update for v3 and update tests

Signed-off-by: Janit Sriganeshaelankovan <janits_27@hotmail.com>

internal/chart/v3/lint/rules/chartfile.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"regexp"
 
 	"github.com/Masterminds/semver/v3"
 	"github.com/asaskevich/govalidator"
@@ -31,6 +32,13 @@ import (
 	chartutil "helm.sh/helm/v4/internal/chart/v3/util"
 )
 
+// chartName is a regular expression for testing the supplied name of a chart.
+var chartName = regexp.MustCompile(`^[a-z0-9]+(-[a-z0-9]+)*$`)
+
+// maxChartNameLength is lower than the limits we know of with certain file systems,
+// and with certain Kubernetes fields.
+const maxChartNameLength = 250
+
 // Chartfile runs a set of linter rules related to Chart.yaml file
 func Chartfile(linter *support.Linter) {
 	chartFileName := "Chart.yaml"
@@ -113,12 +121,11 @@ func validateChartYamlStrictFormat(chartFileError error) error {
 }
 
 func validateChartName(cf *chart.Metadata) error {
-	if cf.Name == "" {
+	if cf.Name == "" || len(cf.Name) > maxChartNameLength {
-		return errors.New("name is required")
+		return fmt.Errorf("chart name must be between 1 and %d characters", maxChartNameLength)
 	}
-	name := filepath.Base(cf.Name)
+	if !chartName.MatchString(cf.Name) {
-	if name != cf.Name {
+		return fmt.Errorf("chart name must use only lowercase letters or digits optionally with dash separators")
-		return fmt.Errorf("chart name %q is invalid", cf.Name)
 	}
 	return nil
 }

internal/chart/v3/lint/rules/chartfile_test.go

@@ -272,7 +272,7 @@ func TestV3Chartfile(t *testing.T) {
 			return
 		}
 
-		if !strings.Contains(msgs[0].Err.Error(), "name is required") {
+		if !strings.Contains(msgs[0].Err.Error(), "chart name must be between 1 and 250 characters") {
 			t.Errorf("Unexpected message 0: %s", msgs[0].Err)
 		}
 

internal/chart/v3/util/create.go

@@ -35,7 +35,7 @@ import (
 // This regular expression is probably stricter than it needs to be. We can relax it
 // somewhat. Newline characters, as well as $, quotes, +, parens, and % are known to be
 // problematic.
-var chartName = regexp.MustCompile("^[a-zA-Z0-9._-]+$")
+var chartName = regexp.MustCompile(`^[a-z0-9]+(-[a-z0-9]+)*$`)
 
 const (
 	// ChartfileName is the default Chart file name.
@@ -828,7 +828,7 @@ func validateChartName(name string) error {
 		return fmt.Errorf("chart name must be between 1 and %d characters", maxChartNameLength)
 	}
 	if !chartName.MatchString(name) {
-		return fmt.Errorf("chart name must match the regular expression %q", chartName.String())
+		return fmt.Errorf("chart name must use only lowercase letters or digits optionally with dash separators")
 	}
 	return nil
 }

internal/chart/v3/util/create_test.go

@@ -147,8 +147,10 @@ func TestCreate_Overwrite(t *testing.T) {
 func TestValidateChartName(t *testing.T) {
 	for name, shouldPass := range map[string]bool{
 		"":                              false,
-		"abcdefghijklmnopqrstuvwxyz-_.": true,
+		"abcdefghijklmnopqrstuvwxyz-_.": false,
-		"ABCDEFGHIJKLMNOPQRSTUVWXYZ-_.": true,
+		"abcdefghijklmnopqrstuvwxyz":    true,
+		"abcdefghijklm-nopqrstuvwxyz":   true,
+		"ABCDEFGHIJKLMNOPQRSTUVWXYZ-_.": false,
 		"$hello":                        false,
 		"Hellô":                         false,
 		"he%%o":                         false,

pkg/chart/v2/lint/rules/chartfile_test.go

@@ -299,7 +299,7 @@ func TestChartfile(t *testing.T) {
 			return
 		}
 
-		if !strings.Contains(msgs[0].Err.Error(), "name is required") {
+		if !strings.Contains(msgs[0].Err.Error(), "chart name must be between 1 and 250 characters") {
 			t.Errorf("Unexpected message 0: %s", msgs[0].Err)
 		}