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WIP: #77837: fix removing directories on WIN32 #125864

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Campbell Barton wants to merge 1 commits from ideasman42/blender:pr-77837-fix into main
pull from: ideasman42/blender:pr-77837-fix
merge into: blender:main

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Campbell Barton commented 2024-08-04 14:31:24 +02:00
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Campbell Barton added 3 commits 2024-08-04 14:31:35 +02:00 
Regression from [0], removed the fix for #123827.

[0]: 08b75549e3
Resolve error when overwriting existing Python modules would attempt
to recursively remove a symlink which raised an error.

Related to #123827, same error but for extensions.
Fix #77837: Removing addons/extension/wheels failed on WIN32
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b5959b42bf 
When deleting files on WIN32, open files cannot be removed.
This is especially a problem for compiled Python modules which
remain open once imported.

Previously it was not so common for add-ons to include compiled Python
modules however with extensions supporting Python-wheels, it's
increasingly likely users run into this.

Workaround the problem by:
- Scheduling the files for removal next time Blender starts.
- Renaming to prevent collisions if the same paths need to be reused
  (in if the extension is re-installed for example).

This is supported for:

- Extensions.
- Python wheels.
- Legacy user add-ons.
- App-templates.

Details:

- On startup, a file exists that indicates cleanup is needed.
  In the common case the file doesn't exist.
  Otherwise module paths are scanned for files to remove.

- Since errors resolving paths to remove could result in user data loss,
  ensure the paths are always within the (extension/addon/app-template)
  directory.

- File locking isn't used, if multiple Blender instances start at the
  same time and try to remove the same files, this won't cause errors.
  Even so, the file that causes cleanup on startup is immediately
  removed to avoid unnecessary overhead to avoid any unnecessary
  file-system operation for other Blender instances.

Also resolves #125049.
Campbell Barton commented 2024-08-04 14:32:07 +02:00
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@blender-bot build

@blender-bot build
Campbell Barton closed this pull request 2024-08-06 05:26:52 +02:00
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Reference: blender/blender#125864
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