1 files changed, 47 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/ProjectUtil.java b/java/com/google/gerrit/server/ProjectUtil.java
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+++ b/java/com/google/gerrit/server/ProjectUtil.java
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+// Copyright (C) 2012 The Android Open Source Project
+//
+// 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 com.google.gerrit.server;
+
+import com.google.gerrit.reviewdb.client.Branch;
+import com.google.gerrit.reviewdb.client.RefNames;
+import com.google.gerrit.server.git.GitRepositoryManager;
+import java.io.IOException;
+import org.eclipse.jgit.errors.RepositoryNotFoundException;
+import org.eclipse.jgit.lib.Repository;
+
+public class ProjectUtil {
+
+  /**
+   * Checks whether the specified branch exists.
+   *
+   * @param repoManager Git repository manager to open the git repository
+   * @param branch the branch for which it should be checked if it exists
+   * @return {@code true} if the specified branch exists or if {@code HEAD} points to this branch,
+   *     otherwise {@code false}
+   * @throws RepositoryNotFoundException the repository of the branch's project does not exist.
+   * @throws IOException error while retrieving the branch from the repository.
+   */
+  public static boolean branchExists(final GitRepositoryManager repoManager, Branch.NameKey branch)
+      throws RepositoryNotFoundException, IOException {
+    try (Repository repo = repoManager.openRepository(branch.getParentKey())) {
+      boolean exists = repo.getRefDatabase().exactRef(branch.get()) != null;
+      if (!exists) {
+        exists =
+            repo.getFullBranch().equals(branch.get()) || RefNames.REFS_CONFIG.equals(branch.get());
+      }
+      return exists;
+    }
+  }
+}