[bug-patch] Patch forces group of patched files to users primary group

[Michael Knabe]

Hi,

I'm not sure if this is considered a bug, a feature or a PEBKAC. However when 
you patch a file using 'patch -p0 < foo.diff' patch sets the gid to the users 
primary gid.
This is quite annoying if you patch a file that should be readable by multiple 
users in the same group. E.g. patch is unusable on our webserver, where the 
http daemon has access via group settings. Whenever I patch a file the daemon 
can no longer access it and I need to repair the group setting manually.

Even with the set gid bit set on the directory patch sets the primary group of 
the patching user.

Tested with:
patch 2.5.9 on Debian 5.0.4

Is there any way to tell patch not to change user and group?

Cheers,
Michael Knabe
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