000000000000000000000167DD60B6000046AC000000000000000000000000000000000000001700000000combustion-1.5/LICENSE GNU GENERAL PUBLIC LICENSE
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07070100000009000081A400000000000000000000000167DD60B600000375000000000000000000000000000000000000001800000000combustion-1.5/MakefileFB_MODULEDIR ?= $(DESTDIR)/usr/lib/dracut/modules.d/30firstboot
MODULEDIR ?= $(DESTDIR)/usr/lib/dracut/modules.d/35combustion
all:
install-30firstboot:
install -Dm0644 30firstboot/module-setup.sh $(FB_MODULEDIR)/module-setup.sh
install -Dm0644 30firstboot/firstboot.target $(FB_MODULEDIR)/firstboot.target
install -Dm0755 30firstboot/firstboot-detect $(FB_MODULEDIR)/firstboot-detect
install -Dm0644 30firstboot/firstboot-detect.service $(FB_MODULEDIR)/firstboot-detect.service
install: install-30firstboot
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
.PHONY: all install install-30firstboot
0707010000000A000081A400000000000000000000000167DD60B60000243F000000000000000000000000000000000000001900000000combustion-1.5/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 source of configuration is a script file, most commonly using sh or bash.
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.
There are multiple ways to provide the configuration. In order of priority:
### combustion.url kernel parameter
The kernel cmdline can be used to specify a URL like `combustion.url=http://server/config/script`.
The script is downloaded using curl, so various protocols are available.
### QEMU fw_cfg
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
### VMware guestinfo
If the VMware guestinfo parameter "guestinfo.combustion.script" is set and
nonempty, it is treated as a base64 encoded gzipped script.
### Config drive
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.
All-uppercase labels are accepted as well. Alternatively, if a KIWI selfinstall
.iso is used for deployment (LABEL "INSTALL"), this is used as a 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
```
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$TAHEchlU.h2tvfOpOki54NaHpGYKwdNhjaBuSpDotD7' | chpasswd -e
# Add a public ssh key and enable sshd
mkdir -pm700 /root/.ssh/
cat id_rsa_new.pub >> /root/.ssh/authorized_keys
systemctl enable sshd.service
# Install vim-small
zypper --non-interactive install vim-small
# Leave a marker
echo "Configured with combustion" > /etc/issue.d/combustion
# Close outputs and wait for tee to finish.
exec 1>&- 2>&-; wait;
```
Perform modifications in the initrd environment
-----------------------------------------------
Using the `# combustion: prepare` marker, the initrd environment can be modified
for instance to perform tasks before `/sysroot` is mounted or to write
NetworkManager connection configuration into
`/etc/NetworkManager/system-connections/`. If the marker is present, the script
is invoked with `--prepare` as parameter from `combustion-prepare.service`, in
addition to the main invocation inside the transaction later.
Example:
```bash
#!/bin/bash
# combustion: network prepare
set -euxo pipefail
nm_config() {
umask 077 # Required for NM config
mkdir -p /etc/NetworkManager/system-connections/
cat >/etc/NetworkManager/system-connections/static.nmconnection <<-EOF
[connection]
id=static
type=ethernet
autoconnect=true
[ipv4]
method=manual
dns=192.168.100.1
address1=192.168.100.42/24,192.168.100.1
EOF
}
if [ "${1-}" = "--prepare" ]; then
nm_config # Configure NM in the initrd
exit 0
fi
# Redirect output to the console
exec > >(exec tee -a /dev/tty0) 2>&1
nm_config # Configure NM in the system
curl example.com
# Leave a marker
echo "Configured with combustion" > /etc/issue.d/combustion
# Close outputs and wait for tee to finish.
exec 1>&- 2>&-; wait;
```
How it works
------------
### Firstboot detection
Combustion ships a `firstboot` dracut module which introduces `firstboot.target`
as well as a `firstboot-detect.service`. This service mounts `/sysroot/etc`
early in the initrd (in a private namespace, to not trigger `.mount` units and
dependencies out of order). It then checks for the following conditions:
* `combustion.firstboot` or `ignition.firstboot` are present on the kernel
cmdline
* `/etc/machine-id` does not exist in `/sysroot`. Note: Unlike systemd's
`ConditionFirstBoot`, this is not triggered by "uninitialized" in the
machine-id file or influcenced by `systemd.firstboot=` on the kernel cmdline.
