File create permissions, what am I missing?
mwm-keyword-hackers.e471b2 at mired.org
Sat Aug 13 00:13:33 GMT 2005
In <20050812233728.GA22225 at odin.ac.hmc.edu>, Brooks Davis <brooks at one-eyed-alien.net> typed:
> On Fri, Aug 12, 2005 at 06:34:34PM -0300, João Carlos Mendes Luis wrote:
> > In a directory with -rwxrwxrwx, any user can create files, but who should
> > be the owner/group of this file?
> > Long time ago in Unix history, the owner would be the user who created the
> > file, and the group would be the users's primary group.
> > Later, IIRC, if the directory group was one of the user's secondary groups,
> > the file would also be from this group.
> > A later modification defined that a setgid directory would effect in all
> > files created belonging to the directory's user.
> > Am I correct?
> > But I have already tested 3 system, 2 with 5-stable and 1 with 4-stable, in
> > which the created file inside a -rwxrwxrwx directory is created belonging
> > to the directory's group, WITHOUT the setgid bit. What did I miss?
> On BSD systems, the group of a file is always the group of the directory
> it is in. This differs from SysV UNIX. The resident grey-beard at work
> feels this is a new and annoying behavior. (i.e. it wasn't always this
> way. :)
SysV lets you toggle that behavior on a per-directory basis. Turn the
setgid bit on in the directory, and files created in it will be owned
by the group that owns the directory.
Mike Meyer <mwm at mired.org> http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.
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