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Re: pwd output changed with coreutils upgrade from 5.2.1-4 to 5.3.0-2
- From: ericblake at comcast dot net
- To: Lieven Govaerts <lieven dot govaerts at gmail dot com>
- Cc: cygwin at cygwin dot com
- Date: Tue, 22 Feb 2005 23:41:34 +0000
- Subject: Re: pwd output changed with coreutils upgrade from 5.2.1-4 to 5.3.0-2
> Hi all,
> I'm using the pwd.exe command from a standard winXP command prompt
> ( for building Mozilla ).
> However, when I upgrade to coreutils 5.3.0-2 I get this weird result:
> pwd: reading directory `../../../..'
> Even more strange, is that when I execute pwd from the command prompt, I hear
> my floppy disk being accessed.
> Can somebody help me out on this? Is this expected behaviour?
I can reproduce the bug. It is because coreutils switched in 5.3.0 to using opendir("..")/readdir()/closedir() to find the child directory in .. with the same inode as stat("."). However, using the readdir() sequence on "/cygdrive":
a) scans all Windows drives, including floppies (hence the sound of your disk access)
b) tickles a cygwin bug where closedir() incorrectly returns -1 without setting errno (hence the cryptic error message from pwd)
The bug never bit me in testing because I tested from mount points other than /cygdrive.
Also, there is a known bug in coreutils, http://lists.gnu.org/archive/html/bug-coreutils/2005-02/msg00085.html, that pwd(1) is not POSIX compliant because it does not have a -L option that defaults to reading $PWD rather than assuming -P and scanning inodes.
Until such time as a cygwin snapshot fixes closedir() to work correctly (hopefully by cygwin 1.5.13), or such time as I release a coreutils with a compiled in hack to ignore the return of closedir if errno is unchanged, you have two workarounds:
a) rather than using /bin/pwd, use the builtin pwd of /bin/sh or /bin/bash
b) use mount(1) to ensure that your files can be accessed without having to use /cygdrive as their prefix
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