add_mountroot_fail_hook uses wrong target name

[Roland Kaufmann]

Upon boot of a system that uses LVM2 you get the message:

ln: /tmp/mountroot-fail-hooks.d//scripts/init-premount/lvm2: No such file or directory

This is because the script /usr/share/initramfs-tools/scripts/init-premount/lvm2 uses the add_mountroot_fail_hook function from /usr/share/initramfs-tools/scripts/functions (which is sources right before), but this function contains a bug that takes the full path of the source script instead of the given argument as name for the target.

Version of Ubuntu: 20.04 LTS
Version of initramfs-tools: 0.136ubuntu6

For a live installation, this may be fixed with (all on one line):

sudo sed -i 's,\(ln -s "\$0" /tmp/mountroot-fail-hooks\.d/\)"\$0",\1"\$1",' /usr/share/initramfs-tools/scripts/functions && sudo update-initramfs -u

and verified by checking that this message now disappears on next boot:

sudo journalctl -b | grep mountroot-fail-hooks

A proposed patch for the source distribution is attached.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "Proposed fix" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Benjamin Drung (bdrung)]

This particular bug has already been reported and is a duplicate of bug #1871154, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.