systemd: don't suggest restarting units with RefuseManualStart=true

[flokli]

Today, home-manager suggested me to restart gpg-agent.service, which has RefuseManualStart set to true.

Trying to issue the suggested command complained:

Failed to restart gpg-agent.service: Operation refused, unit gpg-agent.service may be requested by dependency only (it is configured to refuse manual start/stop).
See user logs and 'systemctl --user status gpg-agent.service' for details.

The suggestion script should simply exclude services that can't be restarted manually.

[rycee]

Thanks for reporting! I think this should be fixed in master now.

Note, we'll never be very intelligent about the suggested commands here. In this case I think we can do something reasonably but in general I think it'll have to wait until we can use the NixOS machinery, which is much smarter.

[flokli]

Sure, but this small idea just came into my mind. Thanks for the fix :-)