From owner-freebsd-hackers Thu Dec 26 15:34:58 1996 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id PAA17264 for hackers-outgoing; Thu, 26 Dec 1996 15:34:58 -0800 (PST) Received: from trapdoor.dstc.edu.au (root@trapdoor.dstc.edu.au [130.102.176.12]) by freefall.freebsd.org (8.8.4/8.8.4) with ESMTP id PAA17249 for ; Thu, 26 Dec 1996 15:34:54 -0800 (PST) Received: from foxtail.dstc.edu.au (foxtail.dstc.edu.au [130.102.176.14]) by trapdoor.dstc.edu.au (8.6.9/8.6.12) with ESMTP id JAA27951; Fri, 27 Dec 1996 09:34:36 +1000 Received: (from leonard@localhost) by foxtail.dstc.edu.au (8.6.10/8.6.10) id JAA07441; Fri, 27 Dec 1996 09:34:35 +1000 From: David Leonard Message-Id: <199612262334.JAA07441@foxtail.dstc.edu.au> Subject: Re: multi-group file access techniques (repost) To: owensc@enc.edu Date: Fri, 27 Dec 1996 09:34:35 +1000 (EST) Cc: hackers@freebsd.org Reply-To: leonard@dstc.edu.au X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk In dstc.mail.freebsd.hackers you write: > .../man_readable_c is a "control directory," a technique that seems [...] > making 'www' the owner of all "choke point" directories: okay, so this technique is emulating ACLs by concatenating the unix permissions on ancestor directories. (correct me if ive got this wrong) > In his article, Doug Morris also speaks of a technique of using hard links > of directories to achieve a similar effect. This technique could be used > in tandem with the above to add more flexibility, but we all know the > GREAT EVIL that hard linked directories are. :-) this could also be done with portalfs or nullfs? hard links can introduce inter-device cycles in the filesystem tree which many program (libraries) rely on the non-existence of. imho introducing ACLs is admitting to complexity :) The really simple solution is having billions of groups and encoding the ACL in them... a perl script should do it :) :) :) -- David Leonard Developer, DSTC The University of Queensland david.leonard@dstc.edu.au http://www.dstc.edu.au/~leonard/ "What is contemplation but laxative for the mind?" - T.A.Casady (?)