333     if pushop.ret:

   334         # push succeed, synchronize target of the push

   335         cheads = pushop.outgoing.missingheads

   336     elif pushop.revs is None:

   337         # All out push fails. synchronize all common

   338         cheads = pushop.outgoing.commonheads

   339     else:

   340         # I want cheads = heads(::missingheads and ::commonheads)

   341         # (missingheads is revs with secret changeset filtered out)

   342         #

   343         # This can be expressed as:

   344         #     cheads = ( (missingheads and ::commonheads)

   345         #              + (commonheads and ::missingheads))"

   346         #              )

   347         #

   348         # while trying to push we already computed the following:

   349         #     common = (::commonheads)

   350         #     missing = ((commonheads::missingheads) - commonheads)

   351         #

   352         # We can pick:

   353         # * missingheads part of common (::commonheads)

   354         common = set(pushop.outgoing.common)

   355         nm = pushop.repo.changelog.nodemap

   356         cheads = [node for node in pushop.revs if nm[node] in common]

   357         # and

   358         # * commonheads parents on missing

   359         revset = unfi.set('%ln and parents(roots(%ln))',

   360                          pushop.outgoing.commonheads,

   361                          pushop.outgoing.missing)

   362         cheads.extend(c.node() for c in revset)

   363     pushop.commonheads = cheads