return non-zero exit code when file transfers failed

Author: majewsky

main.go

@@ -55,11 +55,12 @@ func main() {
 	}
 
 	//start workers
-	Run(&SharedState{
+	exitCode := Run(&SharedState{
 		Configuration: *config,
 		Context:       context.Background(),
 	})
 
 	Gauge("last_run.duration_seconds", int64(time.Since(startTime).Seconds()), 1.0)
 	Log(LogInfo, "finished in %s", time.Since(startTime).String())
+	os.Exit(exitCode)
 }

threads.go

@@ -44,7 +44,7 @@ type SharedState struct {
 }
 
 //Run starts and orchestrates the various worker threads.
-func Run(state *SharedState) {
+func Run(state *SharedState) (exitCode int) {
 	//receive SIGINT/SIGTERM signals
 	sigs := make(chan os.Signal, 1)
 	signal.Notify(sigs, os.Interrupt, syscall.SIGTERM)
@@ -75,15 +75,19 @@ func Run(state *SharedState) {
 	Gauge("last_run.files_failed", int64(state.FilesFailed), 1.0)
 	if state.FilesFailed > 0 {
 		Gauge("last_run.success", 0, 1.0)
+		exitCode = 1
 	} else {
 		Gauge("last_run.success", 1, 1.0)
+		exitCode = 0
 	}
 
 	//report results
 	Log(LogInfo, "%d dirs scanned, %d files found, %d transferred, %d failed",
 		state.DirectoriesScanned, state.FilesFound,
 		state.FilesTransferred, state.FilesFailed,
 	)
+
+	return
 }
 
 func makeScraperThread(state *SharedState) <-chan File {