f9c91932b4
This adds support for the new XDG_STATE_HOME env var that was added to the xdg basedir spec. Previously, because the basedir spec didn't know the concept we'd alias the backing dir for StateDirectory= to the one for ConfigurationDirectory= when runnin in --user mode. With this change we'll make separate. This brings us various benefits, such as proper "systemctl clean" support, where we can clear service state separately from service configuration, now in user mode too. This does not come without complications: retaining compatibility with older setups is difficult, because we cannot possibly identitfy which files in existing populated config dirs are actually "state" and which one are true" configuration. Hence let's deal with this pragmatically: if we detect that a service that has both dirs configured only has the configuration dir existing, then symlink the state dir to the configuration dir to retain compatibility. This is not great, but it's the only somewhat reasonable way out I can see. Fixes: #25739
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