def _addpullheader(seq, ctx):
    """Add a header pointing to a public URL where the changeset is available
    """
    repo = ctx.repo()
    publicurl = repo.ui.config(b'patchbomb', b'publicurl')
    if publicurl:
        return b'Available At %s\n#              hg pull %s -r %s' % (publicurl
            , publicurl, ctx)
    return None
