Bug#806885: systemd: Unable to disable mount of /run/user/$something

[Joerg Jaspert]

Package: systemd
Version: 215-17+deb8u2
Severity: normal

Dear Maintainer,

(thats mostly a bug/feature for upstream, please forward to wherever needed,
thanks).

It seems that the mounting of /run/user/$something as tmpfs can not be
disabled. Would be nice if it has an option for this.

Background / Use case: We have a login server here, the only way to
reach our internal machines.  This is pretty restricted, down to the
inability of any new mount while the system is running. Yet, logind
does try to mount the /run/user/$id on every users login (well, inital
session creation), which gets denied.

As the directory gets created before the mount (and thankfully chmod
700 too), there is no trouble - it is there for whatever wants to use
it (nothing, really), but every mount try spits out an error.

An option to turn off this behaviour would be nice.


I tried setting RuntimeDirectorySize to 0, hoping that this may be
seen as "mount of size 0 isnt useful, not doing it". Well, no, it
still tries to mount it. If I allow mounts so i can test things, the
mount doesn't appear, as a tmpfs of size 0 doesn't work out inside the
tmpfs driver.  But the mount call is still issued. As such, in the
restricted system, it spits out an error.

Not using logind would be a possibility, but it does other nice things
(killing user processes on logout, removing IPC, ...), so we would
like to keep it.

-- 
bye Joerg