Bug#1058424: pristine-tar gendelta: Make output file reproducible

[Jan-Benedict Glaw]

Package: pristine-tar
Version: 1.50
Severity: wishlist

Running `pristine-tar gendelta` two times on the very same input
tarball generates two different delta files. They contain files in
filesystem order and with "current" timestamps.

  I suggest to use something along this:

       tar     --sort=name                                                      
       \
               --mtime="@${SOURCE_DATE_EPOCH:-$(date +%s)}"                     
       \
               --owner=0                                                        
       \
               --group=0                                                        
       \
               --numeric-owner                                                  
       \
               
--pax-option=exthdr.name=%d/PaxHeaders/%f,delete=atime,delete=ctime     \
               -czf "${artifacts_dir}/${tarball_filename}" "${basename_dir}"


For $SOURCE_DATE_EPOCH, I suggest to use the tarball's mtime.  I'm
unfortunately not a Perl guy, but looking at the sources, it seems
it's just the sub write() in Pristine/Tar/Delta/Tarball.pm that needs
to be extended, and mtime being handed down all the way.

Thanks,
  Jan-Benedict

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