Replace netifaces library

The natifaces library[1] was abandoned more than 3 years ago. Replace
it by psutils which is already used by a few other projects.

[1] https://github.com/al45tair/netifaces

Closes-Bug: #2071596
Change-Id: I805321229e84a57312bbe160d330281e6c13ab97

openstack/cloud/_utils.py

@@ -15,12 +15,14 @@
 import contextlib
 import fnmatch
 import inspect
+import ipaddress
 import re
+import socket
 import uuid
 
 from decorator import decorator
 import jmespath
-import netifaces
+import psutil
 
 from openstack import _log
 from openstack import exceptions
@@ -182,15 +184,19 @@ def _get_entity(cloud, resource, name_or_id, filters, **kwargs):
 def localhost_supports_ipv6():
     """Determine whether the local host supports IPv6
 
-    We look for a default route that supports the IPv6 address family,
-    and assume that if it is present, this host has globally routable
-    IPv6 connectivity.
+    We look for the all ip addresses configured to this node, and assume that
+    if any of these is IPv6 address (but not loopback or link local), this host
+    has IPv6 connectivity.
     """
 
-    try:
-        return netifaces.AF_INET6 in netifaces.gateways()['default']
-    except AttributeError:
-        return False
+    for ifname, if_addrs in psutil.net_if_addrs().items():
+        for if_addr in if_addrs:
+            if if_addr.family != socket.AF_INET6:
+                continue
+            addr = ipaddress.ip_address(if_addr.address)
+            if not addr.is_link_local and not addr.is_loopback:
+                return True
+    return False
 
 
 def valid_kwargs(*valid_args):

releasenotes/notes/replace-netifaces-632f60884fb7ae00.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    IPv6 support now is detected according to the IP addresses assigned to all
+    network interfaces, instead of presence of IPv6 default route. In case
+    there is any IP v6 address, which is not loopback or link-local, then
+    the host is considered to support IPv6.

requirements.txt

@@ -5,9 +5,9 @@ iso8601>=0.1.11 # MIT
 jmespath>=0.9.0 # MIT
 jsonpatch!=1.20,>=1.16 # BSD
 keystoneauth1>=3.18.0 # Apache-2.0
-netifaces>=0.10.4 # MIT
 os-service-types>=1.7.0 # Apache-2.0
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 platformdirs>=3 # MIT License
+psutil>=3.2.2 # BSD
 PyYAML>=3.13 # MIT
 requestsexceptions>=1.2.0 # Apache-2.0