refactor for using repomaint

internal/cache/refresh.go

@@ -2,21 +2,21 @@ package cache
 
 import "path/filepath"
 
-func (c *Cache) Refresh() error {
+func (c *Cache) FetchDB() error {
 	if !c.refreshMu.TryLock() {
 		return nil
 	}
 	defer c.refreshMu.Unlock()
 
 	for _, repo := range c.cfg.mirroredRepos {
-		if err := c.refreshDB(repo); err != nil {
+		if err := c.fetchDB(repo); err != nil {
 			return err
 		}
 	}
 	return nil
 }
 
-func (c *Cache) refreshDB(repo string) error {
+func (c *Cache) fetchDB(repo string) error {
 	dbFile := repo + ".db.tar.gz"
 	dbPath := filepath.Join(repo, "os/x86_64", dbFile)
 	_, _, err := c.getStream(dbPath)