[RFC] archive: Switch to commons-compress as ZIP archiver

The Apache Commons Compress library provides a similar interface to
java.util.zip with some features not found in java.util.zip, including
support for inclusion of metadata (file mode and symlink targets) and
support for multiple file formats (zip, .tar.xz, etc).

Use it, in preparation for making use of these features.  No
functional change intended yet.

A previous version of this patch used plexus-archiver.  That is a
heavier-weight dependency and offers a less convenient interface.

Thanks to James Moger and Chris Aniszczyk for advice.

Change-Id: Id01146950bb9c18dae0169311e3cde2c3bfa675e

3 files changed, 13 insertions, 6 deletions

diff --git a/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF b/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF
index df026e02cb..57b59afbc0 100644
--- a/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.pgm/META-INF/MANIFEST.MF
@@ -6,7 +6,8 @@ Bundle-Version: 2.2.0.qualifier
 Bundle-Vendor: %provider_name
 Bundle-Localization: plugin
 Bundle-RequiredExecutionEnvironment: J2SE-1.5
-Import-Package: org.eclipse.jgit.api;version="[2.2.0,2.3.0)",
+Import-Package: org.apache.commons.compress.archivers.zip;version="[1.3,2.0)",
+ org.eclipse.jgit.api;version="[2.2.0,2.3.0)",
  org.eclipse.jgit.api.errors;version="[2.2.0,2.3.0)",
  org.eclipse.jgit.awtui;version="[2.2.0,2.3.0)",
  org.eclipse.jgit.blame;version="[2.2.0,2.3.0)",
diff --git a/org.eclipse.jgit.pgm/pom.xml b/org.eclipse.jgit.pgm/pom.xml
index 02d346365a..5cf108420d 100644
--- a/org.eclipse.jgit.pgm/pom.xml
+++ b/org.eclipse.jgit.pgm/pom.xml
@@ -72,6 +72,11 @@
     </dependency>
 
     <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-compress</artifactId>
+    </dependency>
+
+    <dependency>
       <groupId>org.eclipse.jgit</groupId>
       <artifactId>org.eclipse.jgit</artifactId>
       <version>${project.version}</version>
diff --git a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Archive.java b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Archive.java
index 786524eca2..ec937a3cc3 100644
--- a/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Archive.java
+++ b/org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Archive.java
@@ -46,9 +46,9 @@ package org.eclipse.jgit.pgm;
 import java.lang.String;
 import java.lang.System;
 import java.text.MessageFormat;
-import java.util.zip.ZipEntry;
-import java.util.zip.ZipOutputStream;
 
+import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
+import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
 import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.lib.MutableObjectId;
 import org.eclipse.jgit.lib.ObjectLoader;
@@ -69,7 +69,7 @@ class Archive extends TextBuiltin {
 		final TreeWalk walk = new TreeWalk(db);
 		final ObjectReader reader = walk.getObjectReader();
 		final MutableObjectId idBuf = new MutableObjectId();
-		final ZipOutputStream out = new ZipOutputStream(outs);
+		final ZipArchiveOutputStream out = new ZipArchiveOutputStream(outs);
 
 		if (tree == null)
 			throw die(CLIText.get().treeIsRequired);
@@ -87,11 +87,12 @@ class Archive extends TextBuiltin {
 				continue;
 
 			walk.getObjectId(idBuf, 0);
-			final ZipEntry entry = new ZipEntry(name);
+			final ZipArchiveEntry entry = new ZipArchiveEntry(name);
 			final ObjectLoader loader = reader.open(idBuf);
 			entry.setSize(loader.getSize());
-			out.putNextEntry(entry);
+			out.putArchiveEntry(entry);
 			loader.copyTo(out);
+			out.closeArchiveEntry();
 
 			if (mode != FileMode.REGULAR_FILE)
 				System.err.println(MessageFormat.format( //