[systemd-bugs] [Bug 85169] New: Add Avoid field to handle sleep modi (hibernate, suspend, hybrid)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85169

            Bug ID: 85169
           Summary: Add Avoid field to handle sleep modi (hibernate,
                    suspend, hybrid)
           Product: systemd
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: high
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: ewl+freedesktop at lavar.de
        QA Contact: systemd-bugs at lists.freedesktop.org

After managing to get my (Debian) system to properly go sleeping using systemd
without the pm framework, I ended with a quite ugly solution where I have a
service that depends on sleep and stops things at start time and (re-)start
them at stop time, so that devices and services that don't like sleep modes are
stopped before and restarted after.
If I didn't miss anything, there isn't such a feature yet, so I would suggest
to add something like a new "Avoid=" field, which would mean for systemd:
- stop the unit before the avoided unit is started
- note down the stopped unit and all stopped dependencies
- once the avoided unit has been stopped, restart all the avoiding units and
what depends on them that was stopped
In this way, a simple "Avoid=sleep.target" added to a service definition would
allow for such units sensible to sleep modes to be stopped and re-started
properly.
A "Avoid=shutdown.target" could similarly be used to have services not starting
automatically to survive a reboot/shutdown cycle if they've been started
manually before.

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