Cloner: sync - check fingerprint before costy discovery

Signed-off-by: Václav Valíček <valicek1994@gmail.com>

repo_cloner/lib/cloner.py

@@ -1,9 +1,9 @@
 from repo_cloner.lib import gen_repo_hashed_name
 from repo_cloner.lib import DirNotFoundError
-from repo_cloner.lib import ClonerConfig, DiskStoredList, RepoDirStructure, RepoTool
+from repo_cloner.lib import ClonerConfig, DiskStoredList, RepoDirStructure, RepoTool, DetectedCommit, Detector
 
 from pathlib import Path
-from typing import Optional
+from typing import Optional, Callable
 from time import time
 import os
 import logging
@@ -119,11 +119,17 @@ class Cloner:
 		if not self._config.cloner_submodules:
 			return self._repo.fetch()
 
+		fingerprint = self._repo.repo_fingerprint
+
 		# recursive now
 		if not self._repo.fetch():
 			log.critical(f"Repo fetch failed for {self._config.cloner_project_name}")
 			return False
 
+		if fingerprint == self._repo.repo_fingerprint:
+			log.info(f"Repo fingerpring unchanged - submodule discovery skipped")
+			return True
+
 		log.debug(f"Loading submodules.cache")
 		submodules = DiskStoredList(os.path.join(self.__submodule_cache, "submodules.cache"))
 		log.debug(f"Loaded submodules.cache - {len(submodules)} items")
@@ -207,3 +213,7 @@ class Cloner:
 	@property
 	def detector_enabled(self) -> bool:
 		return os.path.exists(os.path.join(self._dirs.conf_dir, self.__detector_cfg))
+
+	def run_detector(self, callback: Callable[[DetectedCommit], None]):
+		detector = Detector(self.__main_repo_path, self._dirs.cache_dir, self._config.cloner_project_name)
+		detector.run(callback)