Add check for migrator filename uniqueness

.github/workflows/migrator_uniqueness.yml

@@ -0,0 +1,66 @@
+name: Check Migration Filename Uniqueness
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  migrator-name-uniqueness-check:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
+    env:
+      GH_TOKEN: ${{ github.token }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # fetch full history so we can diff properly
+
+      - name: Fetch base branch
+        run: |
+          git fetch origin ${{ github.base_ref }} --depth=1
+
+      - name: Find newly added migration files
+        id: find_migrators
+        run: |
+          # Diff only added files between base branch and PR HEAD
+          new_migrators=$(git diff --name-only --diff-filter=A origin/${{ github.base_ref }}...HEAD | grep '^recipe/migrations/' || true)
+
+          echo "Found new migrators:"
+          echo "$new_migrators"
+
+          echo "new_migrators=$new_migrators" >> $GITHUB_OUTPUT
+
+      - name: Search for existing uses of that migrator in conda-forge
+        if: steps.find_migrators.outputs.new_migrators != ''
+        run: |
+          failed=0
+          for m in ${{ steps.find_migrators.outputs.new_migrators }}; do
+            migrator=$(basename "$m")
+            echo "Checking for existing uses of migrator $migrator in conda-forge..."
+
+            # Search in GH-org with exact path where migrators end up
+            # https://stackoverflow.com/a/46317804
+            query=$(printf "org:conda-forge path:.ci_support/migrations/$migrator" | jq -sRr @uri)
+            response=$(curl -s -H "Accept: application/vnd.github.v3.raw" \
+                             -H "Authorization: token $GH_TOKEN" \
+                             "https://api.github.com/search/code?q=$query")
+            echo "Sent $query"
+            echo "Got $response"
+            num_hits=$(echo "$response" | jq '[.items[] | select(.repository.archived == false)] | length')
+
+            if [ "$num_hits" -gt 0 ]; then
+              echo "Found $num_hits existing occurrences of migrator $migrator in conda-forge"
+              failed=1
+            else
+              echo "No existing occurrences of $migrator found"
+            fi
+          done
+
+          if [ "$failed" -eq 1 ]; then
+            echo "Pre-existing uses of migration filename(s) found in conda-forge."
+            exit 1
+          fi

recipe/migrations/python314t.yaml

@@ -0,0 +1,49 @@
+migrator_ts: 1755739493
+__migrator:
+    commit_message: Rebuild for python 3.14 freethreading
+    migration_number: 1
+    operation: key_add
+    primary_key: python
+    ordering:
+        python:
+            - 3.9.* *_cpython
+            - 3.10.* *_cpython
+            - 3.11.* *_cpython
+            - 3.12.* *_cpython
+            - 3.13.* *_cp313
+            - 3.13.* *_cp313t
+            - 3.14.* *_cp314    # new entry
+            - 3.14.* *_cp314t   # new entry
+    paused: true
+    longterm: true
+    pr_limit: 20
+    max_solver_attempts: 3  # this will make the bot retry "not solvable" stuff 12 times
+    exclude:
+        # this shouldn't attempt to modify the python feedstocks
+        - python
+        - pypy3.6
+        - pypy-meta
+        - cross-python
+        - python_abi
+    exclude_pinned_pkgs: false
+    # if feedstock already has 3.13t migrator this is redundant, but harmless
+    additional_zip_keys:
+        - is_freethreading
+        - is_abi3
+    wait_for_migrators:
+        - python314
+    ignored_deps_per_node:
+        matplotlib:
+            - pyqt
+
+python:
+- 3.14.* *_cp314t
+# additional entries to add for zip_keys
+is_freethreading:
+- true
+is_python_min:
+- false
+is_abi3:
+- false
+channel_sources:
+- conda-forge,conda-forge/label/python_rc