chore: create workflow to check showcase commit

.github/scripts/verify_showcase_version.go

@@ -0,0 +1,76 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func main() {
+	showcaseVersion := flag.String("version", "", "The showcase version from pom.xml (e.g. 0.39.0)")
+	showcaseCommit := flag.String("commit", "", "The showcase commit from librarian.yaml (e.g. 328bec...)")
+	flag.Parse()
+
+	if *showcaseVersion == "" || *showcaseCommit == "" {
+		fmt.Fprintf(os.Stderr, "Error: Both -version and -commit flags must be provided\n")
+		os.Exit(1)
+	}
+
+	tagName := "v" + *showcaseVersion
+	remoteUrl := "https://github.com/googleapis/gapic-showcase.git"
+
+	fmt.Printf("Showcase version: %s\n", *showcaseVersion)
+	fmt.Printf("Showcase commit: %s\n", *showcaseCommit)
+
+	// Query the remote gapic-showcase repository for the commit hash of the tag v{version}.
+	gitCommand := exec.Command("git", "ls-remote", remoteUrl, "refs/tags/"+tagName)
+	outputBytes, err := gitCommand.Output()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error running git ls-remote: %v\n", err)
+		os.Exit(1)
+	}
+
+	var expectedCommit string
+	for _, line := range strings.Split(strings.TrimSpace(string(outputBytes)), "\n") {
+		fields := strings.Fields(line)
+		if len(fields) < 2 {
+			continue
+		}
+		if fields[1] == "refs/tags/"+tagName+"^{}" {
+			expectedCommit = fields[0]
+			break
+		}
+		if fields[1] == "refs/tags/"+tagName {
+			expectedCommit = fields[0]
+		}
+	}
+
+	if expectedCommit == "" {
+		fmt.Fprintf(os.Stderr, "Error: Tag %s not found on remote %s\n", tagName, remoteUrl)
+		os.Exit(1)
+	}
+	fmt.Printf("Expected commit for tag %s: %s\n", tagName, expectedCommit)
+
+	if *showcaseCommit != expectedCommit {
+		fmt.Fprintf(os.Stderr, "Mismatch: librarian.yaml has commit %q, but tag %q is at commit %q\n", *showcaseCommit, tagName, expectedCommit)
+		os.Exit(2)
+	}
+
+	fmt.Println("Showcase version and commit are in sync!")
+}

.github/workflows/showcase-version-check.yaml

@@ -0,0 +1,88 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Showcase Version Check
+
+on:
+  schedule:
+    - cron: '30 3 * * *' # Run daily at 3:30 AM UTC
+  workflow_dispatch: # Allow manual trigger
+  pull_request:
+    paths:
+      - 'librarian.yaml'
+      - 'java-showcase/gapic-showcase/pom.xml'
+      - '.github/workflows/showcase-version-check.yaml'
+      - '.github/scripts/verify_showcase_version.go'
+
+jobs:
+  check-version:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Extract showcase version from pom.xml
+        id: extract_version
+        shell: bash
+        run: |
+          version=$(awk -F'[<>]' '/gapic-showcase.version/{print $3; exit}' java-showcase/gapic-showcase/pom.xml)
+          echo "version=$version" >> "$GITHUB_OUTPUT"
+      - name: Extract showcase commit from librarian.yaml
+        id: extract_commit
+        shell: bash
+        run: |
+          commit=$(grep -A 1 "showcase:" librarian.yaml | grep "commit:" | awk '{print $2}')
+          echo "commit=$commit" >> "$GITHUB_OUTPUT"
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.24'
+      - name: Verify showcase version and commit match
+        shell: bash
+        run: |
+          set +e
+          go run .github/scripts/verify_showcase_version.go \
+            -version "${{ steps.extract_version.outputs.version }}" \
+            -commit "${{ steps.extract_commit.outputs.commit }}"
+          exit_code=$?
+          set -e
+          if [ $exit_code -eq 0 ]; then
+            echo "Verification successful!"
+            exit 0
+          elif [ $exit_code -eq 2 ]; then
+            echo "MISMATCH=true" >> "$GITHUB_ENV"
+            echo "Error: Showcase version mismatch detected."
+            exit 2
+          else
+            echo "Error: Unexpected verification failure (exit code $exit_code)."
+            exit 1
+          fi
+      - name: Create issue on mismatch
+        if: failure() && env.MISMATCH == 'true'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh issue create \
+            -R "${{ github.repository }}" \
+            -t "Showcase Version Mismatch: librarian.yaml and pom.xml out of sync" \
+            -b "The Showcase version in java-showcase/gapic-showcase/pom.xml and the commit in librarian.yaml do not match. Please update them to match. See logs: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
+      - name: Create issue on workflow failure
+        if: failure() && env.MISMATCH != 'true'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh issue create \
+            -R "${{ github.repository }}" \
+            -t "Showcase Version Check Workflow Failure" \
+            -b "The Showcase Version Check workflow has failed due to an unexpected execution error. Please check the logs at ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }} for details."