02-15-2008
There is no setting for the file's protection masks or the directory's protection mask that will do what you want.
All I can think of:
Write a simple daemon with root priv, that periocially updates file ownership of files in your directory - that do not belong to the owner of the directory.
BUT. This scheme is fraught with problems. Suppose one user has umask=077.
The user opens and writes the file. Closes file. daemon comes along and changes ownership. Now what happens? The original user can't do much with the file.
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LEARN ABOUT DEBIAN
lfc-chgrp
LFC-CHGRP(1) LFC User Commands LFC-CHGRP(1)
NAME
lfc-chgrp - change group ownership of a LFC directory/file in the name server
SYNOPSIS
lfc-chgrp [-h] [-R] group path...
DESCRIPTION
lfc-chgrp sets the group ownership of a LFC directory/file in the name server to the value of group.
To change the group ID, the effective user ID of the process must match the owner ID of the file and the new group must be in the list of
groups the caller belong to or the caller must have ADMIN privilege in the Cupv database.
group is either a valid group name or a valid numeric ID.
path specifies the LFC pathname. If path does not start with /, it is prefixed by the content of the LFC_HOME environment variable.
OPTIONS
The following options are supported:
-h If path is a symbolic link, changes the ownership of the link itself.
-R Recursive mode.
EXIT STATUS
This program returns 0 if the operation was successful or >0 if the operation failed.
SEE ALSO
Castor_limits(4), lfc_chown(3), Cupvlist(1)
AUTHOR
LCG Grid Deployment Team
LFC
$Date: 2007/01/13 10:35:39 $ LFC-CHGRP(1)