Handle --no-build and --watch args

Signed-off-by: Joana Hrotko <joana.hrotko@docker.com>

cmd/compose/up.go

@@ -147,8 +147,8 @@ func validateFlags(up *upOptions, create *createOptions) error {
 		}
 		up.Detach = true
 	}
-	if create.Build && create.noBuild {
-		return fmt.Errorf("--build and --no-build are incompatible")
+	if create.noBuild && (create.Build || up.watch) {
+		return fmt.Errorf("--no-build is incompatible with --build and --watch")
 	}
 	if up.Detach && (up.attachDependencies || up.cascadeStop || len(up.attach) > 0) {
 		return fmt.Errorf("--detach cannot be combined with --abort-on-container-exit, --attach or --attach-dependencies")

cmd/formatter/shortcut.go

@@ -259,6 +259,12 @@ func (lk *LogKeyboard) StartWatch(ctx context.Context, project *types.Project, o
 	} else {
 		eg.Go(tracing.EventWrapFuncForErrGroup(ctx, "menu/watch", tracing.SpanOptions{},
 			func(ctx context.Context) error {
+				if options.Create.Build == nil {
+					err := fmt.Errorf("Cannot run watch mode with flag --no-build")
+					lk.keyboardError("Watch", err)
+					return err
+				}
+
 				lk.Watch.newContext(ctx)
 				buildOpts := *options.Create.Build
 				buildOpts.Quiet = true