240f2d5b5c
This adds a new concept to homed/pam_systemd/pam_systemd_homed: "areas" are secondary home dirs you can have inside your primary home dir, below an `~/Areas/` hierarchy. You can log into these secondary dirs if you specify "user%area" as user at login time. This is quite useful for maintaining multiple sets of user resources within the same user account with the same access privileges. The intended usecase for me is utimately WSL-like stuff: you start a local unpriv container which gets the host's home dir mounted in and fully accessible, without this also meaning that the user account gets the full set of settings and so on propagated down. Codewise the concept is really simple: whenever an area name like "foobar" is specified we simply change a $HOME of /home/lennart into /home/lennart/Areas/foobar. In a way this PR adds more docs than code for all this. This also makes this feature directly accessible via "run0 -a foobar" (for opening a new session in the 'foobar' area). To be truly fun to use on text (i.e. getty) logins, a util-linux version containing https://github.com/util-linux/util-linux/pull/3354 is best, since otherwise $HOME is updated to /home/lennart/Areas/foobar, but the cwd is still at /home/lennart.
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