Lift minimal Python version to 3.9

We were carrying support for down to 3.6 long enough now. By now even
modern enterprise distros which still have older Python under
maintenance also have a path to install a second, fresher version. At
the same time, old Python blocked some renovation, e.g. that of the
setup system [1].

Choose 3.9 as new lower boundary. It does not restrict us with cleaning,
and it is the oldest still maintained upstream version.

[1] https://groups.google.com/g/kas-devel/c/h6J9XB0h-W4/m/IwAqU0kwDwAJ

Signed-off-by: Jan Kiszka <[email protected]>

.github/workflows/next.yml

@@ -32,26 +32,12 @@ jobs:
     - name: Check code
       run: scripts/checkcode.sh .
 
-  perform_tests_legacy:
-    name: Legacy Python
-    runs-on: ubuntu-20.04
-    strategy:
-      matrix:
-        python-version: ["3.6", "3.7"]
-    steps:
-      - name: Check out repo
-        uses: actions/checkout@v4
-      - name: Run tests
-        uses: ./.github/actions/perform-tests
-        with:
-          python-version: ${{ matrix.python-version }}
-
-  perform_tests_modern:
+  perform_tests:
     name: Modern Python
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
       - name: Check out repo
         uses: actions/checkout@v4
@@ -64,8 +50,7 @@ jobs:
     name: Build, test and deploy container images
     needs:
       - codestyle
-      - perform_tests_legacy
-      - perform_tests_modern
+      - perform_tests
     runs-on: ubuntu-24.04
     permissions:
       id-token: write

setup.py

@@ -1,6 +1,6 @@
 # kas - setup tool for bitbake based projects
 #
-# Copyright (c) Siemens AG, 2017-2019
+# Copyright (c) Siemens AG, 2017-2025
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -29,7 +29,7 @@
 from kas import __version__
 
 __license__ = 'MIT'
-__copyright__ = 'Copyright (c) Siemens AG, 2017-2019'
+__copyright__ = 'Copyright (c) Siemens AG, 2017-2025'
 
 HERE = path.abspath(path.dirname(__file__))
 with open(path.join(HERE, 'README.rst')) as f:
@@ -66,9 +66,6 @@
         'License :: OSI Approved :: MIT License',
 
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
-        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
@@ -92,10 +89,9 @@
         'distro>=1.0.0,<2',
         'jsonschema>=2.5.0,<5',
         'kconfiglib>=14.1.0,<15',
-        'GitPython>=3.1.0,<4',
-        "cached-property>=1.0,<2; python_version<'3.8'"
+        'GitPython>=3.1.0,<4'
     ],
 
-    # At least python 3.6 is needed by now:
-    python_requires='>=3.6',
+    # At least python 3.9 is needed by now:
+    python_requires='>=3.9',
 )