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Filename : net_convert.py
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#!/usr/bin/env python3
# This file is part of cloud-init. See LICENSE file for license information.

"""Debug network config format conversions."""
import argparse
import json
import logging
import os
import sys

import yaml

from cloudinit import distros, safeyaml
from cloudinit.log import loggers
from cloudinit.net import (
    eni,
    netplan,
    network_manager,
    network_state,
    networkd,
    sysconfig,
)
from cloudinit.sources import DataSourceAzure as azure
from cloudinit.sources.helpers import openstack
from cloudinit.sources.helpers.vmware.imc import guestcust_util

NAME = "net-convert"


def get_parser(parser=None):
    """Build or extend and arg parser for net-convert utility.

    @param parser: Optional existing ArgumentParser instance representing the
        subcommand which will be extended to support the args of this utility.

    @returns: ArgumentParser with proper argument configuration.
    """
    if not parser:
        parser = argparse.ArgumentParser(prog=NAME, description=__doc__)
    parser.add_argument(
        "-p",
        "--network-data",
        type=open,
        metavar="PATH",
        required=True,
        help="The network configuration to read",
    )
    parser.add_argument(
        "-k",
        "--kind",
        choices=[
            "eni",
            "network_data.json",
            "yaml",
            "azure-imds",
            "vmware-imc",
        ],
        required=True,
        help="The format of the given network config",
    )
    parser.add_argument(
        "-d",
        "--directory",
        metavar="PATH",
        help="directory to place output in",
        required=True,
    )
    parser.add_argument(
        "-D",
        "--distro",
        choices=[
            item for sublist in distros.OSFAMILIES.values() for item in sublist
        ],
        required=True,
    )
    parser.add_argument(
        "-m",
        "--mac",
        metavar="name,mac",
        action="append",
        help="interface name to mac mapping",
    )
    parser.add_argument(
        "--debug", action="store_true", help="enable debug logging to stderr."
    )
    parser.add_argument(
        "-O",
        "--output-kind",
        choices=["eni", "netplan", "networkd", "sysconfig", "network-manager"],
        required=True,
        help="The network config format to emit",
    )
    return parser


def handle_args(name, args):
    if not args.directory.endswith("/"):
        args.directory += "/"

    if not os.path.isdir(args.directory):
        os.makedirs(args.directory)

    if args.debug:
        loggers.setup_basic_logging(level=logging.DEBUG)
    else:
        loggers.setup_basic_logging(level=logging.WARN)
    if args.mac:
        known_macs = {}
        for item in args.mac:
            iface_name, iface_mac = item.split(",", 1)
            known_macs[iface_mac] = iface_name
    else:
        known_macs = None

    net_data = args.network_data.read()
    if args.kind == "eni":
        pre_ns = eni.convert_eni_data(net_data)
    elif args.kind == "yaml":
        pre_ns = yaml.safe_load(net_data)
        if "network" in pre_ns:
            pre_ns = pre_ns.get("network")
        if args.debug:
            sys.stderr.write(
                "\n".join(["Input YAML", safeyaml.dumps(pre_ns), ""])
            )
    elif args.kind == "network_data.json":
        pre_ns = openstack.convert_net_json(
            json.loads(net_data), known_macs=known_macs
        )
    elif args.kind == "azure-imds":
        pre_ns = azure.generate_network_config_from_instance_network_metadata(
            json.loads(net_data)["network"],
            apply_network_config_for_secondary_ips=True,
        )
    elif args.kind == "vmware-imc":
        config = guestcust_util.Config(
            guestcust_util.ConfigFile(args.network_data.name)
        )
        pre_ns = guestcust_util.get_network_data_from_vmware_cust_cfg(
            config, False
        )

    distro_cls = distros.fetch(args.distro)
    distro = distro_cls(args.distro, {}, None)
    if args.output_kind == "eni":
        r_cls = eni.Renderer
        config = distro.renderer_configs.get("eni")
    elif args.output_kind == "netplan":
        r_cls = netplan.Renderer
        config = distro.renderer_configs.get("netplan", {})
        # don't run netplan generate/apply
        config["postcmds"] = False
        # trim leading slash
        config["netplan_path"] = config["netplan_path"][1:]
        # enable some netplan features
        config["features"] = ["dhcp-use-domains", "ipv6-mtu"]
    elif args.output_kind == "networkd":
        r_cls = networkd.Renderer
        config = distro.renderer_configs.get("networkd")
    elif args.output_kind == "sysconfig":
        r_cls = sysconfig.Renderer
        config = distro.renderer_configs.get("sysconfig")
    elif args.output_kind == "network-manager":
        r_cls = network_manager.Renderer
        config = distro.renderer_configs.get("network-manager")
    else:
        raise RuntimeError("Invalid output_kind")

    r = r_cls(config=config)
    ns = network_state.parse_net_config_data(pre_ns, renderer=r)

    if args.debug:
        sys.stderr.write("\n".join(["", "Internal State", yaml.dump(ns), ""]))

    sys.stderr.write(
        "".join(
            [
                "Read input format '%s' from '%s'.\n"
                % (args.kind, args.network_data.name),
                "Wrote output format '%s' to '%s'\n"
                % (args.output_kind, args.directory),
            ]
        )
        + "\n"
    )
    r.render_network_state(network_state=ns, target=args.directory)


if __name__ == "__main__":
    args = get_parser().parse_args()
    handle_args(NAME, args)