Thank you for taking the time to report this bug and helping to make
Ubuntu better.
I tried to reproduce this behavior in a Ubuntu 22.04 VM (initramfs-tools
0.140ubuntu13.1, zstd 1.4.8+dfsg-3build1), but `lsinitramfs
/boot/initrd.img` worked. Can you still reproduce the failure?
** Changed in: initramfs-tools (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1999881
Title:
unmkinitramfs fails with symlinked zstd compressed initrds
Status in initramfs-tools package in Ubuntu:
Incomplete
Bug description:
[Impact]
* Cannot unpack zstd compressed initrds when accessed through a
symbolic link
[Test Case]
$ grep COMPRESS= /etc/initramfs-tools/initramfs.conf
COMPRESS=zstd
# This is the default
$ stat -c '%F %N' /boot/initrd.img*
symbolic link '/boot/initrd.img' -> 'initrd.img-5.15.0-53-generic'
regular file '/boot/initrd.img-5.15.0-53-generic'
$ lsinitramfs /boot/initrd.img-5.15.0-53-generic
... works as expected ...
$ lsinitramfs /boot/initrd.img
cpio: premature end of archive
[Regression Potential]
* Ubuntu Jammy changes the default compression scheme for the initrd
from lz4 to zstd. Unpacking lz4 initrds had already been fixed by
https://bugs.launchpad.net/ubuntu/cosmic/+source/initramfs-
tools/+bug/1832108 but unpacking zstd initrds works as expected when
directly accessing the file. However, it fails when accessing it
through a symbolic link.
[Other Info]
A fix proposal is attached.
$ lsb_release -rd
Description: Ubuntu 22.04.1 LTS
Release: 22.04
$ dpkg-query -W initramfs-tools
initramfs-tools 0.140ubuntu13
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