Switch CI to astral-managed Python via setup-uv

.github/actions/setup-uv-python/action.yml

@@ -0,0 +1,42 @@
+name: Set up uv and managed Python
+description: >-
+  Pins uv (avoids the raw.githubusercontent.com manifest fetch on cache miss)
+  and proactively installs the requested Python so cached venvs created with
+  `uv venv` resolve their interpreter symlinks in jobs that only restore the
+  venv. setup-uv alone only sets UV_PYTHON, it does not actually fetch the
+  interpreter until uv first uses it, so jobs that just activate the venv
+  blow up with broken symlinks on cache hit.
+
+inputs:
+  python-version:
+    description: The Python version uv should install and use.
+    required: true
+  uv-version:
+    description: The uv version setup-uv should install.
+    required: true
+
+outputs:
+  python-version:
+    description: The Python version uv reports as installed.
+    value: ${{ steps.uv.outputs.python-version }}
+
+runs:
+  using: composite
+  steps:
+    - name: Set up uv
+      id: uv
+      uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
+      with:
+        version: ${{ inputs.uv-version }}
+        python-version: ${{ inputs.python-version }}
+        # Persist astral's managed Python across jobs so 'uv venv' below is
+        # fast on the second job onwards.
+        cache-python: true
+        # Lint-only and codegen jobs touch no Python deps, so the post-step
+        # cache save would otherwise abort the job.
+        ignore-nothing-to-cache: true
+    - name: Install Python interpreter
+      shell: bash
+      env:
+        PYTHON_VERSION: ${{ inputs.python-version }}
+      run: uv python install "${PYTHON_VERSION}"

