JBDS-3929 apply the same artifacts.xml transformations in artifacts.j…

…ar as in artifacts.xml.xz

tycho-plugins/repository-utils/src/main/java/org/jboss/tools/tycho/sitegenerator/GenerateRepositoryFacadeMojo.java

@@ -604,6 +604,30 @@ private void addP2Stats(File p2repository) throws FileNotFoundException, IOExcep
 		contentStream.close();
 		outContentStream.closeEntry();
 		outContentStream.close();
+
+		// JBDS-3929 overwrite the artifacts.xml.xz file too
+		// see also https://bugs.eclipse.org/bugs/show_bug.cgi?id=464614
+		//getLog().debug("delete old artifacts.xml.xz");
+		FileUtils.forceDelete(new File(p2repository,"artifacts.xml.xz"));
+		//getLog().debug("create artifacts.xml from transformed XML");
+		File artifactsXML = new File(p2repository, "artifacts.xml");
+		FileOutputStream outartifactsStreamXML = new FileOutputStream(artifactsXML);
+		StreamResult resultXML = new StreamResult(outartifactsStreamXML);
+		transformer.transform(source, resultXML);
+		outartifactsStreamXML.close();
+		//getLog().debug("stream artifacts.xml to artifacts.xml.xz");
+		BufferedInputStream in = new BufferedInputStream(new FileInputStream(artifactsXML));
+		XZCompressorOutputStream out = new XZCompressorOutputStream(new FileOutputStream(new File(p2repository,"artifacts.xml.xz")));
+		final byte[] buffer = new byte[1024];
+		int n = 0;
+		while (-1 != (n = in.read(buffer))) {
+		    out.write(buffer, 0, n);
+		}
+		out.close();
+		in.close();
+		//getLog().debug("new artifacts.xml.xz written; remove artifacts.xml");
+		FileUtils.forceDelete(new File(p2repository,"artifacts.xml"));
+
 	}
 
 	private void alterIndexFile(File outputSite) throws FileNotFoundException, IOException {