- From: Slein, Judith A <JSlein@crt.xerox.com>
- Date: Wed, 8 Sep 1999 11:46:48 -0400
- To: "'jamsden@us.ibm.com'" <jamsden@us.ibm.com>, w3c-dist-auth@w3.org
As I noted in the message that started this thread, our proposal contradicts what RFC 2518 says about preserving locks on a MOVE. We would like to see the WebDAV spec changed when it goes to draft status to say that locks are *not* lost on a MOVE. Judith A. Slein XR&T/Xerox Architecture Center jslein@crt.xerox.com 8*222-5169 > -----Original Message----- > From: jamsden@us.ibm.com [mailto:jamsden@us.ibm.com] > Sent: Wednesday, September 08, 1999 11:12 AM > To: w3c-dist-auth@w3.org > Subject: RE: Bindings, Locks, and MOVE > > > > > The WebDAV spec says that locks are lost on MOVE. So if the > source resource is > locked, then the MOVE request must include the lock token, > and the lock must be > owned by the requesting principal. Otherwise the delete > portion of the move will > fail. Since MOVE is a best effort method, the copy to the > destination will work, > even if the source can't be deleted. As is the case with > COPY, the lock on the > destination resource is determined by its new parent > collection, not by any lock > state it may have had. This could be taken to mean that the > new resource is not > the same resource moved to a new location, but a different resource. > > > > > > "Slein, Judith A" <JSlein@crt.xerox.com> on 09/08/99 09:34:03 AM > > To: "'Yaron Goland (Exchange)'" <yarong@Exchange.Microsoft.com>, > w3c-dist-auth@w3.org > cc: > > Subject: RE: Bindings, Locks, and MOVE > > > > > The intention is that if a resource is copied or moved into a > tree that is > locked, the lock on the tree remains in force. > > We didn't discuss the case where you are doing a MOVE, and > the resource > being moved is locked, and it is being moved into a collection that is > locked. The lock on the collection will certainly stay in > force, but we > need to decide whether the lock on the resource being MOVEd > will be lost or > whether the MOVE will fail. I guess my own opinion is that > the MOVE should > fail, since that maintains a consistent position that the > state of a MOVEd > resource should be unaffected by the move; if its lock state > would have to > be changed, the move should fail. > > Judith A. Slein > XR&T/Xerox Architecture Center > jslein@crt.xerox.com > 8*222-5169 > > > > -----Original Message----- > > From: Yaron Goland (Exchange) [mailto:yarong@Exchange.Microsoft.com] > > Sent: Tuesday, September 07, 1999 8:49 PM > > To: 'Slein, Judith A'; 'Greg Stein'; w3c-dist-auth@w3.org > > Subject: RE: Bindings, Locks, and MOVE > > > > > > Phew!!! I couldn't believe what I was reading regarding write > > locks. What > > use is a write lock that only sometimes is a write lock? > > Yikes. I'm glad > > that is dead. > > > > However there is still a point in the original post that > > concerns me. Let's > > see if I understand the proposal: > > > > When copying a resource into a tree that is currently locked > > then the lock > > on that tree is lost? > > > > Is that the proposal for how to handle locks at the > > destination of a copied > > resource? That is my reading of the paragraph Judy provided. > > > > Yaron > > > > > -----Original Message----- > > > From: Slein, Judith A [mailto:JSlein@crt.xerox.com] > > > Sent: Tue, September 07, 1999 7:19 AM > > > To: 'Greg Stein'; w3c-dist-auth@w3.org > > > Subject: RE: Bindings, Locks, and MOVE > > > > > > > > > Thanks for bringing the discussion back to earth. > > > > > > I agree with you that the compromise of saying that servers > > > SHOULD protect > > > the path of the Request-URI used in locking a resource is a > > > poor one. It > > > doesn't respond to the issue that was raised, and it > > > needlessly muddies the > > > waters for clients, which now don't know whether the path > > > will be protected > > > or not. > > > > > > I like your suggestion that we keep the MUST language, but > > > state that it > > > applies only to write locks. > > > > > > --Judy > > > > > > > > > > -----Original Message----- > > > > From: Greg Stein [mailto:gstein@lyra.org] > > > > Sent: Friday, September 03, 1999 3:24 AM > > > > To: w3c-dist-auth@w3.org > > > > Subject: