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Date:	Thu, 21 Jul 2011 17:11:04 -0400
From:	"Larry Hall (Cygwin)" <reply-to-list-only-lh AT cygwin DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: [ -w filename ] returns true when permissions are -r--r--r--
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On 7/21/2011 3:01 PM, Corinna Vinschen wrote:
> On Jul 21 14:51, Larry Hall (Cygwin) wrote:
>> On 7/21/2011 9:31 AM, Corinna Vinschen wrote:
>>> On Jul 21 07:43, Nellis, Kenneth wrote:
>>>>> From: Eric Blake
>>>>> On 07/20/2011 12:05 PM, Reid Thompson wrote:
>>>>>> Is this broken?  Or a known windows/cygwin discrepancy?  Or am I
>>>>> missing
>>>>>> something with my posix/windows file permissions settings
>>>>>
>>>>> If you are running as an administrator, that might explain it.  Admins
>>>>> can alter any file regardless of permissions, in which case [ -w is
>>>>> telling you the truth that under your current uid, you can indeed write
>>>>> to the file.
>>>>>
>>>>> This is a feature of access(file,W_OK), and not a bug.
>>>>
>>>> FWIW, I'm not running as administrator and I'm running 1.7.9, and I'm
>>>> seeing the same thing:
>>>>
>>>> $ touch afile
>>>> $ chmod 444 afile
>>>> $ ls -l
>>>> total 0
>>>> -r--r--r-- 1 knellis knellis 0 Jul 21 08:36 afile
>>>> $ [ -w afile ]&&   echo writable || echo not writable
>>>> writable
>>>> $ echo abc>>   afile
>>>> $ cat afile
>>>> abc
>>>> $ ls -l
>>>> total 1
>>>> -r--r--r-- 1 knellis knellis 4 Jul 21 08:37 afile
>>>> $
>>>
>>> What system?  XP, Vista?  7?
>>> What's the output of `id'?
>>
>> Or even<http://cygwin.com/snapshots/>. ;-)
>
> In this case I don't think so.  I can't reproduce this with 1.7.9
> either, unless the SE_BACKUP_NAME privilege is in the user token and
> can be enabled by Cygwin.  This is usually only the case if the user
> is member of the Administrators group and the shell is not running
> with a restricted token (UAC).

Yikes!  I didn't even notice that I pasted the wrong link.  I meant
<http://cygwin.com/problems.html>.  Sorry for the noise. :-(

-- 
Larry

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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