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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: C:\devel\lgo\mozilla>pwd 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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