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For redeploying the rootfs
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Original file line number | Diff line number | Diff line change |
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#!/bin/bash | ||
set -euo pipefail | ||
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rootmnt=/mnt/rootfs | ||
mkdir -p $rootmnt | ||
mount /dev/disk/by-label/root $rootmnt | ||
igntmp=/run/ignition-rootfs | ||
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case "${1:-}" in | ||
save) | ||
for toplevel in boot ostree; do | ||
mkdir -p ${igntmp}/${toplevel} | ||
chcon -h --reference=${rootmnt}/${toplevel} ${igntmp}/${toplevel} | ||
done | ||
# We copy the repo, /var and the .origin file; if we tried to copy | ||
# everything with e.g. `cp` we'd end up breaking hardlinks. | ||
repo=${igntmp}/ostree/repo | ||
ostree --repo=${repo} init --mode=bare | ||
cp ${rootmnt}/ostree/repo/config ${repo}/config | ||
ostree --repo=${repo} pull-local ${rootmnt}/ostree/repo | ||
stateroot=$(ls ${rootmnt}/ostree/deploy) | ||
statepath=ostree/deploy/${stateroot} | ||
mkdir -p ${igntmp}/${statepath} | ||
cp -a ${rootmnt}/${statepath}/var ${igntmp}/${statepath}/var | ||
mkdir -p ${igntmp}/${statepath}/deploy | ||
cp -a ${rootmnt}/${statepath}/deploy/*.origin ${igntmp}/${statepath}/deploy/ | ||
commit=$(cd ${stateroot} && ls *.0 | cut -f 1 -d '.') | ||
echo "${commit}" > ${igntmp}/ostree-commit | ||
;; | ||
restore) | ||
echo "Restoring ostree repo..." | ||
mv -T ${igntmp}/ostree ${rootmnt}/ostree | ||
echo "...done" | ||
commit=$(cat ${igntmp}/ostree-commit) | ||
echo "Redeploying OSTree commit ${commit} ..." | ||
ostree admin --sysroot=${rootmnt} deploy ${commit} | ||
;; | ||
*) | ||
echo "Unsupported operation: ${1:-}" | ||
;; | ||
esac |
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Original file line number | Diff line number | Diff line change |
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#!/bin/bash | ||
set -euo pipefail | ||
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rootmnt=/sysroot | ||
tmproot=/run/ignition-rootfs | ||
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case "${1:-}" in | ||
detect) | ||
# This is obviously crude; perhaps in the future we could change ignition's `fetch` | ||
# stage to write out a file if the rootfs is being replaced or so. But eh, it | ||
# works for now. | ||
has_rootfs=$(jq '.storage?.filesystems? // [] | map(select(.label == "root")) | length' < /run/ignition.json) | ||
if [ "${has_rootfs}" = "0" ]; then | ||
exit 0 | ||
fi | ||
echo "Detected rootfs replacement in fetched Ignition config: /run/ignition.json" | ||
mkdir "${tmproot}" | ||
;; | ||
save) | ||
# This one is in a private mount namespace since we're not "offically" mounting | ||
mount /dev/disk/by-label/root $rootmnt | ||
echo "Moving rootfs to RAM..." | ||
# OSTree added the immutable bit on the deployment root, and | ||
# cosa's create_disk added it to the rootfs | ||
chattr -i ${rootmnt} ${rootmnt}/ostree/deploy/*/deploy/*.0 | ||
for x in boot ostree; do | ||
# TODO; copy instead of mv to avoid writes, since we're just | ||
# about to blow away the whole FS anyways? | ||
mv -Tn ${rootmnt}/${x} ${tmproot}/${x} | ||
done | ||
umount ${rootmnt} | ||
echo "Moved rootfs to RAM, pending redeployment: ${tmproot}" | ||
;; | ||
restore) | ||
# This one is in a private mount namespace since we're not "offically" mounting | ||
mount /dev/disk/by-label/root $rootmnt | ||
echo "Restoring rootfs from RAM..." | ||
for x in boot ostree; do | ||
mv -Tn ${tmproot}/${x} ${rootmnt}/${x} | ||
done | ||
# And restore the immutable bits | ||
chattr +i ${rootmnt}/ostree/deploy/*/deploy/*.0 ${rootmnt} | ||
echo "...done" | ||
umount $rootmnt | ||
;; | ||
*) | ||
echo "Unsupported operation: ${1:-}" | ||
;; | ||
esac |
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[Unit] | ||
Description=Ignition OSTree: detect rootfs replacement | ||
DefaultDependencies=false | ||
After=ignition-fetch.service | ||
Before=ignition-disks.service | ||
Before=initrd-root-fs.target | ||
Before=sysroot.mount | ||
ConditionKernelCommandLine=ostree | ||
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# This stage requires udevd to detect disks | ||
Requires=systemd-udevd.service | ||
After=systemd-udevd.service | ||
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[Service] | ||
Type=oneshot | ||
RemainAfterExit=yes | ||
EnvironmentFile=/run/ignition.env | ||
ExecStart=/usr/libexec/ignition-dracut-rootfs detect |
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Original file line number | Diff line number | Diff line change |
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[Unit] | ||
Description=Ignition OSTree: restore rootfs | ||
DefaultDependencies=false | ||
After=ignition-disks.service | ||
Before=sysroot.mount | ||
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ConditionKernelCommandLine=ostree | ||
ConditionPathIsDirectory=/run/ignition-rootfs | ||
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[Service] | ||
Type=oneshot | ||
RemainAfterExit=yes | ||
EnvironmentFile=/run/ignition.env | ||
# So we can transiently mount sysroot | ||
MountFlags=slave | ||
ExecStart=/usr/libexec/ignition-dracut-rootfs restore |
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[Unit] | ||
Description=Ignition OSTree: save rootfs | ||
DefaultDependencies=false | ||
After=ignition-rootfs-detect.service | ||
Before=ignition-disks.service | ||
ConditionKernelCommandLine=ostree | ||
ConditionPathIsDirectory=/run/ignition-rootfs | ||
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[Service] | ||
Type=oneshot | ||
RemainAfterExit=yes | ||
EnvironmentFile=/run/ignition.env | ||
# So we can transiently mount sysroot | ||
MountFlags=slave | ||
ExecStart=/usr/libexec/ignition-dracut-rootfs save |
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#!/bin/bash | ||
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*- | ||
# ex: ts=8 sw=4 sts=4 et filetype=sh | ||
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depends() { | ||
echo ignition ostree | ||
} | ||
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install_ignition_unit() { | ||
local unit="$1"; shift | ||
local target="${1:-ignition-complete.target}"; shift | ||
local instantiated="${1:-$unit}"; shift | ||
inst_simple "$moddir/$unit" "$systemdsystemunitdir/$unit" | ||
mkdir -p "$initdir/$systemdsystemunitdir/$target.requires" | ||
ln_r "../$unit" "$systemdsystemunitdir/$target.requires/$instantiated" | ||
} | ||
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install() { | ||
inst_multiple ostree tar chattr jq | ||
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inst_script "$moddir/ignition-dracut-rootfs.sh" \ | ||
"/usr/libexec/ignition-dracut-rootfs" | ||
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install_ignition_unit ignition-rootfs-detect.service | ||
install_ignition_unit ignition-rootfs-save.service | ||
install_ignition_unit ignition-rootfs-restore.service | ||
} |