From 2b190eccb73ec5abdd252e2604c59b9ab5997965 Mon Sep 17 00:00:00 2001
From: Shane C <shane@scaffoe.com>
Date: Thu, 11 Jul 2024 16:34:08 -0400
Subject: [PATCH] fix goroutine call for commands with no handlers

---
 linux/run.go | 58 ++++++++++++++++++++++++++++------------------------
 1 file changed, 31 insertions(+), 27 deletions(-)

diff --git a/linux/run.go b/linux/run.go
index 960fd37..52b0469 100644
--- a/linux/run.go
+++ b/linux/run.go
@@ -119,40 +119,44 @@ func (cmd *LinuxCommand) Run() error {
 		}
 	}
 
-	cmd.wg.Add(3)
+	cmd.wg.Add(1)
 
-	go func() {
-		defer cmd.wg.Done()
-		scanner := bufio.NewScanner(cmd.stderr)
-		for scanner.Scan() {
-			line := scanner.Text()
-			if h, ok := cmd.handlers[EventOutput]; ok {
-				if err := h.(func(data EventOutputData) error)(EventOutputData{
-					Output:     line,
-					CmdOptions: cmd.Options,
-				}); err != nil {
-					return
+	if len(cmd.handlers) != 0 {
+		cmd.wg.Add(2)
+
+		go func() {
+			defer cmd.wg.Done()
+			scanner := bufio.NewScanner(cmd.stderr)
+			for scanner.Scan() {
+				line := scanner.Text()
+				if h, ok := cmd.handlers[EventOutput]; ok {
+					if err := h.(func(data EventOutputData) error)(EventOutputData{
+						Output:     line,
+						CmdOptions: cmd.Options,
+					}); err != nil {
+						return
+					}
 				}
 			}
-		}
-	}()
+		}()
 
-	go func() {
-		defer cmd.wg.Done()
+		go func() {
+			defer cmd.wg.Done()
 
-		scanner := bufio.NewScanner(cmd.stdout)
-		for scanner.Scan() {
-			line := scanner.Text()
-			if h, ok := cmd.handlers[EventOutput]; ok {
-				if err := h.(func(data EventOutputData) error)(EventOutputData{
-					Output:     line,
-					CmdOptions: cmd.Options,
-				}); err != nil {
-					return
+			scanner := bufio.NewScanner(cmd.stdout)
+			for scanner.Scan() {
+				line := scanner.Text()
+				if h, ok := cmd.handlers[EventOutput]; ok {
+					if err := h.(func(data EventOutputData) error)(EventOutputData{
+						Output:     line,
+						CmdOptions: cmd.Options,
+					}); err != nil {
+						return
+					}
 				}
 			}
-		}
-	}()
+		}()
+	}
 
 	go func() {
 		defer cmd.wg.Done()