Not sure why, but today I got almost systematic deadlocks in the
ProcessPoolExecutor calls (and similar issues with direct usage of
multiprocessing)... For now synchronous single process will do.
- Paths of C++-parsed files were not properly 'unixified' on Windows.
This was bad both for changes noisyness in PO files, and broke on
the un-escaping of `\n` and `\t` sequences.
- The `ProcessPoolExecutor` starts sub-processes differently on Linux
than on Windows or OSX. While Linux's `fork` keeps the same
environment (i.e. all Blender stuff remains available in workers
subprocesses), the 'spawn' used on Windows (and reportedly OSX) starts
a new bare python interpreter. This means that code executed by these
needs to be Blender-agnostic to be portable.
The only thing that is currently known broken on non-Linux platforms is
the RTL processing of some languages like Arabic or Hebrew.
Changes to an extensions manifest weren't accounted for.
This was particularly a problem for "System" extensions which aren't
intended to be managed inside Blender however the problem existed for
any changes made outside of Blender.
Now enabled extensions are checked on startup to ensure:
- They are compatible with Blender.
- The Python wheels are synchronized.
Resolves#123645.
Details:
- Any extension incompatibilities prevent the add-on being enabled
with a message printing the reason for it being disabled.
- Incompatible add-ons are kept enabled in the preferences to avoid
loosing their own preferences and allow for an upgrade to restore
compatibility.
- To avoid slowing down Blender's startup:
- Checks are skipped when no extensions are enabled
(as is the case for `--factory-startup` & running tests).
- Compatibility data is cached so in common case,
the cache is loaded and all enabled extensions `stat` their
manifests to detect changes without having to parse them.
- The cache is re-generated if any extensions change or the
Blender/Python version changes.
- Compatibility data is updated:
- On startup (when needed).
- On an explicit "Refresh Local"
(mainly for developers who may edit the manifest).
- When refreshing extensions after install/uninstall etc.
since an incompatible extensions may become compatible
after an update.
- When reloading preferences.
- Additional info is shown when the `--debug-python` is enabled,
if there are ever issues with the extension compatibility cache
generation not working as expected.
- The behavior for Python wheels has changed so they are only setup
when the extension is enabled. This was done to simplify startup
checks and has the benefit that an installed but disabled extension
never runs code - as the ability to install wheels means it could
have been imported from other scripts. It also means users can disable
an extension to avoid wheel version conflicts.
This does add the complication however that enabling add-on which is
an extension must first ensure it's wheels are setup.
See `addon_utils.extensions_refresh(..)`.
See code-comments for further details.
