ubuntu.py 文件源码

def _add_cloud_pocket(pocket):
    """Add a cloud pocket as /etc/apt/sources.d/cloud-archive.list

    Note that this overwrites the existing file if there is one.

    This function also converts the simple pocket in to the actual pocket using
    the CLOUD_ARCHIVE_POCKETS mapping.

    :param pocket: string representing the pocket to add a deb spec for.
    :raises: SourceConfigError if the cloud pocket doesn't exist or the
        requested release doesn't match the current distro version.
    """
    apt_install(filter_installed_packages(['ubuntu-cloud-keyring']),
                fatal=True)
    if pocket not in CLOUD_ARCHIVE_POCKETS:
        raise SourceConfigError(
            'Unsupported cloud: source option %s' %
            pocket)
    actual_pocket = CLOUD_ARCHIVE_POCKETS[pocket]
    with open('/etc/apt/sources.list.d/cloud-archive.list', 'w') as apt:
        apt.write(CLOUD_ARCHIVE.format(actual_pocket))