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juergbi pushed a commit to branch jbilleter/python-3.9
in repository https://gitbox.apache.org/repos/asf/buildstream.git

commit b2be0673ea01ca02dd1f24bca224c267e09de7ca
Author: Jürg Billeter <[email protected]>
AuthorDate: Sun Nov 2 18:58:11 2025 +0100

    Drop support for Python 3.9
    
    Python 3.9 is no longer maintained upstream and at least one Python
    package (Click) has dropped support for it.
---
 .github/common.env                                |  4 +--
 .github/compose/ci.docker-compose.yml             |  5 ---
 .github/workflows/ci.yml                          |  1 -
 .github/workflows/release.yml                     |  1 -
 doc/source/main_install.rst                       |  2 +-
 pyproject.toml                                    |  3 +-
 requirements/requirements.in                      |  1 -
 setup.py                                          |  5 ++-
 src/buildstream/_pluginfactory/pluginoriginpip.py |  5 +--
 tests/conftest.py                                 |  5 +--
 tox.ini                                           | 40 +++++++++++------------
 11 files changed, 29 insertions(+), 43 deletions(-)

diff --git a/.github/common.env b/.github/common.env
index 1bd0bc72b..152504fd6 100644
--- a/.github/common.env
+++ b/.github/common.env
@@ -1,6 +1,6 @@
 # Shared common variables
 
 CI_IMAGE_VERSION=master-2057058575
-CI_TOXENV_MAIN=py39,py310,py311,py312,py313,py314
-CI_TOXENV_PLUGINS=py39-plugins,py310-plugins,py311-plugins,py312-plugins,py313-plugins,py314-plugins
+CI_TOXENV_MAIN=py310,py311,py312,py313,py314
+CI_TOXENV_PLUGINS=py310-plugins,py311-plugins,py312-plugins,py313-plugins,py314-plugins
 CI_TOXENV_ALL="${CI_TOXENV_MAIN},${CI_TOXENV_PLUGINS}"
diff --git a/.github/compose/ci.docker-compose.yml 
b/.github/compose/ci.docker-compose.yml
index 69f7016f9..e9797bd58 100644
--- a/.github/compose/ci.docker-compose.yml
+++ b/.github/compose/ci.docker-compose.yml
@@ -98,11 +98,6 @@ services:
   # on the PyPA official 'manylinux' images that define the base ABI for
   # Python binary packages.
 
-  wheels-manylinux_2_28-cp39:
-    <<: *tests-template
-    image: quay.io/pypa/manylinux_2_28_x86_64
-    command: .github/wheel-helpers/test-wheel-manylinux.sh cp39 
/opt/python/cp39-cp39/bin/python3
-
   wheels-manylinux_2_28-cp310:
     <<: *tests-template
     image: quay.io/pypa/manylinux_2_28_x86_64
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 58540ebd0..07faedc0a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -153,7 +153,6 @@ jobs:
         # The names here should map to a valid service defined in
         # "../compose/ci.docker-compose.yml"
         test-name:
-          - wheels-manylinux_2_28-cp39
           - wheels-manylinux_2_28-cp310
           - wheels-manylinux_2_28-cp311
           - wheels-manylinux_2_28-cp312
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9b81151f6..7de62f6e7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -89,7 +89,6 @@ jobs:
         # The names here should map to a valid service defined in
         # "../compose/ci.docker-compose.yml"
         test-name:
-          - wheels-manylinux_2_28-cp39
           - wheels-manylinux_2_28-cp310
           - wheels-manylinux_2_28-cp311
           - wheels-manylinux_2_28-cp312
diff --git a/doc/source/main_install.rst b/doc/source/main_install.rst
index 6bf635811..7714c6cd6 100644
--- a/doc/source/main_install.rst
+++ b/doc/source/main_install.rst
@@ -35,7 +35,7 @@ Runtime requirements
 
 BuildStream requires the following Python environment to run:
 
-- python3 >= 3.9
+- python3 >= 3.10
 - PyPI packages as specified in
   `requirements.in 
<https://github.com/apache/buildstream/blob/master/requirements/requirements.in>`_.
 
