net: introduce is_ip_address function (#288)

This will be required for the mirror URL sanitisation work,

1 files changed, 18 insertions, 1 deletions

diff --git a/cloudinit/net/__init__.py b/cloudinit/net/__init__.py
index 67e3d578..08eaf0a3 100644
--- a/cloudinit/net/__init__.py
+++ b/cloudinit/net/__init__.py
@@ -6,13 +6,14 @@
 # This file is part of cloud-init. See LICENSE file for license information.
 
 import errno
+import ipaddress
 import logging
 import os
 import re
 from functools import partial
 
-from cloudinit.net.network_state import mask_to_net_prefix
 from cloudinit import util
+from cloudinit.net.network_state import mask_to_net_prefix
 from cloudinit.url_helper import UrlError, readurl
 
 LOG = logging.getLogger(__name__)
@@ -961,6 +962,22 @@ def has_url_connectivity(url):
     return True
 
 
+def is_ip_address(s: str) -> bool:
+    """Returns a bool indicating if ``s`` is an IP address.
+
+    :param s:
+        The string to test.
+
+    :return:
+        A bool indicating if the string contains an IP address or not.
+    """
+    try:
+        ipaddress.ip_address(s)
+    except ValueError:
+        return False
+    return True
+
+
 class EphemeralIPv4Network(object):
     """Context manager which sets up temporary static network configuration.