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Date:	Thu, 28 Aug 2014 04:34:42 -0600
From:	Eric Blake <eblake AT redhat DOT com>
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Subject:	Re: (call-process ...) hangs in emacs
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On 08/27/2014 09:15 AM, Achim Gratz wrote:
> Ken Brown <kbrown <at> cornell.edu> writes:
>> Achim, could you send me a recipe for reproducing the problem so that I=
=20
>> can test further?  Please be very detailed; I have no experience with AC=
Ls.
>=20
> Let's get one issue out of the way first that may be a Cygwin bug: on Lin=
ux
> a file with all access removed via standard POSIX modes and then access
> granted via ACL would place the mask bits of the ACL (the maximum permiss=
ion
> that can be granted via ACL, usually rwx) into the group portion of the
> POSIX modes (ls --color would even show these in different color if you
> didn't happen to notice the "+").  That doesn't happen on Cygwin and it
> seems that some software optimizes based on that information to not trave=
rse
> the ACL when there's no chance to ever get a permission granted.  This
> behaviour is mandated by POSIX IIUC (and it is what Linux is doing) so
> unless Cygwin explicitly follows a different ACL model, I think that shou=
ld
> be taken care of before diving into this further.

Sadly, POSIX doesn't mandate ACLs (in part because there are so many
differing implementations that it was impossible to standardize a common
ground).  So code using ACLs across multiple platforms has to deal with
quirks, and although gnulib attempts to do so, it may be a shortcoming
in the gnulib wrappers that emacs is using.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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