Re: Bindings, Locks, and MOVE > > > > > > > > > > > > This whole thread (post-Judy's message) seems to be picking > > > out a very > > > > minor detail of her post. Personally, I find this nit-picking > > > > of detail > > > > counter to the goal of her original post: "test its > > > > conclusions with the > > > > mailing list members." > > > > > > > > For myself (and mod_dav), the first "AGREED" portion > > makes complete > > > > sense, and I do agree with it. > > > > [btw, is *anybody* going to be implementing cross-server > > > MOVE/COPY? is > > > > it necessary to have that feature in the spec at all? of the > > > > umpteen DAV > > > > servers out there now, I don't know any that do this or plan > > > > to do this. > > > > It would be nice to cut the thing and not worry about it.] > > > > > > > > The second "AGREED" portion does not make a whole lot of > > sense. The > > > > commentary states that the position is too strong [because it > > > > might not > > > > make sense with other types of locks]. Are there other locks > > > > out there? > > > > Do people have concrete, useful examples? I haven't heard > > > of anything > > > > besides a write-lock yet. Regardless, I think it should be > > > enforced in > > > > the spec that a write-lock MUST have guaranteed > protection of the > > > > Request-URI. Put in some language that says other locks can > > > define the > > > > MUST/SHOULD nature of protection. Otherwise, leave it in > > > the intuitive > > > > state: a write lock says that others cannot monkey with > your URI. > > > > > > > > Cheers, > > > > -g > > > > > > > > Edgar Schwarz wrote: > > > > > > > > > > On Thu, 2 Sep 1999, Geoffrey M. Clemm wrote: > > > > > > > > > > > From: ccjason@us.ibm.com > > > > > > > > > > > > <JS> > > > > > > This discussion began with Yaron's comment that saying > > > > that "it MUST NOT be > > > > > > possible for a principal other than the lock owner to > > > > make a locked resource > > > > > > inaccessible via the URI mapping used to lock the > > > > resource" is too strong. > > > > > > It may make sense for write locks as defined in RFC > > > > 2518, but may not make > > > > > > sense for other sorts of locks that don't restrict > > > > MOVE and DELETE. > > > > > > </JS> > > > > > > > > > > > > I believe that this is not specific to any particular > > > > type of locks. All > > > > > > clients need to insure that they have at the very > > > > least a way to unlock > > > > > > the the locks they have created. I assume that to > > > > unlock (a resource), we > > > > > > have to provide a URI of a (the?) resource locked by > > > > that lock... so if > > > > > > someone else changes the URI, it's > > > > > > very likely that we're not going to be able to figure > > > > out what the new > > > > > > URI is... and will have to leave the lock around until > > > > it times out. > > > > > > > > > > > > <gmc> Since the server needs to deal with this in case > > > > the client just > > > > > > neglects to remove the lock, and if having another client > > > > MOVE your > > > > > > locked resource is a rare occurrence (which I believe > > > it is), then > > > > > > this does not seem to be especially problematical. > > > > > Would it be possible to say: > > > > > If a locked resource is moved the server SHOULD create > > > a indirect > > > > > reference resource which should exist for some > sensible time. > > > > > > > > > > Yes I know, it's complicating the server :-) > > > > > I imagine the above happening perhaps when somebody is > > > reorganizing > > > > > a directory structure and deep in the collections > there are some > > > > > locked resources. > > > > > So the lock owner at least has a decent chance to find > > > out where his > > > > > resource has gone to. > > > > > > > > > > Regards, Edgar > > > > > > > > > > -- > > > > > Edgar.Schwarz@de.bosch.com ON/EMS1, 07191/13-3382 > > > > Niklaus Wirth: > > > > > Privat kann jeder soviel C programmieren oder Videos > > > > ansehen wie er mag. > > > > > Albert Einstein: Mach es so einfach wie moeglich, aber > > > > nicht einfacher. > > > > > > > > -- > > > > Greg Stein, http://www.lyra.org/ > > > > > > > > > > > > > >
Received on Wednesday, 8 September 1999 11:47:01 UTC