[pgm] Add --mirror option to clone command

Bug: 552173
Change-Id: Ic8a98b2e0f8f29afd599723f93e51b06b9f13314
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.pgm.test/tst/org/eclipse/jgit/pgm/CloneTest.java

 
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 
 import java.io.File;
 import org.eclipse.jgit.junit.MockSystemReader;
 import org.eclipse.jgit.lib.CLIRepositoryTestCase;
 import org.eclipse.jgit.lib.Constants;
+import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.lib.RefUpdate;
+import org.eclipse.jgit.lib.StoredConfig;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.eclipse.jgit.transport.RefSpec;
+import org.eclipse.jgit.transport.RemoteConfig;
 import org.eclipse.jgit.transport.URIish;
 import org.eclipse.jgit.util.SystemReader;
 import org.junit.Before;
 		assertEquals("expected 1 branch", 1, branches.size());
 	}
 
-	private void createInitialCommit() throws Exception {
+	private RevCommit createInitialCommit() throws Exception {
 		JGitTestUtil.writeTrashFile(db, "hello.txt", "world");
 		git.add().addFilepattern("hello.txt").call();
-		git.commit().setMessage("Initial commit").call();
+		return git.commit().setMessage("Initial commit").call();
 	}
 
 	@Test
 		assertEquals("expected 1 branch", 1, branches.size());
 		assertTrue("expected bare repository", git2.getRepository().isBare());
 	}
+
+	@Test
+	public void testCloneMirror() throws Exception {
+		ObjectId head = createInitialCommit();
+		// create a non-standard ref
+		RefUpdate ru = db.updateRef("refs/meta/foo/bar");
+		ru.setNewObjectId(head);
+		ru.update();
+
+		File gitDir = db.getDirectory();
+		String sourcePath = gitDir.getAbsolutePath();
+		String targetPath = (new File(sourcePath)).getParentFile()
+				.getParentFile().getAbsolutePath() + File.separator
+				+ "target.git";
+		String cmd = "git clone --mirror " + shellQuote(sourcePath) + " "
+				+ shellQuote(targetPath);
+		String[] result = execute(cmd);
+		assertArrayEquals(
+				new String[] { "Cloning into '" + targetPath + "'...", "", "" },
+				result);
+		Git git2 = Git.open(new File(targetPath));
+		List<Ref> branches = git2.branchList().call();
+		assertEquals("expected 1 branch", 1, branches.size());
+		assertTrue("expected bare repository", git2.getRepository().isBare());
+		StoredConfig config = git2.getRepository().getConfig();
+		RemoteConfig rc = new RemoteConfig(config, "origin");
+		assertTrue("expected mirror configuration", rc.isMirror());
+		RefSpec fetchRefSpec = rc.getFetchRefSpecs().get(0);
+		assertTrue("exected force udpate", fetchRefSpec.isForceUpdate());
+		assertEquals("refs/*", fetchRefSpec.getSource());
+		assertEquals("refs/*", fetchRefSpec.getDestination());
+		assertNotNull(git2.getRepository().exactRef("refs/meta/foo/bar"));
+	}
 }

org.eclipse.jgit.pgm/resources/org/eclipse/jgit/pgm/internal/CLIText.properties

 usage_Aggressive=This option will cause gc to more aggressively optimize the repository at the expense of taking much more time
 usage_AlwaysFallback=Show uniquely abbreviated commit object as fallback
 usage_bareClone=Make a bare Git repository. That is, instead of creating [DIRECTORY] and placing the administrative files in [DIRECTORY]/.git, make the [DIRECTORY] itself the $GIT_DIR.
+usage_mirrorClone=Set up a mirror of the source repository. This implies --bare. Compared to --bare, --mirror not only maps \
+local branches of the source to local branches of the target, it maps all refs (including remote-tracking branches, notes etc.) \
+and sets up a refspec configuration such that all these refs are overwritten by a git remote update in the target repository.
 usage_Blame=Show what revision and author last modified each line
 usage_Clean=Remove untracked files from the working tree
 usage_CommandLineClientForamazonsS3Service=Command line client for Amazon's S3 service

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Clone.java

 	@Option(name = "--bare", usage = "usage_bareClone")
 	private boolean isBare;
 
+	@Option(name = "--mirror", usage = "usage_mirrorClone")
+	private boolean isMirror;
+
 	@Option(name = "--quiet", usage = "usage_quiet")
 	private Boolean quiet;
 
 		if (localName == null) {
 			try {
 				localName = uri.getHumanishName();
-				if (isBare) {
+				if (isBare || isMirror) {
 					localName = localName + Constants.DOT_GIT_EXT;
 				}
 				localNameF = new File(SystemReader.getInstance().getProperty(
 
 		CloneCommand command = Git.cloneRepository();
 		command.setURI(sourceUri).setRemote(remoteName).setBare(isBare)
+				.setMirror(isMirror)
 				.setNoCheckout(noCheckout).setBranch(branch)
 				.setCloneSubmodules(cloneSubmodules);