From 0839de149116c0f2274bb8273654cabd60428815 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Wed, 17 Dec 2025 09:34:02 +0100
Subject: [PATCH 01/17] enable the min-deps ci

---
 .github/workflows/ci-additional.yaml | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/ci-additional.yaml b/.github/workflows/ci-additional.yaml
index 673959cf466..a6d677acc5b 100644
--- a/.github/workflows/ci-additional.yaml
+++ b/.github/workflows/ci-additional.yaml
@@ -245,9 +245,7 @@ jobs:
     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'
+    if: needs.detect-ci-trigger.outputs.triggered == 'false'
     defaults:
       run:
         shell: bash -l {0}
@@ -268,10 +266,12 @@ jobs:
         uses: xarray-contrib/minimum-dependency-versions@3db8e1c17328ee1e27dfe4db90d908644856eb61 # v1.0.0
         with:
           policy: ci/policy.yaml
-          environment-paths: ci/requirements/min-all-deps.yml
+          environments: pixi:test-py311-min-versions
+          manifest-path: pixi.toml
 
       - 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
+          environments: pixi:test-py311-bare-minimum
+          manifest-path: pixi.toml

From 2ed80a7f788b68caf64c0a8356385053cb0aa68d Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Wed, 17 Dec 2025 09:34:52 +0100
Subject: [PATCH 02/17] move array-api-strict to the `extras` feature

---
 pixi.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pixi.toml b/pixi.toml
index 443c8c8f211..7de82d57019 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -79,6 +79,7 @@ seaborn = "*"
 [feature.extras.dependencies]
 # array
 sparse = "*"
+array-api-strict = "<2.4"
 
 # algorithms
 scipy = "*"
@@ -204,7 +205,6 @@ cartopy = "*"
 seaborn = "*"
 
 [feature.test.dependencies]
-array-api-strict = "*"
 pytest = "*"
 pytest-asyncio = "*"
 pytest-cov = "*"

From b7a40a89fa2e81375ef2bf91a1589cf80d0c47fd Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Wed, 17 Dec 2025 09:35:11 +0100
Subject: [PATCH 03/17] restructure the `extras` feature

---
 pixi.toml | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pixi.toml b/pixi.toml
index 7de82d57019..b2fa6a99613 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -79,6 +79,7 @@ seaborn = "*"
 [feature.extras.dependencies]
 # array
 sparse = "*"
+pint = "*"
 array-api-strict = "<2.4"
 
 # algorithms
@@ -88,9 +89,10 @@ toolz = "*"
 # tutorial
 pooch = "*"
 
-# other
+# calendar
 cftime = "*"
-pint = "*"
+
+# other
 iris = "*"
 
 [feature.extras.pypi-dependencies]

From 8e0c44a94c214bcd7ed5307e9b34eba37311808d Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Wed, 17 Dec 2025 09:35:30 +0100
Subject: [PATCH 04/17] [skip-rtd]


From afbee43b0e3aa77f854fd3a5c26e7f2d93f5ee78 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Wed, 17 Dec 2025 09:45:50 +0100
Subject: [PATCH 05/17] disable the ci trigger

---
 .github/workflows/ci-additional.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/ci-additional.yaml b/.github/workflows/ci-additional.yaml
index a6d677acc5b..6bd9f01f816 100644
--- a/.github/workflows/ci-additional.yaml
+++ b/.github/workflows/ci-additional.yaml
@@ -245,7 +245,7 @@ jobs:
     name: Minimum Version Policy
     runs-on: "ubuntu-latest"
     needs: detect-ci-trigger
-    if: needs.detect-ci-trigger.outputs.triggered == 'false'
+    # if: needs.detect-ci-trigger.outputs.triggered == 'false'
     defaults:
       run:
         shell: bash -l {0}

From 96c0c6dd154ce7f25ba7fd6f1cff456c101199f8 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Wed, 17 Dec 2025 09:46:39 +0100
Subject: [PATCH 06/17] [skip-rtd]


From 46767e856ec349a1f9058374df10c47bf67d14b7 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Wed, 17 Dec 2025 09:49:12 +0100
Subject: [PATCH 07/17] disable the trigger entirely [skip-rtd]