.github/workflows/ci.yaml

@@ -37,7 +37,7 @@ on:
         type: boolean
 
 env:
-  CACHE_VERSION: 3
+  CACHE_VERSION: 4
   MYPY_CACHE_VERSION: 1
   HA_SHORT_VERSION: "2026.6"
   ADDITIONAL_PYTHON_VERSIONS: "[]"
@@ -89,6 +89,8 @@ jobs:
       mariadb_groups: ${{ steps.info.outputs.mariadb_groups }}
       postgresql_groups: ${{ steps.info.outputs.postgresql_groups }}
       python_versions: ${{ steps.info.outputs.python_versions }}
+      default_python: ${{ steps.info.outputs.default_python }}
+      uv_version: ${{ steps.info.outputs.uv_version }}
       test_full_suite: ${{ steps.info.outputs.test_full_suite }}
       test_group_count: ${{ steps.info.outputs.test_group_count }}
       test_groups: ${{ steps.info.outputs.test_groups }}
@@ -235,6 +237,11 @@ jobs:
           echo "postgresql_groups=${postgresql_groups}" >> $GITHUB_OUTPUT
           echo "python_versions: ${all_python_versions}"
           echo "python_versions=${all_python_versions}" >> $GITHUB_OUTPUT
+          echo "default_python: ${default_python}"
+          echo "default_python=${default_python}" >> $GITHUB_OUTPUT
+          uv_version=$(grep '^uv==' requirements.txt | cut -d'=' -f3)
+          echo "uv_version: ${uv_version}"
+          echo "uv_version=${uv_version}" >> $GITHUB_OUTPUT
           echo "test_full_suite: ${test_full_suite}"
           echo "test_full_suite=${test_full_suite}" >> $GITHUB_OUTPUT
           echo "integrations_glob: ${integrations_glob}"
@@ -344,12 +351,12 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - name: Set up Python ${{ matrix.python-version }}
+      - name: Set up uv and Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
+          uv-version: ${{ needs.info.outputs.uv_version }}
           python-version: ${{ matrix.python-version }}
-          check-latest: true
       - name: Restore base Python virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -397,21 +404,13 @@ jobs:
             libudev-dev
           version: ${{ env.APT_CACHE_VERSION }}
           execute_install_scripts: true
-      - name: Read uv version from requirements.txt
-        if: steps.cache-venv.outputs.cache-hit != 'true'
-        id: read-uv-version
-        run: |
-          echo "version=$(grep '^uv==' requirements.txt | cut -d'=' -f3)" >> "$GITHUB_OUTPUT"
-      - name: Set up uv
-        if: steps.cache-venv.outputs.cache-hit != 'true'
-        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
-        with:
-          version: ${{ steps.read-uv-version.outputs.version }}
       - name: Create Python virtual environment
         if: steps.cache-venv.outputs.cache-hit != 'true'
         id: create-venv
+        env:
+          PYTHON_VERSION: ${{ steps.python.outputs.python-version }}
         run: |
-          python -m venv venv
+          uv venv venv --python "${PYTHON_VERSION}"
           . venv/bin/activate
           python --version
           uv pip install -U "pip>=25.2"
@@ -420,7 +419,6 @@ jobs:
           uv pip install -e . --config-settings editable_mode=compat
       - name: Dump pip freeze
         run: |
-          python -m venv venv
           . venv/bin/activate
           python --version
           uv pip freeze >> pip_freeze.txt
@@ -481,10 +479,10 @@ jobs:
           version: ${{ env.APT_CACHE_VERSION }}
       - name: Set up Python
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
-          python-version-file: ".python-version"
-          check-latest: true
+          uv-version: ${{ needs.info.outputs.uv_version }}
+          python-version: ${{ needs.info.outputs.default_python }}
       - name: Restore full Python virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -518,10 +516,10 @@ jobs:
           persist-credentials: false
       - name: Set up Python
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
-          python-version-file: ".python-version"
-          check-latest: true
+          uv-version: ${{ needs.info.outputs.uv_version }}
+          python-version: ${{ needs.info.outputs.default_python }}
       - name: Restore full Python virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -554,10 +552,10 @@ jobs:
           persist-credentials: false
       - name: Set up Python
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
-          python-version-file: ".python-version"
-          check-latest: true
+          uv-version: ${{ needs.info.outputs.uv_version }}
+          python-version: ${{ needs.info.outputs.default_python }}
       - name: Run gen_copilot_instructions.py
         run: |
           python -m script.gen_copilot_instructions validate
@@ -609,10 +607,10 @@ jobs:
           persist-credentials: false
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
+          uv-version: ${{ needs.info.outputs.uv_version }}
           python-version: ${{ matrix.python-version }}
-          check-latest: true
       - name: Restore full Python ${{ matrix.python-version }} virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -660,10 +658,10 @@ jobs:
           persist-credentials: false
       - name: Set up Python
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
-          python-version-file: ".python-version"
-          check-latest: true
+          uv-version: ${{ needs.info.outputs.uv_version }}
+          python-version: ${{ needs.info.outputs.default_python }}
       - name: Restore full Python virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -713,10 +711,10 @@ jobs:
           persist-credentials: false
       - name: Set up Python
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
-          python-version-file: ".python-version"
-          check-latest: true
+          uv-version: ${{ needs.info.outputs.uv_version }}
+          python-version: ${{ needs.info.outputs.default_python }}
       - name: Restore full Python virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -764,10 +762,10 @@ jobs:
           persist-credentials: false
       - name: Set up Python
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
-          python-version-file: ".python-version"
-          check-latest: true
+          uv-version: ${{ needs.info.outputs.uv_version }}
+          python-version: ${{ needs.info.outputs.default_python }}
       - name: Generate partial mypy restore key
         id: generate-mypy-key
         run: |
@@ -841,10 +839,10 @@ jobs:
           execute_install_scripts: true
       - name: Set up Python
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
-          python-version-file: ".python-version"
-          check-latest: true
+          uv-version: ${{ needs.info.outputs.uv_version }}
+          python-version: ${{ needs.info.outputs.default_python }}
       - name: Restore full Python virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -906,10 +904,10 @@ jobs:
           execute_install_scripts: true
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
+          uv-version: ${{ needs.info.outputs.uv_version }}
           python-version: ${{ matrix.python-version }}
-          check-latest: true
       - name: Restore full Python ${{ matrix.python-version }} virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -1048,10 +1046,10 @@ jobs:
           execute_install_scripts: true
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
+          uv-version: ${{ needs.info.outputs.uv_version }}
           python-version: ${{ matrix.python-version }}
-          check-latest: true
       - name: Restore full Python ${{ matrix.python-version }} virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -1204,10 +1202,10 @@ jobs:
           version: ${{ env.APT_CACHE_VERSION }}
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
+          uv-version: ${{ needs.info.outputs.uv_version }}
           python-version: ${{ matrix.python-version }}
-          check-latest: true
       - name: Restore full Python ${{ matrix.python-version }} virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
@@ -1372,10 +1370,10 @@ jobs:
           execute_install_scripts: true
       - name: Set up Python ${{ matrix.python-version }}
         id: python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        uses: ./.github/actions/setup-uv-python
         with:
+          uv-version: ${{ needs.info.outputs.uv_version }}
           python-version: ${{ matrix.python-version }}
-          check-latest: true
       - name: Restore full Python ${{ matrix.python-version }} virtual environment
         id: cache-venv
         uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5