build-etc-hosts-drake.py
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	#!/usr/bin/env python3

	# -------------------------------------------------------------
	# NetBox — Build /etc/hosts for Drake private network
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# License: BSD-2-Clause
	# Description: This script queries NetBox to get IP and FQDN
	# Dependencies: PyYAML, pynetbox
	# -------------------------------------------------------------


	import logging
	import os

	import pynetbox
	import yaml


	VRF_RD_DRAKE = "nasqueron.drake"


	# -------------------------------------------------------------
	# Get NetBox config and credentials
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def get_netbox_config_from_salt():
	config_path = "/usr/local/etc/salt/master.d/netbox.conf"

	if not os.path.exists(config_path):
	return False, None

	with open(config_path) as fd:
	salt_config = yaml.safe_load(fd)
	salt_config = salt_config["ext_pillar"][0]["netbox"]
	return True, {
	"server": salt_config["api_url"].replace("/api/", ""),
	"token": salt_config["api_token"],
	}


	def get_netbox_config_from_config_dir():
	try:
	config_path = os.path.join(os.environ["HOME"], ".config", "netbox", "auth.yaml")
	except KeyError:
	return False, None

	if not os.path.exists(config_path):
	return False, None

	with open(config_path) as fd:
	return True, yaml.safe_load(fd)


	def get_netbox_config():
	methods = [get_netbox_config_from_salt, get_netbox_config_from_config_dir]

	for method in methods:
	has_config, config = method()
	if has_config:
	return config

	raise RuntimeError("Can't find NetBox config")


	# -------------------------------------------------------------
	# Service container
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def init_app():
	"""Prepare a service container for the application."""
	config = get_netbox_config()

	return {
	"config": config,
	"netbox": connect_to_netbox(config),
	}


	def connect_to_netbox(config):
	return pynetbox.api(config["server"], token=config["token"])


	# -------------------------------------------------------------
	# Build /etc/hosts
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def build_etc_hosts(nb):
	ip_addresses = nb.ipam.ip_addresses.filter(vrf=VRF_RD_DRAKE)
	for ip in ip_addresses:
	if len(ip.dns_name) == 0:
	continue

	if ip.status.value not in ["active", "deprecated"]:
	continue

	address = clean_ip(ip.address)
	short = get_short_dns_name(ip.dns_name)
	print(f"{address} {short} {ip.dns_name}")


	# -------------------------------------------------------------
	# Helper functions to use NetBox API
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def clean_ip(ip):
	pos = ip.find("/")
	return ip[0:pos]


	def get_short_dns_name(hostname):
	pos = hostname.find(".")
	return hostname[0:pos]


	# -------------------------------------------------------------
	# Application entry-point
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def run_build_etc_hosts():
	app = init_app()
	build_etc_hosts(app["netbox"])


	if __name__ == "__main__":
	LOGLEVEL = os.environ.get("LOGLEVEL", "WARNING").upper()
	logging.basicConfig(level=LOGLEVEL)

	run_build_etc_hosts()

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