Add support for services with a delegate cgroup subhierarchy in checkservices + ignore services in machine.slice by default

[Antiz96]

This commit adds support for services with a delegate cgroup subhierarchy and introduces the -m/-M option to include or not services in machine.slice (default is no).

Parts of the patch are taken from #61 (comment) & #61 (comment)

Fixes #61

[lahwaacz]

Hmm, after this change checkservices tells me that some systemd-nspawn@... services would be restarted which might not be a good thing (it would restart the whole container with potentially many services). We might ignore all units in the machine.slice, similar to user.slice, or at least make it configurable.

[Antiz96]

Hmm, after this change checkservices tells me that some systemd-nspawn@... services would be restarted which might not be a good thing (it would restart the whole container with potentially many services). We might ignore all units in the machine.slice, similar to user.slice, or at least make it configurable.

Sounds reasonable, I'll work on that in a few.

[Antiz96]

@lahwaacz I added the -m|-M option to ignore/include services in machine.slice (ignored by default), similar to how it is done with the -u|-U option for the user.slice.

[lahwaacz]

LGTM, thanks for looking into this! 🎉

[injiniero]

Thank you for adding the -m/-M support, but you forgot to add the Mm options to getops

while getopts 'AahFfLlPpRrSsUuMmZzi:' opt; do

[Antiz96]

Thank you for adding the -m/-M support, but you forgot to add the Mm options to getops

while getopts 'AahFfLlPpRrSsUuMmZzi:' opt; do

Oops, indeed. Sorry about that, fixing it right now!

[Antiz96]

@injiniero Fixed in #81, thanks for the heads up!

[Antiz96]

I probably won't cut a new release just for that though, I'll patch the archlinux-contrib package in [extra] directly instead.

EDIT: Done