Add remove_unused_chunks method

1 files changed, 9 insertions, 0 deletions

diff --git a/obnamlib/repo_interface.py b/obnamlib/repo_interface.py
index 515c29da..4cb05d44 100644
--- a/obnamlib/repo_interface.py
+++ b/obnamlib/repo_interface.py
@@ -740,6 +740,15 @@ class RepositoryInterface(object):
         '''Write any pending new chunks to repository.'''
         raise NotImplementedError()
 
+    def remove_unused_chunk(self):
+        '''Remove chunks that are no longer used by any client.
+
+        The caller MUST commit any changes to clients or chunk indexes
+        before calling this method.
+
+        '''
+        raise NotImplementedError()
+
     def lock_chunk_indexes(self):
         '''Locks chunk indexes for updates.'''
         raise NotImplementedError()