Lennart Poettering
78f93209fc
Otherwise we might conflict with the "no-processes-in-inner-cgroup" rule of cgroupsv2. Consider nspawn starting up and initializing its cgroup hierarchy with "supervisor/" and "payload/" as subcgroup, with itself moved into the former and the payload into the latter. Now, if an ExecStartPre= is run right after it cannot be placed in the main cgroup, because that is now in inner cgroup with populated children. Hence, let's run these helpers in another sub-cgroup .control/ below it. This is somewhat ugly since it weakens the clear separation of ownership, but given that this is an explicit contract, and double opt-in should be acceptable. Fixes: #10482
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