109.snapshot testing.2

newsfragments/109.feature

@@ -0,0 +1 @@
+initial implementation of a snapshot represented as a Tahoe-LAFS immutable directory

src/magic_folder/common.py

@@ -90,12 +90,19 @@ def bad_response(url, response):
     body = yield readBody(response)
     raise BadResponseCode(url, response.code, body)
 
+
 def get_node_url(node_directory):
-    node_url_file = os.path.join(node_directory, u"node.url")
-    node_url = fileutil.read(node_url_file).strip()
+    """
+    :param str node_directory: A Tahoe client directory
 
+    :returns: the base URL for the Tahoe given client.
+    """
+    node_url_file = os.path.join(node_directory, u"node.url")
+    with open(node_url_file, "r") as f:
+        node_url = f.read().strip()
     return node_url
 
+
 @inlineCallbacks
 def tahoe_mkdir(nodeurl, treq):
     """