[Bug 19858] New: cygwin tar upset it can't change timestamps; breaks build of cygwin's bash

http://bugs.winehq.org/show_bug.cgi?id=19858

Summary: cygwin tar upset it can't change timestamps; breaks
                    build of cygwin's bash
           Product: Wine
           Version: 1.1.23
          Platform: PC
               URL: http://cygwin.com
        OS/Version: Linux
            Status: NEW
          Keywords: download, source
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

To debug bug 19856, I decided to try to build cygwin's bash
from source so I could see why it refuses to run some commands.
Hilarity ensued.

To repeat:
1) run 
$ winetricks cygwin
and select gcc, automake, patch, and cygport

2) start a cygwin shell
$ cd ~/.wine/drive_c/cygwin
$ wine wineconsole cmd /c cygwin.bat
then use that for all further commands

3) read 'man cygport'

4) download the bash source package from your favorite cygwin mirror, e.g.
$ wget http://cygwin.osuosl.org/release/bash/bash-3.2.49-22-src.tar.bz2

5) unpack the source tarball and use cygport to prepare and build it
$ mkdir temp
$ cd temp
$ tar -xjvf ../bash-3.2.49-22-src.tar.bz2
$ cygport prep bash*cygport

First problem: when cygport prep tries to unpack the inner
tarball, it has a conniption fit because tar can't adjust
the timestamps on its output files.

...
tar: bash-3.2/tests/history.list: Kann utime nicht ausführen: Permission denied
tar: bash-3.2/ABOUT-NLS: Kann utime nicht ausführen: Permission denied
tar: Exiting with failure status due to previous errors
+ warn 'tar zxf bash-3.2.tar.gz failed'

Here's a minimal linux commandline to reproduce:
 gunzip bash-3.2.tar.gz
 wineconsole 'c:\cygwin\bin\tar.exe' -xf bash-3.2.tar
bash-3.2/examples/bashdb/PERMISSION

Looks like tar creates the file, then tries to create it again,
and gets confused?  Maybe cygwin is cleverly trying to use
NtCreateFile somehow to change its timestamp... I'll attach a log.

Workaround: edit cygwin's /bin/cygport and change the two lines
 warn "${unpack_cmd} ${unpack_file_name} failed"
to say
 echo "${unpack_cmd} ${unpack_file_name} failed"

I'll file more bugs for the rest of the process.