Re: [SAGE] LDAP Migration Question

[Sean Kelly <smkelly@creighton.edu>]

On Fri, Jun 29, 2007 at 11:43:51AM -0500, Chris St. Pierre wrote:
...
> #!/bin/bash
> # invoke as fixerator.sh username new-uid
> # this is untested, and probably won't work, but you get the idea
> old_uid=`getent passwd $1 | awk -F: '{print $3}'
> usermod -u $2 $1
> find / -owner $old_uid | xargs chown $2

This is the approach I'd use as well, however be very careful. Lets say
you've got something like this:

Old UID   New UID
--------- ---------
  1000      2000
  2000      2001

WHen you use the template script above, you could potentially end up with
all files being owned by uid 2001. To be more clear (maybe), be careful you
don't map old to new where the new is equal to other old that havne't yet
been remapped.

If you have a backup of the entire system and you've got a long enough
chunk of downtime, it might be better to make a script that makes a list of
all files with their uid and gid, then make changes based on that stored
list rather than doing another `find` for every iteration. Going further,
it might be best to do it all at once instead of incrementally assuming
you're fairly sure you've got it right and can fairly easily roll back.

-- 
Sean M. Kelly
Unix Systems Architect
Division of Information Technology
Creighton University
(402) 280-2264
AIM: smkellyg5