Auto-publish releases to Homebrew (#725)

.github/workflows/release.yml

@@ -3,27 +3,57 @@ on:
   release:
     types: [published]
 jobs:
-  build_release:
+  pypi:
     name: Build aliBuild release and publish it on Pypi
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/')
     steps:
-      - uses: actions/checkout@master
-      - name: Set up Python 3.7
+      - name: Checkout alibuild
+        uses: actions/checkout@v2
+      - name: Set up Python
         uses: actions/setup-python@v1
         with:
-          python-version: 3.7
-      - name: Replace the tag in the setup.py
-        run: >-
-          GITHUB_TAG=`echo $GITHUB_REF | cut -f3 -d/` ;
-          echo $GITHUB_TAG ;
-          perl -p -i -e "s/LAST_TAG/$GITHUB_TAG/g" alibuild_helpers/__init__.py
-      - name: Build the python distribution
-        run: >-
-          python setup.py sdist
-      - name: Publish distribution 📦 to PyPI
-        if: startsWith(github.ref, 'refs/tags')
-        uses: pypa/gh-action-pypi-publish@master
+          python-version: 3.9
+      - name: Replace the hard-coded version number
+        run: sed -i "s/LAST_TAG/${GITHUB_REF#refs/tags/}/g" alibuild_helpers/__init__.py
+      - name: Build the Python distribution
+        run: python setup.py sdist
+      - name: Publish distribution to PyPI
+        uses: pypa/gh-action-pypi-publish@v1.4.2
         with:
           user: __token__
           password: ${{ secrets.pypi_password }}
-
+  brew:
+    name: Update alibuild Homebrew formula
+    needs: pypi
+    runs-on: macos-latest
+    if: startsWith(github.ref, 'refs/tags/') && !github.event.release.prerelease
+    steps:
+      - name: Checkout Homebrew repo
+        run: brew tap alisw/system-deps
+      - name: Update alibuild formula with new version
+        run: |
+          set -x
+          cd "$(dirname "$(brew formula alibuild)")"
+          IFS=$'\n' read -r sha url < \
+            <(curl -fSsL "https://pypi.org/pypi/alibuild/${GITHUB_REF#refs/tags/}/json" |
+                jq -r '.urls[0] | (.digests.sha256, .url)')
+          # Replace keys with two leading spaces only, so we get the toplevel
+          # ones applying to alibuild, not those for dependencies.
+          sed -i.bak "
+          s/^  url .*/  url \"$url\"/;
+          s/^  sha256 .*/  sha256 \"$sha\"/;
+          s/^  version .*/  version \"${GITHUB_REF#refs/tags/v}\"/
+          " alibuild.rb
+          rm -f alibuild.rb.bak
+          brew update-python-resources alibuild
+      - name: Push updated formula
+        run: |
+          set -x
+          cd "$(dirname "$(brew formula alibuild)")"
+          git add alibuild.rb
+          git commit -m "Update alibuild to ${GITHUB_REF#refs/tags/}"
+          git show
+          git push https://alibuild:$GITHUB_TOKEN@github.com/alisw/homebrew-system-deps master
+        env:
+          GITHUB_TOKEN: ${{ secrets.homebrew_repo_token }}