---
 .github/workflows/ci-additional.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/ci-additional.yaml b/.github/workflows/ci-additional.yaml
index 6bd9f01f816..546d728c925 100644
--- a/.github/workflows/ci-additional.yaml
+++ b/.github/workflows/ci-additional.yaml
@@ -244,7 +244,7 @@ jobs:
   min-version-policy:
     name: Minimum Version Policy
     runs-on: "ubuntu-latest"
-    needs: detect-ci-trigger
+    # needs: detect-ci-trigger
     # if: needs.detect-ci-trigger.outputs.triggered == 'false'
     defaults:
       run:

From b945d2bee8ce5268a80b2605810a17f306d85549 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 13:01:13 +0100
Subject: [PATCH 08/17] create a environment for the policy check

---
 pixi.toml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pixi.toml b/pixi.toml
index b2fa6a99613..2423632bdfd 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -294,6 +294,12 @@ 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.*"
+
 [environments]
 # Testing
 # test-just-xarray = { features = ["test"] } # https://github.com/pydata/xarray/pull/10888/files#r2511336147
@@ -394,3 +400,4 @@ 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 }

From 9ab5ed268d2ec1a94391866921dc48c80d51c229 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 13:01:25 +0100
Subject: [PATCH 09/17] define tasks for the different min-deps envs

---
 pixi.toml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pixi.toml b/pixi.toml
index 2423632bdfd..72a49ced65a 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -300,6 +300,11 @@ xarray-minimum-dependency-policy = "*"
 [feature.policy.dependencies]
 python = "3.13.*"
 
+[feature.policy.tasks]
+policy-bare-minimum = "minimum-versions validate --policy ci/policy.yaml --manifest-path pixi.toml pixi:test-py311-bare-minimum"
+policy-minimum-versions = "minimum-versions validate --policy ci/policy.yaml --manifest-path pixi.toml pixi:test-py311-min-versions"
+policy-bare-min-and-scipy = "minimum-versions validate --policy ci/policy.yaml --manifest-path pixi.toml pixi:test-py311-bare-min-and-scipy"
+
 [environments]
 # Testing
 # test-just-xarray = { features = ["test"] } # https://github.com/pydata/xarray/pull/10888/files#r2511336147

From 6e33dfe598d5a6b5c3056a80d3d774d37b7defb2 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 13:01:44 +0100
Subject: [PATCH 10/17] ignore `pytz` and `pytest-reportlog`

---
 ci/policy.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ci/policy.yaml b/ci/policy.yaml
index 5876e54505c..db853608624 100644
--- a/ci/policy.yaml
+++ b/ci/policy.yaml
@@ -24,5 +24,7 @@ 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: []

From 2a3dabdc65db862277fe83b22d5f524499d8fefd Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 13:13:18 +0100
Subject: [PATCH 11/17] combine the task definitions using dependent tasks

---
 pixi.toml | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/pixi.toml b/pixi.toml
index 72a49ced65a..8c6a643d6b1 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -300,10 +300,35 @@ 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 = "minimum-versions validate --policy ci/policy.yaml --manifest-path pixi.toml pixi:test-py311-bare-minimum"
-policy-minimum-versions = "minimum-versions validate --policy ci/policy.yaml --manifest-path pixi.toml pixi:test-py311-min-versions"
-policy-bare-min-and-scipy = "minimum-versions validate --policy ci/policy.yaml --manifest-path pixi.toml pixi:test-py311-bare-min-and-scipy"
+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

From bbbd528712ec5e6f8aa4ff4ce982f0fc4407d02f Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 13:17:00 +0100
Subject: [PATCH 12/17] refactor the min-versions job

---
 .github/workflows/ci-additional.yaml | 30 +++++++++++++++-------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/.github/workflows/ci-additional.yaml b/.github/workflows/ci-additional.yaml
index 546d728c925..7ef5d375703 100644
--- a/.github/workflows/ci-additional.yaml
+++ b/.github/workflows/ci-additional.yaml
@@ -244,6 +244,7 @@ jobs:
   min-version-policy:
     name: Minimum Version Policy
     runs-on: "ubuntu-latest"
+    needs: cache-pixi-lock
     # needs: detect-ci-trigger
     # if: needs.detect-ci-trigger.outputs.triggered == 'false'
     defaults:
@@ -258,20 +259,21 @@ jobs:
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
 
