cd58b5a135
This commit adds two settings private and strict to the ProtectControlGroups= property. Private will unshare the cgroup namespace and mount a read-write private cgroup2 filesystem at /sys/fs/cgroup. Strict does the same except the mount is read-only. Since the unit is running in a cgroup namespace, the new root of /sys/fs/cgroup is the unit's own cgroup. We also add a new dbus property ProtectControlGroupsEx which accepts strings instead of boolean. This will allow users to use private/strict via dbus and systemd-run in addition to service files. Note private and strict fall back to no and yes respectively if the kernel doesn't support cgroup2 or system is not using unified hierarchy. Fixes: #34634
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