Add script to map DNS

This script needs:
- a list of domains managed by GANDI LiveDNS
- a list of IP addresses of clusters (like in tags/*/ips.txt)

It will replace the current configuration for these
domains so that they point to the clusters.

The apex of each domain and a wildcard entry will
have round-robin records pointing to all the nodes
of the cluster.

In addition, there will be records node[1234...]
pointing to each individual node.

prepare-vms/map-dns.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+import os
+import requests
+import yaml
+
+# configurable stuff
+domains_file = "../../plentydomains/domains.txt"
+config_file = os.path.join(
+	os.environ["HOME"], ".config/gandi/config.yaml")
+tag = "test"
+apiurl = "https://dns.api.gandi.net/api/v5/domains"
+
+# inferred stuff
+domains = open(domains_file).read().split()
+apikey = yaml.safe_load(open(config_file))["apirest"]["key"]
+ips = open(f"tags/{tag}/ips.txt").read().split()
+settings_file = f"tags/{tag}/settings.yaml"
+clustersize = yaml.safe_load(open(settings_file))["clustersize"]
+
+# now do the fucking work
+while domains and ips:
+	domain = domains[0]
+	domains = domains[1:]
+	cluster = ips[:clustersize]
+	ips = ips[clustersize:]
+	print(f"{domain} => {cluster}")
+	zone = ""
+	node = 0
+	for ip in cluster:
+		node += 1
+		zone += f"@ 300 IN A {ip}\n"
+		zone += f"* 300 IN A {ip}\n"
+		zone += f"node{node} 300 IN A {ip}\n"
+	r = requests.put(
+		f"{apiurl}/{domain}/records",
+		headers={"x-api-key": apikey},
+		data=zone)
+	print(r.text)
+
+	#r = requests.get(
+	#	f"{apiurl}/{domain}/records",
+	#	headers={"x-api-key": apikey},
+	#	)
+
+if domains:
+	print(f"Good, we have {len(domains)} domains left.")
+
+if ips:
+	print(f"Crap, we have {len(ips)} IP addresses left.")