fix dealing with remote repo Locking Exceptions

previously, this was handled in RPCError handler and always resulted in rc 2.

now re-raise Lock Exceptions locally, so it gives rc 2 (legacy) or 7x (modern).

src/borg/archiver/__init__.py

@@ -644,7 +644,7 @@ def main():  # pragma: no cover
             tb = format_tb(e)
             exit_code = e.exit_code
         except RemoteRepository.RPCError as e:
-            important = e.exception_class not in ("LockTimeout",) and e.traceback
+            important = e.traceback
             msg = e.exception_full if important else e.get_message()
             msgid = e.exception_class
             tb_log_level = logging.ERROR if important else logging.DEBUG

src/borg/remote.py

@@ -30,6 +30,7 @@ from .helpers import format_file_size
 from .helpers import safe_unlink
 from .helpers import prepare_subprocess_env, ignore_sigint
 from .helpers import get_socket_filename
+from .locking import LockTimeout, NotLocked, NotMyLock, LockFailed
 from .logger import create_logger, borg_serve_log_queue
 from .helpers import msgpack
 from .repository import Repository
@@ -781,6 +782,14 @@ class RemoteRepository:
                 raise Repository.ObjectNotFound(args[0], self.location.processed)
             elif error == "InvalidRPCMethod":
                 raise InvalidRPCMethod(args[0])
+            elif error == "LockTimeout":
+                raise LockTimeout(args[0])
+            elif error == "LockFailed":
+                raise LockFailed(args[0], args[1])
+            elif error == "NotLocked":
+                raise NotLocked(args[0])
+            elif error == "NotMyLock":
+                raise NotMyLock(args[0])
             else:
                 raise self.RPCError(unpacked)