If one of them applies, it enables and starts `firstboot.target`. It's
important that all units started by `firstboot.target` are effectively
ordered after `firstboot-detect.service` to prevent loops. Add some Before=
to `firstboot-detect.service` if necessary.
If any of the firstboot configuration mechanisms (combustion, ignition)
find a user specified config, they delete `/var/lib/YaST2/reconfig_system`.
The result is that if (and only if) no configuration for those was provided,
the file still exists in the real system and triggers interactive setup
(jeos-firstboot, YaST Firstboot) if present.
The final system eventually reaches `first-boot-complete.target` and after that
`systemd-machine-id-commit.service`, which commits `/etc/machine-id` to disk and
thus `firstboot-detect.service` no longer triggers `firstboot.target` on
subsequent boots.
### Combustion
The `combustion` dracut module is included by default, but omitted if dracut is
run on an already configured system in `hostonly` mode.
`firstboot.target` pulls in `combustion.service` and
`combustion-prepare.service`. The latter runs after the config drive or
QEMU fw_cfg blob appears (see `combustion.rules` for details). The combustion
configuration is copied from the config source into `/dev/shm/combustion/config`
(this is accessible in `transactional-update shell` later). If the script
contains the `prepare` flag, it's executed now with the `--prepare` option. If
the `network` flag is present, networking is enabled in the initrd. 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.
Now, `initrd-parse-etc.service` can evaluate the final `/sysroot/etc/fstab` and
create the matching `sysroot-FOO.mount` units which are started before switching
into the root filesystem.
Automated Testing
-----------------
To test combustion, it has to be installed in the target system, a new initrd
built with it included (requires `--no-hostonly` or missing `/etc/machine-id`)
and then rebooted with some appropriate config source attached. That is
cumbersome even when using VMs, so there is some basic automated testing in
the test/ subdirectory.
Calling `test/test.sh` will download the latest MicroOS qcow2 image, build an
initrd with the combustion sources from the parent directory and perform some
basic tests. Currently this uses QEMU with three ways of providing a
config source and validates that the script was properly executes for each of
those.
This all happens in a temporary directory. To avoid having to redownload the
image for each `test.sh` run, it's possible to specify a less temporary
directory as parameter.
0707010000000B000081A400000000000000000000000167DD60B600002D7A000000000000000000000000000000000000001A00000000combustion-1.5/combustion#!/bin/bash
# SPDX-FileCopyrightText: 2023 SUSE LLC
# SPDX-License-Identifier: GPL-2.0-or-later
set -euo pipefail
config_mount="/run/combustion/mount"
# Use /dev/shm for data exchange
exchangedir="/dev/shm/combustion/"
config_dir="${exchangedir}/config"
get_combustion_url() {
(set +eu; . /lib/dracut-lib.sh; getarg combustion.url)
}
if [ "${1-}" = "--prepare" ]; then
rm -rf "${exchangedir}"
mkdir "${exchangedir}"
enable_network() {
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 "${hookdir}/pre-udev/60-net-genrules.sh" ]; then
# Wicked
. "${hookdir}/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
elif [ -e "${hookdir}/cmdline/99-nm-config.sh" ]; then
# NetworkManager
. "${hookdir}/cmdline/99-nm-config.sh"
else
echo "ERROR: unknown network framework" >&2
exit 1
fi
EOF
}
# Look at combustion.url first
if [ -n "$(get_combustion_url)" ]; then
echo "URL provided, downloading config later"
enable_network
exit 0
fi
# Try fw_cfg next
if [ -e "/sys/firmware/qemu_fw_cfg/by_name/opt/org.opensuse.combustion" ]; then
mkdir -p "${config_dir}"
if ! cp /sys/firmware/qemu_fw_cfg/by_name/opt/org.opensuse.combustion/script/raw \
"${config_dir}/script"; then
echo "Failed to copy script from fw_cfg!"
