Mapping Apache usernames -> subversion usernames

Hi folks,

Is there a way to map apache/kerberos usernames to a set of different
subversion usernames?

For example, I am using apache2 with mod_auth_kerb so usernames show up
as "user@REALM.EXAMPLE.ORG".

This works, but causes a number of problems and general ugliness. For
instance, it makes just about every script that uses the repository have to
jump through hoops, and doesn't match up with the rest of the history from
before when we used htpasswd auth.

Since every user maps to user@example.org, and there only is one realm, I
would like them to show up in subversion simply as "user". It seems like
there has got to be a way[1] to do this easily, either via subversion or
apache.

Any ideas?

For reference, here the relevent apache config:

<Location /svn/XXX>
  DAV svn
  SVNPath /srv/svn/repos/XXX
  SSLRequireSSL
  AuthType Kerberos
  KrbAuthRealms REALM.EXAMPLE.ORG
  AuthName "XXX Subversion Repository"
  AuthzSVNAccessFile /srv/svn/repos/XXX/conf/authz.conf
</Location>

[1] Well, I know one way, which I will do if I have to: hack the source of
either mod_auth_kerb or mod_dav_svn. ;) But that's not the "best" way.

-- 
Wesley J. Landaker <wjl@icecavern.net>
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