re-enable the minimum versions ci (#11027)

* enable the min-deps ci

* move array-api-strict to the `extras` feature

* restructure the `extras` feature

* [skip-rtd]

* disable the ci trigger

* [skip-rtd]

* disable the trigger entirely [skip-rtd]

* create a environment for the policy check

* define tasks for the different min-deps envs

* ignore `pytz` and `pytest-reportlog`

* combine the task definitions using dependent tasks

* refactor the min-versions job

* restore the lock file

* ignore the policy violation for `array-api-strict`

* skip the min-versions policy checks along with all other ci

* bad merge

* remove outdated comment

Author: keewis

.github/workflows/ci-additional.yaml

@@ -244,10 +244,8 @@ jobs:
   min-version-policy:
     name: Minimum Version Policy
     runs-on: "ubuntu-latest"
-    needs: detect-ci-trigger
-    # min-version-policy doesn't work with Pixi yet https://github.com/pydata/xarray/pull/10888#discussion_r2504335457
-    if: false
-    # if: needs.detect-ci-trigger.outputs.triggered == 'false'
+    needs: [detect-ci-trigger, cache-pixi-lock]
+    if: needs.detect-ci-trigger.outputs.triggered == 'false'
     defaults:
       run:
         shell: bash -l {0}
@@ -260,18 +258,30 @@ jobs:
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
 
-      - uses: actions/setup-python@v6
+      - name: Restore cached pixi lockfile
+        uses: actions/cache/restore@v5
+        id: restore-pixi-lock
         with:
-          python-version: "3.x"
+          enableCrossOsArchive: true
+          path: |
+            pixi.lock
+          key: ${{ needs.cache-pixi-lock.outputs.cache-id }}
 
-      - name: All-deps minimum versions policy
-        uses: xarray-contrib/minimum-dependency-versions@3db8e1c17328ee1e27dfe4db90d908644856eb61 # v1.0.0
+      - uses: prefix-dev/[email protected]
         with:
-          policy: ci/policy.yaml
-          environment-paths: ci/requirements/min-all-deps.yml
+          pixi-version: ${{ env.PIXI_VERSION }}
+          cache: true
+          environments: "policy"
+          cache-write: ${{ github.event_name == 'push' && github.ref_name == 'main' }}
 
       - name: Bare minimum versions policy
-        uses: xarray-contrib/minimum-dependency-versions@3db8e1c17328ee1e27dfe4db90d908644856eb61 # v1.0.0
-        with:
-          policy: ci/policy.yaml
-          environment-paths: ci/requirements/bare-minimum.yml
+        run: |
+          pixi run policy-bare-minimum
+
+      - name: Bare minimum and scipy versions policy
+        run: |
+          pixi run policy-bare-min-and-scipy
+
+      - name: All-deps minimum versions policy
+        run: |
+          pixi run policy-min-versions

ci/policy.yaml

@@ -24,5 +24,8 @@ policy:
     - pytest-xdist
     - pytest-hypothesis
     - hypothesis
+    - pytz
+    - pytest-reportlog
   # these packages don't fail the CI, but will be printed in the report
-  ignored_violations: []
+  ignored_violations:
+    - array-api-strict

pixi.toml

@@ -79,6 +79,8 @@ seaborn = "*"
 [feature.extras.dependencies]
 # array
 sparse = "*"
+pint = "*"
+array-api-strict = "*"
 
 # algorithms
 scipy = "*"
@@ -87,9 +89,10 @@ toolz = "*"
 # tutorial
 pooch = "*"
 
-# other
+# calendar
 cftime = "*"
-pint = "*"
+
+# other
 iris = "*"
 
 [feature.extras.pypi-dependencies]
@@ -106,11 +109,6 @@ pandas = "2.2.*"
 scipy = "1.13.*"
 
 [feature.min-versions.dependencies]
-# minimal versions for all dependencies
-# Note that when you update min-supported versions, you should:
-# - Update the min version lower-bound in the corresponding feature(s) where applicable
-# - Update this section to pin to the min version
-
 array-api-strict = "2.4.*" # dependency for testing the array api compat
 boto3 = "1.34.*"
 bottleneck = "1.4.*"
@@ -204,7 +202,6 @@ cartopy = "*"
 seaborn = "*"
 
 [feature.test.dependencies]
-array-api-strict = "*"
 pytest = "*"
 pytest-asyncio = "*"
 pytest-cov = "*"
@@ -292,6 +289,42 @@ cytoolz = "*"
 [feature.release.tasks]
 release-contributors = "python ci/release_contributors.py"
 
+[feature.policy.pypi-dependencies]
+xarray-minimum-dependency-policy = "*"
+
+[feature.policy.dependencies]
+python = "3.13.*"
+
+[feature.policy.tasks.check-policy]
+cmd = "minimum-versions validate --policy ci/policy.yaml --manifest-path pixi.toml {{ env }}"
+args = ["env"]
+
+[feature.policy.tasks]
+policy-bare-minimum = [
+  { task = "check-policy", args = [
+    "pixi:test-py311-bare-minimum",
+  ] },
+]
+policy-bare-min-and-scipy = [
+  { task = "check-policy", args = [
+    "pixi:test-py311-bare-min-and-scipy",
+  ] },
+]
+policy-min-versions = [
+  { task = "check-policy", args = [
+    "pixi:test-py311-min-versions",
+  ] },
+]
+policy = [
+  { task = "check-policy", args = [
+    """\
+    pixi:test-py311-bare-minimum \
+    pixi:test-py311-bare-min-and-scipy \
+    pixi:test-py311-min-versions \
+    """,
+  ] },
+]
+
 [environments]
 # Testing
 # test-just-xarray = { features = ["test"] } # https://github.com/pydata/xarray/pull/10888/files#r2511336147
@@ -392,3 +425,4 @@ doc = { features = [
 ] }
 pre-commit = { features = ["pre-commit"], no-default-feature = true }
 release = { features = ["release"], no-default-feature = true }
+policy = { features = ["policy"], no-default-feature = true }