add validation for the name of the project in the init

cmd/init_project.go

@@ -21,6 +21,7 @@ import (
 	"log"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"regexp"
 	"strconv"
 	"strings"
@@ -137,6 +138,20 @@ func (o *projectOptions) validate() error {
 			return err
 		}
 	}
+
+	// use directory name as prefix
+	dir, err := os.Getwd()
+	if err != nil {
+		return fmt.Errorf("error to get the current path: %v", err)
+	}
+
+	// check if the name of th project pass is a valid name for k8s objects
+	// it will be used to create the namespace
+	projectName := filepath.Base(dir)
+	if err := util.IsValidName(strings.ToLower(projectName)); err != nil {
+		return fmt.Errorf("project name (%v) is invalid: (%v)", projectName, err)
+	}
+
 	if o.project.Repo == "" {
 		repoPath, err := findCurrentRepo()
 		if err != nil {

cmd/util/validations.go

@@ -0,0 +1,51 @@
+package util
+
+import (
+	"fmt"
+	"regexp"
+)
+
+// The following code came from "k8s.io/apimachinery/pkg/util/validation/validation.go"
+// If be required the usage of more funcs from this then please replace it for the import
+// ---------------------------------------
+
+const (
+	qnameCharFmt string = "[a-z0-9]([-a-z0-9]*[a-z0-9])?"
+	// The value is 56 because it will be contact with "-system" = 63
+    qualifiedNameMaxLength int = 56
+)
+var qualifiedNameRegexp = regexp.MustCompile("^" + qnameCharFmt + "$")
+
+//IsValidName used to check the name of the project
+func IsValidName(value string) []string {
+	var errs []string
+	if len(value) > qualifiedNameMaxLength {
+		errs = append(errs, MaxLenError(qualifiedNameMaxLength))
+	}
+	if !qualifiedNameRegexp.MatchString(value) {
+		errs = append(errs, RegexError("invalid value for project name", qnameCharFmt))
+	}
+	return errs
+}
+
+// RegexError returns a string explanation of a regex validation failure.
+func RegexError(msg string, fmt string, examples ...string) string {
+	if len(examples) == 0 {
+		return msg + " (regex used for validation is '" + fmt + "')"
+	}
+	msg += " (e.g. "
+	for i := range examples {
+		if i > 0 {
+			msg += " or "
+		}
+		msg += "'" + examples[i] + "', "
+	}
+	msg += "regex used for validation is '" + fmt + "')"
+	return msg
+}
+
+// MaxLenError returns a string explanation of a "string too long" validation
+// failure.
+func MaxLenError(length int) string {
+	return fmt.Sprintf("must be no more than %d characters", length)
+}

pkg/scaffold/project/kustomize.go

@@ -19,6 +19,7 @@ package project
 import (
 	"os"
 	"path/filepath"
+	"strings"
 
 	"sigs.k8s.io/kubebuilder/pkg/scaffold/input"
 )
@@ -44,7 +45,7 @@ func (c *Kustomize) GetInput() (input.Input, error) {
 		if err != nil {
 			return input.Input{}, err
 		}
-		c.Prefix = filepath.Base(dir)
+		c.Prefix = strings.ToLower(filepath.Base(dir))
 	}
 	c.TemplateBody = kustomizeTemplate
 	c.Input.IfExistsAction = input.Error

pkg/scaffold/v2/kustomize.go

@@ -19,6 +19,7 @@ package v2
 import (
 	"os"
 	"path/filepath"
+	"strings"
 
 	"sigs.k8s.io/kubebuilder/pkg/scaffold/input"
 )
@@ -44,7 +45,7 @@ func (c *Kustomize) GetInput() (input.Input, error) {
 		if err != nil {
 			return input.Input{}, err
 		}
-		c.Prefix = filepath.Base(dir)
+		c.Prefix = strings.ToLower(filepath.Base(dir))
 	}
 	c.TemplateBody = kustomizeTemplate
 	c.Input.IfExistsAction = input.Error