Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Date: Mon, 22 Aug 2005 10:48:02 -0400 (EDT) From: Igor Pechtchanski Reply-To: cygwin@cygwin.com To: Eric Blake cc: cygwin@cygwin.com Subject: Re: Unable to access forced mounts from /bin/sh In-Reply-To: <4309C081.9030400@byu.net> Message-ID: References: <4309C081.9030400@byu.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII On Mon, 22 Aug 2005, Eric Blake wrote: > According to Igor Pechtchanski on 8/20/2005 11:57 PM: > > Here's something weird. I don't know whether this is a problem with the > > latest Cygwin, or bash: > > I don't know if 2-level forced directories would/should ever work. If /a > doesn't exist, then should a forced mount point at /a/b really be > simulating the existance of both a and b? Would /a then be treated as a > read-only file system virtual directory until such time as you actually > 'mkdir /a'? Maybe a better solution is to make 'mount -f' require that > 'dirname path' exist, so that only 'basename path' is forced. Sounds right. , of course... > On the other hand, what if the user does: > $ mkdir /a > $ mount -u -f c: /a/b > $ rmdir /a > > This will take some thought and planning for cygwin1.dll and mount(1) to > get sane behavior in all cases. Maybe the best solution for this case is > to have rmdir(2) to return EBUSY or ENOTEMPTY if the directory being > removed is currently hosting a forced mountpoint. Another problem is that if one has a mount that points to a non-existent directory, rmdir will actually resolve to / (with the obvious disastrous circumstances)... Again, long standing behavior that someone will have to fix... > > Huh? Strace shows that sh fails when trying to stat /a. Does this, > > perhaps, have something to do with bash switching to POSIX mode when > > invoked as "sh"? > > Yes it does. I'll have to look into bash POSIX mode further, and decide > why cd only stat's intermediate paths in POSIX mode, to see if it warrants > a patch to bash. cd will actually stat all partial paths up to the specified one. Your first suggestion (disallow multiple levels of forced mounts) is probably a better solution, anyway. Thanks for looking into this. Igor -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_ pechtcha@cs.nyu.edu ZZZzz /,`.-'`' -. ;-;;,_ igor@watson.ibm.com |,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D. '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! If there's any real truth it's that the entire multidimensional infinity of the Universe is almost certainly being run by a bunch of maniacs. /DA -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/