diff --git a/IPython/html/services/notebooks/filenbmanager.py b/IPython/html/services/notebooks/filenbmanager.py
index e87a2cc..992e9d3 100644
--- a/IPython/html/services/notebooks/filenbmanager.py
+++ b/IPython/html/services/notebooks/filenbmanager.py
@@ -222,6 +222,10 @@ class FileNotebookManager(NotebookManager):
if 'content' not in model:
raise web.HTTPError(400, u'No notebook JSON data provided')
+
+ # One checkpoint should always exist
+ if self.notebook_exists(name, path) and not self.list_checkpoints(name, path):
+ self.create_checkpoint(name, path)
new_path = model.get('path', path).strip('/')
new_name = model.get('name', name)
@@ -326,8 +330,9 @@ class FileNotebookManager(NotebookManager):
def get_checkpoint_path(self, checkpoint_id, name, path=''):
"""find the path to a checkpoint"""
path = path.strip('/')
+ basename, _ = os.path.splitext(name)
filename = u"{name}-{checkpoint_id}{ext}".format(
- name=name,
+ name=basename,
checkpoint_id=checkpoint_id,
ext=self.filename_ext,
)
diff --git a/IPython/html/services/notebooks/nbmanager.py b/IPython/html/services/notebooks/nbmanager.py
index 568c6a5..c9d5459 100644
--- a/IPython/html/services/notebooks/nbmanager.py
+++ b/IPython/html/services/notebooks/nbmanager.py
@@ -117,7 +117,7 @@ class NotebookManager(LoggingConfigurable):
raise NotImplementedError('must be implemented in a subclass')
def create_notebook_model(self, model=None, path=''):
- """Create a new untitled notebook and return its model with no content."""
+ """Create a new notebook and return its model with no content."""
path = path.strip('/')
if model is None:
model = {}