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Date: Thu, 6 May 2010 11:57:11 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: V1.7 and endless loops triggerd by junction points
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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

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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