diff --git a/pyproject.toml b/pyproject.toml
index 7c6008b57..5f4204bf5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,10 +53,11 @@ environment = { BST_BUNDLE_BUILDBOX = "1" }
 manylinux-x86_64-image = "manylinux_2_28"
 
 skip = [
-  # BuildStream supports Python >= 3.9
+  # BuildStream supports Python >= 3.10
   "cp36-*",
   "cp37-*",
   "cp38-*",
+  "cp39-*",
   # PyPy may work, but nobody is testing it so avoid distributing prebuilt 
binaries.
   "pp*",
   # Skipping this niche archicture ~halves overall build time.
diff --git a/requirements/requirements.in b/requirements/requirements.in
index 232bbc4b2..73b011fda 100644
--- a/requirements/requirements.in
+++ b/requirements/requirements.in
@@ -1,7 +1,6 @@
 Click >= 7.0, != 8.2.2
 grpcio
 Jinja2 >= 2.10
-importlib_metadata >= 3.6; python_version < "3.10"
 packaging
 pluginbase
 protobuf <9,>=5.29
diff --git a/setup.py b/setup.py
index 3c6aecb95..e8162f237 100755
--- a/setup.py
+++ b/setup.py
@@ -44,10 +44,10 @@ if version.startswith("0+untagged"):
 # Python requirements
 ##################################################################
 REQUIRED_PYTHON_MAJOR = 3
-REQUIRED_PYTHON_MINOR = 9
+REQUIRED_PYTHON_MINOR = 10
 
 if sys.version_info[0] != REQUIRED_PYTHON_MAJOR or sys.version_info[1] < 
REQUIRED_PYTHON_MINOR:
-    print("BuildStream requires Python >= 3.9")
+    print("BuildStream requires Python >= 3.10")
     sys.exit(1)
 
 try:
@@ -322,7 +322,6 @@ setup(
         "License :: OSI Approved :: Apache Software License",
         "Operating System :: POSIX",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
diff --git a/src/buildstream/_pluginfactory/pluginoriginpip.py 
b/src/buildstream/_pluginfactory/pluginoriginpip.py
index 2fe4563cd..998d9bf7d 100644
--- a/src/buildstream/_pluginfactory/pluginoriginpip.py
+++ b/src/buildstream/_pluginfactory/pluginoriginpip.py
@@ -35,10 +35,7 @@ class PluginOriginPip(PluginOrigin):
 
         from packaging.requirements import Requirement, InvalidRequirement
 
-        if sys.version_info >= (3, 10):
-            from importlib.metadata import distribution, PackageNotFoundError
-        else:
-            from importlib_metadata import distribution, PackageNotFoundError
+        from importlib.metadata import distribution, PackageNotFoundError
 
         # Sources and elements are looked up in separate
         # entrypoint groups from the same package.
diff --git a/tests/conftest.py b/tests/conftest.py
index aa8e60838..cef7dfbef 100755
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -29,10 +29,7 @@ from buildstream._testing.integration import 
integration_cache  # pylint: disabl
 
 from tests.testutils.repo.tar import Tar
 
-if sys.version_info >= (3, 10):
-    from importlib.metadata import entry_points
-else:
-    from importlib_metadata import entry_points
+from importlib.metadata import entry_points
 
 
 #
diff --git a/tox.ini b/tox.ini
index 62362f64e..bb67161da 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,7 +16,7 @@
 # Tox global configuration
 #
 [tox]
-envlist = py{39,310,311,312,313,314}
+envlist = py{310,311,312,313,314}
 skip_missing_interpreters = true
 isolated_build = true
 
@@ -33,30 +33,30 @@ BST_PLUGINS_VERSION = 
79649529cffb695d0d22195ed9a4910c80ca6907 # 2.5.0
 [testenv]
 usedevelop =
     # This is required by Cython in order to get coverage for cython files.
-    py{39,310,311,312,313,314}-!nocover: True
+    py{310,311,312,313,314}-!nocover: True
 
