Ensure that the pidfile is written after all logic for Barak is

complete.

cmd/barak/main.go

@@ -88,12 +88,6 @@ func main() {
 	}
 	barak.registries = options.Registries
 
-	// Write pid to file.
-	err = AtomicWriteFile(barak.rootDir+"/pidfile", []byte(Fmt("%v", barak.pid)))
-	if err != nil {
-		panic(Fmt("Error writing pidfile: %v", err))
-	}
-
 	// Debug.
 	fmt.Printf("Options: %v\n", options)
 	fmt.Printf("Barak: %v\n", barak)
@@ -119,6 +113,12 @@ func main() {
 		}(registry)
 	}
 
+	// Write pid to file.  This should be the last thing before TrapSignal.
+	err = AtomicWriteFile(barak.rootDir+"/pidfile", []byte(Fmt("%v", barak.pid)))
+	if err != nil {
+		panic(Fmt("Error writing pidfile: %v", err))
+	}
+
 	TrapSignal(func() {
 		fmt.Println("Barak shutting down")
 	})