made indexAll and retagAll atomic and faster

pkg/db/helper.go

@@ -27,3 +27,15 @@ func validatePassword(pw string) (b []byte) {
 	b = hash.Sum(nil)
 	return
 }
+
+func eq(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i, v := range a {
+		if v != b[i] {
+			return false
+		}
+	}
+	return true
+}