Address some linting problems

cmd/deploy.go

@@ -55,5 +55,7 @@ If deployment failed, then rolls back to the previous stack definition.`,
 func init() {
 	rootCmd.AddCommand(deployCmd)
 	deployCmd.PersistentFlags().StringSliceP("service", "s", []string{}, "Names of services to update. Can be specified multiple times for parallel deployment")
-	viper.BindPFlag("deploy.services", deployCmd.PersistentFlags().Lookup("service"))
+	if err := viper.BindPFlag("deploy.services", deployCmd.PersistentFlags().Lookup("service")); err != nil {
+		log.WithError(err).Fatal("can't bind flag to config")
+	}
 }

lib/ssh.go

@@ -132,7 +132,5 @@ func ConnectSSH(profile, cluster, taskDefinitionName, containerName, shell, serv
 
 	env := os.Environ()
 
-	syscall.Exec("/usr/bin/ssh", params, env)
-
-	return 0, nil
+	return 0, syscall.Exec("/usr/bin/ssh", params, env)
 }

lib/ssm.go

@@ -64,7 +64,9 @@ func runProcessor(value string, command []string) (string, error) {
 	}
 	go func() {
 		defer stdin.Close()
-		io.WriteString(stdin, value)
+		if _, err := io.WriteString(stdin, value); err != nil {
+			log.WithError(err).Error("can't write to stdin of the command")
+		}
 	}()
 
 	stdout, err := cmd.StdoutPipe()
@@ -73,7 +75,9 @@ func runProcessor(value string, command []string) (string, error) {
 	}
 	go func() {
 		defer stdout.Close()
-		io.Copy(output, stdout)
+		if _, err := io.Copy(output, stdout); err != nil {
+			log.WithError(err).Error("can't write the command's stdout to output")
+		}
 	}()
 
 	stderr, err := cmd.StderrPipe()
@@ -82,7 +86,9 @@ func runProcessor(value string, command []string) (string, error) {
 	}
 	go func() {
 		defer stderr.Close()
-		io.Copy(os.Stderr, stderr)
+		if _, err := io.Copy(os.Stderr, stderr); err != nil {
+			log.WithError(err).Error("can't write the command's stderr to stderr")
+		}
 	}()
 
 	if err := cmd.Start(); err != nil {