Detecting the init system in use

[Martin Pitt]

Robie Basak [2017-12-13 17:57 +0000]:
> 1) Fix systemd on Trusty so that testing for /run/systemd/system works
> again. This will probably need to remove /run/systemd/system correctly
> on postinst as part of the fix. This will unbreak MAAS and snapd working
> together.

It may work  to adjust the upstart job that starts the deputy init systemd to
create its own mount namespace, do a shared bind-mount of the host's
/run/systemd/ its own namespace, and then do a private tmpfs mount on
/run/systemd/system/ . Then only pid 1 itself should see /run/systemd/system/.
This of course might break systemd-y things that try to read this, but usually
there's not much in this dir anyway.

I haven't tried this, just as a thought for experimentation.

Pitti
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