Recurse into cloned submodules

Iterate over all successfully cloned submodules recursively
and continue initializing and updating until no more are found.

Bug: 375426
Change-Id: Ifb99e41e2deb0c369442bca3c0f5f072dd006816

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/CloneCommandTest.java

@@ -69,6 +69,7 @@ import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.storage.file.FileBasedConfig;
 import org.eclipse.jgit.submodule.SubmoduleStatus;
 import org.eclipse.jgit.submodule.SubmoduleStatusType;
+import org.eclipse.jgit.submodule.SubmoduleWalk;
 import org.eclipse.jgit.util.SystemReader;
 import org.junit.Test;
 
@@ -303,6 +304,92 @@ public class CloneCommandTest extends RepositoryTestCase {
 		assertEquals(commit, pathStatus.getIndexId());
 	}
 
+	@Test
+	public void testCloneRepositoryWithNestedSubmodules() throws Exception {
+		git.checkout().setName(Constants.MASTER).call();
+
+		// Create submodule 1
+		File submodule1 = createTempDirectory("testCloneRepositoryWithNestedSubmodules1");
+		Git sub1Git = Git.init().setDirectory(submodule1).call();
+		assertNotNull(sub1Git);
+		Repository sub1 = sub1Git.getRepository();
+		assertNotNull(sub1);
+		addRepoToClose(sub1);
+
+		String file = "file.txt";
+		String path = "sub";
+
+		write(new File(sub1.getWorkTree(), file), "content");
+		sub1Git.add().addFilepattern(file).call();
+		RevCommit commit = sub1Git.commit().setMessage("create file").call();
+		assertNotNull(commit);
+
+		// Create submodule 2
+		File submodule2 = createTempDirectory("testCloneRepositoryWithNestedSubmodules2");
+		Git sub2Git = Git.init().setDirectory(submodule2).call();
+		assertNotNull(sub2Git);
+		Repository sub2 = sub2Git.getRepository();
+		assertNotNull(sub2);
+		addRepoToClose(sub2);
+
+		write(new File(sub2.getWorkTree(), file), "content");
+		sub2Git.add().addFilepattern(file).call();
+		RevCommit sub2Head = sub2Git.commit().setMessage("create file").call();
+		assertNotNull(sub2Head);
+
+		// Add submodule 2 to submodule 1
+		assertNotNull(sub1Git.submoduleAdd().setPath(path)
+				.setURI(sub2.getDirectory().toURI().toString()).call());
+		RevCommit sub1Head = sub1Git.commit().setAll(true)
+				.setMessage("Adding submodule").call();
+		assertNotNull(sub1Head);
+
+		// Add submodule 1 to default repository
+		assertNotNull(git.submoduleAdd().setPath(path)
+				.setURI(sub1.getDirectory().toURI().toString()).call());
+		assertNotNull(git.commit().setAll(true).setMessage("Adding submodule")
+				.call());
+
+		// Clone default repository and include submodules
+		File directory = createTempDirectory("testCloneRepositoryWithNestedSubmodules");
+		CloneCommand clone = Git.cloneRepository();
+		clone.setDirectory(directory);
+		clone.setCloneSubmodules(true);
+		clone.setURI(git.getRepository().getDirectory().toURI().toString());
+		Git git2 = clone.call();
+		addRepoToClose(git2.getRepository());
+		assertNotNull(git2);
+
+		assertEquals(Constants.MASTER, git2.getRepository().getBranch());
+		assertTrue(new File(git2.getRepository().getWorkTree(), path
+				+ File.separatorChar + file).exists());
+		assertTrue(new File(git2.getRepository().getWorkTree(), path
+				+ File.separatorChar + path + File.separatorChar + file)
+				.exists());
+
+		SubmoduleStatusCommand status = new SubmoduleStatusCommand(
+				git2.getRepository());
+		Map<String, SubmoduleStatus> statuses = status.call();
+		SubmoduleStatus pathStatus = statuses.get(path);
+		assertNotNull(pathStatus);
+		assertEquals(SubmoduleStatusType.INITIALIZED, pathStatus.getType());
+		assertEquals(sub1Head, pathStatus.getHeadId());
+		assertEquals(sub1Head, pathStatus.getIndexId());
+
+		SubmoduleWalk walk = SubmoduleWalk.forIndex(git2.getRepository());
+		assertTrue(walk.next());
+		Repository clonedSub1 = walk.getRepository();
+		assertNotNull(clonedSub1);
+		status = new SubmoduleStatusCommand(clonedSub1);
+		statuses = status.call();
+		pathStatus = statuses.get(path);
+		assertNotNull(pathStatus);
+		assertEquals(SubmoduleStatusType.INITIALIZED, pathStatus.getType());
+		assertEquals(sub2Head, pathStatus.getHeadId());
+		assertEquals(sub2Head, pathStatus.getIndexId());
+		assertFalse(walk.next());
+	}
+
 	@Test
 	public void testCloneWithAutoSetupRebase() throws Exception {
 		File directory = createTempDirectory("testCloneRepository1");

org.eclipse.jgit/src/org/eclipse/jgit/api/CloneCommand.java

@@ -66,6 +66,7 @@ import org.eclipse.jgit.lib.RefUpdate;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevWalk;
+import org.eclipse.jgit.submodule.SubmoduleWalk;
 import org.eclipse.jgit.transport.FetchResult;
 import org.eclipse.jgit.transport.RefSpec;
 import org.eclipse.jgit.transport.RemoteConfig;
@@ -229,7 +230,7 @@ public class CloneCommand extends TransportCommand<CloneCommand, Git> {
 		}
 	}
 
-	private void cloneSubmodules(Repository clonedRepo) {
+	private void cloneSubmodules(Repository clonedRepo) throws IOException {
 		SubmoduleInitCommand init = new SubmoduleInitCommand(clonedRepo);
 		if (init.call().isEmpty())
 			return;
@@ -237,7 +238,14 @@ public class CloneCommand extends TransportCommand<CloneCommand, Git> {
 		SubmoduleUpdateCommand update = new SubmoduleUpdateCommand(clonedRepo);
 		configure(update);
 		update.setProgressMonitor(monitor);
-		update.call();
+		if (!update.call().isEmpty()) {
+			SubmoduleWalk walk = SubmoduleWalk.forIndex(clonedRepo);
+			while (walk.next()) {
+				Repository subRepo = walk.getRepository();
+				if (subRepo != null)
+					cloneSubmodules(subRepo);
+			}
+		}
 	}
 
 	private Ref findBranchToCheckout(FetchResult result) {