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Again in ubuntu-server builds, configure LAYERFS_PATH in the kernel layer and ensure the initrd is freshly regenerated in that layer. LAYERFS_PATH was being set to the layer below the kernel layer, which meant that the live session did not get access to all the modules in the case that the kernel had not been installed in the base layer, which in turn means that installs fail. (LP: #2100148)

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* Again in ubuntu-server builds, configure LAYERFS_PATH in the kernel layer
  and ensure the initrd is freshly regenerated in that layer. LAYERFS_PATH
  was being set to the layer below the kernel layer, which meant that the
  live session did not get access to all the modules in the case that the
  kernel had not been installed in the base layer, which in turn means that
  installs fail. (LP: #2100148)
* While we're at it, delete any initrd from any other layer than a kernel
  layer, as they just waste space on the ISO.
This commit is contained in:
Michael Hudson-Doyle 2025-02-27 12:29:00 +13:00
parent ff331b2d94
commit e814e02bf4
3 changed files with 45 additions and 21 deletions
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8
debian/changelog vendored
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@ -7,6 +7,14 @@ livecd-rootfs (25.04.20) UNRELEASED; urgency=medium
* In ubuntu-server builds, install the first kernel in the base layer, not
the "ga" kernel (which may not be installed at all, as is the case in e.g.
the arm64+largemem builds).
* Again in ubuntu-server builds, configure LAYERFS_PATH in the kernel layer
and ensure the initrd is freshly regenerated in that layer. LAYERFS_PATH
was being set to the layer below the kernel layer, which meant that the
live session did not get access to all the modules in the case that the
kernel had not been installed in the base layer, which in turn means that
installs fail. (LP: #2100148)
* While we're at it, delete any initrd from any other layer than a kernel
layer, as they just waste space on the ISO.
-- Michael Hudson-Doyle <michael.hudson@ubuntu.com> Thu, 27 Feb 2025 11:41:22 +1300

21
live-build/ubuntu-server/hooks/02-installer-bits.chroot_early
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@ -1,21 +0,0 @@
#!/bin/bash -ex
# vi: ts=4 noexpandtab
case $PASS in
ubuntu-server-minimal.ubuntu-server.installer.*)
exit 0
;;
ubuntu-server-minimal.ubuntu-server.installer)
;;
*)
exit 0
;;
esac
cat <<EOF > /etc/initramfs-tools/conf.d/casperize.conf
export CASPER_GENERATE_UUID=1
EOF
cat <<EOF > /etc/initramfs-tools/conf.d/default-layer.conf
LAYERFS_PATH=${PASS}.squashfs
EOF

37
live-build/ubuntu-server/hooks/03-initramfs-enforcement.chroot Executable file
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@ -0,0 +1,37 @@
#!/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 $PASS in
ubuntu-server-minimal.ubuntu-server.installer.*.*)
exit 0
;;
ubuntu-server-minimal.ubuntu-server.installer.*)
;;
*)
rm -f /boot/initrd.img*
exit 0
;;
esac
cat <<EOF > /etc/initramfs-tools/conf.d/casperize.conf
export CASPER_GENERATE_UUID=1
EOF
cat <<EOF > /etc/initramfs-tools/conf.d/default-layer.conf
LAYERFS_PATH=${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