Using password file for pserver user authentication

[Schlitz]

I am using the $CVSROOT/CVSROOT/passwd file to store login information for
many users who don't have user accounts on the unix server.

Here are some examples:
user1:rFw.zb2Ewn6..:cvsuser
user2:Mb3Czoc1zMBrU:cvsuser
user3:Mb3Czoc1zMBrU:cvsuser

I am using several administrative files (taginfo, commitinfo et. al.) to
kick off scripts to perform various kinds of validation.
In this example, $USER always expands to "cvsuser" in these scripts.  Is
there any way to determine the login name- for example, I want to determine
that the current user is "user1" so that I can differentiate between my
non-system-account cvs users.

Are there any variables set that can provide this information to the admin
files?
Basically, I want to be able to allow users to access the CVS repository
without having to manage unix logons, but still control different levels of
controls/permissions for these users on a module by module basis.

Thanks!
George