GP-6754: Handle Jython not being installed better (message and headless

exit code)

Ghidra/Features/Base/src/main/java/ghidra/app/script/JythonStubScriptProvider.java

@@ -0,0 +1,64 @@
+/* ###
+ * IP: GHIDRA
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package ghidra.app.script;
+
+import java.io.PrintWriter;
+
+import generic.jar.ResourceFile;
+import ghidra.util.classfinder.ExtensionPointProperties;
+
+/**
+ * A stub {@link GhidraScriptProvider} used to give feedback to a user trying to run a Jython
+ * script when the Jython Extension is not installed.
+ * <p>
+ * Uses a sub-{@link ExtensionPointProperties#DEFAULT_PRIORITY default} priority so the Jython 
+ * Extension can get prioritized over this if it's installed.
+ */
+@ExtensionPointProperties(priority = ExtensionPointProperties.DEFAULT_PRIORITY - 1)
+public class JythonStubScriptProvider extends AbstractPythonScriptProvider {
+
+	@Override
+	public String getDescription() {
+		return "Jython";
+	}
+
+	@Override
+	public String getRuntimeEnvironmentName() {
+		return "Jython";
+	}
+
+	@Override
+	public GhidraScript getScriptInstance(ResourceFile sourceFile, PrintWriter writer)
+			throws JythonStubException {
+		throw new JythonStubException();
+	}
+
+	/**
+	 * A special type of {@link GhidraScriptLoadException} used to indicate that the Jython
+	 * Extension is not installed.
+	 */
+	public static class JythonStubException extends GhidraScriptLoadException {
+
+		/**
+		 * Construct an new {@link JythonStubException}
+		 */
+		public JythonStubException() {
+			super("Jython script failed. " +
+				"In order to use Jython based scripts, you must install the Jython Ghidra " +
+				"Extension, or (recommended) port your script to PyGhidra or Java.");
+		}
+	}
+}

Ghidra/Features/Base/src/main/java/ghidra/app/util/headless/HeadlessAnalyzer.java

@@ -30,6 +30,7 @@ import ghidra.GhidraJarApplicationLayout;
 import ghidra.app.plugin.core.analysis.AutoAnalysisManager;
 import ghidra.app.plugin.core.osgi.BundleHost;
 import ghidra.app.script.*;
+import ghidra.app.script.JythonStubScriptProvider.JythonStubException;
 import ghidra.app.util.headless.HeadlessScript.HeadlessContinuationOption;
 import ghidra.app.util.importer.ProgramLoader;
 import ghidra.app.util.opinion.*;
@@ -960,7 +961,13 @@ public class HeadlessAnalyzer {
 		}
 		catch (Exception exc) {
 			String logErrorMsg = "REPORT SCRIPT ERROR: " + scriptName + " : " + exc.getMessage();
-			Msg.error(this, logErrorMsg, exc);
+			if (exc instanceof JythonStubException) {
+				Msg.error(this, logErrorMsg);
+				System.exit(1);
+			}
+			else {
+				Msg.error(this, logErrorMsg, exc);
+			}
 		}
 
 		return retOption;