feat: return non-zero exit code if error

Author: marjune163

main.go

@@ -2,8 +2,12 @@ package main
 
 import (
 	"mjpclab.dev/ghfs/src"
+	"os"
 )
 
 func main() {
-	src.Main()
+	ok := src.Main()
+	if !ok {
+		os.Exit(1)
+	}
 }

src/main.go

@@ -37,19 +37,19 @@ func reopenLogOnHup(appInst *app.App) {
 	}()
 }
 
-func Main() {
+func Main() (ok bool) {
 	// params
 	params, printVersion, printHelp, errs := param.ParseFromCli()
 	if serverError.CheckError(errs...) {
 		return
 	}
 	if printVersion {
 		version.PrintVersion()
-		return
+		return true
 	}
 	if printHelp {
 		param.PrintHelp()
-		return
+		return true
 	}
 
 	// settings
@@ -77,5 +77,9 @@ func Main() {
 	cleanupOnEnd(appInst)
 	reopenLogOnHup(appInst)
 	errs = appInst.Open()
-	serverError.CheckError(errs...)
+	if serverError.CheckError(errs...) {
+		return
+	}
+
+	return true
 }