🐛 added multigroup check while creating resource

This change does the following:
  - introduces book-keeping of scaffolded resources in PROJECT file
  - Validates if new resource belong to existing scaffolded groups

pkg/scaffold/api.go

@@ -143,6 +143,10 @@ func (api *API) scaffoldV2() error {
 	r := api.Resource
 
 	if api.DoResource {
+		if err := api.validateResourceGroup(r); err != nil {
+			return err
+		}
+
 		fmt.Println(filepath.Join("api", r.Version,
 			fmt.Sprintf("%s_types.go", strings.ToLower(r.Kind))))
 
@@ -177,6 +181,15 @@ func (api *API) scaffoldV2() error {
 		if err != nil {
 			return fmt.Errorf("error updating kustomization.yaml: %v", err)
 		}
+
+		// update scaffolded resource in project file
+		api.project.Resources = append(api.project.Resources,
+			input.Resource{Group: r.Group, Version: r.Version, Kind: r.Kind})
+		err = saveProjectFile("PROJECT", api.project)
+		if err != nil {
+			fmt.Printf("error updating project file with resource information : %v \n", err)
+		}
+
 	} else {
 		// disable generation of example reconcile body if not scaffolding resource
 		// because this could result in a fork-bomb of k8s resources where watching a
@@ -212,3 +225,14 @@ func (api *API) scaffoldV2() error {
 
 	return nil
 }
+
+// Since we support single group only in v2 scaffolding, validate if resource
+// being created belongs to existing group.
+func (api *API) validateResourceGroup(resource *resourcev1.Resource) error {
+	for _, existingGroup := range api.project.ResourceGroups() {
+		if strings.ToLower(resource.Group) != strings.ToLower(existingGroup) {
+			return fmt.Errorf("Group '%s' is not same as existing group '%s'. Multiple groups are not supported yet.", resource.Group, existingGroup)
+		}
+	}
+	return nil
+}

pkg/scaffold/input/input.go

@@ -169,4 +169,29 @@ type ProjectFile struct {
 
 	// Repo is the go package name of the project root
 	Repo string `yaml:"repo,omitempty"`
+
+	// Resources tracks scaffolded resources in the project. This info is
+	// tracked only in project with version 2.
+	Resources []Resource `yaml:"resources,omitempty"`
+}
+
+// ResourceGroups returns unique groups of scaffolded resources in the project.
+func (pf *ProjectFile) ResourceGroups() []string {
+	groupSet := map[string]struct{}{}
+	for _, r := range pf.Resources {
+		groupSet[r.Group] = struct{}{}
+	}
+
+	groups := []string{}
+	for g, _ := range groupSet {
+		groups = append(groups, g)
+	}
+	return groups
+}
+
+// Resource contains information about scaffolded resources.
+type Resource struct {
+	Group   string `yaml:"group,omitempty"`
+	Version string `yaml:"version,omitempty"`
+	Kind    string `yaml:"kind,omitempty"`
 }

pkg/scaffold/scaffold.go

@@ -105,6 +105,19 @@ func LoadProjectFile(path string) (input.ProjectFile, error) {
 	return p, nil
 }
 
+// saveProjectFile saves the given ProjectFile at the given path.
+func saveProjectFile(path string, project *input.ProjectFile) error {
+	content, err := yaml.Marshal(project)
+	if err != nil {
+		return fmt.Errorf("error marshalling project info %v", err)
+	}
+	err = ioutil.WriteFile(path, content, os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("failed to save project file at %s %v", path, err)
+	}
+	return nil
+}
+
 // GetBoilerplate reads the boilerplate file
 func getBoilerplate(path string) (string, error) {
 	b, err := ioutil.ReadFile(path) // nolint: gosec

testdata/project-v2/PROJECT

@@ -1,3 +1,10 @@
 version: "2"
 domain: testproject.org
 repo: sigs.k8s.io/kubebuilder/testdata/project-v2
+resources:
+- group: crew
+  version: v1
+  kind: Captain
+- group: crew
+  version: v1
+  kind: FirstMate