Add TERM handling

This is useful to gracefully stop the Jenkins swarm process, for example when running in Kubernetes in conjunction with a preStop lifecycle hook. Signed-off-by: Gavin Williams <[email protected]>
jenkinsci · Oct 13, 2021 · 167e22a · 167e22a
1 parent 86fb969
commit 167e22a
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/client/src/main/java/hudson/plugins/swarm/Client.java b/client/src/main/java/hudson/plugins/swarm/Client.java
@@ -8,6 +8,8 @@
 import org.kohsuke.args4j.spi.FieldSetter;
 import org.kohsuke.args4j.spi.OptionHandler;
 
+import sun.misc.Signal;
+import sun.misc.SignalHandler;
 import oshi.SystemInfo;
 import oshi.software.os.OSProcess;
 
@@ -187,6 +189,14 @@ private static void validateOptions(Options options) {
      */
     static void run(SwarmClient swarmClient, Options options, String... args)
             throws InterruptedException {
+
+        Signal.handle(new Signal("TERM"), new SignalHandler() {
+            public void handle(Signal sig) {
+                logger.info("Exiting...");
+                swarmClient.exitWithStatus(0);
+            }
+        });
+
         logger.info("Connecting to Jenkins controller");
         URL url = swarmClient.getUrl();