Propagate query string arguments in repository URL to absolute chart URL

(cherry picked from commit db69200152)

pkg/repo/chartrepo.go

@@ -270,5 +270,8 @@ func ResolveReferenceURL(baseURL, refURL string) (string, error) {
 		return "", fmt.Errorf("failed to parse %s as URL: %v", refURL, err)
 	}
 
-	return parsedBaseURL.ResolveReference(parsedRefURL).String(), nil
+	resolvedURL := parsedBaseURL.ResolveReference(parsedRefURL)
+	resolvedURL.RawQuery = parsedBaseURL.RawQuery
+
+	return resolvedURL.String(), nil
 }

pkg/repo/chartrepo_test.go

@@ -287,6 +287,14 @@ func TestResolveReferenceURL(t *testing.T) {
 		t.Errorf("%s", chartURL)
 	}
 
+	chartURL, err = ResolveReferenceURL("http://localhost:8123/charts/?st=2018-08-06T22%3A59%3A04Z&se=2018-08-07T22%3A59%3A04Z&sp=rl&sv=2018-03-28&sr=c&sig=cyqM4%2F5G7HNk%2F3faaHSDMaWxFxefCglvZlYSnmQBwiY%3D", "nginx-0.2.0.tgz")
+	if err != nil {
+		t.Errorf("%s", err)
+	}
+	if chartURL != "http://localhost:8123/charts/nginx-0.2.0.tgz?st=2018-08-06T22%3A59%3A04Z&se=2018-08-07T22%3A59%3A04Z&sp=rl&sv=2018-03-28&sr=c&sig=cyqM4%2F5G7HNk%2F3faaHSDMaWxFxefCglvZlYSnmQBwiY%3D" {
+		t.Errorf("%s does not contain the query string of the base URL", chartURL)
+	}
+
 	chartURL, err = ResolveReferenceURL("http://localhost:8123", "https://kubernetes-charts.storage.googleapis.com/nginx-0.2.0.tgz")
 	if err != nil {
 		t.Errorf("%s", err)