fix Chart.yaml handling

Signed-off-by: Matt Farina <matt.farina@suse.com>
(cherry picked from commit f13afaacd6)

pkg/chartutil/dependencies.go

@@ -16,6 +16,7 @@ limitations under the License.
 package chartutil
 
 import (
+	"fmt"
 	"log"
 	"strings"
 
@@ -255,8 +256,8 @@ func processImportValues(c *chart.Chart, merge bool) error {
 		for _, riv := range r.ImportValues {
 			switch iv := riv.(type) {
 			case map[string]interface{}:
-				child := iv["child"].(string)
-				parent := iv["parent"].(string)
+				child := fmt.Sprintf("%v", iv["child"])
+				parent := fmt.Sprintf("%v", iv["parent"])
 
 				outiv = append(outiv, map[string]string{
 					"child":  child,

pkg/lint/rules/chartfile.go

@@ -151,6 +151,9 @@ func validateChartVersion(cf *chart.Metadata) error {
 
 func validateChartMaintainer(cf *chart.Metadata) error {
 	for _, maintainer := range cf.Maintainers {
+		if maintainer == nil {
+			return errors.New("a maintainer entry is empty")
+		}
 		if maintainer.Name == "" {
 			return errors.New("each maintainer requires a name")
 		} else if maintainer.Email != "" && !govalidator.IsEmail(maintainer.Email) {

pkg/lint/rules/chartfile_test.go

@@ -143,6 +143,16 @@ func TestValidateChartMaintainer(t *testing.T) {
 			t.Errorf("validateChartMaintainer(%s, %s) to return no error, got %s", test.Name, test.Email, err.Error())
 		}
 	}
+
+	// Testing for an empty maintainer
+	badChart.Maintainers = []*chart.Maintainer{nil}
+	err := validateChartMaintainer(badChart)
+	if err == nil {
+		t.Errorf("validateChartMaintainer did not return error for nil maintainer as expected")
+	}
+	if err.Error() != "a maintainer entry is empty" {
+		t.Errorf("validateChartMaintainer returned unexpected error for nil maintainer: %s", err.Error())
+	}
 }
 
 func TestValidateChartSources(t *testing.T) {