Auto-generate THIRD_PARTY_LICENSES_RUST_CRATES.html nightly

.github/workflows/ci.yml

@@ -50,29 +50,3 @@ jobs:
     - run: cargo install --locked --version "~0.17" cargo-audit
     - run: cargo audit --ignore RUSTSEC-2020-0159 --ignore RUSTSEC-2020-0071
 
-  license:
-    name: Check dependencies for licenses
-    runs-on: ubuntu-latest
-    outputs:
-      license_changed: ${{ steps.license_diff.outputs.license_changed }}
-    steps:
-    - uses: actions/checkout@v3
-    - uses: dtolnay/rust-toolchain@stable
-    - uses: Swatinem/rust-cache@v2
-    - run: cargo install --locked --version "~0.5" cargo-about
-    - run: cargo about generate --workspace --output-file "${{ runner.temp }}/licenses.html" about.hbs
-    - id: license_diff
-      run: |
-        if diff -q THIRD_PARTY_LICENSES_RUST_CRATES.html ${{ runner.temp }}/licenses.html ; then
-          echo "license_changed=NO" >> $GITHUB_OUTPUT
-        else
-          echo "license_changed=YES" >> $GITHUB_OUTPUT
-        fi
-
-  license_update:
-    name: Check if rust crates license files needs updates
-    runs-on: ubuntu-latest
-    needs: license
-    continue-on-error: true
-    steps:
-      - run: test "${{ needs.license.outputs.license_changed }}" == "NO"

.github/workflows/license_update.yml

@@ -0,0 +1,54 @@
+name: Update THIRD_PARTY_LICENSES_RUST_CRATES.html
+on:
+  schedule:
+    # Run the job every midnight.
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  update_license:
+    name: Update THIRD_PARTY_LICENSES_RUST_CRATES.html
+    permissions:
+      contents: write
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      # Clone the repository and check if THIRD_PARTY_LICENSES_RUST_CRATES.html
+      # is up-to-date.
+      - uses: actions/[email protected]
+        with:
+          persist-credentials: false
+      - run: cargo install --locked --version "~0.5" cargo-about
+      - run: cargo about generate --workspace --output-file THIRD_PARTY_LICENSES_RUST_CRATES.html about.hbs
+      - id: checkgitdiff # Early exit if there is no diff.
+        run: |
+          git diff --exit-code --quiet
+          [ $? -eq 0 ] && {
+            echo "THIRD_PARTY_LICENSES_RUST_CRATES.html is up-to-date."
+            gh run cancel ${{ github.run_id }}
+            gh run watch ${{ github.run_id }}
+          }
+        continue-on-error: true
+      # Delete existing rust-crates-license-update branch.
+      - uses: dawidd6/action-delete-branch@v3
+        with:
+          github_token: ${{github.token}}
+          branches: rust-crates-license-update
+      # Create a new PR.
+      - uses: gr2m/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          # https://github.com/actions/checkout/pull/1184
+          author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
+          branch: rust-crates-license-update
+          title: 'doc: update THIRD_PARTY_LICENSES_RUST_CRATES.html'
+          body: >
+            THIRD_PARTY_LICENSES_RUST_CRATES.html needs an update. This is an automatically generated PR by
+            a GitHub Action.
+          commit-message: 'doc: update THIRD_PARTY_LICENSES_RUST_CRATES.html'
+
+