exit 1
fi
# TODO: Support other files, e.g. with a tarball or fs image?
fi
# Try VMware guestinfo next
if ! [ -d "${config_dir}" ] && [ "$(systemd-detect-virt)" = "vmware" ]; then
mkdir -p "${config_dir}"
# The exit code isn't really useful or documented. Print all errors and only treat
# a zero exit code + nonempty stdout as success.
echo "Trying vmware-rpctool"
if ! vmware-rpctool "info-get guestinfo.combustion.script" > "${config_dir}/script.gz.b64" \
|| ! [ -s "${config_dir}/script.gz.b64" ] \
|| ! base64 -d < "${config_dir}/script.gz.b64" | gzip -cd > "${config_dir}/script" \
|| ! [ -s "${config_dir}/script" ]; then
# vmware-rpctool failed or the script is empty
rm -f "${config_dir}/script.gz.b64" "${config_dir}/script"
rmdir "${config_dir}"
fi
rm -f "${config_dir}/script.gz.b64"
fi
# Try disks next - both lower and upper case
# "INSTALL" is used as label for KIWI selfinstall .isos. Try those as fallback.
for label in combustion COMBUSTION ignition IGNITION install INSTALL; do
[ -d "${config_dir}" ] && break
[ -e "/dev/disk/by-label/${label}" ] || continue
mkdir -p "${config_mount}"
if ! mount -o ro /dev/disk/by-label/${label} "${config_mount}"; then
echo "Failed to mount config drive!"
rmdir "${config_mount}"
exit 1
fi
if [ -d "${config_mount}/combustion" ]; then
if ! cp -R "${config_mount}/combustion" "${config_dir}"; then
echo "Failed to copy config!"
rm -rf "${config_dir}"
umount "${config_mount}"
rmdir "${config_mount}"
exit 1
fi
else
echo "No config found on drive."
fi
umount "${config_mount}"
rmdir "${config_mount}"
done
if ! [ -d "${config_dir}" ]; then
echo "No config source found"
exit 0
fi
if ! [ -e "${config_dir}/script" ]; then
echo "No config script found!"
exit 1
fi
chmod a+x "${config_dir}/script"
# Check for the magic flag "# combustion: prepare" in the script
if grep -qE '^# combustion:(.*)\<prepare\>' "${config_dir}/script"; then
# Run the script with the --prepare option
if ! (cd "${config_dir}"; exec ./script --prepare); then
echo "script --prepare failed with $?"
exit 1
fi
fi
# Note: In case ^ creates a NM config by writing to
# /etc/NetworkManager/system-connections/, nm-initrd-generator must not generate a
# default configuration anymore. This happens automatically since 1.36.0 (79885656d3).
# Check for the magic flag "# combustion: network" in the script
if grep -qE '^# combustion:(.*)\<network\>' "${config_dir}/script"; then
enable_network
fi
exit 0
fi
# Set by combustion.service but not ignition-kargs-helper.
# Controls whether config is actually completed by this step,
# triggering deletion of /var/lib/YaST2/reconfig_system
complete=0
if [ "${1-}" = "--complete" ]; then
complete=1
fi
delete_resolv_conf=0
cleanup() {
rm -rf "${exchangedir}" || true
if [ "${delete_resolv_conf}" -eq 1 ]; then
rm -f /sysroot/etc/resolv.conf || true
fi
if findmnt /sysroot >/dev/null; then
# zypper (both from t-u's selfupdate as well as the script)
# uses gpg which starts gpg-agent in the background. This keeps
# /sysroot busy, so we'll have to stop those.
while pkill -x gpg-agent; do sleep 0.5; done
# umount and remount so that the new default subvol is used
umount -R /sysroot
# Manual umount confuses systemd sometimes because it's async and the
# .mount unit might still be active when the "start" is queued, making
# it a noop, which ultimately leaves /sysroot unmounted
# (https://github.com/systemd/systemd/issues/20329). To avoid that,
# wait until systemd processed the umount events. In a chroot (or with
# SYSTEMD_OFFLINE=1) systemctl always succeeds, so avoid an infinite loop.
if ! systemctl --quiet is-active does-not-exist.mount; then
while systemctl --quiet is-active sysroot.mount; do sleep 0.5; done
fi
fi
if grep -w /sysroot /proc/*/mountinfo 2>/dev/null; then
echo "Warning: /sysroot still mounted somewhere"
fi
systemctl start sysroot.mount
}
# Note: The /sysroot remounting during cleanup happens unconditionally.
# This is needed as ignition-mount.service's ExecStop is also disabled unconditionally.
trap cleanup EXIT
# Compatibility for ignition-kargs-helper, which drops a script into
# "/run/combustion/mount/combustion" and then calls combustion
if [ -d "${config_mount}/combustion" ]; then
rm -rf "${config_dir}"
mkdir -p "${exchangedir}"
cp -R "${config_mount}/combustion" "${config_dir}"
chmod a+x "${config_dir}/script"
fi
# Download and use a script from the given URL
combustion_url="$(get_combustion_url)" || :
if ! [ -d "${config_dir}" ] && [ -n "${combustion_url}" ]; then
echo "Downloading config..."
