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Message-ID:	<430C7019.4070307@byu.net>
Date:	Wed, 24 Aug 2005 07:03:21 -0600
From:	Eric Blake <ebb9 AT byu DOT net>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Unable to access forced mounts from /bin/sh
References:	<Pine DOT GSO DOT 4 DOT 61 DOT 0508210147050 DOT 16057 AT slinky DOT cs DOT nyu DOT edu> <4309C081 DOT 9030400 AT byu DOT net>
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According to Eric Blake on 8/22/2005 6:09 AM:
>>>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.

Sure enough, on 'cd -L', bash always checks for the existance of the
entire path, then checks for posixly_correct, then tries chdir(); so bash
succeeds where sh fails when an intermediate path name didn't exist.  A
patch will be provided in bash-3.0-12 whereby if chdir() can succeed even
though intermediate components don't exist, then bash will allow it even
in posix mode.  My understanding of cygwin is that since //, /proc, and
/cygdrive always exist, and /dev has no subdirectories (and in the latest
snapshot, even /dev exists - thanks cgf!), the only time chdir(dir) can
succeed when stat(basename(dir)) fails is with 2-level forced mount points.

- --
Life is short - so eat dessert first!

Eric Blake             ebb9 AT byu DOT net
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