 commands =
     # Running with coverage reporting enabled
-    py{39,310,311,312,313,314}-!plugins-!nocover: pytest --basetemp 
{envtmpdir} --cov=buildstream --cov-config .coveragerc {posargs}
+    py{310,311,312,313,314}-!plugins-!nocover: pytest --basetemp {envtmpdir} 
--cov=buildstream --cov-config .coveragerc {posargs}
     # Running with coverage reporting disabled
-    py{39,310,311,312,313,314}-!plugins-nocover: pytest --basetemp {envtmpdir} 
{posargs}
+    py{310,311,312,313,314}-!plugins-nocover: pytest --basetemp {envtmpdir} 
{posargs}
     # Running external plugins tests with coverage reporting enabled
-    py{39,310,311,312,313,314}-plugins-!nocover: pytest --basetemp {envtmpdir} 
--cov=buildstream --cov-config .coveragerc --plugins {posargs}
+    py{310,311,312,313,314}-plugins-!nocover: pytest --basetemp {envtmpdir} 
--cov=buildstream --cov-config .coveragerc --plugins {posargs}
     # Running external plugins tests with coverage disabled
-    py{39,310,311,312,313,314}-plugins-nocover: pytest --basetemp {envtmpdir} 
--plugins {posargs}
+    py{310,311,312,313,314}-plugins-nocover: pytest --basetemp {envtmpdir} 
--plugins {posargs}
 commands_post:
-    py{39,310,311,312,313,314}-!nocover: mkdir -p .coverage-reports
-    py{39,310,311,312,313,314}-!nocover: mv {envtmpdir}/.coverage 
{toxinidir}/.coverage-reports/.coverage.{env:COVERAGE_PREFIX:}{envname}
+    py{310,311,312,313,314}-!nocover: mkdir -p .coverage-reports
+    py{310,311,312,313,314}-!nocover: mv {envtmpdir}/.coverage 
{toxinidir}/.coverage-reports/.coverage.{env:COVERAGE_PREFIX:}{envname}
 deps =
-    py{39,310,311,312,313,314}: -rrequirements/requirements.txt
-    py{39,310,311,312,313,314}: -rrequirements/dev-requirements.txt
-    py{39,310,311,312,313,314}: 
git+https://github.com/apache/buildstream-plugins.git@{env:BST_PLUGINS_VERSION:{[config]BST_PLUGINS_VERSION}}
+    py{310,311,312,313,314}: -rrequirements/requirements.txt
+    py{310,311,312,313,314}: -rrequirements/dev-requirements.txt
+    py{310,311,312,313,314}: 
git+https://github.com/apache/buildstream-plugins.git@{env:BST_PLUGINS_VERSION:{[config]BST_PLUGINS_VERSION}}
 
     # Install local sample plugins for testing pip plugin origins
-    py{39,310,311,312,313,314}: {toxinidir}/tests/plugins/sample-plugins
+    py{310,311,312,313,314}: {toxinidir}/tests/plugins/sample-plugins
 
     # Install external plugins for plugin tests
-    py{39,310,311,312,313,314}-plugins: 
git+https://gitlab.com/buildstream/buildstream-plugins-community.git@{env:BST_PLUGINS_COMMUNITY_VERSION:{[config]BST_PLUGINS_COMMUNITY_VERSION}}#egg=bst_plugins_community[deb]
+    py{310,311,312,313,314}-plugins: 
git+https://gitlab.com/buildstream/buildstream-plugins-community.git@{env:BST_PLUGINS_COMMUNITY_VERSION:{[config]BST_PLUGINS_COMMUNITY_VERSION}}#egg=bst_plugins_community[deb]
 
     # Only require coverage and pytest-cov when using it
     !nocover: -rrequirements/cov-requirements.txt
@@ -84,18 +84,18 @@ passenv =
 # These keys are not inherited by any other sections
 #
 setenv =
-    py{39,310,311,312,313,314}: COVERAGE_FILE = {envtmpdir}/.coverage
-    py{39,310,311,312,313,314}: BST_TEST_HOME = {envtmpdir}
-    py{39,310,311,312,313,314}: BST_TEST_XDG_CACHE_HOME = {envtmpdir}/cache
-    py{39,310,311,312,313,314}: BST_TEST_XDG_CONFIG_HOME = {envtmpdir}/config
-    py{39,310,311,312,313,314}: BST_TEST_XDG_DATA_HOME = {envtmpdir}/share
+    py{310,311,312,313,314}: COVERAGE_FILE = {envtmpdir}/.coverage
+    py{310,311,312,313,314}: BST_TEST_HOME = {envtmpdir}
+    py{310,311,312,313,314}: BST_TEST_XDG_CACHE_HOME = {envtmpdir}/cache
+    py{310,311,312,313,314}: BST_TEST_XDG_CONFIG_HOME = {envtmpdir}/config
+    py{310,311,312,313,314}: BST_TEST_XDG_DATA_HOME = {envtmpdir}/share
 
     # This is required to get coverage for Cython
-    py{39,310,311,312,313,314}-!nocover: BST_CYTHON_TRACE = 1
+    py{310,311,312,313,314}-!nocover: BST_CYTHON_TRACE = 1
     randomized: PYTEST_ADDOPTS="--random-order-bucket=global"
 
 allowlist_externals =
-    py{39,310,311,312,313,314}:
+    py{310,311,312,313,314}:
         mv
         mkdir
 

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