X-Recipient: archive-cygwin AT delorie DOT com X-Spam-Check-By: sourceware.org Date: Tue, 21 Feb 2012 12:45:00 +0100 From: Corinna Vinschen To: cygwin AT cygwin DOT com Subject: Re: sed 4.2.1-1 locks files on windows Message-ID: <20120221114500.GF22597@calimero.vinschen.de> Reply-To: cygwin AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com References: <20120221105805 DOT 256390 AT gmx DOT net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20120221105805.256390@gmx.net> User-Agent: Mutt/1.5.21 (2010-09-15) Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com On Feb 21 11:58, cygwin DOT com AT munub DOT e4ward DOT com wrote: > see here: http://stackoverflow.com/questions/9368783/cygwin-bash-sed-locks-my-files > > When I change files in cygwin bash with the sed command, the file gets locked. > > Reproduce: > > Open cmd and cd to non-user directory (f.e. temp) > echo aaa > test.txt > Open in texteditor, add line, try to save => works > %CYGWIN_HOME%\bin\bash -c "sed -i 's/aaa/bbb/' test.txt > In texteditor, add another line and try to save => "Access denied" I just had a quick look into the aforementioned thread on stackoverflow. The answers are a bit off the track. The problem here is that you mix Windows and Cygwin tools in a directory with weird default permissions which don't translate nicely to POSIX permissions. Here's what happens: - cmd's echo will create the file with default inherited Windows permission bits. These permission bits don't make a lot of sense from a POSIX point of view. That's where the ---------+ permissions come from. That doesn't mean that you have no permissions! Note the + at the end which means, there's an ACL with additional permissions attached to the file. Use getfacl(Cygwin) or cacls(Windows) to print the extra ACEs. - Now you call Cygwin's sed to do in-place editing. The in-place editing works like this: - Create temporary file. - write output to temporary file. - Remove original file. - Move temp file to original file - Restore permissions from original file *in a POSIXy way*. I don't know exactly how sed does that. The problem here are the default permissions on the directory you're calling CMD's echo in the first place. If you don't want to change them, make sure that Cygwin ignores the permissions entirely and only fakes POSIX permissions on that directory. That's what the "noacl" mount option is for: http://cygwin.com/cygwin-ug-net/using.html#mount-table 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