[Debian-pan-maintainers] Debian: napari package: launcher brings error 'A distribution name is required'

[Emmanuel FARHI]

Hi Roland,

I've just tested the recent napari packages that have been prepared by 
yourself.

The installation goes as it should with packages:

    python3-app-model_0.2.0-2_all.deb python3-in-n-out_0.1.8-2_all.deb
    python3-napari-plugin-engine_0.2.0-3_all.deb
    python3-cachey_0.2.1-3_all.deb python3-magicgui_0.7.2-3_all.deb  
    python3-npe2_0.7.2-2_all.deb
    python3-docstring-parser_0.15-2_all.deb
    python3-napari_0.5.0~a1-3_all.deb python3-psygnal_0.9.1-2_all.deb

obtained from tracker.debian.org

Then I have created a small launcher script for the GUI itself:

    #!/usr/bin/python3

    # -*- coding: utf-8 -*-
    import re
    import sys
    from napari.__main__ import main
    if __name__ == '__main__':
         sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
         sys.exit(main())

In principle, the main GUI should be displayed (at least it does from a 
pip3 installation in a venv).

The execution in a vanilla Bookworm with Cinnamon brings an error:

Traceback (most recent call last):
   File "/home/lambda/Downloads/./napari.run", line 8, in <module>
     sys.exit(main())
              ^^^^^^
   File "/usr/lib/python3/dist-packages/napari/__main__.py", line 556, 
in main
     _maybe_rerun_with_macos_fixes()
   File "/usr/lib/python3/dist-packages/napari/__main__.py", line 442, 
in _maybe_rerun_with_macos_fixes
     from napari._qt import API_NAME
   File "/usr/lib/python3/dist-packages/napari/_qt/__init__.py", line 
64, in <module>
     from napari._qt.qt_event_loop import get_app, gui_qt, quit_app, run
   File "/usr/lib/python3/dist-packages/napari/_qt/qt_event_loop.py", 
line 14, in <module>
     from napari import Viewer, __version__
   File "<frozen importlib._bootstrap>", line 1231, in _handle_fromlist
   File "/usr/lib/python3/dist-packages/napari/_lazy.py", line 48, in 
__getattr__
     submod = import_module(
              ^^^^^^^^^^^^^^
   File "/usr/lib/python3.11/importlib/__init__.py", line 126, in 
import_module
     return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/lib/python3/dist-packages/napari/viewer.py", line 8, in 
<module>
     from napari.components.viewer_model import ViewerModel
   File "/usr/lib/python3/dist-packages/napari/components/__init__.py", 
line 19, in <module>
     from napari.components.layerlist import LayerList
   File "/usr/lib/python3/dist-packages/napari/components/layerlist.py", 
line 9, in <module>
     from napari.layers import Layer
   File "/usr/lib/python3/dist-packages/napari/layers/__init__.py", line 
10, in <module>
     from napari.layers.image import Image
   File 
"/usr/lib/python3/dist-packages/napari/layers/image/__init__.py", line 
1, in <module>
     from napari.layers.image import _image_key_bindings
   File 
"/usr/lib/python3/dist-packages/napari/layers/image/_image_key_bindings.py", 
line 7, in <module>
     from napari.layers.image.image import Image
   File "/usr/lib/python3/dist-packages/napari/layers/image/image.py", 
line 27, in <module>
     from napari.layers.image._image_slice import ImageSlice
   File 
"/usr/lib/python3/dist-packages/napari/layers/image/_image_slice.py", 
line 13, in <module>
     from napari.utils import config
   File "/usr/lib/python3/dist-packages/napari/utils/config.py", line 5, 
in <module>
     from napari.utils._octree import get_octree_config
   File "/usr/lib/python3/dist-packages/napari/utils/_octree.py", line 
11, in <module>
     from napari.settings import get_settings
   File "/usr/lib/python3/dist-packages/napari/settings/__init__.py", 
line 5, in <module>
     from napari.settings._napari_settings import (
   File 
"/usr/lib/python3/dist-packages/napari/settings/_napari_settings.py", 
line 16, in <module>
     from napari.settings._plugins import PluginsSettings
   File "/usr/lib/python3/dist-packages/napari/settings/_plugins.py", 
line 30, in <module>
     class PluginsSettings(EventedSettings):
   File "/usr/lib/python3/dist-packages/napari/settings/_plugins.py", 
line 78, in PluginsSettings
     class NapariConfig:
   File "/usr/lib/python3/dist-packages/napari/settings/_plugins.py", 
line 86, in NapariConfig
     if running_as_bundled_app() or running_as_constructor_app():
        ^^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/lib/python3/dist-packages/napari/utils/misc.py", line 72, 
in running_as_bundled_app
     metadata = importlib.metadata.metadata(app_module)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/lib/python3.11/importlib/metadata/__init__.py", line 998, 
in metadata
     return Distribution.from_name(distribution_name).metadata
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/usr/lib/python3.11/importlib/metadata/__init__.py", line 561, 
in from_name
     raise ValueError("A distribution name is required.")
ValueError: A distribution name is required.

I do not exactly know what is the issue. Any idea ?

Thanks, Emmanuel.

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