-      - uses: actions/setup-python@v6
-        with:
-          python-version: "3.x"
-
-      - name: All-deps minimum versions policy
-        uses: xarray-contrib/minimum-dependency-versions@3db8e1c17328ee1e27dfe4db90d908644856eb61 # v1.0.0
+      - uses: prefix-dev/setup-pixi@v0.9.3
         with:
-          policy: ci/policy.yaml
-          environments: pixi:test-py311-min-versions
-          manifest-path: pixi.toml
+          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
-          environments: pixi:test-py311-bare-minimum
-          manifest-path: pixi.toml
+        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

From bec61be4c7850beeb788cecdadb9c494080d8a77 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 13:20:24 +0100
Subject: [PATCH 13/17] restore the lock file

---
 .github/workflows/ci-additional.yaml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/.github/workflows/ci-additional.yaml b/.github/workflows/ci-additional.yaml
index 7ef5d375703..18b5a393732 100644
--- a/.github/workflows/ci-additional.yaml
+++ b/.github/workflows/ci-additional.yaml
@@ -259,6 +259,15 @@ jobs:
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
 
+      - name: Restore cached pixi lockfile
+        uses: actions/cache/restore@v5
+        id: restore-pixi-lock
+        with:
+          enableCrossOsArchive: true
+          path: |
+            pixi.lock
+          key: ${{ needs.cache-pixi-lock.outputs.cache-id }}
+
       - uses: prefix-dev/setup-pixi@v0.9.3
         with:
           pixi-version: ${{ env.PIXI_VERSION }}

From 654fb266f562ab81e73d3f77e41a1af169443768 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 13:25:36 +0100
Subject: [PATCH 14/17] ignore the policy violation for `array-api-strict`

---
 ci/policy.yaml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ci/policy.yaml b/ci/policy.yaml
index db853608624..0e0f81d8a1f 100644
--- a/ci/policy.yaml
+++ b/ci/policy.yaml
@@ -27,4 +27,5 @@ policy:
     - pytz
     - pytest-reportlog
   # these packages don't fail the CI, but will be printed in the report
-  ignored_violations: []
+  ignored_violations:
+    - array-api-strict

From 34dd1925dbc1241eb39471ea60c6115702de43e2 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 13:28:34 +0100
Subject: [PATCH 15/17] skip the min-versions policy checks along with all
 other ci

---
 .github/workflows/ci-additional.yaml | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/ci-additional.yaml b/.github/workflows/ci-additional.yaml
index 18b5a393732..106bb82124e 100644
--- a/.github/workflows/ci-additional.yaml
+++ b/.github/workflows/ci-additional.yaml
@@ -244,9 +244,8 @@ jobs:
   min-version-policy:
     name: Minimum Version Policy
     runs-on: "ubuntu-latest"
-    needs: cache-pixi-lock
-    # needs: detect-ci-trigger
-    # 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}

From 736c88b0c83bed8c965db670e0ecd906e508c734 Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 13:32:58 +0100
Subject: [PATCH 16/17] bad merge

---
 pixi.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pixi.toml b/pixi.toml
index 8c6a643d6b1..4f3e2de0257 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -80,7 +80,7 @@ seaborn = "*"
 # array
 sparse = "*"
 pint = "*"
-array-api-strict = "<2.4"
+array-api-strict = "*"
 
 # algorithms
 scipy = "*"

From 5cdf4fc7a5974539d83191bc95a3f8041ed5032d Mon Sep 17 00:00:00 2001
From: Justus Magin <keewis@posteo.de>
Date: Sat, 20 Dec 2025 14:15:33 +0100
Subject: [PATCH 17/17] remove outdated comment

---
 pixi.toml | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/pixi.toml b/pixi.toml
index 4f3e2de0257..a8d165e868f 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -109,11 +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.*"