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Reply-To: moss AT cs DOT umass DOT edu
Subject: Re: Permissions change concern
References: <5712F224 DOT 7070308 AT cs DOT umass DOT edu> <20160418101803 DOT GM24565 AT calimero DOT vinschen DOT de>
To: cygwin AT cygwin DOT com
From: Eliot Moss <moss AT cs DOT umass DOT edu>
Message-ID: <5714DDA9.3030002@cs.umass.edu>
Date: Mon, 18 Apr 2016 09:14:17 -0400
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On 4/18/2016 6:18 AM, Corinna Vinschen wrote:
> On Apr 16 22:17, Eliot Moss wrote:
>> Dear Corinna (et al.):  I have set up to use a separate group that I call
>> Cygwin for files in my cygwin tree, and in the recent past have been able to
>> apply chown, chgrp, and chmod effectively.  With the latest version, chmod
>> fails to change permissions, though I can change them with setfacl (a pain).
>> [...]
>> The specific behavior I get is that chmod 644 on the file has no
>> effect on the file's permissions - they stay at 774.
>>
>> So, has something in cygwin "broken", or is there some setting I
>> should be doing a different way?
>
> It's broken.  I added a small code snippet in 2.5.0 which was supposed
> to avoid writing a NULL SID ACE in case the POSIX permissions are simple
> enough.  The condition under which to write the NULL SID ACE was...
> uhm... not well thought through.
>
> I applied a fix and I built new developer snapshots available on
> https://cygwin.com/snapshots/.
>
> Please give'em a try.  Since I'm going on vacation end of this week,
> I intend to provide a fixed 2.5.1 ASAP.

Yes, that's better.  I still have two confusions, though:

1) If a directory says:

   default:users::rwx
   default:group::rwx
   default:other:r-x

   and my umask is 022

   when I create a new file by "echo test > foo.bar", foo.bar's
   perms are 644, not the 755 I would expect.

2) If the directory has g+s set (visible from -s- in the flags shown
    by getfacl), the directory's group is Cygwin, and my primary group is moss,
    then the file gets created with group moss, not group Cygwin (which is
    what g+s is supposed to mean, right?)

Thank you for your help!   Eliot Moss

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