Fix some using gosec

cmd/launch.go

@@ -124,7 +124,11 @@ var launchCmd = &cobra.Command{
 		c := exec.Command(trackCommand[0], trackCommand[1:]...)
 		envs = append(envs, fmt.Sprintf("PID=%s", pidStr))
 		c.Env = envs
-		c.Start()
+		err = c.Start()
+		if err != nil {
+			_, _ = fmt.Fprintf(os.Stderr, "%s\n", err)
+			os.Exit(1)
+		}
 
 		fmt.Printf("%s %s\n", color.Magenta("Launched:", color.B), strings.Join(trackCommand, " "))
 	},

cmd/option.go

@@ -168,7 +168,10 @@ func optionSlackChannel(slackChannel string, nonInteractive bool) (option, error
 			_, _ = fmt.Fprintf(os.Stderr, "%s\n", errors.New("Invalid URL"))
 			return optionSlackChannel(slackChannel, nonInteractive)
 		}
-		os.Setenv("SLACK_INCOMMING_WEBHOOK_URL", url)
+		err := os.Setenv("SLACK_INCOMMING_WEBHOOK_URL", url)
+		if err != nil {
+			return option{}, err
+		}
 	}
 	slackChannel = prompter.Prompt("Enter slack channel", slackChannel)
 	fmt.Println("")

cmd/slack.go

@@ -69,9 +69,12 @@ func notifySlack(webhookURL string, slackChannel string, slackMention string, tr
 		}
 		attachment.Footer = hostname
 		payload.AddAttachment(&attachment)
-		slack.Client{
+		err := slack.Client{
 			WebhookURL: webhookURL,
 		}.Post(&payload)
+		if err != nil {
+			return err
+		}
 		return nil
 	}
 }

metrics/metrics_linux.go

@@ -1,4 +1,5 @@
 // +build linux
+
 package metrics
 
 import (