def release_local(url, version='patch', base='master', integration=None, default_version='0.0.1', use_prefix=None):
    # type: (str, str, str, str, str, str) -> str
    """
    Tag given repository with a new semver tag (bump version),
    optionally merging a integration branch.

    This will:
        - clone the repository to temporary directory
        - checkout branch indicated via base argument
        - retrieve all the tags, sort them in natural order
        - retrieve the last tag and bump it to given version
        - merge integration branch, if defined
        - tag and push base branch back to origin

    If no tag is present and version argument is any of the bump arguments,
    default_version will be used

    :rtype: str
    :param url: URL of the repository
    :param version: specific version or one of: build, prerelease, patch, minor, major
    :param base: base branch to use, by default master
    :param integration: integration branch to use, by default none
    :param default_version: default version used for when there are no tags and no specific version, default 0.0.1
    :param use_prefix: use prefix for tags - sometimes, 'v',
    :return: newly released version string or None if can not tag
    """
    workspace = mkdtemp()
    repo = Repo.clone_from(url, workspace, progress=SimpleProgressPrinter())

    if repo.bare:
        print_err('Cloned a bare repository, can not release [???]')

    origin = repo.remote('origin')

    if repo.active_branch.name != base:
        origin.fetch('refs/heads/{0}:refs/heads/{0}'.format(base), progress=SimpleProgressPrinter())
        repo.heads[base].checkout()

    if integration is not None and integration in repo.heads:
        print_info('Found integration branch "{0}", fetching'.format(integration))
        origin.fetch('refs/heads/{0}:refs/heads/{0}'.format(integration), progress=SimpleProgressPrinter())
        print_info('Will now attempt fast-forward {0} to include {1}'.format(base, integration))
        print_git_output(repo.git.merge('--commit', '--no-edit', '--stat', '--ff-only', '-v', integration))

    head_tags = (tag for tag in repo.tags if tag.commit == repo.head.commit)
    sorted_head_tags = natsorted(head_tags, key=lambda t: t.path)

    if 0 != len(sorted_head_tags):
        print_info(
            'Not going to auto-tag already tagged HEAD, tagged with {0}'
                .format(
                str.join(', ', (t.path[10:] for t in sorted_head_tags))
            )
        )
        return None

    last_tag = None

    if repo.tags:
        sorted_tags = natsorted(repo.tags, key=lambda t: t.path)
        current_tag = sorted_tags[-1].path[10:]
        print_info('Current tag is {0}'.format(current_tag))
        if use_prefix is not None and current_tag.startswith(use_prefix):
            last_tag = current_tag[len(use_prefix):]
        else:
            last_tag = current_tag

    print_info('Last known version: {0}'.format(last_tag))

    if last_tag is None:
        print('Unknown last version, using default version {0}'.format(default_version))
        last_tag = default_version

    if 'build' == version:
        next_version = bump_build(last_tag)

    elif 'prerelease' == version:
        next_version = bump_prerelease(last_tag)

    elif 'patch' == version:
        next_version = bump_patch(last_tag)

    elif 'minor' == version:
        next_version = bump_minor(last_tag)

    elif 'major' == version:
        next_version = bump_major(last_tag)
    else:
        next_version = version

    print_info('Next version: {0}'.format(next_version))

    next_tag = next_version.strip()

    if use_prefix is not None:
        next_tag = use_prefix + next_version

    print_info('Next tag: {0}'.format(next_tag))

    print_info('Tagging and pushing version')

    release_tag = repo.create_tag(
        path=next_tag,
        ref=repo.heads[base],
        message='Release tag of {0}'.format(next_version)
    )

    origin.push([release_tag, repo.heads[base]], progress=SimpleProgressPrinter())

    print_info('Done, clearing workspace')
    rmtree(workspace)

    return next_version