add Openbsd support (#147)

- tested on OpenBSD 6.6
- tested on OpenStack without config drive, and NoCloud with ISO config
  drive

1 files changed, 20 insertions, 3 deletions

diff --git a/cloudinit/net/__init__.py b/cloudinit/net/__init__.py
index 400d7870..67e3d578 100644
--- a/cloudinit/net/__init__.py
+++ b/cloudinit/net/__init__.py
@@ -334,13 +334,13 @@ def find_fallback_nic(blacklist_drivers=None):
     """Return the name of the 'fallback' network device."""
     if util.is_FreeBSD():
         return find_fallback_nic_on_freebsd(blacklist_drivers)
-    elif util.is_NetBSD():
-        return find_fallback_nic_on_netbsd(blacklist_drivers)
+    elif util.is_NetBSD() or util.is_OpenBSD():
+        return find_fallback_nic_on_netbsd_or_openbsd(blacklist_drivers)
     else:
         return find_fallback_nic_on_linux(blacklist_drivers)
 
 
-def find_fallback_nic_on_netbsd(blacklist_drivers=None):
+def find_fallback_nic_on_netbsd_or_openbsd(blacklist_drivers=None):
     values = list(sorted(
         get_interfaces_by_mac().values(),
         key=natural_sort_key))
@@ -811,6 +811,8 @@ def get_interfaces_by_mac():
         return get_interfaces_by_mac_on_freebsd()
     elif util.is_NetBSD():
         return get_interfaces_by_mac_on_netbsd()
+    elif util.is_OpenBSD():
+        return get_interfaces_by_mac_on_openbsd()
     else:
         return get_interfaces_by_mac_on_linux()
 
@@ -857,6 +859,21 @@ def get_interfaces_by_mac_on_netbsd():
     return ret
 
 
+def get_interfaces_by_mac_on_openbsd():
+    ret = {}
+    re_field_match = (
+        r"(?P<ifname>\w+).*lladdr\s"
+        r"(?P<mac>([\da-f]{2}[:-]){5}([\da-f]{2})).*")
+    (out, _) = util.subp(['ifconfig', '-a'])
+    if_lines = re.sub(r'\n\s+', ' ', out).splitlines()
+    for line in if_lines:
+        m = re.match(re_field_match, line)
+        if m:
+            fields = m.groupdict()
+            ret[fields['mac']] = fields['ifname']
+    return ret
+
+
 def get_interfaces_by_mac_on_linux():
     """Build a dictionary of tuples {mac: name}.