gstreamer/subprojects/gst-python/gi/__init__.py
Thibault Saunier 1babccfe50 python: Fix using overrides when not building PyGObject
Since 547570cd79 we do not always build
PyGObject and our development environment is broken when trying to use
GStreamer python when built against system PyGObject with the following
error importing Gst in there:

```
12345678** (gst-plugin-scanner:710617): CRITICAL **: 11:45:02.343: can't find gi.repository.Gst
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/gi/repository/__init__.py", line 23, in <module>
    from ..importer import DynamicImporter
  File "/usr/lib64/python3.9/site-packages/gi/importer.py", line 33, in <module>
    from .overrides import load_overrides
ImportError: cannot import name 'load_overrides' from 'gi.overrides' (/var/home/thiblahute/devel/gstreamer/gstreamer/subprojects/gst-editing-services/bindings/python/gi/overrides/__init__.py)
Factory Details:
```

The approach to fixing it is to implement override `gi` in
`gst-python/gi/` which we add to `PYTHONPATH`) and in there reset the
`gi` module to the right place and we get overrides from paths from
`_GI_OVERRIDES_PATH` we set in `gst-env.py` which points to all the
overrides that will be installed.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1155>
2021-10-15 20:51:41 +00:00

45 lines
1.2 KiB
Python

import gi
import os
import sys
import imp
from pathlib import Path
# Remove this dummy module the python path and
# try to import the actual gi module
sys.path.remove(str(Path(__file__).parents[1]))
del sys.modules["gi"]
import gi
class GstOverrideImport:
def find_module(self, fullname, path=None, target=None):
if fullname.startswith('gi.overrides'):
fp = None
try:
fp, _, _ = imp.find_module(fullname.split(
'.')[-1], os.environ.get('_GI_OVERRIDES_PATH', '').split(os.pathsep),)
except ImportError:
return None
finally:
if fp:
fp.close()
return self
return None
def load_module(self, name):
if name in sys.modules:
return sys.modules[name]
fp, pathname, description = imp.find_module(name.split(
'.')[-1], os.environ.get('_GI_OVERRIDES_PATH', '').split(os.pathsep),)
try:
module = imp.load_module(name, fp, pathname, description)
finally:
if fp:
fp.close()
sys.modules[name] = module
return module
sys.meta_path.insert(0, GstOverrideImport())