Rocker Zhang
1bd2acf193
Regression coverage for the soft-reboot linger bug fixed in
9f25feb4ed ("logind: keep lingering users at startup-time GC", #41789):
a lingering user's user@.service was started after a hardware reboot but
not after `systemctl soft-reboot`, because logind GC'd the user at
startup before user_start() ran.
On the first boot, enable lingering for the pre-existing testuser and
wait for its user@UID.service to come up. After the first soft-reboot
(which keeps the same persistent rootfs), assert the service is active
again — this is the regression check. Disable lingering again before the
nextroot switch in the second boot so the lingering user doesn't leak
into the later boots' minimal overlay rootfs.
Verified locally in a qemu/KVM VM: passes with the fix present, and with
the fix reverted the second-boot assertion times out (the lingering user
is GC'd in logind startup and user@UID.service never comes back),
confirming the test exercises the bug.
Co-developed-by: Claude Opus 4.7 <noreply@anthropic.com>
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