added basic cache partitioning

Author: djcass44

pkg/downloader/downloader.go

@@ -30,7 +30,13 @@ func (d *Downloader) Download(ctx context.Context, src string) (string, error) {
 
 	// download the file to a predictable location so that
 	// we can avoid repeated downloads
-	dst := filepath.Join(d.cacheDir, filepath.Base(uri.Path))
+	dst := filepath.Join(d.cacheDir, uri.Hostname(), filepath.Base(uri.Path))
+	// create the parent directory so that we don't
+	// have any name clashes between different repositories
+	if err := os.MkdirAll(filepath.Dir(dst), 0755); err != nil {
+		log.Error(err, "failed to create parent directory", "dir", filepath.Dir(dst))
+		return "", err
+	}
 	log.V(1).Info("downloading file", "src", src, "dst", dst)
 
 	if _, err := os.Stat(dst); !os.IsNotExist(err) {