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Re: [ -w filename ] returns true when permissions are -r--r--r--


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

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