Add Github Actions to update schema

.gitattributes

@@ -4,6 +4,7 @@ src/__Private/CodegenCLI.hack export-ignore
 src/codegen/data/ export-ignore
 tests/ export-ignore
 codegen/**/* linguist-generated
+codegen-no-rebuild/**/* linguist-generated
 .hhconfig export-ignore
 .hhvmconfig.hdf export-ignore
 *.hack linguist-language=Hack

.github/workflows/build-and-test.yml

@@ -3,17 +3,31 @@ on:
   push:
   pull_request:
   schedule:
-    - cron: '42 15 * * *'
+    - cron: "42 15 * * *"
 jobs:
+  determine-latest-breaking-hhvm-version:
+    runs-on: ubuntu-latest
+    outputs:
+      latest-breaking-hhvm-version: ${{steps.determine-latest-breaking-hhvm-version.outputs.latest-breaking-hhvm-version}}
+    steps:
+      - uses: actions/checkout@v3
+      - id: determine-latest-breaking-hhvm-version
+        run: |
+          [[ \
+            "$(<codegen-no-rebuild/latest_breaking_version.hack)" \
+            =~ const\ string\ LATEST_BREAKING_HHVM_VERSION\ =\ \'([0-9]+\.[0-9]+)\. \
+          ]] && \
+          echo "::set-output name=latest-breaking-hhvm-version::${BASH_REMATCH[1]}"
   build:
+    needs: determine-latest-breaking-hhvm-version
     name: HHVM ${{matrix.hhvm}} - ${{matrix.os}}
     strategy:
       # Run tests on all OS's and HHVM versions, even if one fails
       fail-fast: false
       matrix:
-        os: [ ubuntu , macos ]
+        os: [ubuntu, macos]
         hhvm:
-          - '4.158'
+          - ${{needs.determine-latest-breaking-hhvm-version.outputs.latest-breaking-hhvm-version}}
           - latest
           - nightly
     runs-on: ${{matrix.os}}-latest
@@ -28,3 +42,45 @@ jobs:
         run: bin/hhast-lint
       - name: Check for manually modified codegen
         run: vendor/bin/hh-codegen-verify-signatures codegen/
+  update-schema:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: hhvm/actions/hack-lint-test@master
+        with:
+          hhvm: nightly
+          skip_lint: true
+          skip_tests: true
+      - if: github.event_name == 'pull_request'
+        run: bin/update-codegen
+      - if: github.event_name == 'pull_request'
+        uses: reviewdog/action-suggester@v1
+        with:
+          tool_name: Update schema
+      - if: github.event_name != 'pull_request'
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+          repository: facebook/hhvm
+          path: ./.var/tmp/hhvm
+      - if: github.event_name != 'pull_request'
+        run: bin/update-schema --hhvm-path=./.var/tmp/hhvm
+      - if: github.event_name != 'pull_request'
+        uses: peter-evans/create-pull-request@v4
+        with:
+          branch: update-schema/${{github.ref_name}}
+          title: Update schema
+          commit-message: Update schema
+      - if: github.event_name != 'pull_request'
+        run: git checkout -B "${{github.ref_name}}"
+      - if: github.event_name != 'pull_request'
+        run: bin/update-codegen --dont-update-ast --update-latest-breaking-version
+      - if: github.event_name != 'pull_request'
+        uses: peter-evans/create-pull-request@v4
+        with:
+          branch: update-latest-breaking-version/${{github.ref_name}}
+          title: Update schema to a backward incompatible version
+          commit-message: Update the latest breaking version
+          body: |
+            This PR updates assumes the latest schema is a breaking change.
+            Feel free to close this PR if the schema is actually backward compatible with previous schema versions.