[Bug 118180] Re: Pbuilder gives a different md5sum for a source .diff.gz archive in result than the one it started with

[Guillaume Hain]

@Tyler thank you so much!

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https://bugs.launchpad.net/bugs/118180

Title:
  Pbuilder gives a different md5sum for a source .diff.gz archive in
  result than the one it started with

Status in “dpkg” package in Ubuntu:
  Fix Released
Status in “pbuilder” package in Ubuntu:
  Incomplete

Bug description:
  Binary package hint: pbuilder

  To build my Wine packages on different arches, I do the following
  procedure:

  First I modify the source to make sure it works properly.  Then I
  build a source archive using dpkg-buildpackage -S -rfakeroot.  This
  gives me a .dsc file, a .orig.tar.gz file, and a .diff.gz file.

  I then use pbuilder on the i386 computer to build an i386 version of
  the package for upload to my apt repository.  I then upload everything
  in pbuilder's results directory to my APT repository, and add them to
  create an i386 version of the new package.

  Then, I take those .dsc, .orig.tar.gz, and .diff.gz file to an amd64
  computer and tell pbuilder to build the package.  Everything builds as
  normal, however some of the files in the pbuilder result directory
  will have a different md5sum than expected - namely, the .diff.gz
  file.  Since the source archive is the same, there's no reason for
  this file to have changed, unless pbuilder messed with it in some way
  - the most likely thing is decompressing it and then rebuilding it
  with greater compression settings, rather than simply copying the
  .diff.gz file into the result folder.

  This presents a problem, since the resulting .changes file now points
  to what should be the same .diff.gz file as the i386 package, but with
  a different md5sum.  If I upload these files to my apt repository and
  try to tell reprepro to add them, reprepro will throw an error because
  of the conflicting "identical" file with a different md5sum.

  As a workaround, so far I've been manually removing the offending line
  from the second .changes file (and ignoring the new .diff.gz file
  altogether), however a much more elegant solution is to fix pbuilder
  itself.

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