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[Launchpad Bug Tracker <1729754@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package python-wadllib - 1.3.3-1

---------------
python-wadllib (1.3.3-1) unstable; urgency=medium

  * Team upload.

  [ Ondřej Nový ]
  * Fixed VCS URL (https)
  * d/control: Set Vcs-* to salsa.debian.org
  * d/copyright: Use https protocol in Format field
  * d/control: Remove ancient X-Python-Version field
  * d/control: Remove ancient X-Python3-Version field

  [ Piotr Ożarowski ]
  * Add dh-python to Build-Depends

  [ Colin Watson ]
  * New upstream release:
    - Fix MIME encoding of binary parts (LP: #1729754).

 -- Colin Watson <cjwatson@xxxxxxxxxx>  Fri, 20 Jul 2018 14:18:49 +0100

** Changed in: python-wadllib (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1729754

Title:
  Python3 version of launchpadlib doesn't properly upload binary
  attachments to Launchpad

Status in wadllib:
  Fix Released
Status in python-wadllib package in Ubuntu:
  Fix Released
Status in python-wadllib source package in Xenial:
  In Progress
Status in python-wadllib source package in Bionic:
  In Progress

Bug description:
  Tested on 16.04 and 17.10
  python-launchpadlib (1.10.5-1  on 17.10)
  python3-launchpadlib (1.10.5-1 on 17.10)

  While working on porting a utility using launchpadlib from Python2 to
  Python3, I noticed the binary attachments were becoming unreadable.

  I've tried uploading .jpg files, .tgz files, .tar.xz files, they all
  fail to open properly.

  P.S.: When a fix is available, can it be ported to Xenial? We need
  this for our tools running on devices using Xenial.

  [Test Case]
  I wrote a little proof of concept that uploads a given binary attachment to a launchpad issue (see attachment). To use it on staging launchpad:

      APPORT_STAGING=1 ./poc.py <bug_number> </path/to/file.bin>

  When using the exact same script with python2 (basically, replacing
  `python3` with `python` in the shebang line), the binary file is
  properly attached. That's why I think it's a bug with
  python3-launchpadlib.

  [Regression Potential]
  The only sensible way to fix this bug was to rewrite how wadllib does MIME-encoding of its form uploads, so it'll be important to test both text and binary uploads.

  Launchpad only defines a few methods that use multipart/form-data, so
  the regression potential is confined to those: bug.addAttachment,
  distro_arch_series.setChroot, and project_release.add_file.

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