mkdir -p "${config_dir}"
curl --globoff --location --retry 3 --retry-connrefused --fail --show-error --output "${config_dir}/script" -- "${combustion_url}"
chmod a+x "${config_dir}/script"
# Check for the magic flag "# combustion: prepare" in the script
if grep -qE '^# combustion:(.*)\<prepare\>' "${config_dir}/script"; then
# Run the script with the --prepare option
if ! (cd "${config_dir}"; exec ./script --prepare); then
echo "script --prepare failed with $?"
exit 1
fi
fi
fi
[ -d "${config_dir}" ] || exit 0
# 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
# Have to take care of x-initrd.mount first and from the outside, but skip /etc
# if it's the new nested subvolume mechanism
# Note: ignition-kargs-helper calls combustion but already mounted those itself.
awk '$1 !~ /^#/ && $4 ~ /(\<|,)x-initrd\.mount(\>|,)/ && ! ( $2 == "/etc" && $3 == "none" ) { if(system("findmnt /sysroot/" $2 " >/dev/null || mount --target-prefix /sysroot --fstab /sysroot/etc/fstab " $2) != 0) exit 1; }' /sysroot/etc/fstab
# Make sure the old snapshot is relabeled too, otherwise syncing its /etc fails.
(
set +eu
. /lib/dracut-lib.sh
set -eu
if [ -e "${hookdir}/pre-pivot/50-selinux-microos-relabel.sh" ]; then
NEWROOT=/sysroot bash -c '. /lib/dracut-lib.sh; . "${hookdir}/pre-pivot/50-selinux-microos-relabel.sh"'
elif [ -e /sysroot/.autorelabel ] || [ -e /sysroot/etc/selinux/.autorelabel ]; then
echo "ERROR: Relabel (probably) needed, but selinux-microos-relabel not found."
exit 1
fi
)
# Prepare chroot.
# Ideally this would just be --rbind /dev /sysroot/dev etc., but that has subtle downsides:
# By default, umount -R /sysroot would then propagate into the main /dev etc. and try to
# unmount /dev/shm/ etc. which must be avoided. Disabling mount propagation with
# --make-rslave interacts badly with other mount namespaces (used for PrivateMounts=true
# e.g. by systemd-udevd.service): The mounts propagate, but not all unmounts, leaving e.g.
# /sysroot/dev/shm/ mounted in udev's mnt context. To avoid all that, just bind mount
# everything individually, then it can be unmounted without caring about propagation.
# Alternatives are
# a) mount --bind --make-private /sysroot /sysroot on itself, but then e.g. udev doesn't
# see the same /sysroot as us
# b) Run combustion in its own mount namespace, but the needed redesign breaks some
# subtle interactions with the outside.
findmnt -nrvo TARGET | grep -E '^/(sys|proc|dev)(/|$)' | while read i; do
mount --bind "$i" "/sysroot/$i"
done
# 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 "${config_dir}"
./script
echo \$? > "${exchangedir}/retval"
# Snapshot got touched while the policy isn't active, needs relabeling again.
if [ -e /etc/selinux/.relabelled ]; then >> /etc/selinux/.autorelabel; fi
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
# If the mount options for /sysroot include subvol(id)=...,
# it would mount the old snapshot again. Override it.
# At this point, /sysroot is mounted so systemctl show returns the active mount options,
# not the configured ones. Use cat to get the configured ones instead.
if systemctl cat sysroot.mount | grep -q '\<subvol\(id\)\?='; then
# systemctl cat can't query a specific property, so work with the active options instead here...
rootopts="$(systemctl show -P Options sysroot.mount | sed -Ee 's/(^|,)subvol=[^,]*(,|$)//g;s/(^|,)subvolid=[^,]*(,|$)//g')"
# Apparently there is no better API?
newdefault=$(btrfs subvolume get-default /sysroot | sed -e 's/^.* path \([^[:space:]]*\).*$/\1/')
