ci: use optimized caching strategy for Poetry

.cirrus.yml

@@ -41,7 +41,6 @@ tests_task:
     - echo "PATH=${POETRY_HOME}/bin:${PATH}" >> $CIRRUS_ENV
 
   setup_environment_script:
-    # FIXME: --sync is broken due to a bug with py-sqlite3 packaging.
     # TODO: caching
     - poetry install
     - poetry env info

.github/actions/bootstrap-poetry/action.yml

@@ -3,29 +3,34 @@ description: Configure the environment with the specified Python and Poetry vers
 
 inputs:
   python-version:
-    description: Desired Python version
-    default: "3.12"
+    description: Desired Python version expression
+    default: '3.12'
   python-latest:
     description: Use an uncached Python if a newer match is available
     default: 'false'
+  python-prereleases:
+    description: Allow usage of pre-release Python versions
+    default: 'false'
   poetry-spec:
     description: pip-compatible installation specification to use for Poetry
     default: 'poetry'
 
 runs:
   using: composite
   steps:
+    - uses: actions/setup-python@v5
+      id: setup-python
+      with:
+        python-version: ${{ inputs.python-version }}
+        check-latest: ${{ inputs.python-latest == 'true' }}
+        allow-prereleases: ${{ inputs.python-prereleases == 'true' }}
+        update-environment: false
+
+    - run: pipx install --python '${{ steps.setup-python.outputs.python-path }}' '${{ inputs.poetry-spec }}'
+      shell: bash
+
     # Enable handling long path names (+260 char) on the Windows platform
     # https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#maximum-path-length-limitation
     - run: git config --system core.longpaths true
       if: runner.os == 'Windows'
       shell: pwsh
-
-    - run: pipx install '${{ inputs.poetry-spec }}'
-      shell: bash
-
-    - uses: actions/setup-python@v5
-      with:
-        python-version: ${{ inputs.python-version }}
-        check-latest: ${{ inputs.python-latest == 'true' }}
-        cache: poetry

.github/actions/poetry-install/action.yml

@@ -0,0 +1,42 @@
+name: Poetry Install
+description: Run `poetry install` with optional artifact and metadata caching
+
+inputs:
+  args:
+    description: Arguments for `poetry install`
+  cache:
+    description: Enable transparent Poetry artifact and metadata caching
+    default: 'true'
+
+outputs:
+  cache-hit:
+    description: Whether an exact cache hit occured
+    value: ${{ steps.cache.outputs.cache-hit }}
+
+runs:
+  using: composite
+  steps:
+    - run: printf 'cache-dir=%s\n' "$(poetry config cache-dir)" >> $GITHUB_OUTPUT
+      id: poetry-config
+      shell: bash
+
+    - uses: actions/cache@v4
+      id: cache
+      if: inputs.cache == 'true'
+      with:
+        path: ${{ steps.poetry-config.outputs.cache-dir }}/{artifacts,cache}
+        key: poetry-${{ runner.os }}-py${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('pyproject.toml', 'poetry.lock') }}
+        restore-keys: |
+          poetry-${{ runner.os }}-py${{ steps.setup-python.outputs.python-version }}-
+          poetry-${{ runner.os }}-
+          poetry-
+        enableCrossOsArchive: true
+
+    - run: poetry install ${{ inputs.args }}
+      shell: bash
+
+    - run: poetry env info
+      shell: bash
+
+    - run: poetry show
+      shell: bash

.github/workflows/.tests-matrix.yaml

@@ -34,18 +34,14 @@ jobs:
         with:
           python-version: ${{ inputs.python-version }}
 
-      - run: poetry install --sync
-
-      - run: poetry env info
-
-      - run: poetry show
+      - uses: ./.github/actions/poetry-install
 
       - uses: actions/cache@v4
         with:
           path: .mypy_cache
-          key: mypy-${{ runner.os }}-${{ env.pythonLocation }}-${{ hashFiles('pyproject.toml', 'poetry.lock') }}
+          key: mypy-${{ runner.os }}-py${{ inputs.python-version }}-${{ hashFiles('pyproject.toml', 'poetry.lock') }}
           restore-keys: |
-            mypy-${{ runner.os }}-${{ env.pythonLocation }}-
+            mypy-${{ runner.os }}-py${{ inputs.python-version }}-
             mypy-${{ runner.os }}-
 
       - run: poetry run mypy
@@ -61,11 +57,9 @@ jobs:
         with:
           python-version: ${{ inputs.python-version }}
 
-      - run: poetry install --sync --with github-actions
-
-      - run: poetry env info
-
-      - run: poetry show
+      - uses: ./.github/actions/poetry-install
+        with:
+          args: --with github-actions
 
       - run: poetry run pytest --integration -v
         env:
@@ -85,11 +79,9 @@ jobs:
         with:
           python-version: ${{ inputs.python-version }}
 
-      - run: poetry install --sync --with github-actions
-
-      - run: poetry env info
-
-      - run: poetry show
+      - uses: ./.github/actions/poetry-install
+        with:
+          args: --with github-actions
 
       - run: poetry run pip list --format json | jq -r '.[] | "\(.name)=\(.version)"' >> $GITHUB_OUTPUT
         id: package-versions

.github/workflows/docs.yaml

@@ -46,7 +46,9 @@ jobs:
 
       - uses: ./.github/actions/bootstrap-poetry
 
-      - run: poetry install --sync --no-root --only main
+      - uses: ./.github/actions/poetry-install
+        with:
+          args: --no-root --only main
 
       - name: website-build
         run: |

.github/workflows/tests.yaml

@@ -80,7 +80,9 @@ jobs:
 
       - uses: ./.github/actions/bootstrap-poetry
 
-      - run: poetry install --sync --only main,test
+      - uses: ./.github/actions/poetry-install
+        with:
+          args: --only main,test
 
       - run: poetry run env PYTHONPATH="$GITHUB_WORKSPACE" python tests/repositories/fixtures/pypi.org/generate.py