[Bug 790123] New: Importing Gst from gi.repository fails with gst_uninstalled setup

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790123

            Bug ID: 790123
           Summary: Importing Gst from gi.repository fails with
                    gst_uninstalled setup
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-python
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I just setup a new gst-uninstalled environment using:

curl
https://cgit.freedesktop.org/gstreamer/gstreamer/plain/scripts/create-uninstalled-setup.sh
| sh
ln -sf ~/gst/master/gstreamer/scripts/gst-uninstalled ~/gst-master
echo "Run: ./gstreamer/scripts/git-update.sh"
~/gst-master

I run git-update, and after building i check that it works with gst-inspect
etc.
$ gst-launch-1.0 --version
gst-launch-1.0 version 1.13.0
GStreamer 1.13.0 (GIT)

Then, from within gst-master, running the following fails:

$ cat test.py 
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from gi.repository import Gst

$ python test.py 
Traceback (most recent call last):
  File "test.py", line 3, in <module>
    from gi.repository import Gst
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load
  File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 646, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 616, in _load_backward_compatible
  File "/usr/lib/python3.6/site-packages/gi/importer.py", line 146, in
load_module
    dynamic_module = load_overrides(introspection_module)
  File "/usr/lib/python3.6/site-packages/gi/overrides/__init__.py", line 125,
in load_overrides
    override_mod = importlib.import_module(override_package_name)
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/usr/lib/python3.6/site-packages/gi/overrides/Gst.py", line 581, in
<module>
    real_functions = [o for o in inspect.getmembers(Gst) if isinstance(o[1],
type(Gst.init))]
  File "/usr/lib/python3.6/inspect.py", line 342, in getmembers
    value = getattr(object, key)
  File "/usr/lib/python3.6/site-packages/gi/module.py", line 154, in
__getattr__
    assert g_type == TYPE_NONE
AssertionError

For what it's worth, i'm running on Arch, with:
* python-gobject 3.26.0
* gst-python 1.12.3 (i also tried with git gst-python built in
/home/ubicast/gst/master/gst-python)

$ echo $PYTHONPATH
:/usr/lib/python3.6/site-packages:/home/ubicast/gst/master/gst-python

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