Add long filename, large file, and non-ASCII filename support to TarFormat

Attempts to write entries with too-long filenames currently error out:

  $ jgit.pgm/target/jgit archive HEAD >test.tar
  java.lang.RuntimeException: file name 'org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/resolver/DefaultReceivePackFactory.java' is too long ( > 100 bytes)
          at org.apache.commons.compress.archivers.tar.TarArchiveOutputStream.putArchiveEntry(TarArchiveOutputStream.java:288)
          at org.eclipse.jgit.archive.TarFormat.putEntry(TarFormat.java:92)
          at org.eclipse.jgit.archive.TarFormat.putEntry(TarFormat.java:62)
          at org.eclipse.jgit.api.ArchiveCommand.writeArchive(ArchiveCommand.java:293)
          at org.eclipse.jgit.api.ArchiveCommand.call(ArchiveCommand.java:322)
          at org.eclipse.jgit.pgm.Archive.run(Archive.java:97)
          at org.eclipse.jgit.pgm.TextBuiltin.execute(TextBuiltin.java:174)
          at org.eclipse.jgit.pgm.Main.execute(Main.java:213)
          at org.eclipse.jgit.pgm.Main.run(Main.java:121)
          at org.eclipse.jgit.pgm.Main.main(Main.java:95)

That's because the default longFileMode is LONGFILE_ERROR, which
throws an exception for filenames longer than 100 characters.  Switch
to LONGFILE_POSIX.  While at it, handle large files and filenames with
strange encodings, too.

This requires commons compress 1.4, which introduced support for large
files and POSIX long filenames.

Change-Id: I04d5427eec0968b129f55d7a4c6021039a494828

org.eclipse.jgit.archive/META-INF/MANIFEST.MF

@@ -6,12 +6,12 @@ Bundle-Version: 3.0.0.qualifier
 Bundle-Vendor: %provider_name
 Bundle-Localization: plugin
 Bundle-RequiredExecutionEnvironment: J2SE-1.5
-Import-Package: org.apache.commons.compress.archivers;version="[1.3,2.0)",
- org.apache.commons.compress.archivers.tar;version="[1.3,2.0)",
- org.apache.commons.compress.archivers.zip;version="[1.3,2.0)",
- org.apache.commons.compress.compressors.bzip2;version="[1.3,2.0)",
- org.apache.commons.compress.compressors.gzip;version="[1.3,2.0)",
- org.apache.commons.compress.compressors.xz;version="[1.3,2.0)",
+Import-Package: org.apache.commons.compress.archivers;version="[1.4,2.0)",
+ org.apache.commons.compress.archivers.tar;version="[1.4,2.0)",
+ org.apache.commons.compress.archivers.zip;version="[1.4,2.0)",
+ org.apache.commons.compress.compressors.bzip2;version="[1.4,2.0)",
+ org.apache.commons.compress.compressors.gzip;version="[1.4,2.0)",
+ org.apache.commons.compress.compressors.xz;version="[1.4,2.0)",
  org.eclipse.jgit.api;version="[3.0.0,3.1.0)",
  org.eclipse.jgit.lib;version="[3.0.0,3.1.0)",
  org.osgi.framework;version="[1.3.0,2.0.0)"

org.eclipse.jgit.archive/src/org/eclipse/jgit/archive/TarFormat.java

@@ -54,11 +54,14 @@ import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.lib.ObjectLoader;
 
 /**
- * Unix TAR format (ustar + old GNU long filename extension).
+ * Unix TAR format (ustar + some PAX extensions).
  */
 public class TarFormat implements ArchiveCommand.Format<ArchiveOutputStream> {
 	public ArchiveOutputStream createArchiveOutputStream(OutputStream s) {
-		return new TarArchiveOutputStream(s);
+		TarArchiveOutputStream out = new TarArchiveOutputStream(s, "UTF-8"); //$NON-NLS-1$
+		out.setLongFileMode(TarArchiveOutputStream.LONGFILE_POSIX);
+		out.setBigNumberMode(TarArchiveOutputStream.BIGNUMBER_POSIX);
+		return out;
 	}
 
 	public void putEntry(ArchiveOutputStream out,

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

@@ -228,6 +228,36 @@ public class ArchiveTest extends CLIRepositoryTestCase {
 		assertTarContainsEntry("with-modes.tar", "l", "symlink -> plain");
 	}
 
+	@Test
+	public void testArchiveWithLongFilename() throws Exception {
+		String filename = "1234567890";
+		for (int i = 0; i < 20; i++)
+			filename = filename + "/1234567890";
+		writeTrashFile(filename, "file with long path");
+		git.add().addFilepattern("1234567890").call();
+		git.commit().setMessage("file with long name").call();
+
+		final byte[] result = CLIGitCommand.rawExecute( //
+				"git archive HEAD", db);
+		assertArrayEquals(new String[] { filename },
+				listZipEntries(result));
+	}
+
+	@Test
+	public void testTarWithLongFilename() throws Exception {
+		String filename = "1234567890";
+		for (int i = 0; i < 20; i++)
+			filename = filename + "/1234567890";
+		writeTrashFile(filename, "file with long path");
+		git.add().addFilepattern("1234567890").call();
+		git.commit().setMessage("file with long name").call();
+
+		final byte[] result = CLIGitCommand.rawExecute( //
+				"git archive --format=tar HEAD", db);
+		assertArrayEquals(new String[] { filename },
+				listTarEntries(result));
+	}
+
 	@Test
 	public void testArchivePreservesContent() throws Exception {
 		final String payload = "“The quick brown fox jumps over the lazy dog!”";