# Drop-ins in /etc have precedence over generated files in /run.
mkdir -p /etc/systemd/system/sysroot.mount.d/
cat > /etc/systemd/system/sysroot.mount.d/combustion-newsubvol.conf <<-EOF
[Mount]
Options=${rootopts},subvol=${newdefault}
EOF
systemctl daemon-reload # Unfortunately required for this :-/
fi
else
mount -o remount,rw /sysroot
if ! chroot /sysroot sh -e -c "cd '${config_dir}'; ./script"; then
echo "Command failed"
exit 1
fi
chroot /sysroot snapper --no-dbus create -d "After combustion configuration" --userdata "important=yes" || :
fi
if [ "${complete}" -eq 1 ]; then
rm -f /sysroot/var/lib/YaST2/reconfig_system
fi
exit 0
0707010000000C000081A400000000000000000000000167DD60B600000398000000000000000000000000000000000000002A00000000combustion-1.5/combustion-prepare.service[Unit]
Description=Combustion (preparations)
DefaultDependencies=false
# 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 may enable network services in the same way, so make sure the prepare
# script could write configiguration before networking is enabled.
Before=ignition-enable-network.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
[Service]
Type=oneshot
StandardOutput=journal+console
ExecStart=/usr/bin/combustion --prepare
0707010000000D000081A400000000000000000000000167DD60B600000958000000000000000000000000000000000000002000000000combustion-1.5/combustion.rules# SPDX-FileCopyrightText: 2024 SUSE LLC
# SPDX-License-Identifier: GPL-2.0-or-later
# It's not possible to wait for one of multiple devices to appear, so
# introduce a dev-combustion-config.device unit as alias to the actual device(s).
# This is only used for the .service dependencies.
# If combustion.url is specified, alias it to /dev/null to avoid waiting
# IMPORT has to be on its own as it returns success or not, even with "="...
IMPORT{cmdline}="combustion.url"
ACTION!="remove", SUBSYSTEM=="mem", ENV{DEVPATH}=="/devices/virtual/mem/null", ENV{combustion.url}!="", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config", TAG+="systemd"
# Filesystems with either combustion or ignition as label
ACTION!="remove", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="combustion", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
ACTION!="remove", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="COMBUSTION", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
ACTION!="remove", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="ignition", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
ACTION!="remove", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="IGNITION", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
# These can be used as config source as well, but they cannot be used as providers for
# /dev/combustion/config, as some other config source with higher priority might show up later.
#ACTION!="remove", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="install", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
#ACTION!="remove", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="INSTALL", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config"
# QEMU fw_cfg blob with key opt/org.opensuse.combustion
# There are add events for keys inside fw_cfg, but they are unreliable: https://github.com/systemd/systemd/issues/28638
# Using the platform device with add|bind does not work with TAG+="systemd" for some reason, so use the module...
ACTION!="remove", SUBSYSTEM=="module", KERNEL=="qemu_fw_cfg", TEST=="/sys/firmware/qemu_fw_cfg/by_name/opt/org.opensuse.combustion", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config", TAG+="systemd"
# VMware guestinfo value. Using sh allows PATH lookup traversal and checking for nonempty stdout without logging the value.
ACTION!="remove", DEVPATH=="/devices/virtual/misc/vmci", PROGRAM=="/bin/sh -c '[ $$(vmware-rpctool \"info-get guestinfo.combustion.script\" | wc -c) -gt 2 ]'", ENV{SYSTEMD_ALIAS}+="/dev/combustion/config", TAG+="systemd"
