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race-condition between wireplumber and pipewire-pulse

  • PipeWire version (pipewire --version): pipewire 0.3.58 and wireplumber 0.4.11
  • Distribution and distribution version (PRETTY_NAME from /etc/os-release): Debian GNU/Linux bookworm/sid

Description of Problem:

For context, Debian packages don't use pipewire-media-session.service alias in pipewire-pulse.service [1] and wireplumber.service [2] as a workaround to a bug in systemd not correctly managing alias [3].

As reported on Debian https://bugs.debian.org/1019944#33, a race condition could still happen between wireplumber and pipewire-pulse. It has been mitigated by adding a session manager in Wants= and After= fields of pipewire-pulse.service in pipewire!970 (merged). This seemed to do the trick when aliases were in place. But, without aliases it seems pipewire-pulse.service can be ready before wireplumber.service.

The proposed solution not to have this race condition again seems to add sd_notify [4] to wireplumber and send a signal to systemd when it is set up correctly and have the wireplumber service wait for that signal (Type=notify).

How Reproducible:

Not reproducible by all users.