X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Date: Mon, 7 Mar 2011 15:43:49 +0100 From: Corinna Vinschen To: cygwin@cygwin.com Subject: Re: tar --atime-preserve with an empty file triggers a warning Message-ID: <20110307144349.GE18640@calimero.vinschen.de> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <20110307152005.17292u50da242vth@messagerie.si.c-s.fr> <4D74EC98.7090803@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <4D74EC98.7090803@redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: 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 On Mar 7 07:32, Eric Blake wrote: > On 03/07/2011 07:20 AM, EXCOFFIER Denis wrote: > > Hello, > > > > I've the experienced the following (100% reproducible under 1.7.7-1 or > > 1.7.8-1): > > > > % cp /dev/null empty > > Why not the much simpler: > > : > empty > > > % tar cf empty.tar --atime-preserve empty > > /usr/bin/tar: empty: Cannot utime: Invalid argument > > /usr/bin/tar: Exiting with failure status due to previous errors > > % > > > > Of course the empty.tar is created as expected (ie identical as without > > `--atime-preserve). The warning is not produced on Solaris, Darwin or > > Linux, > > therefore i contacted this list. Do you think, with your expertise, that i > > should contact bug-tar also? > > No, this list is correct. utime should not fail on an empty file, so > you've probably exposed a bug in cygwin1.dll. THis looks like a tar bug, per the strace. For some reason, if the file is empty, tar calls futimens on file descriptor 0 (which is connected to /dev/tty1 in my case), while it call futimens on file descriptor 4 (connected to the file empty) if the file empty is... well, not empty. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple