Debug logs for atomic file modifications

Author: Ladme

src/qq_lib/batch/interface/_arfe.py

@@ -14,6 +14,9 @@
 
 from qq_lib.core.config import CFG
 from qq_lib.core.error import QQError
+from qq_lib.core.logger import get_logger
+
+logger = get_logger(__name__)
 
 
 class _AtomicRemoteFileEditor:
@@ -44,6 +47,9 @@ def modify(self, modify_fn: Callable[[str], str]) -> None:
         Raises:
             QQError: If the SSH connection, lock acquisition, or write-back fails.
         """
+        logger.debug(
+            f"Atomically modifying remote file '{self._file}' on host '{self._host}'."
+        )
         script = self._build_script()
         proc = self._start_ssh(script)
 

src/qq_lib/batch/pbs/pbs.py

@@ -1123,6 +1123,7 @@ def _modify_local_file_with_lock(
         timeout = CFG.timeouts.flock
         deadline = time.monotonic() + timeout
 
+        logger.debug(f"Atomically modifying local file '{file}'.")
         with lockfile.open("w") as fd:
             while True:
                 try:
@@ -1131,7 +1132,7 @@ def _modify_local_file_with_lock(
                 except OSError:
                     if time.monotonic() >= deadline:
                         raise QQError(
-                            f"Could not acquire lock on {file} within {timeout} seconds."
+                            f"Could not acquire lock on '{file}' within {timeout} seconds."
                         )
                     time.sleep(0.1)