Merge pull request NixOS#482 from lo1tuma/route53-env-vars-fix

Fallback to EC2/AWS env variable if access key id is not defined

Author: edolstra

Diff for: nixops/backends/ec2.py

@@ -1130,7 +1130,7 @@ def _update_route53(self, defn):
 
         self.dns_hostname = defn.dns_hostname
         self.dns_ttl = defn.dns_ttl
-        self.route53_access_key_id = defn.route53_access_key_id
+        self.route53_access_key_id = defn.route53_access_key_id or nixops.ec2_utils.get_access_key_id()
         self.route53_use_public_dns_name = defn.route53_use_public_dns_name
         record_type = 'CNAME' if self.route53_use_public_dns_name else 'A'
         dns_value = self.public_dns_name if self.route53_use_public_dns_name else self.public_ipv4