launch-node.py : add option to skip ipv6 address checks

As noted inline, this needs to be skipped on OVH (and I always forget,
and debug this over and over when launching a mirror node there :).

Change-Id: I07780e29f5fef75cdbab3b504f278387ddc4b13f

launch/launch-node.py

@@ -94,7 +94,7 @@ def stream_syslog(ssh_client):
 
 
 def bootstrap_server(server, key, name, volume_device, keep,
-                     mount_path, fs_label, environment, timeout):
+                     mount_path, fs_label, environment, timeout, ignore_ipv6):
 
     ip = server.public_v4
     ssh_kwargs = dict(pkey=key)
@@ -120,6 +120,7 @@ def bootstrap_server(server, key, name, volume_device, keep,
 
     ssh_client = utils.ssh_connect(ip, 'root', ssh_kwargs, timeout=timeout)
 
+    if not ignore_ipv6:
         # Something up with RAX images that they have the ipv6 interface in
         # /etc/network/interfaces but eth0 hasn't noticed yet; reload it
         ssh_client.ssh('(ifdown eth0 && ifup eth0) || true')
@@ -208,7 +209,7 @@ def bootstrap_server(server, key, name, volume_device, keep,
 def build_server(cloud, name, image, flavor,
                  volume, keep, network, boot_from_volume, config_drive,
                  mount_path, fs_label, availability_zone, environment,
-                 volume_size, timeout):
+                 volume_size, timeout, ignore_ipv6):
     key = None
     server = None
 
@@ -246,6 +247,7 @@ def build_server(cloud, name, image, flavor,
         cloud.delete_keypair(key_name)
 
         server = cloud.get_openstack_vars(server)
+
         if volume:
             volume = cloud.get_volume(volume)
             volume_device = cloud.get_volume_attach_device(volume,
@@ -253,7 +255,7 @@ def build_server(cloud, name, image, flavor,
         else:
             volume_device = None
         bootstrap_server(server, key, name, volume_device, keep,
-                         mount_path, fs_label, environment, timeout)
+                         mount_path, fs_label, environment, timeout, ignore_ipv6)
         print('UUID=%s\nIPV4=%s\nIPV6=%s\n' % (
             server.id, server.public_v4, server.public_v6))
     except Exception:
@@ -337,6 +339,10 @@ def main():
     parser.add_argument("--timeout", dest="timeout",
                         help="Increase timeouts (default 600s)",
                         type=int, default=600)
+    parser.add_argument("--ignore_ipv6", dest="ignore_ipv6",
+                        help="Ignore IPv6 addresses from API",
+                        action='store_true', default=False)
+
     parser.add_argument("--az", dest="availability_zone", default=None,
                         help="AZ to boot in.")
     options = parser.parse_args()
@@ -366,6 +372,14 @@ def main():
             print(i.name)
         sys.exit(1)
 
+    # NOTE(ianw): 2019-06-26 for whatever reason OVH assigns an IPv6
+    # address that is seen in API queries, but it is not in the host
+    # metadata so the interface isn't autoconfigured.  Auto skip it to
+    # avoid this bombing out.
+    if "-ovh" in options.cloud:
+        print("Ignoring IPv6 for OVH cloud instances")
+        options.ignore_ipv6 = True
+
     server = build_server(cloud, options.name, image, flavor,
                           options.volume, options.keep,
                           options.network, options.boot_from_volume,
@@ -373,7 +387,7 @@ def main():
                           options.mount_path, options.fs_label,
                           options.availability_zone,
                           options.environment, options.volume_size,
-                          options.timeout)
+                          options.timeout, options.ignore_ipv6)
     dns.print_dns(cloud, server)
     print("If this is a server that is expected to send email (ask, review,")
     print("lists, etc) double check that the server's IPs are not listed on")