oslogin_trustedca.pub causes etckeeper with bzr backend to fail

[hloeung]

Hi,

Since #222 landed and released as part of google-guest-agent 20231004.02-0ubuntu1~20.04.3, we've started to notice that etckeeper is failing. The issue is with when etckeeper is configured to use the bzr / bazaar backend and fails as follows:

/etc/cron.daily/etckeeper:
skipping /etc/ssh/oslogin_trustedca.pub (can't add file of kind 'fifo')
bzr: ERROR: No changes to commit. Please 'bzr add' the files you want to commit, or use --unchanged to force an empty commit.
run-parts: /etc/cron.daily/etckeeper exited with return code 3

ubuntu@juju-9b9b35-2:~$ ls -la /etc/ssh/oslogin_trustedca.pub
prw-r--r-- 1 root root 0 Jan 10 14:42 /etc/ssh/oslogin_trustedca.pub

Any chance we could revisit the location to this named pipe? Perhaps a better location for it would be under /run as it isn't configuration related?

Having it under /run also aligns with the rest of the system, e.g.:

ubuntu@juju-9b9b35-2:/$ sudo find / -type p -ls
5 0 p--------- 1 ubuntu ubuntu 0 Mar 4 20:42 /run/user/1000/inaccessible/fifo
65 0 prw------- 1 root root 0 Aug 30 2023 /run/initctl
664 0 prw-rw-rw- 1 root root 0 Aug 30 2023 /run/cloud-init/hook-hotplug-cmd
788 0 prw------- 1 root root 0 Aug 30 2023 /run/systemd/inhibit/1.ref
309324 0 prw------- 1 root root 0 Mar 4 20:42 /run/systemd/sessions/41381.ref
8 0 p--------- 1 root root 0 Aug 30 2023 /run/systemd/inaccessible/fifo
18915 0 prw-r--r-- 1 root root 0 Jan 10 14:42 /etc/ssh/oslogin_trustedca.pub
ubuntu@juju-9b9b35-2:/$

Thanks!