0707010000000E000081A400000000000000000000000167DD60B600000390000000000000000000000000000000000000002200000000combustion-1.5/combustion.service[Unit]
Description=Combustion
DefaultDependencies=false
# /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
# Without DefaultDependencies the target would be reached without us
Before=firstboot.target
Conflicts=initrd-switch-root.target umount.target
Conflicts=dracut-emergency.service emergency.service emergency.target
[Service]
Type=oneshot
ExecStart=/usr/bin/combustion --complete
[Install]
RequiredBy=firstboot.target
0707010000000F000081A400000000000000000000000167DD60B600000698000000000000000000000000000000000000001F00000000combustion-1.5/module-setup.shcheck() {
# Omit if building for this already configured system
if [[ $hostonly ]] && [ -e "${dracutsysrootdir}/etc/machine-id" ]; then
return 255
fi
return 0
}
depends() {
echo bash firstboot 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 pkill rmdir systemd-detect-virt wc
inst_multiple -o base64 gzip vmware-rpctool
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}/${systemdsystemunitdir}/dev-combustion-config.device.d/timeout.conf"
}
installkernel() {
# Modules for config sources
hostonly='' instmods ext4
# hostonly is fine here, only include them if they fit the current HW
instmods qemu_fw_cfg vmw_vsock_vmci_transport
}
07070100000010000041ED00000000000000000000000267DD60B600000000000000000000000000000000000000000000001400000000combustion-1.5/test07070100000011000081A400000000000000000000000167DD60B60000012F000000000000000000000000000000000000001F00000000combustion-1.5/test/config.ign{
"ignition": {
"version": "3.2.0"
},
"storage": {
"filesystems": [
{
"device": "/dev/disk/by-label/ROOT",
"format": "btrfs",
"mountOptions": [
"subvol=/@/home"
],
"path": "/home",
"wipeFilesystem": false
}
]
}
}
07070100000012000081ED00000000000000000000000167DD60B600002025000000000000000000000000000000000000001C00000000combustion-1.5/test/test.sh#!/bin/bash
set -euxo pipefail
# Some basic combustion testing:
# 1. Download the latest MicroOS image
# 2. Use its combustion to install the combustion to test and transfer kernel + initrd to the host using 9pfs
# 3. Revert the image to the original state and perform tests using the generated kernel + initrd
# Skip the generation of a new initrd with the changed combustion.
# Only useful when iterating this test script.
reuseinitrd=
if [ "${1-}" = "--reuseinitrd" ]; then
reuseinitrd=1
shift
fi
# Working dir which is also exposed to the VM through 9pfs.
# If not specified, create a temporary directory which is deleted on exit.
if [ -n "${1-}" ]; then
tmpdir="$(realpath "$1")"
else
tmpdir="$(mktemp -d)"
cleanup() {
rm -rf "$tmpdir"
}
trap cleanup EXIT
fi
QEMU_BASEARGS=(
# -accel tcg was here after -accel kvm but the fallback hid a weird bug
# that in GH actions only the first instance of QEMU was able to access /dev/kvm.
-accel kvm -nographic -m 1024
# Reading from stdin doesn't work, configure serial and monitor appropriately.
-chardev null,id=serial,logfile=/dev/stdout,logappend=on -serial chardev:serial -monitor none
-virtfs "local,path=${tmpdir},mount_tag=tmpdir,security_model=none")
# Prepare the temporary dir: Install combustion and copy resources.
testdir="$(dirname "$0")"
make -C "${testdir}/.." install "DESTDIR=${tmpdir}/install"
cp "${testdir}/"{testscript,config.ign} "${tmpdir}"
cd "$tmpdir"
cat >combustion-secondboot <<'EOF'
#!/bin/bash
set -euxo pipefail
exec &>/dev/ttyS0
echo "Combustion must not run on second boot"
SYSTEMD_IGNORE_CHROOT=1 poweroff -f
EOF
# Download latest MicroOS image
if ! [ -f openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2 ]; then
wget --progress=bar:force:noscroll https://download.opensuse.org/tumbleweed/appliances/openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2
qemu-img snapshot -c initial openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2
else
qemu-img snapshot -a initial openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2
