tl;dr: I just changed a bunch of users from primary gid 550 to primary
gid 500, and then added them as members to group 550. This should be
unnoticeable to those of you who were already happy, and should fix a
few odd file-permission issues that some of you were seeing. If, on the
contrary, anyone sees /new/ problems with file permissions, please
respond to this email.
For reference: https://bugzilla.wikimedia.org/show_bug.cgi?id=63028
Full (still not all that long) explanation:
Back in the early days of labs, a bunch of user accounts were migrated
from svn using scripts that differed from the current web-based system.
For reasons unclear to me, the modern account creation tools add users
to the 'wikidev' group, number 500, but the old, migrated users landed
in the 'svn' group, 550. For the most part this didn't matter, but
lately we've been running into a few cases (mostly involving betalabs)
where that diversity of group id causes weird issues with file sharing
and permissions.
Since wikidev users outnumber svn users by 5:1, I've just moved everyone
into wikidev. There remains a vestigial 'svn' group, and all of the old
svn users are now honorary members of that group. This will permit
everyone to continue reading and writing to their old files -- the
change is that /new/ files will generally belong to wikidev. (That last
sentence is subject to multiple disclaimers having to do with parent
directory, default bitmask, etc, but it's a good starting point.)
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