feat(cmd): add --tty flag to run commands from a script

cli/app/cmd.go

@@ -47,6 +47,7 @@ Example:
 		internal.DebugFlag,
 		internal.LocalCmdFlag,
 		internal.RemoteUserFlag,
+		internal.TtyFlag,
 	},
 	BashComplete: autocomplete.AppNameComplete,
 	Before:       internal.SubCommandBefore,
@@ -236,6 +237,9 @@ func runCmdRemote(cl *dockerClient.Client, app config.App, abraSh, serviceName,
 
 	execCreateOpts.Cmd = cmd
 	execCreateOpts.Tty = true
+	if internal.Tty {
+		execCreateOpts.Tty = false
+	}
 
 	if err := container.RunExec(dcli, cl, targetContainer.ID, &execCreateOpts); err != nil {
 		return err

cli/internal/cli.go

@@ -58,6 +58,16 @@ var ChaosFlag = &cli.BoolFlag{
 	Destination: &Chaos,
 }
 
+// Disable tty to run commands from script
+var Tty bool
+
+// TtyFlag turns on/off tty mode.
+var TtyFlag = &cli.BoolFlag{
+	Name:        "tty, T",
+	Usage:       "Disables TTY mode to run this command from a script.",
+	Destination: &Tty,
+}
+
 // DNSProvider specifies a DNS provider.
 var DNSProvider string