Re: Postinstall for mintty fails when installing "just for me"

[Corinna Vinschen <corinna-cygwin at cygwin dot com>]

On Aug 17 15:12, Buchbinder, Barry (NIH/NIAID) [E] wrote:
> Corinna Vinschen sent the following at Tuesday, August 17, 2010 4:49 AM
> >> On 17 August 2010 02:26, Buchbinder, Barry wrote:
> >> > $ bash --norc --noprofile /etc/postinstall/mintty.sh
> >> > /bin/mkdir: cannot create directory `/c/Documents and Settings/All
> >> > Users/Start Menu/Programs/Cygwin': Permission denied
> >> > mkshortcut: Saving "C:\Documents and Settings\All Users\Start Menu\Programs\Cygwin\mintty.lnk" failed; does the target directory exist?
> >> > /bin/chmod: cannot access `/c/Documents and Settings/All Users/Start
> >> > Menu/Programs/Cygwin/mintty.lnk': No such file or directory echo $?
> >> > 1
> >[...]
> >The problem is, we don't know anything about your environment, Barry.
> >cygcheck output as requested by http://cygwin.com/problems.html would be
> >helpful, perhaps.
> 
> Attached.
> 
> Please note:
> 
> $ cygcheck -s -v -r > cygcheck.out
> /usr/bin/cygrunsrv: warning: OpenService failed for 'TapiSrv': Win32 error 5
> Access is denied.

That usually just means you don't have admin privs.

> 
> >As is getfacl/cacls output for the "/c/Documents and
> >Settings/All Users/Start Menu/Programs" directory.
> 
> $ getfacl '/c/Documents and Settings/All Users/Start Menu/Programs'
> # file: /c/Documents and Settings/All Users/Start Menu/Programs
> # owner: BBuchbinder
> # group: Domain Users
> user::rwx
> group::r-x
> other:r-x
> mask:rwx
> 
> $ cacls 'C:\Documents and Settings\All Users\Start Menu\Programs'
> C:\Documents and Settings\All Users\Start Menu\Programs BUILTIN\Administrators:(OI)(CI)F
>                                                         CREATOR OWNER:(OI)(CI)(IO)F
>                                                         NT AUTHORITY\SYSTEM:(OI)(CI)F
>                                                         BUILTIN\Users:(OI)(CI)R
>[...]

Here's the actual problem:

  cygdrive prefix     /         system  binary,noacl,posix=0,auto

The cygdrive prefix is set to the mount option "noacl".  So the output
from getfacl or ls or stat for this directory shows just fake
permissions based on the DOS R/O flag.

You're not an admin, so you're not allowed to write to this directory,
see the cacls output.  However, since the cygdrive prefix is mounted
with "noacl", Cygwin tools just don't know it.

Andy, to workaround this, you *could* create a user mount first which
has no "noacl", then use the user mount to check permissions, and
eventually umount again.  Like this:

  PROGS=/tmp/.mintty-postinstall-$$
  mount -f "`cygpath -APm`" $PROGS
  if [ -w "$PROGS" ]; then
    [...]
  else
    [...]
  fi
  umount $PROGS


Corinna

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

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