Package: blender
Version: 5.2.2+dfsg-1
Severity: normal
Blender 5.2.2 imports cattrs and requests, and the package depends on neither.
On a sid system with blender installed (Recommends included), every start
prints this and the core Extensions add-on stays off:
Traceback (most recent call last):
File "/usr/share/blender/scripts/modules/addon_utils.py", line 544, in enable
mod.register()
File "/usr/share/blender/scripts/addons_core/bl_pkg/__init__.py", line 986,
in register
_remote_asset_library_restore_backups()
File "/usr/share/blender/scripts/addons_core/bl_pkg/__init__.py", line 580,
in _remote_asset_library_restore_backups
from _bpy_internal.assets.remote_library import listing_downloader
File
"/usr/share/blender/scripts/modules/_bpy_internal/assets/remote_library/listing_downloader.py",
line 32, in <module>
from _bpy_internal.http import downloader as http_dl
File "/usr/share/blender/scripts/modules/_bpy_internal/http/downloader.py",
line 51, in <module>
import cattrs
ModuleNotFoundError: No module named 'cattrs'
Exception in module register():
/usr/share/blender/scripts/addons_core/bl_pkg/__init__.py
The same code imports cattrs.preconf.json, and json_parsing.py and
cli_listing_generator.py in the same directory import cattrs too.
With python3-cattr installed, the add-on fails at the next line of
downloader.py, `import requests`.
With python3-cattr and python3-requests installed, Blender starts without the
error, in the background and with its interface.
Reproduce: in sid, `apt install blender`, then `blender -b --factory-startup
--python-expr 'import bpy'`.
Versions: blender and blender-data 5.2.2+dfsg-1, python3 3.14.7-3,
python3-cattr 26.2.1-1, python3-requests 2.34.2-1.
Adding python3-cattr and python3-requests to blender's Depends would fix it.
I found and checked this with the help of an AI assistant (Claude); the runs
above are in our test containers on Debian sid.
Daniel
These runs were in a Debian sid container; the kernel shown is the host's.
-- System Information:
Debian Release: forky/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 7.3.0-rc6-stereo3d8 (SMP w/12 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: unable to detect
Versions of packages blender depends on:
ii blender-data 5.2.2+dfsg-1
ii fonts-dejavu 2.37-9
ii libavcodec63 7:9.0.2-3
ii libavdevice63 7:9.0.2-3
ii libavformat63 7:9.0.2-3
ii libavutil61 7:9.0.2-3
ii libc6 2.43-7
ii libceres4t64 2.2.0+dfsg-6
ii libembree4-4 4.4.1+dfsg-3
ii libepoxy0 1.5.10-2+b2
ii libfftw3-double3 3.3.11-1
ii libfftw3-single3 3.3.11-1
ii libfmt11 11.1.1+ds1-2
ii libfreetype6 2.14.3+dfsg-3
ii libgcc-s1 16.2.0-3
ii libgflags2.2 2.2.2-3
ii libgmp10 2:6.3.0+dfsg-5+b2
ii libgoogle-glog0v6t64 0.6.0-3
ii libimath-3-2-30 3.2.2-3
ii libjack-jackd2-0 [libjack-0.125] 1.9.22~dfsg-6
ii libjpeg62-turbo 1:3.1.3-4
ii libopenal1 1:1.25.2-2
ii libopencolorio2.5 2.5.1+dfsg-4+b4
ii libopenexr-3-4-33 [libopenexr-3-4-33-imath-3-2] 3.4.15+ds-1+b1
ii libopenimageio3.1 3.1.18.1+dfsg-2
ii libopenjp2-7 2.5.4-1.1
ii libopenvdb13.0 13.0.0-3+b1
ii libopenxr-loader1 1.1.61~ds-1
ii libosdcpu3.6.0 3.6.0-3+b2
ii libosdgpu3.6.0 3.6.0-3+b2
ii libpng16-16t64 1.6.59-1
ii libpotrace0 1.16-2+b3
ii libpugixml1v5 1.16-1
ii libpulse0 17.0+dfsg1-3
ii libpython3.14 3.14.8-1
ii libshaderc1 2026.4-1
ii libsndfile1 1.2.2-4+b1
ii libspnav0 1.2-1
ii libstdc++6 16.2.0-3
ii libswscale10 7:9.0.2-3
ii libtbb12 2023.1.0-3
ii libtbbmalloc2 2023.1.0-3
ii libvulkan1 1.4.363.0-1
ii libwebp7 1.6.0-0.1
ii libx11-6 2:1.8.13-1
ii libxfixes3 1:6.0.0-2+b5
ii libxi6 2:1.8.3-1
ii libxkbcommon0 1.13.1-1
ii libzstd1 1.5.7+dfsg-4
ii zlib1g 1:1.3.dfsg+really1.3.2-3
blender recommends no packages.
blender suggests no packages.
