remote controller: Fix entrypoint interaction bugs

Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com>

monitor/commands/exec.go

@@ -41,6 +41,7 @@ func (cm *ExecCmd) Exec(ctx context.Context, args []string) error {
 	cfg := controllerapi.InvokeConfig{
 		Entrypoint: []string{args[1]},
 		Cmd:        args[2:],
+		NoCmd:      false,
 		// TODO: support other options as well via flags
 		Env:  cm.invokeConfig.Env,
 		User: cm.invokeConfig.User,

monitor/commands/rollback.go

@@ -47,6 +47,7 @@ func (cm *RollbackCmd) Exec(ctx context.Context, args []string) error {
 		if len(cmds) > 0 {
 			cfg.Entrypoint = []string{cmds[0]}
 			cfg.Cmd = cmds[1:]
+			cfg.NoCmd = false
 		}
 	}
 	id := cm.m.Rollback(ctx, cfg)

monitor/monitor.go

@@ -283,6 +283,7 @@ func (m *monitor) startInvoke(ctx context.Context, pid string, cfg controllerapi
 	if len(cfg.Entrypoint) == 0 && len(cfg.Cmd) == 0 {
 		cfg.Entrypoint = []string{"sh"} // launch shell by default
 		cfg.Cmd = []string{}
+		cfg.NoCmd = false
 	}
 	go func() {
 		// Start a new invoke