This is expected behavior.
Since /tmp is a tmpfs by default, the default
/usr/lib/tmpfiles.d/tmp.conf is configured with a 10d cleanup age for
/tmp, but it is *not* configured to clean /tmp at boot, because that is
unnecessary for a tmpfs.
If you want to clean /tmp at boot *and* have your tmp.mount override,
you need to also override tmpfiles.d/tmp.conf with appropriate settings
for /tmp and /var/tmp (because both of these are listed in the default
tmp.conf).
** Changed in: systemd (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2080972
Title:
/tmp as non-tmpfs doesn't get cleaned upon reboot
Status in systemd package in Ubuntu:
Invalid
Bug description:
On Oracular, it seems `/tmp` doesn't get cleaned on reboot, when the
`/etc/systemd/system/tmp.mount` file is present.
Reproducer:
$ wget
https://cloud-images.ubuntu.com/minimal/daily/oracular/20240913/oracular-minimal-cloudimg-amd64.img
$ qemu-img resize oracular-minimal-cloudimg-amd64.img +20G
$ cat >user-data <<EOF
#cloud-config
password: ubuntu
chpasswd: { expire: False }
ssh_pwauth: True
EOF
$ cloud-localds user-data.img user-data
$ kvm -m 2G -smp 2 -hda oracular-minimal-cloudimg-amd64.img -hdb user-data.img
In the VM, logged in with `ubuntu`/`ubuntu`:
$ sudo touch /etc/systemd/system/tmp.mount
$ df -h | grep '/tmp' # you can verify that /tmp is a tmpfs, because this is
the default now
$ sudo systemctl reboot
# Wait for reboot, then login again
$ echo Hello there >/tmp/will_stay
$ df -h | grep '/tmp' # you can verify that /tmp is not a tmpfs anymore
$ sudo systemctl reboot
# Wait for reboot again, then login again
$ cat /tmp/will_stay
Hello there
At least our auto-upgrade-testing tooling relies on `/tmp` getting cleaned
upon reboot, and as a user, this is what I expect too.
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