diff -r 2372284d9457 -r 687b865b95ad hgext/lfs/pointer.py
--- a/hgext/lfs/pointer.py	Sun Oct 06 09:45:02 2019 -0400
+++ b/hgext/lfs/pointer.py	Sun Oct 06 09:48:39 2019 -0400
@@ -23,41 +23,41 @@
 
 
 class gitlfspointer(dict):
-    VERSION = 'https://git-lfs.github.com/spec/v1'
+    VERSION = b'https://git-lfs.github.com/spec/v1'
 
     def __init__(self, *args, **kwargs):
-        self['version'] = self.VERSION
+        self[b'version'] = self.VERSION
         super(gitlfspointer, self).__init__(*args)
         self.update(pycompat.byteskwargs(kwargs))
 
     @classmethod
     def deserialize(cls, text):
         try:
-            return cls(l.split(' ', 1) for l in text.splitlines()).validate()
+            return cls(l.split(b' ', 1) for l in text.splitlines()).validate()
         except ValueError:  # l.split returns 1 item instead of 2
             raise InvalidPointer(
-                _('cannot parse git-lfs text: %s') % stringutil.pprint(text)
+                _(b'cannot parse git-lfs text: %s') % stringutil.pprint(text)
             )
 
     def serialize(self):
-        sortkeyfunc = lambda x: (x[0] != 'version', x)
+        sortkeyfunc = lambda x: (x[0] != b'version', x)
         items = sorted(self.validate().iteritems(), key=sortkeyfunc)
-        return ''.join('%s %s\n' % (k, v) for k, v in items)
+        return b''.join(b'%s %s\n' % (k, v) for k, v in items)
 
     def oid(self):
-        return self['oid'].split(':')[-1]
+        return self[b'oid'].split(b':')[-1]
 
     def size(self):
-        return int(self['size'])
+        return int(self[b'size'])
 
     # regular expressions used by _validate
     # see https://github.com/git-lfs/git-lfs/blob/master/docs/spec.md
     _keyre = re.compile(br'\A[a-z0-9.-]+\Z')
     _valuere = re.compile(br'\A[^\n]*\Z')
     _requiredre = {
-        'size': re.compile(br'\A[0-9]+\Z'),
-        'oid': re.compile(br'\Asha256:[0-9a-f]{64}\Z'),
-        'version': re.compile(br'\A%s\Z' % stringutil.reescape(VERSION)),
+        b'size': re.compile(br'\A[0-9]+\Z'),
+        b'oid': re.compile(br'\Asha256:[0-9a-f]{64}\Z'),
+        b'version': re.compile(br'\A%s\Z' % stringutil.reescape(VERSION)),
     }
 
     def validate(self):
@@ -67,21 +67,21 @@
             if k in self._requiredre:
                 if not self._requiredre[k].match(v):
                     raise InvalidPointer(
-                        _('unexpected lfs pointer value: %s=%s')
+                        _(b'unexpected lfs pointer value: %s=%s')
                         % (k, stringutil.pprint(v))
                     )
                 requiredcount += 1
             elif not self._keyre.match(k):
-                raise InvalidPointer(_('unexpected lfs pointer key: %s') % k)
+                raise InvalidPointer(_(b'unexpected lfs pointer key: %s') % k)
             if not self._valuere.match(v):
                 raise InvalidPointer(
-                    _('unexpected lfs pointer value: %s=%s')
+                    _(b'unexpected lfs pointer value: %s=%s')
                     % (k, stringutil.pprint(v))
                 )
         if len(self._requiredre) != requiredcount:
             miss = sorted(set(self._requiredre.keys()).difference(self.keys()))
             raise InvalidPointer(
-                _('missing lfs pointer keys: %s') % ', '.join(miss)
+                _(b'missing lfs pointer keys: %s') % b', '.join(miss)
             )
         return self