[Buildroot] [PATCH v2 2/3] package/python-zlmdb: don't install the vendored flatbuffers package

[Yegor Yefremov <yegorslists@googlemail.com>]

From: Yegor Yefremov <yegorslists@googlemail.com>

zlmdb installs a copy of the flatbuffers runtime as a top-level
"flatbuffers" package, which conflicts with python-flatbuffers that
python-zlmdb selects:

  FileExistsError: File already exists: .../target/usr/lib/python3.14/site-packages/flatbuffers/__init__.py

The overlap has been there since the package was added, but it became
fatal when setuptools packages were migrated to the pep517 installer,
which refuses to overwrite files.

Add a patch so that zlmdb doesn't install its copy and uses
python-flatbuffers instead.

Fixes: https://autobuild.buildroot.org/results/e3b026cb48f41ec531e5bdae9e07b8e581f1a06b
Fixes: 8937db8dd595 ("package/pkg-python.mk: migrate setuptools to pep517")

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Assisted-by: Claude:claude-opus-5-5
---
Changes v1 -> v2:
  - new patch: minimal fix for the flatbuffers conflict that can be
    backported to the LTS branches instead of the version bump
    (suggested by Thomas). Tested on master and 2025.02.x.

 ...all-the-vendored-flatbuffers-package.patch | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 package/python-zlmdb/0001-setup.py-don-t-install-the-vendored-flatbuffers-package.patch

diff --git a/package/python-zlmdb/0001-setup.py-don-t-install-the-vendored-flatbuffers-package.patch b/package/python-zlmdb/0001-setup.py-don-t-install-the-vendored-flatbuffers-package.patch
new file mode 100644
index 0000000000..608074ea51
--- /dev/null
+++ b/package/python-zlmdb/0001-setup.py-don-t-install-the-vendored-flatbuffers-package.patch
@@ -0,0 +1,37 @@
+From 18c4d2d3c7c0c3104e9280ea717c68a5d8f1368d Mon Sep 17 00:00:00 2001
+From: Yegor Yefremov <yegorslists@googlemail.com>
+Date: Wed, 14 Oct 2026 17:52:45 +0200
+Subject: [PATCH] setup.py: don't install the vendored flatbuffers package
+
+zlmdb installs a copy of the flatbuffers runtime as a top-level
+"flatbuffers" package, although it also depends on the flatbuffers
+package (install_requires). Both install
+site-packages/flatbuffers/__init__.py, so installing zlmdb on top of
+flatbuffers fails with a pep517 installer:
+
+  FileExistsError: File already exists: .../site-packages/flatbuffers/__init__.py
+
+Don't install the vendored copy and use the flatbuffers package
+instead. zlmdb.flatbuffers (the reflection code) is not affected.
+
+Upstream: N/A, since version 25.12.1 upstream no longer installs a
+top-level flatbuffers package (the runtime is vendored as
+zlmdb.flatbuffers).
+
+Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
+---
+ setup.py | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 16ed0cb..571615a 100644
+--- a/setup.py
++++ b/setup.py
+@@ -67,7 +67,6 @@ with open('requirements-dev.txt') as f:
+ test_requirements = ['pytest', 'pytest-runner']
+ 
+ packages = [
+-    'flatbuffers',
+     'zlmdb',
+     'zlmdb.flatbuffers',
+     'zlmdb.flatbuffers.reflection',
-- 
2.34.1

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