[Bug 1969976] Re: DynamicUser=1 doesn't get along with services that need dbus-daemon

[Lukas Märdian]

Yes, I think we could create a new user for fwupd, similar to how it is
done in systemd-oomd.postinst (https://git.launchpad.net/~ubuntu-core-
dev/ubuntu/+source/systemd/tree/debian/systemd-oomd.postinst?h=ubuntu-
jammy) and then use a "User=fwupd" configuration in fwupd-
refresh.service.

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https://bugs.launchpad.net/bugs/1969976

Title:
  DynamicUser=1 doesn't get along with services that need dbus-daemon

Status in Fwupd:
  New
Status in systemd:
  New
Status in fwupd package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New
Status in fwupd source package in Focal:
  New
Status in systemd source package in Focal:
  New
Status in fwupd source package in Impish:
  New
Status in systemd source package in Impish:
  New
Status in fwupd source package in Jammy:
  New
Status in systemd source package in Jammy:
  New

Bug description:
  Updating to systemd 245.4-4ubuntu3.16 has caused a regression in
  Ubuntu 20.04, that fwupd-refresh.service always fails to run.

  This has been root caused down to the changes in
  https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1871538

  Unfortunately this is an upstream issue introduced by stable systemd.
  https://github.com/systemd/systemd/issues/22737

  The problem also occurs in Ubuntu 22.04 with a newer systemd release.
  As discussed in https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/1871538/comments/61 it's a tradeoff of issues.  So within Ubuntu something probably needs to be done about fwupd-refresh.service.

  One proposal is to remove DynamicUser=yes from the systemd unit, but
  this will mean fwupdgmr refresh runs as root.  It's relatively
  sandboxed by other security mechanisms, but still not ideal.  Could we
  repurpose any other service account?  Or alternatively we can make a
  new fwupd service account that this systemd unit uses.

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