Skip nested copyfiles in RepoCommand.

Similar to nested directories, nested copyfiles won't work with git submodule
either.

Change-Id: Idbe965ec20a682fca0432802858162f8238f05de
Signed-off-by: Yuxuan 'fishy' Wang <fishywang@google.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/gitrepo/RepoCommandTest.java

@@ -409,6 +409,7 @@ public void testCopyFileBare() throws Exception {
 					.append("<project path=\"foo\" name=\"").append(defaultUri)
 					.append("\" revision=\"").append(BRANCH).append("\" >")
 					.append("<copyfile src=\"hello.txt\" dest=\"Hello\" />")
+					.append("<copyfile src=\"hello.txt\" dest=\"foo/Hello\" />")
 					.append("</project>").append("</manifest>");
 			JGitTestUtil.writeTrashFile(tempDb, "manifest.xml",
 					xmlContent.toString());
@@ -423,8 +424,12 @@ public void testCopyFileBare() throws Exception {
 					.getRepository();
 			// The Hello file should exist
 			File hello = new File(localDb.getWorkTree(), "Hello");
-			localDb.close();
 			assertTrue("The Hello file should exist", hello.exists());
+			// The foo/Hello file should be skipped.
+			File foohello = new File(localDb.getWorkTree(), "foo/Hello");
+			assertFalse(
+					"The foo/Hello file should be skipped", foohello.exists());
+			localDb.close();
 			// The content of Hello file should be expected
 			BufferedReader reader = new BufferedReader(new FileReader(hello));
 			String content = reader.readLine();

org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java

@@ -338,6 +338,20 @@ void removeOverlaps() {
 			else
 				last = p;
 		}
+		removeNestedCopyfiles();
+	}
+
+	/** Remove copyfiles that sit in a subdirectory of any other project. */
+	void removeNestedCopyfiles() {
+		for (RepoProject proj : filteredProjects) {
+			List<CopyFile> copyfiles = new ArrayList<>(proj.getCopyFiles());
+			proj.clearCopyFiles();
+			for (CopyFile copyfile : copyfiles) {
+				if (!isNestedCopyfile(copyfile)) {
+					proj.addCopyFile(copyfile);
+				}
+			}
+		}
 	}
 
 	boolean inGroups(RepoProject proj) {
@@ -357,4 +371,22 @@ boolean inGroups(RepoProject proj) {
 		}
 		return false;
 	}
+
+	private boolean isNestedCopyfile(CopyFile copyfile) {
+		if (copyfile.dest.indexOf('/') == -1) {
+			// If the copyfile is at root level then it won't be nested.
+			return false;
+		}
+		for (RepoProject proj : filteredProjects) {
+			if (proj.getPath().compareTo(copyfile.dest) > 0) {
+				// Early return as remaining projects can't be ancestor of this
+				// copyfile config (filteredProjects is sorted).
+				return false;
+			}
+			if (proj.isAncestorOf(copyfile.dest)) {
+				return true;
+			}
+		}
+		return false;
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoProject.java

@@ -258,6 +258,15 @@ public void addCopyFiles(Collection<CopyFile> copyfiles) {
 		this.copyfiles.addAll(copyfiles);
 	}
 
+	/**
+	 * Clear all the copyfiles.
+	 *
+	 * @since 4.2
+	 */
+	public void clearCopyFiles() {
+		this.copyfiles.clear();
+	}
+
 	private String getPathWithSlash() {
 		if (path.endsWith("/")) //$NON-NLS-1$
 			return path;
@@ -273,7 +282,19 @@ private String getPathWithSlash() {
 	 * @return true if this sub repo is the ancestor of given sub repo.
 	 */
 	public boolean isAncestorOf(RepoProject that) {
-		return that.getPathWithSlash().startsWith(this.getPathWithSlash());
+		return isAncestorOf(that.getPathWithSlash());
+	}
+
+	/**
+	 * Check if this sub repo is an ancestor of the given path.
+	 *
+	 * @param path
+	 *            path to be checked to see if it is within this repository
+	 * @return true if this sub repo is an ancestor of the given path.
+	 * @since 4.2
+	 */
+	public boolean isAncestorOf(String path) {
+		return path.startsWith(getPathWithSlash());
 	}
 
 	@Override