@task
def setup_server(*roles):
    """Install packages and add configurations for server given roles."""
    require('environment')
    # Set server locale
    sudo('/usr/sbin/update-locale LANG=en_US.UTF-8')
    roles = list(roles)
    if roles == ['all', ]:
        roles = SERVER_ROLES
    if 'base' not in roles:
        roles.insert(0, 'base')
    install_packages(*roles)
    if 'db' in roles:
        if console.confirm(u"Do you want to reset the Postgres cluster?.", default=False):
            # Ensure the cluster is using UTF-8
            pg_version = postgres.detect_version()
            sudo('pg_dropcluster --stop %s main' % pg_version, user='postgres')
            sudo('pg_createcluster --start -e UTF-8 --locale en_US.UTF-8 %s main' % pg_version,
                 user='postgres')
        postgres.create_db_user(username=env.project_user)
        postgres.create_db(name=env.db, owner=env.project_user)
    if 'app' in roles:
        # Create project directories and install Python requirements
        project_run('mkdir -p %(root)s' % env)
        project_run('mkdir -p %(log_dir)s' % env)
        # FIXME: update to SSH as normal user and use sudo
        # we ssh as the project_user here to maintain ssh agent
        # forwarding, because it doesn't work with sudo. read:
        # http://serverfault.com/questions/107187/sudo-su-username-while-keeping-ssh-key-forwarding
        with settings(user=env.project_user):
            # TODO: Add known hosts prior to clone.
            # i.e. ssh -o StrictHostKeyChecking=no git@github.com
            run('git clone %(repo)s %(code_root)s' % env)
            with cd(env.code_root):
                run('git checkout %(branch)s' % env)
        # Install and create virtualenv
        with settings(hide('everything'), warn_only=True):
            test_for_pip = run('which pip')
        if not test_for_pip:
            sudo("easy_install -U pip")
        with settings(hide('everything'), warn_only=True):
            test_for_virtualenv = run('which virtualenv')
        if not test_for_virtualenv:
            sudo("pip install -U virtualenv")
        project_run('virtualenv -p python2.7 --clear --distribute %s' % env.virtualenv_root)
        path_file = os.path.join(env.virtualenv_root, 'lib', 'python2.7', 'site-packages', 'project.pth')
        files.append(path_file, env.code_root, use_sudo=True)
        sudo((env.project_user, env.project_user, path_file) % 'chown %s:%s %s')
        sudo('npm install less@1.3 -g')
        update_requirements()
        upload_supervisor_app_conf(app_name=u'gunicorn')
        upload_supervisor_app_conf(app_name=u'group')
        # Restart services to pickup changes
        supervisor_command('reload')
        supervisor_command('restart %(environment)s:*' % env)
    if 'lb' in roles:
        nginx.remove_default_site()
        nginx.upload_nginx_site_conf(site_name=u'%(project)s-%(environment)s.conf' % env)
dataset/ETHPy150Open python/raspberryio/fabfile.py/setup_server/swapped operands of `%`