98bac6058c919071ba6b7860b925decacafdc822
Internally, the root cgroup is stored as the empty string in Unit.cgroup_path, and "no cgroup" as NULL. Unfortunately, D-Bus does not know a NULL concept, hence when reporting the cgroup to clients we should turn the root cgroup into "/", and leave the empty string for the "no cgroup" case. This should make sure that "systemctl status -- -.slice" works correctly and shows the entire cgroup tree.
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systemd - System and Service Manager
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