remotefilelog: refactor mutablepack close/abort

Summary:
This makes mutablepacks close and abort function accessible from outside the
__exit__ logic. This will be useful later when we tie the lifetime of a
mutablepack to a transaction.

Test Plan: Ran the tests

Reviewers: #mercurial, quark

Reviewed By: quark

Subscribers: mjpieters

Differential Revision: https://phabricator.intern.facebook.com/D4055730

Signature: t1:4055730:1477059602:ffdfd66e65279ddf3ff43d7c2ee65b00f1fd2600

remotefilelog/basepack.py

@@ -231,9 +231,11 @@ class mutablebasepack(object):
 
     def __exit__(self, exc_type, exc_value, traceback):
         if exc_type is None:
-            if not self._closed:
             self.close()
         else:
+            self.abort()
+
+    def abort(self):
         # Unclean exit
         try:
             self.opener.unlink(self.packpath)
@@ -246,6 +248,9 @@ class mutablebasepack(object):
         self.sha.update(data)
 
     def close(self, ledger=None):
+        if self._closed:
+            return
+
         sha = self.sha.hexdigest()
         self.packfp.close()
         self.writeindex()

remotefilelog/historypack.py

@@ -354,6 +354,9 @@ class mutablehistorypack(basepack.mutablebasepack):
         self.entries[node] = node
 
     def close(self, ledger=None):
+        if self._closed:
+            return
+
         if self.currentfile:
             self._writependingsection()