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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def enforce_versioning(force=False):
 """Install versioning on the db."""

    connect_str, repo_url = get_version_data()
    LOG.warning("Your database uses an unversioned benchbuild schema.")
    if not force and not ui.ask(
            "Should I enforce version control on your schema?"):
        LOG.error("User declined schema versioning.")
        return None
    repo_version = migrate.version(repo_url, url=connect_str)
    migrate.version_control(connect_str, repo_url, version=repo_version)
    return repo_version