fi
# First step: Use combustion in the downloaded image to generate an initrd with the new combustion.
if ! [ -n "${reuseinitrd}" ] || ! [ -e "${tmpdir}/vmlinuz" ] || ! [ -e "${tmpdir}/initrd" ]; then
rm -f "${tmpdir}/done"
cat >create-initrd <<'EOF'
#!/bin/bash
set -euxo pipefail
exec &>/dev/ttyS0
trap '[ $? -eq 0 ] || SYSTEMD_IGNORE_CHROOT=1 poweroff -f' EXIT
mount -t 9p -o trans=virtio tmpdir /mnt
# Install new combustion, make sure the old remnants are gone
rpm -e --nodeps --noscripts combustion
cp -av /mnt/install/usr /
cp /usr/lib/modules/$(uname -r)/vmlinuz /mnt/vmlinuz
dracut -f --no-hostonly /mnt/initrd
touch /mnt/done
umount /mnt
SYSTEMD_IGNORE_CHROOT=1 poweroff -f
EOF
timeout 300 qemu-system-x86_64 "${QEMU_BASEARGS[@]}" -drive if=virtio,file=openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2 \
-fw_cfg name=opt/org.opensuse.combustion/script,file=create-initrd
if ! [ -e "${tmpdir}/done" ]; then
echo "Initrd generation failed"
exit 1
fi
fi
# Test using a config drive
rm -f "${tmpdir}/done"
qemu-img snapshot -a initial openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2
mkdir -p configdrv/combustion/
cp testscript configdrv/combustion/script
mkdir -p configdrv/ignition/
cp config.ign configdrv/ignition/config.ign
/sbin/mkfs.ext4 -F -d configdrv -L ignition combustion.raw 16M
timeout 300 qemu-system-x86_64 "${QEMU_BASEARGS[@]}" -drive if=virtio,file=openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2 \
-kernel vmlinuz -initrd initrd -append "root=LABEL=ROOT console=ttyS0 quiet systemd.show_status=1 systemd.log_target=console systemd.journald.forward_to_console=1 rd.emergency=poweroff rd.shell=0" \
-drive if=virtio,file=combustion.raw
if ! [ -e "${tmpdir}/done" ]; then
echo "Test failed"
exit 1
fi
# Test fw_cfg with the test script
rm -f "${tmpdir}/done"
qemu-img snapshot -a initial openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2
timeout 300 qemu-system-x86_64 "${QEMU_BASEARGS[@]}" -drive if=virtio,file=openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2 \
-kernel vmlinuz -initrd initrd -append "root=LABEL=ROOT console=ttyS0 quiet systemd.show_status=1 systemd.log_target=console systemd.journald.forward_to_console=1 rd.emergency=poweroff rd.shell=0" \
-fw_cfg name=opt/org.opensuse.combustion/script,file=testscript
if ! [ -e "${tmpdir}/done" ]; then
echo "Test failed"
exit 1
fi
# Make sure it does not run on the second boot
rm -f "${tmpdir}/done"
timeout 300 qemu-system-x86_64 "${QEMU_BASEARGS[@]}" -drive if=virtio,file=openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2 \
-kernel vmlinuz -initrd initrd -append "root=LABEL=ROOT console=ttyS0 quiet systemd.show_status=1 systemd.log_target=console systemd.journald.forward_to_console=1 rd.emergency=poweroff rd.shell=0" \
-fw_cfg name=opt/org.opensuse.combustion/script,file=combustion-secondboot
if ! [ -e "${tmpdir}/done" ]; then
echo "Test failed"
exit 1
fi
# Test combustion.url using QEMU's builtin tftp server
rm -f "${tmpdir}/done"
qemu-img snapshot -a initial openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2
timeout 300 qemu-system-x86_64 "${QEMU_BASEARGS[@]}" -drive if=virtio,file=openSUSE-MicroOS.x86_64-kvm-and-xen.qcow2 \
-kernel vmlinuz -initrd initrd -append "root=LABEL=ROOT console=ttyS0 quiet systemd.show_status=1 systemd.log_target=console systemd.journald.forward_to_console=1 rd.emergency=poweroff rd.shell=0 combustion.url=tftp://10.0.2.2/testscript" \
-nic "user,tftp=$tmpdir"
if ! [ -e "${tmpdir}/done" ]; then
echo "Test failed"
exit 1
fi
# Now do some testing with Minimal-VM instead of MicroOS
# Download latest Minimal-VM image
if ! [ -f openSUSE-Tumbleweed-Minimal-VM.x86_64-kvm-and-xen.qcow2 ]; then
wget --progress=bar:force:noscroll https://download.opensuse.org/tumbleweed/appliances/openSUSE-Tumbleweed-Minimal-VM.x86_64-kvm-and-xen.qcow2
qemu-img snapshot -c initial openSUSE-Tumbleweed-Minimal-VM.x86_64-kvm-and-xen.qcow2
else
qemu-img snapshot -a initial openSUSE-Tumbleweed-Minimal-VM.x86_64-kvm-and-xen.qcow2
