Iterate over dependencies in a chart tarball during lint action

Signed-off-by: manslaughter03 <manslaughter03@gmail.com>

cmd/helm/lint.go

@@ -27,6 +27,7 @@ import (
 	"github.com/spf13/cobra"
 
 	"helm.sh/helm/v4/pkg/action"
+	"helm.sh/helm/v4/pkg/chart/loader"
 	"helm.sh/helm/v4/pkg/chartutil"
 	"helm.sh/helm/v4/pkg/cli/values"
 	"helm.sh/helm/v4/pkg/getter"
@@ -67,6 +68,24 @@ func newLintCmd(out io.Writer) *cobra.Command {
 
 			if client.WithSubcharts {
 				for _, p := range paths {
+					if strings.HasSuffix(p, ".tgz") || strings.HasSuffix(p, ".tar.gz") {
+						c, err := loader.Load(p)
+						if err != nil {
+							return err
+						}
+						for _, d := range c.Dependencies() {
+							tempDir, err := os.MkdirTemp("", "helm-lint")
+							if err != nil {
+								return errors.Wrap(err, "unable to create temp dir to extract tarball")
+							}
+							defer os.RemoveAll(tempDir)
+							archive, err := chartutil.Save(d, tempDir)
+							if err != nil {
+								return err
+							}
+							paths = append(paths, archive)
+						}
+					} else {
 						filepath.Walk(filepath.Join(p, "charts"), func(path string, info os.FileInfo, _ error) error {
 							if info != nil {
 								if info.Name() == "Chart.yaml" {
@@ -79,6 +98,7 @@ func newLintCmd(out io.Writer) *cobra.Command {
 						})
 					}
 				}
+			}
 
 			client.Namespace = settings.Namespace()
 			vals, err := valueOpts.MergeValues(getter.All(settings))