Bug#917789: Wrong tarball id (pristine-tar) when import-orig with --components

[Mo Zhou]

On Thu, Jan 03, 2019 at 10:45:12AM +0100, Guido Günther wrote:
> What's your checkout command on the other machine? Did you specify the
> components. Please don't omit the commands you're using for import and
> export

import:

    gbp import-orig --pristine-tar ../opencv_3.4.5+dfsg.orig.tar.xz --component 
contrib

export (where the tarball is imported):

    ~/D/o/opencv ❯❯❯ git st
    HEAD detached at 922bf8f32
    nothing to commit, working tree clean
    ~/D/o/opencv ❯❯❯ pristine-tar checkout opencv_3.4.5+dfsg.orig-contrib.tar.xz
    pristine-tar: successfully generated opencv_3.4.5+dfsg.orig-contrib.tar.xz
    ~/D/o/opencv ❯❯❯ pristine-tar checkout opencv_3.4.5+dfsg.orig.tar.xz
    pristine-tar: successfully generated opencv_3.4.5+dfsg.orig.tar.xz

export (remote):

    It's quite strange that I cannot reproduce this problem anymore
        on the commit in question.

        @Mattia: Are you able to reproduce this problem?

        I can checkout the tarball from both
          git: a0bd84b30b388b9811bc300e9a62801cf89c8966
          git: 922bf8f325761abecfcd8171ab490fba4e821c58
        which yield the same tarball
          c41c9e5892e3d1fa15c0a8016cd5e84c  1.xz
      c41c9e5892e3d1fa15c0a8016cd5e84c  2.xz
    even if they points to different id:
      --- a/opencv_3.4.5+dfsg.orig.tar.xz.id
      +++ b/opencv_3.4.5+dfsg.orig.tar.xz.id
      @@ -1 +1 @@
      -a67d0acc9952eb94c9dc0f50eb1f73777695418e
      +a18a03170473e1773e1f571e561441bc83a3861e