Comment 5 for bug 1425685

Jann, thanks for the comment; I believe the checks aren't strictly necessary; the grep command used to extract one specific variable with the given legal values is the more important part of this patch.

That said, /run/user is a filesystem in its own right, so cross-mount hardlinks aren't possible, and at least on my system, all the directories are mode 700, so hardlinking to another user's file on the filesystem will be difficult.

Have you thought of anything else in the meantime? Thanks