Allow exposing HTTP and Agent connection ports via --httpPort and `…

…--agentPort` options

README.adoc

@@ -161,6 +161,11 @@ Advanced arguments:
   Also, plugin https://javadoc.jenkins.io/hudson/init/Terminator.html[@Terminator] extensions will not be invoked.
   It may lead to undefined behavior in the system, including potential data loss.
   This option is considered safe for the Vanilla package with the default plugin set.
+* `--httpPort` - Port for exposing the web server and Jenkins Web UI from Jenkinsfile Runner.
+  Disabled by default.
+* `--agentPort` - Port for connecting inbound Jenkins agents (over JNLP or WebSockets).
+  Disabled by default.
+
 
 ==== Running Jenkinsfiles (`run` command)
 

bootstrap/src/main/java/io/jenkins/jenkinsfile/runner/bootstrap/commands/JenkinsLauncherOptions.java

@@ -1,6 +1,7 @@
 package io.jenkins.jenkinsfile.runner.bootstrap.commands;
 
 import edu.umd.cs.findbugs.annotations.CheckForNull;
+import edu.umd.cs.findbugs.annotations.NonNull;
 import picocli.CommandLine;
 
 import java.io.File;
@@ -62,7 +63,16 @@ public class JenkinsLauncherOptions {
             description = "When a slim packaging is used, points to the library directory which contains payload.jar and setup.jar files")
     public File libPath;
 
+    @CheckForNull
+    @CommandLine.Option(names = "--httpPort",
+            description = "Port for exposing the web server and Jenkins Web UI from Jenkinsfile Runner. Disabled by default")
+    public Integer httpPort;
 
+    @CheckForNull
+    @CommandLine.Option(names = "--agentPort",
+            description = "Port for connecting inbound Jenkins agents (over JNLP or WebSockets). Disabled by default")
+    public Integer agentPort;
+
     public String getMirrorURL(String url) {
         if (this.mirror == null || "".equals(this.mirror.trim())) {
             return url;

setup/src/main/java/io/jenkins/jenkinsfile/runner/JenkinsLauncher.java

@@ -56,6 +56,12 @@ protected Jenkins newJenkins() throws Exception {
         final Jenkins j = super.newJenkins();
         // Notify the bootstrap about the plugin classloader to be used in its logic
      //   command.setPluginClassloader(j.getPluginManager().uberClassLoader);
+
+        // Configure the agent endpoint
+        if (command.launcherOptions.agentPort != null) {
+            j.setSlaveAgentPort(command.launcherOptions.agentPort);
+        }
+
         return j;
     }
 
@@ -67,7 +73,9 @@ protected ServletContext createWebServer() throws Exception {
         final JenkinsLauncherOptions launcherOptions = command.getLauncherOptions();
 
         QueuedThreadPool queuedThreadPool = new QueuedThreadPool(10);
-        server = new Server(queuedThreadPool);
+        server = launcherOptions.httpPort != null
+                ? new Server(launcherOptions.httpPort)
+                : new Server(queuedThreadPool);
 
         WebAppContext context = new WebAppContext(launcherOptions.warDir.getPath(), contextPath);
         context.setClassLoader(getClass().getClassLoader());
@@ -84,7 +92,7 @@ protected ServletContext createWebServer() throws Exception {
 
         server.start();
 
-        localPort = -1;
+        localPort = launcherOptions.httpPort != null ? launcherOptions.httpPort : -1;
 
         String pluginManagerClass = SystemProperties.getString(PluginManager.CUSTOM_PLUGIN_MANAGER);
         if (pluginManagerClass == null) {