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RFE: machinectl to provide starting new session on local machine #825
Something interesting from logs.
Now I'm using kdbus.
Well, there have been long discussions about this, but the problem is that what "su" is supposed to do is very unclear. On one hand it's supposed to open a new session and change a number of execution context parameters (uid, gid, env, ...), and on the other it's supposed to inherit a lot concepts from the originating session (tty, cgroup, audit, ...). Since this is so weakly defined it's a really weird mix&match of old and new paramters. To keep this somewhat managable we decided to only switch the absolute minimum over, and that excludes XDG_RUNTIME_DIR, specifically because XDG_RUNTIME_DIR is actually bound to the session/audit runtime and those we do not transition. Instead we simply unset it.
Long story short: "su" is really a broken concept. It will given you kind of a shell, and it's fine to use it for that, but it's not a full login, and shouldn't be mistaken for one.
THis has come up many times, but nothing really changed, hence closing this now. I understand this is confusing and unexpected, but well, that's UNIX...
Well, you can use su and sudo as before, but don#t expect that it will work in full, because it never did.
I am not aware of a commonly used tool besides ssh that would give you a completely fresh login locally without inheriting anything. I figure "machinectl login" could be updated to do that though...