🐛 regression - extracommands require a valid PROJECT file again

* Handle failing on 3-alpha configs
* Set project fields to default if the stable version is registered
* Added IsRegistered command to registry

Signed-off-by: jesus m. rodriguez <jesusr@redhat.com>

pkg/cli/cli.go

@@ -29,6 +29,7 @@ import (
 	"sigs.k8s.io/kubebuilder/v3/pkg/config"
 	yamlstore "sigs.k8s.io/kubebuilder/v3/pkg/config/store/yaml"
 	"sigs.k8s.io/kubebuilder/v3/pkg/machinery"
+	"sigs.k8s.io/kubebuilder/v3/pkg/model/stage"
 	"sigs.k8s.io/kubebuilder/v3/pkg/plugin"
 )
 
@@ -144,8 +145,21 @@ func newCLI(options ...Option) (*CLI, error) {
 func (c *CLI) buildCmd() error {
 	c.cmd = c.newRootCmd()
 
+	var uve config.UnsupportedVersionError
+
 	// Get project version and plugin keys.
-	if err := c.getInfo(); err != nil {
+	switch err := c.getInfo(); {
+	case err == nil:
+	case errors.As(err, &uve) && uve.Version.Compare(config.Version{Number: 3, Stage: stage.Alpha}) == 0:
+		// Check if the corresponding stable version exists, set c.projectVersion and break
+		stableVersion := config.Version{
+			Number: uve.Version.Number,
+		}
+		if config.IsRegistered(stableVersion) {
+			// Get project version and plugin info from defaults
+			c.getInfoFromDefaults()
+		}
+	default:
 		return err
 	}
 

pkg/config/registry.go

@@ -25,6 +25,12 @@ func Register(version Version, constructor func() Config) {
 	registry[version] = constructor
 }
 
+// IsRegistered returns true if the given version has been registered through Register
+func IsRegistered(version Version) bool {
+	_, ok := registry[version]
+	return ok
+}
+
 // New creates Config instances from the previously registered implementations through Register
 func New(version Version) (Config, error) {
 	if constructor, exists := registry[version]; exists {