Re: File create permissions, what am I missing?

From: Brooks Davis (brooks_at_one-eyed-alien.net)
Date: 08/13/05

  • Next message: Luigi Rizzo: "Re: 5.4 -- bridging, ipfw, dot1q" 
    Date: Fri, 12 Aug 2005 16:37:28 -0700
To: Joćo Carlos Mendes Luis <jonny@jonny.eng.br>

    On Fri, Aug 12, 2005 at 06:34:34PM -0300, Joćo 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. :)

    -- Brooks 

    -- 
Any statement of the form "X is the one, true Y" is FALSE.
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