glTF export crashes with Python NameError

Description:

I'm trying to export a camera animation to a .glb file using the glTF-Blender-IO core add-on. After clicking the "Export glTF 2.0" button in the export dialog, no file is generated and instead a Python error occurs that I can view using the info panel in the bottom of the screen. The following three errors are listed in this order:

Python: Traceback (most recent call last):
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/__init__.py", line 1336, in draw
    export_panel_data(layout, operator)
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/__init__.py", line 1412, in export_panel_data
    if is_draco_available():
       ^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/__init__.py", line 161, in is_draco_available
    is_draco_available.draco_exists = gltf2_io_draco_compression_extension.dll_exists()
                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/io/com/draco.py", line 69, in dll_exists
    path = dll_path()
           ^^^^^^^^^^
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/io/com/draco.py", line 38, in dll_path
    path = f"{site.getsitepackages()[0]}/libextern_draco.so"
              ^^^^
NameError: name 'site' is not defined. Did you mean: 'aiter'? Or did you forget to import 'site'?


Python: Traceback (most recent call last):
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/__init__.py", line 1336, in draw
    export_panel_data(layout, operator)
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/__init__.py", line 1412, in export_panel_data
    if is_draco_available():
       ^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/__init__.py", line 161, in is_draco_available
    is_draco_available.draco_exists = gltf2_io_draco_compression_extension.dll_exists()
                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/io/com/draco.py", line 69, in dll_exists
    path = dll_path()
           ^^^^^^^^^^
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/io/com/draco.py", line 38, in dll_path
    path = f"{site.getsitepackages()[0]}/libextern_draco.so"
              ^^^^
NameError: name 'site' is not defined. Did you mean: 'aiter'? Or did you forget to import 'site'?



Python: Traceback (most recent call last):
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/__init__.py", line 1108, in execute
    if is_draco_available():
       ^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/__init__.py", line 161, in is_draco_available
    is_draco_available.draco_exists = gltf2_io_draco_compression_extension.dll_exists()
                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/io/com/draco.py", line 69, in dll_exists
    path = dll_path()
           ^^^^^^^^^^
  File "/usr/share/blender/4.3/scripts/addons_core/io_scene_gltf2/io/com/draco.py", line 38, in dll_path
    path = f"{site.getsitepackages()[0]}/libextern_draco.so"
              ^^^^
NameError: name 'site' is not defined. Did you mean: 'aiter'? Or did you forget to import 'site'?

This process worked just fine when I tried it on version 17:4.2.3-4, the error only occurs now on version 17:4.3.0-1.

It looks like the issue is related to the force-draco2.patch. There, the module site is used, but the patched file does not contain import site. Therefore I assume that the issue is in the arch package as opposed to upstream.

Additional info:

• package version(s):

17:4.3.0-1

$ blender --version
Blender 4.3.0
        build date: 2024-11-20
        build time: 14:24:09
        build commit date: 2024-11-19
        build commit time: 08:52
        build hash: 2b18cad88b13
        build branch: makepkg (modified)
        build platform: Linux
        build type: Release
        build c flags:  -Wall -Werror=implicit-function-declaration -Wstrict-prototypes -Werror=return-type -Werror=vla -Wmissing-prototypes -Wno-char-subscripts -Wno-unknown-pragmas -Wpointer-arith -Wunused-parameter -Wwrite-strings -Wlogical-op -Wundef -Winit-self -Wmissing-include-dirs -Wno-div-by-zero -Wtype-limits -Wformat-signedness -Wrestrict -Wno-stringop-overread -Wno-stringop-overflow -Wnonnull -Wabsolute-value -Wuninitialized -Wredundant-decls -Wshadow -Wimplicit-fallthrough=5 -Wno-error=unused-but-set-variable -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions         -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security         -fstack-clash-protection -fcf-protection         -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g -ffile-prefix-map=/build/blender/src=/usr/src/debug/blender -march=x86-64-v2 -fopenmp -std=gnu11 -pipe -fPIC -funsigned-char -fno-strict-aliasing -ffp-contract=off  
        build c++ flags:  -Wuninitialized -Wredundant-decls -Wall -Wno-invalid-offsetof -Wno-sign-compare -Wlogical-op -Winit-self -Wmissing-include-dirs -Wno-div-by-zero -Wtype-limits -Werror=return-type -Wno-char-subscripts -Wno-unknown-pragmas -Wpointer-arith -Wunused-parameter -Wwrite-strings -Wundef -Wcomma-subscript -Wformat-signedness -Wrestrict -Wno-suggest-override -Wuninitialized -Wno-stringop-overread -Wno-stringop-overflow -Wimplicit-fallthrough=5 -Wundef -Wmissing-declarations -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions         -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security         -fstack-clash-protection -fcf-protection         -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer  -g -ffile-prefix-map=/build/blender/src=/usr/src/debug/blender -march=x86-64-v2 -fopenmp -pipe -fPIC -funsigned-char -fno-strict-aliasing -ffp-contract=off  
        build link flags:  -Wl,--version-script='/build/blender/src/blender/source/creator/symbols_unix.map' -latomic
        build system: CMake

• config: Error persists after deleting the ~/.config/blender/4.3 directory.

Steps to reproduce:

1. Open blender without any cli arguments
2. Create a simple camera keyframe animation, or open the attached .blend file camera-test-animation.blend
3. Select "File" -> "Export" -> "glTF 2.0 (.glb/.gltf)
4. Leave the options to the right at the defaults (format .glb, animation checked) and define an export filename
5. Press "Export glTF 2.0"
6. An error information quickly pops up and the bottom toolbar turns red
7. Click the bottom toolbar to view the error details. Observe that no file has been created.

added priority3-normal severity4-low statusunconfirmed labels

assigned to @freswa, @toolybird, and @gromit

changed the description

I can also replicate this issue.

This issue seems to be resolved by importing site in scripts/addons_core/io_scene_gltf2/io/com/draco.py

added scoperegression statusconfirmed labels and removed statusunconfirmed label

assigned to @svenstaro and unassigned @freswa, @toolybird, and @gromit

closed with commit 1293eafc