Fix child process priority for tty (#18)

Author: cmoog

localexec_unix.go

@@ -91,14 +91,14 @@ func (l LocalExecer) Start(ctx context.Context, c Command) (Process, error) {
 		if err != nil {
 			return nil, xerrors.Errorf("start command: %w", err)
 		}
+	}
 
-		if l.ChildProcessPriority != nil {
-			pid := process.cmd.Process.Pid
-			niceness := *l.ChildProcessPriority
-			err := syscall.Setpriority(syscall.PRIO_PROCESS, pid, niceness)
-			if err != nil {
-				return nil, xerrors.Errorf("set process (pid: %d) priority to (niceness: %d): %w", pid, niceness, err)
-			}
+	if l.ChildProcessPriority != nil {
+		pid := process.cmd.Process.Pid
+		niceness := *l.ChildProcessPriority
+		err := syscall.Setpriority(syscall.PRIO_PROCESS, pid, niceness)
+		if err != nil {
+			return nil, xerrors.Errorf("set process (pid: %d) priority to (niceness: %d): %w", pid, niceness, err)
 		}
 	}