ArchiveCommand: Create prefix entry with commit time

The cgit archive command creates a prefix (root) directory entry
in the archive file. That entry's time is set to the commit time.

This patch makes jgit's behavior consistent with with cgit:

prefix: hoge/     -> creates prefix directory "hoge/" entry.
prefix: hoge////  -> creates prefix directory "hoge/" entry.
prefix: hoge/foo  -> does not create prefix directory entry, but for
                     each file/directory entry, prefix is added.

Change-Id: I2610e40ce37972c5f7456fdca6337e7fb07176e5
Signed-off-by: Yasuhiro Takagi <ytakagi@bea.hi-ho.ne.jp>

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

@@ -348,7 +348,7 @@ public class ArchiveTest extends CLIRepositoryTestCase {
 		commitBazAndFooSlashBar();
 		byte[] result = CLIGitCommand.executeRaw(
 				"git archive --prefix=x/ --format=zip master", db).outBytes();
-		String[] expect = { "x/baz", "x/foo/", "x/foo/bar" };
+		String[] expect = { "x/", "x/baz", "x/foo/", "x/foo/bar" };
 		String[] actual = listZipEntries(result);
 
 		Arrays.sort(expect);
@@ -361,7 +361,7 @@ public class ArchiveTest extends CLIRepositoryTestCase {
 		commitBazAndFooSlashBar();
 		byte[] result = CLIGitCommand.executeRaw(
 				"git archive --prefix=x/ --format=tar master", db).outBytes();
-		String[] expect = { "x/baz", "x/foo/", "x/foo/bar" };
+		String[] expect = { "x/", "x/baz", "x/foo/", "x/foo/bar" };
 		String[] actual = listTarEntries(result);
 
 		Arrays.sort(expect);
@@ -380,7 +380,7 @@ public class ArchiveTest extends CLIRepositoryTestCase {
 		commitFoo();
 		byte[] result = CLIGitCommand.executeRaw(
 				"git archive --prefix=x// --format=zip master", db).outBytes();
-		String[] expect = { "x//foo" };
+		String[] expect = { "x/", "x//foo" };
 		assertArrayEquals(expect, listZipEntries(result));
 	}
 
@@ -389,7 +389,7 @@ public class ArchiveTest extends CLIRepositoryTestCase {
 		commitFoo();
 		byte[] result = CLIGitCommand.executeRaw(
 				"git archive --prefix=x// --format=tar master", db).outBytes();
-		String[] expect = { "x//foo" };
+		String[] expect = { "x/", "x//foo" };
 		assertArrayEquals(expect, listTarEntries(result));
 	}
 

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

@@ -403,6 +403,12 @@ public class ArchiveCommand extends GitCommand<OutputStream> {
 				if (!paths.isEmpty())
 					walk.setFilter(PathFilterGroup.createFromStrings(paths));
 
+				// Put base directory into archive
+				if (pfx.endsWith("/")) { //$NON-NLS-1$
+					fmt.putEntry(outa, tree, pfx.replaceAll("[/]+$", "/"), //$NON-NLS-1$ //$NON-NLS-2$
+							FileMode.TREE, null);
+				}
+
 				while (walk.next()) {
 					String name = pfx + walk.getPathString();
 					FileMode mode = walk.getFileMode(0);