[Bug 1772137] Re: networkd-dispatcher starts too late to take effect on boot

[Julian Andres Klode]

Reverted the change for now, this needs more work. I guess we should
reject the bionic SRU and figure out what to do.

** Changed in: networkd-dispatcher (Ubuntu Bionic)
       Status: In Progress => Confirmed

** Changed in: networkd-dispatcher (Ubuntu Bionic)
       Status: Confirmed => Triaged

** Changed in: networkd-dispatcher (Ubuntu)
       Status: Fix Released => Triaged

** Changed in: networkd-dispatcher (Ubuntu)
       Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/1772137

Title:
  networkd-dispatcher starts too late to take effect on boot

Status in networkd-dispatcher package in Ubuntu:
  In Progress
Status in networkd-dispatcher source package in Bionic:
  Triaged

Bug description:
  [Impact]
  networkd-dispatcher's systemd unit has default dependencies, which means it starts much, much too late to have any effect for interfaces brought up by networkd at boot (since the events are missed, and not replayed).

  We should instead have systemd unit dependencies like this
  (replicating systemd-networkd's own):

  [Unit]
  Description=Dispatcher daemon for systemd-networkd
  DefaultDependencies=no
  After=systemd-udevd.service network-pre.target systemd-sysusers.service systemd-sysctl.service
  Before=systemd-networkd.service

  In local testing, this DTRT.

  [Test Case]
  Start systemd-networkd / boot system with it, ensure networkd-dispatcher is started before it.

  Run 'journalctl -o short-precise | grep -i ordering'.  There cannot be
  any ordering cycles present.

  [Regression potential]
  Slower boots as systemd-networkd will now only run after networkd-dispatcher.service, and that runs after dbus.service.

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