added post command example

examples/lpostcmd.lua

@@ -0,0 +1,80 @@
+-----
+-- User configuration file for lsyncd.
+--
+-- This configuration will execute a command on the remote host
+-- after every successfullycompleted rsync operation.
+-- for example to restart servlets on the target host or so.
+
+local rsyncpostcmd = {
+
+	-- based on default rsync.
+	default.rsync,
+
+    -- for this config it is important to keep maxProcesses at 1, so
+    -- the postcmds will only be spawned after the rsync completed
+	maxProcesses = 1,
+
+	-- called whenever something is to be done
+	action = function(inlet)
+		local event = inlet.getEvent()
+		-- if the event is a blanket event and not the startup,
+		-- its there to spawn the webservice restart at the target.
+		if event.etype == "Blanket" then
+			-- uses rawget to test if "isRestart" has been set without
+			-- triggering an error if not.
+			local isRestart = rawget(event, "isRestart")
+			if event.isRestart then
+				spawn(event, "/usr/bin/ssh", host, postcmd)
+        		return
+			else
+            	-- this is the startup, forwards it to default routine.
+            	return default.rsync.action(inlet) 
+        	end
+			error("this should never be reached")
+		end
+     	-- for any other event, an blanket event is created that
+		-- will stack on the queue and do the postcmd when its finished
+		local sync = inlet.createBlanketEvent()
+		sync.isRestart = true
+		-- the original event if forward to the normal action handler
+		return default.rsync.action(inlet)
+	end,
+
+	collect = function(agent, exitcode)
+		-- for the restart ssh commands 255 is network error -> try again
+		local isRestart = rawget(agent, "isRestart")
+		if not agent.isList and agent.etype == "Blanket" and isRestart then
+			if exitcode == 255 then
+				return "again"
+			end
+			return
+		else
+			--- everything else, forward to default collection handler
+			return default.collect(agent,exitcode)
+		end
+		error("this should never be reached")
+	end
+
+	prepare = function(config)
+		if not config.host then
+			error("rsyncpostcmd neets 'host' configured", 4)
+		end
+		if not config.targetdir then
+			error("rsyncpostcmd needs 'targetdir' configured", 4)
+		end
+		if not config.target then
+			config.target = config.host .. ":" .. config.targetdir
+		end
+		return default.rsync.prepare(config)
+	end
+}
+
+
+sync {
+	rsyncpostcmd, 
+	source = "src",
+	host = "beetle",
+	targetdir = "/path/to/trg",
+	postcmd = "/usr/local/bin/restart-servelt.sh",
+}
+