[Bug 795792] New: cerbero backtrace when attempting to package GStreamer master build on ubuntu

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795792

            Bug ID: 795792
           Summary: cerbero backtrace when attempting to package GStreamer
                    master build on ubuntu
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: cerbero
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: matt.thyer at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Cerbero crashes with a Python backtrace when it gets to the packaging stage on
Ubuntu.
Tested on Ubuntu 16.04 LTS and 18.04 LTS native and in docker containers.
This appears to be an issue related to the porting of cerbero from Python 2 to
Python 3 as it does not occur if I checkout version 1.12.4 of cerbero instead
of master.

The two warnings and the backtrace are:

WARNING: No specific packager available for the distro version
ubuntu_18_04_bionic, using generic packager for distro debian
WARNING: No packager defined, using default packager "Default
<default at change.me>"
Traceback (most recent call last):
  File "./cerbero-uninstalled", line 9, in <module>
    main()
  File "./cerbero/main.py", line 130, in main
    Main(sys.argv[1:])
  File "./cerbero/main.py", line 55, in __init__
    self.run_command()
  File "./cerbero/main.py", line 105, in run_command
    res = commands.run(command, self.config, self.args)
  File "./cerbero/commands/__init__.py", line 78, in run
    return _commands[command].run(config, args)
  File "./cerbero/commands/package.py", line 82, in run
    pkg = Packager(config, p, self.store)
  File "./cerbero/packages/packager.py", line 53, in __new__
    return _packagers[d][v](config, package, store)
  File "./cerbero/packages/debian.py", line 448, in __new__
    return DebianPackager(config, package, store)
  File "./cerbero/packages/debian.py", line 187, in __init__
    self.license = f.read()
  File "/usr/lib/python3.6/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 0: ordinal
not in range(128)

Steps to reproduce in a docker container are:

docker run -it ubuntu bash
apt install -y sudo python3 python-dev git intltool
populate your ~/.gitconfig for your identity
mkdir ~/git
cd ~/git
git clone git://anongit.freedesktop.org/gstreamer/cerbero
cd ~/git/cerbero
./cerbero-uninstalled bootstrap
./cerbero-uninstalled package gstreamer-1.0

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