Add flush_client method and fix RepositoryClientNotLocked instance

This may be used to force any in-memory caches for an open client in a
repository to be written out, and then dropped, to reduct memory use.
Only green-albatross implements this, for now.

1 files changed, 8 insertions, 0 deletions

diff --git a/obnamlib/repo_interface.py b/obnamlib/repo_interface.py
index b3744de5..f948c68e 100644
--- a/obnamlib/repo_interface.py
+++ b/obnamlib/repo_interface.py
@@ -543,6 +543,14 @@ class RepositoryInterface(object):
         '''
         raise NotImplementedError()
 
+    def flush_client(self, client_name):
+        '''Flush cached data from client. This is not a commit.
+
+        This is a NOP, unless the a specific repository format gives
+        it meaning.
+
+        '''
+
     def commit_client(self, client_name):
         '''Commit changes to client and DO NOT unlock it.