Only set download/install-size attributes in features if they exist

tycho-core/src/main/java/org/eclipse/tycho/p2/resolver/WrappedArtifact.java

@@ -76,7 +76,7 @@ public String getWrappedVersion() {
 
     public String getReferenceHint() {
         return "The artifact can be referenced in feature files with the following data: <plugin id=\"" + wrappedBsn
-                + "\" version=\"" + wrappedVersion + "\" download-size=\"0\" install-size=\"0\" unpack=\"false\"/>";
+                + "\" version=\"" + wrappedVersion + "\"/>";
     }
 
     public String getGeneratedManifest() {

tycho-metadata-model/src/main/java/org/eclipse/tycho/model/PluginRef.java

@@ -85,6 +85,12 @@ public void setArch(String arch) {
         dom.setAttribute("arch", arch);
     }
 
+    @Deprecated
+    public boolean hasUnpack() {
+        String value = dom.getAttributeValue("unpack");
+        return value != null && !value.isBlank();
+    }
+
     /**
      * @deprecated The installation format (packed/unpacked) shall be specified through the bundle's
      *             Eclipse-BundleShape manifest header. The feature.xml's unpack attribute may not
@@ -105,6 +111,11 @@ public void setUnpack(boolean unpack) {
         dom.setAttribute("unpack", Boolean.toString(unpack));
     }
 
+    public boolean hasDownloadSize() {
+        String value = dom.getAttributeValue("download-size");
+        return value != null && !value.isBlank();
+    }
+
     public long getDownloadSize() {
         return Long.parseLong(dom.getAttributeValue("download-size"));
     }
@@ -113,6 +124,11 @@ public void setDownloadSize(long size) {
         dom.setAttribute("download-size", Long.toString(size));
     }
 
+    public boolean hasInstallSize() {
+        String value = dom.getAttributeValue("install-size");
+        return value != null && !value.isBlank();
+    }
+
     public long getInstallSize() {
         return Long.parseLong(dom.getAttributeValue("install-size"));
     }

tycho-packaging-plugin/src/main/java/org/eclipse/tycho/packaging/FeatureXmlTransformer.java

@@ -15,7 +15,6 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.util.Enumeration;
 import java.util.Map;
 import java.util.Objects;
 import java.util.function.BinaryOperator;
@@ -158,7 +157,9 @@ private static String quote(String nullableString) {
 	}
 
 	private void setDownloadAndInstallSize(PluginRef pluginRefToEdit, File artifact) {
-		// TODO 375111 optionally disable this?
+		if (!pluginRefToEdit.hasInstallSize() && !pluginRefToEdit.hasDownloadSize()) {
+			return;
+		}
 		long downloadSize = 0;
 		long installSize = 0;
 		if (artifact.isFile()) {
@@ -167,33 +168,23 @@ private void setDownloadAndInstallSize(PluginRef pluginRefToEdit, File artifact)
 		} else {
 			log.info("Download/install size is not calculated for directory based bundle " + pluginRefToEdit.getId());
 		}
-
-		pluginRefToEdit.setDownloadSize(downloadSize / KBYTE);
-		pluginRefToEdit.setInstallSize(installSize / KBYTE);
+		if (pluginRefToEdit.hasDownloadSize()) {
+			pluginRefToEdit.setDownloadSize(downloadSize / KBYTE);
+		}
+		if (pluginRefToEdit.hasInstallSize()) {
+			pluginRefToEdit.setInstallSize(installSize / KBYTE);
+		}
 	}
 
 	protected long getInstallSize(File location) {
-		long installSize = 0;
 		FileLocker locker = fileLockService.getFileLocker(location);
 		locker.lock();
-		try {
-			try {
-				try (JarFile jar = new JarFile(location)) {
-					Enumeration<JarEntry> entries = jar.entries();
-					while (entries.hasMoreElements()) {
-						JarEntry entry = entries.nextElement();
-						long entrySize = entry.getSize();
-						if (entrySize > 0) {
-							installSize += entrySize;
-						}
-					}
-				}
-			} catch (IOException e) {
-				throw new RuntimeException("Could not determine installation size of file " + location, e);
-			}
+		try (JarFile jar = new JarFile(location)) {
+			return jar.stream().mapToLong(JarEntry::getSize).filter(s -> s > 0).sum();
+		} catch (IOException e) {
+			throw new RuntimeException("Could not determine installation size of file " + location, e);
 		} finally {
 			locker.release();
 		}
-		return installSize;
 	}
 }

tycho-source-plugin/src/main/java/org/eclipse/tycho/source/SourceFeatureMojo.java

@@ -575,8 +575,9 @@ protected void addPlugin(Feature sourceFeature, P2ResolutionResult result, Plugi
         if (pluginRef.getArch() != null) {
             sourceRef.setArch(pluginRef.getArch());
         }
-        sourceRef.setUnpack(false);
-
+        if (pluginRef.hasUnpack()) {
+            sourceRef.setUnpack(false);
+        }
         sourceFeature.addPlugin(sourceRef);
     }