[Bug 844198] /run/user/0 is not available for Kerberos caches

http://bugzilla.suse.com/show_bug.cgi?id=844198 http://bugzilla.suse.com/show_bug.cgi?id=844198#c17 --- Comment #17 from Joschi Brauchle --- Could you comment on how this solution using logind takes care of tasks that simply switch info a users context without the user actually being logged in? AFAICS, this problem is not solved using the logind approach, see description: (In reply to Joschi Brauchle from comment #12)

Please note, that the initial problem of this bug report is caused by an existence problem of the /run/user/<ID> directory, which is only created on login of a specific user. Patching cifs.upcall will only solve the problem for this specific application.

In general, the problem is that the /run/user/$UID directory is only created (by SSSD or PAM) if the user $UID is logged in. But ANY process that uses 'su' to change to user $UID MAY thus fail accessing, as the directory MAY be missing.

See BNC#899118 for example, where a program running as root needs to change userid and acquire KRB kredentials for that userid. The program fails to STORE the acquired kredentials because that userid has never logged into the system before and the /run/user/$UID dir is missing. This is very likely for servers in large environments.

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