added NoRestart option

README.md

@@ -126,7 +126,7 @@ See [Config](https://godoc.org/github.com/jpillora/overseer#Config)uration optio
 	func main() {
 		overseer.Run(overseer.Config{
 			Program: prog,
-			NoRestartAfterFetch: true
+			NoRestart: true,
 			Fetcher: &fetcher.HTTP{
 				URL:      "http://localhost:4000/binaries/myapp",
 				Interval: 1 * time.Second,

overseer.go

@@ -47,7 +47,11 @@ type Config struct {
 	Debug bool
 	//NoWarn disables warning [overseer] logs.
 	NoWarn bool
+	//NoRestart disables all restarts, this option essentially converts
+	//the RestartSignal into a "ShutdownSignal".
+	NoRestart bool
 	//NoRestartAfterFetch disables automatic restarts after each upgrade.
+	//Though manual restarts using the RestartSignal can still be performed.
 	NoRestartAfterFetch bool
 	//Fetcher will be used to fetch binaries.
 	Fetcher fetcher.Interface

proc_master.go

@@ -368,9 +368,10 @@ func (mp *master) fork() error {
 			}
 		}
 		mp.debugf("prog exited with %d", code)
-		//if a restart wasn't requested, proxy
-		//through the exit code via the main process
-		if !mp.restarting {
+		//if a restarts are disabled or if it was an
+		//unexpected creash, proxy this exit straight
+		//through to the main process
+		if mp.NoRestart || !mp.restarting {
 			os.Exit(code)
 		}
 	case <-mp.descriptorsReleased:

proc_slave.go

@@ -127,15 +127,19 @@ func (sp *slave) watchSignal() {
 		signal.Stop(signals)
 		sp.debugf("graceful shutdown requested")
 		//master wants to restart,
-		sp.state.GracefulShutdown <- true
+		close(sp.state.GracefulShutdown)
 		//release any sockets and notify master
 		if len(sp.listeners) > 0 {
 			//perform graceful shutdown
 			for _, l := range sp.listeners {
 				l.release(sp.Config.TerminateTimeout)
 			}
-			//signal release of held sockets
-			sp.masterProc.Signal(SIGUSR1)
+			//signal release of held sockets, allows master to start
+			//a new process before this child has actually exited.
+			//early restarts not supported with restarts disabled.
+			if !sp.NoRestart {
+				sp.masterProc.Signal(SIGUSR1)
+			}
 			//listeners should be waiting on connections to close...
 		}
 		//start death-timer