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fix(flavors): regen initramfs on live layer for casper (LP: #2146567)

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Seed installation diverts initramfs install hooks.
As we move base layers to dracut, casper is still needed
for the live layer.
This regenerates initrds after live layers install initramfs-tools, to
make casper work, in case the base layer was using dracut.
This commit is contained in:
Simon Poirier 2026-04-10 09:07:34 -04:00
parent 7126d85e23
commit 7ac1f7ceb2
9 changed files with 42 additions and 0 deletions
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live-build/edubuntu/hooks/03-initramfs-enforcement.chroot Symbolic link
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#!/bin/bash -ex
# vi: ts=4 noexpandtab
# In a kernel layer, we need a freshly updated initrd (to ensure it
# has been casperized with an appropriate config). A binary hook will
# pull this out to be a separate build artifact to eventually end up
# in /casper on the generated ISO.
# In all lower layers, having an initrd just wastes space, as curtin
# will always call update-initramfs after the layer has been copied to
# the target system.
# The netboot "layers" are not made into squashfses so there's no need
# to do anything in those.
case $PASS in
minimal.standard.live)
;;
*)
rm -f /boot/initrd.img-*
exit 0
;;
esac
cat <<EOF > /etc/initramfs-tools/conf.d/casperize.conf
export CASPER_GENERATE_UUID=1
EOF
cat <<EOF > /etc/initramfs-tools/conf.d/default-layer.conf
LAYERFS_PATH=${PASS}.squashfs
EOF
# As this hook has deleted the initrds from lower layers we need to
# pass -c -k all to update-initramfs here (-u will do nothing)
update-initramfs -c -k all