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From: Matthias Meyer <matthias DOT meyer AT gmx DOT li>
Subject: Re: V1.7 and endless loops triggerd by junction points
Date: Thu, 06 May 2010 19:06:11 +0200
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Corinna Vinschen wrote:

> On May  6 10:41, Corinna Vinschen wrote:
>> On May  5 21:15, Matthias Meyer wrote:
>> > Corinna Vinschen wrote:
>> > > Otherwise, the only difference as far as I can see is the fact that
>> > > the user token attrib inherited from the Cygwin shell has more user
>> > > rights
>> > > enabled.  Namely the backup and restore rights, which allows to
>> > > access
>> > > files and directories which are not available by default.  However,
>> > > this only works in an elevated shell, too.
>> > > 
>> > > However, it's not Cygwin's fault that attrib is not up to speed with
>> > > circular symlinks on an OS which allows them.
>> > > 
>> > It seems to be the backup and restore rights. I can run a cmd as
>> > administrator and attrib don't run into the endless loop.
>> > Also I can run sh from a normal user and attrib will work right.
>> > Only if I run attrib within a process with the backup and restore
>> > rights attrib will run into this endless loop :-(
>> 
>> There's a workaround for you, the cygdrop tool, part of the cygutils
>> package.
>> 
>> Here's an example:
>> 
>>   elevated bash$ cd /cygdrive/c/Users/All\ Users
>> 
>>   elevated bash$ attrib Desktop
>>       HR       C:\ProgramData\Desktop
>> 
>>   elevated bash$ attrib Desktop\\Cygwin.lnk
>>   A            C:\ProgramData\Desktop\Cygwin.lnk
>> 
>>   elevated bash$ cygdrop -p SeBackupPrivilege
>>   /cygdrive/c/Windows/System32/attrib -p Desktop\\Cygwin.lnk File not
>>   found - Desktop\Cygwin.lnk
>> 
>> Unfortunately you have to use the full path to attrib to make it work
>> since cygdrop doesn't perform a path search.
> 
> Sorry about that.  It appears I just stumbled over a Cygwin bug in terms
> of casesensitivity when using the execp family of functions.  Just
> calling `cygdrop -p SeBackupPrivilege attrib' without full path should
> be fine, but it only works on systems which are not configured for
> casesensitivity.  I'll fix that in CVS.
> 
> 
> Corinna
> 
Thank you very much. I will try it after solving my feature number one
(cursor/backspace) ;-)

br
Matthias
-- 
Don't Panic


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