diff --git a/kallithea/lib/vcs/backends/hg/changeset.py b/kallithea/lib/vcs/backends/hg/changeset.py
--- a/kallithea/lib/vcs/backends/hg/changeset.py
+++ b/kallithea/lib/vcs/backends/hg/changeset.py
@@ -16,6 +16,7 @@ from kallithea.lib.vcs.utils.lazy import
 from kallithea.lib.vcs.utils.paths import get_dirs_for_path
 from kallithea.lib.vcs.utils.hgcompat import archival, hex
 
+from mercurial import obsolete
 
 class MercurialChangeset(BaseChangeset):
     """
@@ -43,6 +44,30 @@ class MercurialChangeset(BaseChangeset):
         return  self._ctx.closesbranch()
 
     @LazyProperty
+    def obsolete(self):
+        return  self._ctx.obsolete()
+
+    @LazyProperty
+    def successors(self):
+        successors = obsolete.successorssets(self._ctx._repo, self._ctx.node())
+        if successors:
+            # flatten the list here handles both divergent (len > 1)
+            # and the usual case (len = 1)
+            successors = [hex(n)[:12] for sub in successors for n in sub if n != self._ctx.node()]
+
+        return successors
+
+    @LazyProperty
+    def precursors(self):
+        precursors = set()
+        nm = self._ctx._repo.changelog.nodemap
+        for p in self._ctx._repo.obsstore.precursors.get(self._ctx.node(), ()):
+            pr = nm.get(p[0])
+            if pr is not None:
+                precursors.add(hex(p[0])[:12])
+        return precursors
+
+    @LazyProperty
     def bookmarks(self):
         return map(safe_unicode, self._ctx.bookmarks())
 
@@ -284,13 +309,6 @@ class MercurialChangeset(BaseChangeset):
         archival.archive(self.repository._repo, stream, self.raw_id,
                          kind, prefix=prefix, subrepos=subrepos)
 
-        if stream.closed and hasattr(stream, 'name'):
-            stream = open(stream.name, 'rb')
-        elif hasattr(stream, 'mode') and 'r' not in stream.mode:
-            stream = open(stream.name, 'rb')
-        else:
-            stream.seek(0)
-
     def get_nodes(self, path):
         """
         Returns combined ``DirNode`` and ``FileNode`` objects list representing