Deprecate dns settings api and add dns data migration

src/platform.js

@@ -12,7 +12,10 @@ var apps = require('./apps.js'),
     async = require('async'),
     config = require('./config.js'),
     certificates = require('./certificates.js'),
+    DatabaseError = require('./databaseerror.js'),
     debug = require('debug')('box:platform'),
+    domains = require('./domains.js'),
+    DomainError = domains.DomainError,
     fs = require('fs'),
     hat = require('hat'),
     infra = require('./infra_version.js'),
@@ -22,6 +25,7 @@ var apps = require('./apps.js'),
     safe = require('safetydance'),
     semver = require('semver'),
     settings = require('./settings.js'),
+    settingsdb = require('./settingsdb.js'),
     shell = require('./shell.js'),
     subdomains = require('./subdomains.js'),
     taskmanager = require('./taskmanager.js'),
@@ -64,6 +68,7 @@ function start(callback) {
     debug('Updating infrastructure from %s to %s', existingInfra.version, infra.version);
 
     async.series([
+        migrateDNSSettings,
         stopContainers.bind(null, existingInfra),
         startAddons.bind(null, existingInfra),
         removeOldImages,
@@ -377,3 +382,24 @@ function startApps(existingInfra, callback) {
         apps.configureInstalledApps(callback);
     }
 }
+
+// This is only used when updating from single to multi domain support
+// REMOVE later!
+function migrateDNSSettings(callback) {
+    assert.strictEqual(typeof callback, 'function');
+
+    settingsdb.get('dns_config', function (error, result) {
+        if (error && error.reason !== DatabaseError.NOT_FOUND) return callback(error);
+
+        const dnsConfig = result ? safe.JSON.parse(result) : { provider: 'manual' };
+
+        domains.get(config.fqdn(), function (error, result) {
+            if (error && error.reason !== DomainError.NOT_FOUND) return callback(error);
+
+            // if domain is already in the table, nothing to do
+            if (result) return callback(null);
+
+            domains.add(config.fqdn(), config.zoneName(), dnsConfig, callback);
+        });
+    });
+}