[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

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)",

org.eclipse.jgit.pgm/pom.xml

@@ -71,6 +71,11 @@
       <artifactId>args4j</artifactId>
     </dependency>
 
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-compress</artifactId>
+    </dependency>
+
     <dependency>
       <groupId>org.eclipse.jgit</groupId>
       <artifactId>org.eclipse.jgit</artifactId>

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( //

pom.xml

@@ -173,6 +173,7 @@
     <jsch-version>0.1.44-1</jsch-version>
     <junit-version>4.5</junit-version>
     <args4j-version>2.0.12</args4j-version>
+    <commons-compress-version>1.3</commons-compress-version>
     <servlet-api-version>2.5</servlet-api-version>
     <jetty-version>7.6.0.v20120127</jetty-version>
     <clirr-version>2.4</clirr-version>
@@ -415,6 +416,12 @@
         <version>${servlet-api-version}</version>
       </dependency>
 
+      <dependency>
+        <groupId>org.apache.commons</groupId>
+        <artifactId>commons-compress</artifactId>
+        <version>${commons-compress-version}</version>
+      </dependency>
+
       <dependency>
         <groupId>org.eclipse.jetty</groupId>
         <artifactId>jetty-servlet</artifactId>