[Bug 1729754] Re: Python3 version of launchpadlib doesn't properly upload binary attachments to Launchpad

[Colin Watson]

** Also affects: python-wadllib (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: wadllib
       Status: In Progress => Fix Committed

** Also affects: python-wadllib (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: python-wadllib (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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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 Committed
Status in python-wadllib package in Ubuntu:
  New
Status in python-wadllib source package in Xenial:
  New
Status in python-wadllib source package in Bionic:
  New

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 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.

  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.

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