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Re: Supporting arbitrary file attributes
From: |
Paul Eggert |
Subject: |
Re: Supporting arbitrary file attributes |
Date: |
Sat, 30 Mar 2002 22:08:44 -0800 (PST) |
> From: Mike Gerdts <address@hidden>
> Date: 30 Mar 2002 23:32:59 -0500
>
> A common problem with each vendor's version of tar is that it is unable
> to support things like ACL's, extended attributes, etc. effectively.
> Furthermore, if one vendor comes up with a solution for the problem and
> an analagous structure exists on another vendor's platform, there is no
> guarantee that the information can be transported via a tar, cpio, or
> any other known cross-platform utility.
Some of these problems have been fixed in POSIX 1003.1-2001. Have
you taken a look at its specification of tar and pax format?
You can read the POSIX 1003.1-2001 spec online at:
http://www.UNIX-systems.org/version3/online.html
Registration is required, the terms are here:
http://www.opengroup.org/onlinepubs/terms.htm
Look at the 'pax' command for a description of the new standard
formats, in particular the pax Interchange Format.
> A slightly more complicated example would be to store Solaris Access
> Control Lists (ACLs).
There's no standard for ACLs, unfortunately. Have you looked at how
Solaris 9 etc. do these things? No sense reinventing the wheel.
> Tar implementations that are aware of this extensible header format that
> do not support a particulare extensible feature should emit a warning
> when the attributes cannot be assigned to the file.
The pax Interchange Format addresses this issue to some extent.
> Am I describing a free utility that already exists?
Not as far as I know. Nobody has had the time to work on this stuff yet.
- Supporting arbitrary file attributes, Mike Gerdts, 2002/03/30
- Re: Supporting arbitrary file attributes,
Paul Eggert <=
- Re: Supporting arbitrary file attributes, Joerg Schilling, 2002/03/31
- Re: Supporting arbitrary file attributes, Joerg Schilling, 2002/03/31
- Re: Supporting arbitrary file attributes, Joerg Schilling, 2002/03/31
- Re: Supporting arbitrary file attributes, Joerg Schilling, 2002/03/31
- Re: Supporting arbitrary file attributes, Joerg Schilling, 2002/03/31