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Blender is ignoring PYTHONPYCACHEPREFIX #124953

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opened 2024-07-18 05:01:26 +02:00 by Phil Stopford · 5 comments
Phil Stopford commented 2024-07-18 05:01:26 +02:00
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System Information
Operating system: Linux-6.9.9-arch1-1-x86_64-with-glibc2.39 64 Bits, WAYLAND UI
Graphics card: AMD Radeon Graphics (radeonsi, renoir, LLVM 18.1.8, DRM 3.57, 6.9.9-arch1-1) AMD 4.6 (Core Profile) Mesa 24.1.3-arch1.1

Blender Version
Broken: version: 4.2.0, branch: blender-v4.2-release, commit date: 2024-07-16 06:20, hash: a51f293548ad
Worked: (newest version of Blender that worked as expected)

Short description of error
PYTHONPYCACHEPREFIX was added in Python 3.8 to allow pycache files to be kept in a user-defined location. This environment variable is being ignored by blender, causing pycache files to 'contaminate' the .config/blender/4.2/scripts/addons directory.

This is particularly problematic if the addons directory is being shared by multiple blender sessions (e.g. via Google Drive sync or similar). The contention over the python cache files causes all kinds of trouble.

Reference for the variable and its expected behavior: https://peps.python.org/pep-0304/

Exact steps for others to reproduce the error
Set PYTHONPYCACHEPREFIX to point to a existing file system location, e.g.
mkdir /var/tmp/pycache
export PYTHONPYCACHEPREFIX=/var/tmp/pycache/

Check contents of the PYTHONPYCACHEPREFIX directory. There will be no files from blender.

**System Information** Operating system: Linux-6.9.9-arch1-1-x86_64-with-glibc2.39 64 Bits, WAYLAND UI Graphics card: AMD Radeon Graphics (radeonsi, renoir, LLVM 18.1.8, DRM 3.57, 6.9.9-arch1-1) AMD 4.6 (Core Profile) Mesa 24.1.3-arch1.1 **Blender Version** Broken: version: 4.2.0, branch: blender-v4.2-release, commit date: 2024-07-16 06:20, hash: `a51f293548ad` Worked: (newest version of Blender that worked as expected) **Short description of error** PYTHONPYCACHEPREFIX was added in Python 3.8 to allow pycache files to be kept in a user-defined location. This environment variable is being ignored by blender, causing pycache files to 'contaminate' the .config/blender/4.2/scripts/addons directory. This is particularly problematic if the addons directory is being shared by multiple blender sessions (e.g. via Google Drive sync or similar). The contention over the python cache files causes all kinds of trouble. Reference for the variable and its expected behavior: https://peps.python.org/pep-0304/ **Exact steps for others to reproduce the error** Set PYTHONPYCACHEPREFIX to point to a existing file system location, e.g. mkdir /var/tmp/pycache export PYTHONPYCACHEPREFIX=/var/tmp/pycache/ Check contents of the PYTHONPYCACHEPREFIX directory. There will be no files from blender.
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 labels 2024-07-18 05:01:26 +02:00
Campbell Barton commented 2024-07-18 07:07:42 +02:00
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This works when running Blender with Python system environment enabled.
blender --python-use-system-env

Closing.

This works when running Blender with Python system environment enabled. `blender --python-use-system-env` Closing.
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 labels 2024-07-18 07:07:47 +02:00
Phil Stopford commented 2024-07-18 15:53:22 +02:00
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Oh, interesting. Was there an explicit change / motivation that causes this to be needed now when it wasn't before? It seemed like a bug just because the behavior changed from previous versions.

Oh, interesting. Was there an explicit change / motivation that causes this to be needed now when it wasn't before? It seemed like a bug just because the behavior changed from previous versions.
Campbell Barton commented 2024-07-19 01:43:15 +02:00
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See 7c2f0074f3 & #72807 for the motivation.

See 7c2f0074f3fe2411daa7a6e351d7cbc535246871 & #72807 for the motivation.
Phil Stopford commented 2024-07-19 03:29:32 +02:00
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Thanks. Oddly, though, 4.1.1 seems to behave OK, so this is why I filed the bug for 4.2. Something seemed to have changed, but those links are fairly elderly. Hence still somewhat confused - there would appear to be a distinct difference between 4.1.1 and 4.2.

Thanks. Oddly, though, 4.1.1 seems to behave OK, so this is why I filed the bug for 4.2. Something seemed to have changed, but those links are fairly elderly. Hence still somewhat confused - there would appear to be a distinct difference between 4.1.1 and 4.2.
Campbell Barton commented 2024-07-19 04:41:28 +02:00
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Most likely caused by a regression, fixed by: cd5dd6e454

Most likely caused by a regression, fixed by: cd5dd6e454f75167b9b3cc008deff1aba42f5461
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Reference: blender/blender#124953
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