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30f8f51eab
Shared pid namespace means `runc kill` (or `runc delete -f`) have to kill all container processes, not just init. To do so, it needs a cgroup to read the PIDs from. If there is no cgroup, processes will be leaked, and so such configuration is bad and should not be allowed. To keep backward compatibility, though, let's merely warn about this for now. Alas, the only way to know if cgroup access is available is by returning an error from Manager.Apply. Amend fs cgroup managers to do so (systemd doesn't need it, since v1 can't work with rootless, and cgroup v2 does not have a special rootless case). Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>