lfs: move hg filelog metadata calculation to a separate method

Summary: The method will be reused by remotefilelog.

Reviewed By: DurhamG

Differential Revision: D6906205

fbshipit-source-id: 5e36a5c7f40c7e226e6dd18e102e433632b1005d

hgext/lfs/pointer.py

@@ -43,6 +43,15 @@ class gitlfspointer(dict):
     def size(self):
         return int(self['size'])
 
+    def hgmeta(self):
+        """Translate LFS metadata to hg filelog metadata dictionary"""
+        hgmeta = {}
+        for k, v in self.iteritems():
+            if k.startswith('x-hg-'):
+                name = k[len('x-hg-'):]
+                hgmeta[name] = v
+        return hgmeta
+
     # regular expressions used by _validate
     # see https://github.com/git-lfs/git-lfs/blob/master/docs/spec.md
     _keyre = re.compile(r'\A[a-z0-9.-]+\Z')

hgext/lfs/wrapper.py

@@ -55,11 +55,7 @@ def readfromstore(self, text):
     text = store.read(oid)
 
     # pack hg filelog metadata
-    hgmeta = {}
-    for k in p.keys():
-        if k.startswith('x-hg-'):
-            name = k[len('x-hg-'):]
-            hgmeta[name] = p[k]
+    hgmeta = p.hgmeta()
     if hgmeta or text.startswith('\1\n'):
         text = filelog.packmeta(hgmeta, text)