Bug#1074789: daemon-rexec no longer reopens /run/systemd/userdb/io.systemd.DynamicUser

[Michael Biebl]

Am 20.07.24 um 17:44 schrieb Michael Biebl:
> Am 20.07.24 um 17:40 schrieb Michael Biebl:
>> Am 20.07.24 um 17:36 schrieb Michael Biebl:
>>> Btw, I vaguely remember successfully testing dist-upgrades of a GNOME 
>>> installation from bullseye to bookworm. So I suspect this was broken 
>>> by one of the latest stable updates
>>
>> Just tested this by upgrading
>> 247.3-7+deb11u4 → 252.6-1 (snapshots.d.o) → systemd listens on the 
>> socket after the upgrade
>>
>> 247.3-7+deb11u4 → 252.26-1~deb12u2 (bookworm) → systemd *does not* 
>> listen on the socket after the upgrade
> 
> Given that these bug reports started popping up only recently, my guess 
> is that it's one of the more recent systemd stable updates like 
> 252.26-1~deb12u2 which regressed.

git bisect shows 
https://github.com/systemd/systemd-stable/commit/a5fd23650dc as the 
first faulty commit:


core/varlink: make sure we setup non-serialized varlink sockets

Before this PR, if m->varlink_server is not yet set up during
deserialization, we call manager_setup_varlink_server rather than
manager_varlink_init, the former of which doesn't setup varlink
addresses, but only binds to methods. This results in that
newly-added varlink addresses not getting created if deserialization
takes place.

Therefore, let's switch to manager_varlink_init, and add some
sanity checks to it in order to prevent listening on the same
address twice.


Reverting that fixes daemon-reexec on upgrades.
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