Handle bundle folders in VirtualArtifactRepository.transferArtifact

The implementation currently assumes all bundles are jars, but bundles
from the shared bundle pool may be unpacked as folders.

eclipse-pde#962

ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/target/VirtualArtifactRepository.java

@@ -14,6 +14,7 @@
 package org.eclipse.pde.internal.core.target;
 
 import java.io.File;
+import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -34,6 +35,7 @@
 import org.eclipse.core.runtime.Status;
 import org.eclipse.core.runtime.SubMonitor;
 import org.eclipse.equinox.frameworkadmin.BundleInfo;
+import org.eclipse.equinox.internal.p2.core.helpers.FileUtils;
 import org.eclipse.equinox.internal.p2.metadata.expression.QueryResult;
 import org.eclipse.equinox.p2.core.IProvisioningAgent;
 import org.eclipse.equinox.p2.core.ProvisionException;
@@ -123,8 +125,25 @@ private void transferArtifact(Object artifactModel, OutputStream destination) th
 			if (location == null) {
 				throw new FileNotFoundException(bundleInfo.getSymbolicName());
 			}
-			try (InputStream is = location.toURL().openStream()) {
-				is.transferTo(destination);
+
+			File bundleLocation = new File(location);
+			if (bundleLocation.isFile()) {
+				try (InputStream is = new FileInputStream(bundleLocation)) {
+					is.transferTo(destination);
+				}
+			} else {
+				File zipFile = null;
+				try {
+					zipFile = File.createTempFile(bundleLocation.getName(), ".jar", null); //$NON-NLS-1$
+					FileUtils.zip(bundleLocation.listFiles(), null, zipFile,
+							FileUtils.createRootPathComputer(bundleLocation));
+					FileInputStream fis = new FileInputStream(zipFile);
+					FileUtils.copyStream(fis, true, destination, false);
+				} finally {
+					if (zipFile != null) {
+						zipFile.delete();
+					}
+				}
 			}
 		} else if (artifactModel instanceof IFeatureModel featureModel) {
 			String installLocation = featureModel.getInstallLocation();