From 9ae0ba0681ce5c64987d9d17d85a7f5306c5b245 Mon Sep 17 00:00:00 2001
From: Kohsuke Kawaguchi <kk@kohsuke.org>
Date: Thu, 30 Aug 2012 14:31:25 -0700
Subject: [PATCH] added a CLI command to obtain session ID

---
 .../java/hudson/cli/SessionIdCommand.java     | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 core/src/main/java/hudson/cli/SessionIdCommand.java

diff --git a/core/src/main/java/hudson/cli/SessionIdCommand.java b/core/src/main/java/hudson/cli/SessionIdCommand.java
new file mode 100644
index 0000000000..5a38f48922
--- /dev/null
+++ b/core/src/main/java/hudson/cli/SessionIdCommand.java
@@ -0,0 +1,24 @@
+package hudson.cli;
+
+import hudson.Extension;
+import jenkins.model.Jenkins;
+
+/**
+ * Prints the current session ID number (that changes for every run)
+ * to allow clients to reliably wait for a restart.
+ *
+ * @author Kohsuke Kawaguchi
+ */
+@Extension
+public class SessionIdCommand extends CLICommand {
+    @Override
+    public String getShortDescription() {
+        return "Outputs the session ID, which changes every time Jenkins restarts";
+    }
+
+    protected int run() {
+        stdout.println(Jenkins.SESSION_HASH);
+        return 0;
+    }
+}
+
-- 
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