fi
# Use combustion in the downloaded image to generate an initrd with the new combustion.
if ! [ -n "${reuseinitrd}" ] || ! [ -e "${tmpdir}/vmlinuz-minimal" ] || ! [ -e "${tmpdir}/initrd-minimal" ]; then
rm -f "${tmpdir}/done"
cat >create-initrd-minimal <<'EOF'
#!/bin/bash
set -euxo pipefail
exec &>/dev/ttyS0
trap '[ $? -eq 0 ] || SYSTEMD_IGNORE_CHROOT=1 poweroff -f' EXIT
mount -t 9p -o trans=virtio tmpdir /mnt
# Install new combustion, make sure the old remnants are gone
rpm -e --nodeps --noscripts combustion
cp -av /mnt/install/usr /
cp /usr/lib/modules/$(uname -r)/vmlinuz /mnt/vmlinuz-minimal
dracut -f --no-hostonly /mnt/initrd-minimal
touch /mnt/done
umount /mnt
SYSTEMD_IGNORE_CHROOT=1 poweroff -f
EOF
timeout 300 qemu-system-x86_64 "${QEMU_BASEARGS[@]}" -drive if=virtio,file=openSUSE-Tumbleweed-Minimal-VM.x86_64-kvm-and-xen.qcow2 \
-fw_cfg name=opt/org.opensuse.combustion/script,file=create-initrd-minimal
if ! [ -e "${tmpdir}/done" ]; then
echo "Initrd generation failed"
exit 1
fi
fi
# Test combustion.url using QEMU's builtin tftp server
rm -f "${tmpdir}/done"
qemu-img snapshot -a initial openSUSE-Tumbleweed-Minimal-VM.x86_64-kvm-and-xen.qcow2
timeout 300 qemu-system-x86_64 "${QEMU_BASEARGS[@]}" -drive if=virtio,file=openSUSE-Tumbleweed-Minimal-VM.x86_64-kvm-and-xen.qcow2 \
-kernel vmlinuz-minimal -initrd initrd-minimal -append "root=LABEL=ROOT rw console=ttyS0 quiet systemd.show_status=1 systemd.log_target=console systemd.journald.forward_to_console=1 rd.emergency=poweroff rd.shell=0 combustion.url=tftp://10.0.2.2/testscript" \
-nic "user,tftp=$tmpdir"
if ! [ -e "${tmpdir}/done" ]; then
echo "Test failed"
exit 1
fi
# Make sure it does not run on the second boot
rm -f "${tmpdir}/done"
timeout 300 qemu-system-x86_64 "${QEMU_BASEARGS[@]}" -drive if=virtio,file=openSUSE-Tumbleweed-Minimal-VM.x86_64-kvm-and-xen.qcow2 \
-kernel vmlinuz-minimal -initrd initrd-minimal -append "root=LABEL=ROOT rw console=ttyS0 quiet systemd.show_status=1 systemd.log_target=console systemd.journald.forward_to_console=1 rd.emergency=poweroff rd.shell=0 combustion.url=tftp://10.0.2.2/combustion-secondboot" \
-nic "user,tftp=$tmpdir"
if ! [ -e "${tmpdir}/done" ]; then
echo "Test failed"
exit 1
fi
07070100000013000081A400000000000000000000000167DD60B6000004AA000000000000000000000000000000000000001F00000000combustion-1.5/test/testscript#!/bin/bash
# combustion: prepare network
set -euxo pipefail
exec &>/dev/ttyS0
# Poweroff immediately on any failure to avoid unnecessary waiting.
trap '[ $? -eq 0 ] || SYSTEMD_IGNORE_CHROOT=1 poweroff -f' EXIT
if [ "${1-}" = "--prepare" ]; then
# Verify that the udev rules work for all config sources and avoid
# the timeout on boot.
if ! systemctl is-active dev-combustion-config.device; then
echo "FAILED: timeout"
exit 1
fi
exit 0
fi
echo root:linux | chpasswd
curl example.com
echo "Configured with combustion" > /etc/issue.d/combustion
# Make sure that the system comes up good, leave a marker in the shared FS
# and power off the VM.
cat >>/usr/bin/combustion-validate <<'EOF'
#!/bin/bash
set -euxo pipefail
exec &>/dev/ttyS0
trap '[ $? -eq 0 ] || poweroff -f' EXIT
if journalctl --no-pager | grep "/sysroot still mounted somewhere"; then
exit 1
fi
mount -t 9p -o trans=virtio tmpdir /mnt
touch /mnt/done
umount /mnt
poweroff -f
EOF
chmod a+x /usr/bin/combustion-validate
cat >>/etc/systemd/system/combustion-validate.service <<'EOF'
[Service]
ExecStart=/usr/bin/combustion-validate
[Install]
RequiredBy=default.target
EOF
systemctl enable combustion-validate.service
07070100000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000B00000000TRAILER!!!124 blocks
