fix: run update command as detached process

Author: mlataza

cmd/agent_smith/run_command_unix.go

@@ -0,0 +1,17 @@
+//go:build darwin || linux
+
+package main
+
+import (
+	"os"
+	"os/exec"
+	"syscall"
+)
+
+func detachedCommand(path string, args []string, stdout, stderr *os.File) *exec.Cmd {
+	cmd := exec.Command(path, args...)
+	cmd.Stdout = stdout
+	cmd.Stderr = stderr
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
+	return cmd
+}

cmd/agent_smith/run_command_windows.go

@@ -0,0 +1,19 @@
+//go:build windows
+
+package main
+
+import (
+	"os"
+	"os/exec"
+	"syscall"
+)
+
+func detachedCommand(path string, args []string, stdout, stderr *os.File) *exec.Cmd {
+	cmd := exec.Command(path, args...)
+	cmd.Stdout = stdout
+	cmd.Stderr = stderr
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
+	}
+	return cmd
+}

cmd/agent_smith/service.go

@@ -8,7 +8,6 @@ import (
 	"io"
 	"net/http"
 	"os"
-	"os/exec"
 	"runtime"
 	"strings"
 	"time"
@@ -109,7 +108,7 @@ func (svc *serviceContext) Execute(
 			&device,
 			"https://api.github.com/repos/rewstapp/agent-smith-go/releases/latest",
 			func(path string, args []string) error {
-				return exec.Command(path, args...).Start()
+				return detachedCommand(path, args, logFile, logFile).Start()
 			},
 		)
 		runner := agent.NewAutoUpdateRunner(logger, updater, agent.DefaultUpdateInterval(), 5, 5*time.Minute)