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https://bugzilla.redhat.com/show_bug.cgi?id=598299
--- Comment #8 from Lennart Poettering lpoetter@redhat.com 2010-06-02 15:07:40 EDT --- git master now mounts a tmpfs to /cgroup. That means that the /cgroup/systemd dir can be dynamically created at runtime by systemd. However, the /cgroup dir must exist on boot, since / tends to be ro during early boot. That means something or somebody must create /cgroup on package installation. I'd probably just do an mkdir in %post, if that's acceptable.