python3: Ensure stale empty python module directories don't break the build

There are two issues inside importlib. Firstly, the modules are accessed in
on disk order. This means behaviour seen on one system might not reproduce
on another and is a real headache.

Secondly, empty directories left behind by previous modules might be looked
at. This has caused a long string of different issues for us.

As a result, patch this to a behaviour which works for us. Upstream discussion
can follow later, this is breaking builds for too many people to leave unpatched.

[YOCTO #14816]

(From OE-Core rev: e5944a38db513e033c3a3e9313267055f7254be7)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/meta/recipes-devtools/python/python3/deterministic_imports.patch b/meta/recipes-devtools/python/python3/deterministic_imports.patch
new file mode 100644
index 0000000000..296b413cab
--- /dev/null
+++ b/meta/recipes-devtools/python/python3/deterministic_imports.patch
@@ -0,0 +1,32 @@
+There are two issues here. Firstly, the modules are accessed in on disk order. This
+means behaviour seen on one system might not reproduce on another and is a real headache.
+
+Secondly, empty directories left behind by previous modules might be looked at. This
+has caused a long string of different issues for us.
+
+As a result, patch this to a behaviour which works for us.
+
+Upstream-Status: Pending [need to talk to upstream to see if they'll take one or both fixes]
+Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
+
+
+Index: Python-3.10.4/Lib/importlib/metadata/__init__.py
+===================================================================
+--- Python-3.10.4.orig/Lib/importlib/metadata/__init__.py
++++ Python-3.10.4/Lib/importlib/metadata/__init__.py
+@@ -819,7 +819,14 @@ class Lookup:
+         self.infos = FreezableDefaultDict(list)
+         self.eggs = FreezableDefaultDict(list)
+ 
+-        for child in path.children():
++        for child in sorted(path.children()):
++            childpath = pathlib.Path(path.root, child)
++            try:
++                if childpath.is_dir() and not any(childpath.iterdir()):
++                    # Empty directories aren't interesting
++                    continue
++            except PermissionError:
++                continue
+             low = child.lower()
+             if low.endswith((".dist-info", ".egg-info")):
+                 # rpartition is faster than splitext and suitable for this purpose.