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Avoid updating the initramfs twice for some cases

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When installing/upgrading packages (e. g. a kernel and initramfs-tools),
the same initrd is generated twice:

```
$ apt-get install --no-install-recommends -y zstd initramfs-tools linux-image-generic
[...]
Setting up initramfs-tools-core (0.146) ...
Setting up initramfs-tools (0.146) ...
update-initramfs: deferring update (trigger activated)
Setting up linux-image-6.12.20-amd64 (6.12.20-1) ...
I: /vmlinuz.old is now a symlink to boot/vmlinuz-6.12.20-amd64
I: /initrd.img.old is now a symlink to boot/initrd.img-6.12.20-amd64
I: /vmlinuz is now a symlink to boot/vmlinuz-6.12.20-amd64
I: /initrd.img is now a symlink to boot/initrd.img-6.12.20-amd64
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-6.12.20-amd64
Setting up linux-image-amd64 (6.12.20-1) ...
Processing triggers for initramfs-tools (0.146) ...
update-initramfs: Generating /boot/initrd.img-6.12.20-amd64
```

Remember the timestamp when the dpkg trigger is set in the file
`/run/update-initramfs.dpkg-trigger`. Then only update the initramfs if
it is not newer than the time the trigger was created.

This will solve the example given above:

```
$ apt-get install --no-install-recommends -y zstd initramfs-tools linux-image-generic
[...]
Setting up initramfs-tools-core (0.146) ...
Setting up initramfs-tools (0.146) ...
update-initramfs: deferring update (trigger activated)
Setting up linux-image-6.12.20-amd64 (6.12.20-1) ...
I: /vmlinuz.old is now a symlink to boot/vmlinuz-6.12.20-amd64
I: /initrd.img.old is now a symlink to boot/initrd.img-6.12.20-amd64
I: /vmlinuz is now a symlink to boot/vmlinuz-6.12.20-amd64
I: /initrd.img is now a symlink to boot/initrd.img-6.12.20-amd64
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-6.12.20-amd64
Setting up linux-image-amd64 (6.12.20-1) ...
Processing triggers for libc-bin (2.41-6) ...
Processing triggers for initramfs-tools (0.146) ...
update-initramfs: /boot/initrd.img-6.12.20-amd64 has already been updated since Tue Mar 25 11:48:49 2025.
```

This approach will not help, when the update-initramfs trigger is set by
another package (e. g. clevis-initramfs). That would need support from
the dpkg trigger (see Debian bug #1099136).

LP: #1466965
This commit is contained in:
Benjamin Drung 2025-03-25 12:49:23 +01:00
parent 40694280ef
commit 7f2ed354cc
2 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
debian/initramfs-tools.postinst vendored
View File

@ -7,8 +7,13 @@ if [ "x$1" != xtriggered ]; then
# this activates the trigger, if triggers are working
update-initramfs -u
else
# force it to actually happen
DPKG_MAINTSCRIPT_PACKAGE='' update-initramfs -u
# The /run/update-initramfs.dpkg-trigger file is just a workaround.
# The timestamp should be provided directly by the dpkg trigger.
# See https://bugs.debian.org/1099136
timestamp=$(stat -c %Y /run/update-initramfs.dpkg-trigger 2>/dev/null || true)
# force it to actually happen (if not already updated since activation)
DPKG_MAINTSCRIPT_PACKAGE='' update-initramfs -u -s "$timestamp"
rm -f /run/update-initramfs.dpkg-trigger
fi
#DEBHELPER#

4
update-initramfs
View File

@ -14,6 +14,10 @@ set -e
if [ -n "$DPKG_MAINTSCRIPT_PACKAGE" ] && [ $# = 1 ] && [ "$1" = -u ]; then
if dpkg-trigger --no-await update-initramfs; then
echo "update-initramfs: deferring update (trigger activated)"
# The /run/update-initramfs.dpkg-trigger file is just a workaround.
# The timestamp should be provided directly by the dpkg trigger.
# See https://bugs.debian.org/1099136
touch /run/update-initramfs.dpkg-trigger
exit 0
fi
fi