def get_rev_log(master, revno):
    rqst = log.make_log_request_dict(start_revision=revno, limit=1, delta_type='full')
    log_format = log.log_formatter_registry.get_default(master)
    buf = StringIO()
    lf = log_format(show_ids=False, to_file=buf,
                    show_timezone='local',
                    delta_format=None,
                    levels=None,
                    show_advice=True)
    log.Logger(master, rqst).show(lf)
    buf_str = buf.getvalue()
    return buf_str[buf_str.find('\n') + 1:].strip()

def get_rev_diff(repository, rev, old_revid, new_revid):
    if old_revid == revision.NULL_REVISION:
        tree_new = repository.revision_tree(new_revid)
        tree_old = repository.revision_tree(old_revid)
    else:
        tree_new, tree_old = repository.revision_trees((new_revid, old_revid))

    diff_content = StringIO()
    show_diff_trees(tree_old, tree_new, diff_content)
    return diff_content.getvalue()

def post_commit(local, master, old_revno, old_revid, new_revno, new_revid):
    repository = master.repository
    if local is not None and local.repository.has_revision(new_revid):
        repository = local.repository
    rev = repository.get_revision(new_revid)

    for bug_url, status in rev.iter_bugs():
        if bug_url.startswith('<removed>'):
            diag_msg = get_rev_log(master, new_revno)
            src_change = get_rev_diff(repository, rev, old_revid, new_revid)