hide those BlobFileChanged warnings, unless it's the last chance

keep it quiet

prime_backup/action/create_backup_action.py

@@ -386,11 +386,14 @@ def attempt_once(last_chance: bool = False) -> Generator[Any, Any, schema.Blob]:
 			# if any yield is done, ensure to check __blob_by_hash_cache again
 
 			def check_changes(new_size: int, new_hash: Optional[str]):
+				def log(s: str):
+					(self.logger.warning if last_chance else self.logger.debug)(s)
+
 				if new_size != st.st_size:
-					self.logger.warning('Blob size mismatch, previous: {}, current: {}'.format(st.st_size, new_size))
+					log('Blob size mismatch, previous: {}, current: {}'.format(st.st_size, new_size))
 					raise _BlobFileChanged()
 				if blob_hash is not None and new_hash is not None and new_hash != blob_hash:
-					self.logger.warning('Blob hash mismatch, previous: {}, current: {}'.format(blob_hash, new_hash))
+					log('Blob hash mismatch, previous: {}, current: {}'.format(blob_hash, new_hash))
 					raise _BlobFileChanged()
 
 			def bp_rba(h: str) -> Path:
@@ -493,8 +496,9 @@ def bp_rba(h: str) -> Path:
 				self.__blob_by_hash_cache[blob.hash] = blob
 				return blob, st
 			except _BlobFileChanged:
-				next_action = 'No more retry' if is_last_attempt else 'Retrying'
-				self.logger.warning('Blob {} stat has changed, has someone modified it? {} (attempt {} / {})'.format(src_path_str, next_action, retry_cnt, _BLOB_FILE_CHANGED_RETRY_COUNT))
+				(self.logger.warning if is_last_attempt else self.logger.debug)('Blob {} stat has changed, has someone modified it? {} (attempt {} / {})'.format(
+					src_path_str, 'No more retry' if is_last_attempt else 'Retrying', retry_cnt, _BLOB_FILE_CHANGED_RETRY_COUNT
+				))
 				st = src_path.lstat()
 			except Exception as e:
 				self.logger.error('Create blob for file {} failed (attempt {} / {}): {}'.format(src_path_str, e, retry_cnt, _BLOB_FILE_CHANGED_RETRY_COUNT))