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Subject: Re: cygwin potentially corrupting permissions?
To: cygwin AT cygwin DOT com
References: <CAGpXXZKUQtAbrQ80VDHZhy0aZtzG+5fDB7bcYz-kwQ3Kgx6ueQ AT mail DOT gmail DOT com> <560366EE DOT 5020207 AT tlinx DOT org> <CAGpXXZJeWs33BJi7qROduZEhTx1pXXXseTbfXu+QP8+cf_r5hQ AT mail DOT gmail DOT com> <56043BA4 DOT 7040405 AT tlinx DOT org> <CAGpXXZLrourgJ39=n4M8kEKeF7tT3fCTafvLaSfZuHh62ffmUA AT mail DOT gmail DOT com>
From: Ken Brown <kbrown AT cornell DOT edu>
Message-ID: <56044D87.1070409@cornell.edu>
Date: Thu, 24 Sep 2015 15:22:47 -0400
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On 9/24/2015 2:52 PM, Greg Freemyer wrote:
> On Thu, Sep 24, 2015 at 2:06 PM, Linda Walsh <cygwin AT tlinx DOT org> wrote:
>> Greg Freemyer wrote:
>>>
>>> Linda,
>>
>>
>>> I saved your script as "lsacl.txt".  Then I used "cp lsacl.txt it" to
>>> make a copy.
>>>
>>> The copy is permission denied for reading.  Basic ls -l shows no
>>> difference (as expected)
>>>
>>> $ ls -l lsacl.sh it
>>> ----rwx---+ 1 gaf None 1630 Sep 24 12:05 it
>>> ----rwx---+ 1 gaf None 1630 Sep 24 12:00 lsacl.sh
>>>
>>> But your script does show a difference:
>>>
>>> $ ./lsacl.sh lsacl.sh it
>>> [u::---,g::---,g:root:rwx,g:Authenticated
>>> Users:rwx,g:SYSTEM:rwx,g:Users:r-x,m:rwx,o:---/] lsacl.sh
>>> [u::---,g::r-x,g:root:rwx,g:Authenticated
>>> Users:rwx,g:SYSTEM:rwx,g:Users:r-x,m:rwx,o:---/] it
>>
>> ---
>>          Well user 'gaf' (that's you, from the file perms has no access).
>>
>>          So up front, you are denied before anything happens.
>
> Totally logical, but not accurate. )
>
> I am the owner of both "it" and "lsacl.sh."
>
> For both the user permissions are "---"  (why I don't know.  I created
> lsacl.sh by a simple drag and drop out of firefox.)
>
> I can cat out "lsacl.sh", but not "it".
>
> I know "chmod +rw it" gives me access to the file.  The problem is
> Windows is creating files with permissions like lsacl.sh routinely on
> my system.
>
> Then when I do anything to them in cygwin, the permissions are
> modified to block my access.
>
> I first noticed this because I was exporting CSV files from excel,
> then editing them with vi from cygwin.
>
> On the first edit, all was good.  After that, I no longer had
> permission to access the file.
>
> So, either:
>
> - Windows 7 (on 2 different machines) has started using default
> permissions that are bad on their face
>
> - cygwin is not properly maintaining the permissions when it manipulates a file
>
> Either way, I would really like a solution that doesn't involve a
> manual chmod for every file I create via the normal Windows interface
> and which I want to work with it in cygwin.

The problem could be caused by the default ACL on whatever directory 
you're working in.  You might consider running 'setfacl -b' and/or 
'setfacl -k' on that directory.  (Run 'setfacl --help' for more 
information.)

Ken


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