Systemd: Have option to force nspawn into unified cgroup hierarchy mode without checks
UNIFIED_CGROUP_HIERARCHY=1 is documented to force nspawn into unified cgroup hierarchy mode, however it still goes through a code path to check files in an attempt to detect the version of systemd installed (https://github.com/systemd/systemd/blob/master/src/nspawn/nspawn.c#L445) and could error out if the files are not there. We would prefer to skip this check if the environment variable is provided, or make a new option to do so. Can work on patches if this sounds like a reasonable request.
anitazha
All 3 comments
hmm, this actually feels like a bug. If the env var is specified it should take precedence, and the payload shouldn't matter. hence the behaviour you want shouldn't be an option, but the unconditoinal logic...
poettering
on 24 Apr 2019
And yupp, happy to take a patch to fix this, of course!
poettering
on 24 Apr 2019
False alarm here. Environment variable is taking precedence, just had a user error. Sorry!
anitazha
on 26 Apr 2019
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hmm, this actually feels like a bug. If the env var is specified it should take precedence, and the payload shouldn't matter. hence the behaviour you want shouldn't be an option, but the unconditoinal logic...