Add Netbsd support (#62)

Add support for the NetBSD Operating System.                                    
                                                                                
Features in this branch:                                                        
* Add BSD distro parent class from which NetBSD and FreeBSD can                 
  specialize                                                                    
* Add *bsd util functions to cloudinit.net and cloudinit.net.bsd_utils          
* subclass cloudinit.distro.freebsd.Distro from bsd.Distro                      
* Add new cloudinit.distro.netbsd and cloudinit.net.renderer for                
  netbsd                                                                        
* Add lru_cached util.is_NetBSD functions                                       
* Add NetBSD detection for ConfigDrive and NoCloud datasources                  
                                                                                
This branch has been tested with:                                               
                                                                                
- NoCloud and OpenStack (with and without config-drive)                         
- NetBSD 8.1. and 9.0                                                           
- FreeBSD 11.2 and 12.1                                                         
- Python 3.7 only, because of the dependency oncrypt.METHOD_BLOWFISH.           
  This version is available in NetBSD 7, 8 and 9 anyway

1 files changed, 27 insertions, 0 deletions

diff --git a/cloudinit/net/__init__.py b/cloudinit/net/__init__.py
index 1d5eb535..400d7870 100644
--- a/cloudinit/net/__init__.py
+++ b/cloudinit/net/__init__.py
@@ -334,10 +334,20 @@ 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)
     else:
         return find_fallback_nic_on_linux(blacklist_drivers)
 
 
+def find_fallback_nic_on_netbsd(blacklist_drivers=None):
+    values = list(sorted(
+        get_interfaces_by_mac().values(),
+        key=natural_sort_key))
+    if values:
+        return values[0]
+
+
 def find_fallback_nic_on_freebsd(blacklist_drivers=None):
     """Return the name of the 'fallback' network device on FreeBSD.
 
@@ -799,6 +809,8 @@ def get_ib_interface_hwaddr(ifname, ethernet_format):
 def get_interfaces_by_mac():
     if util.is_FreeBSD():
         return get_interfaces_by_mac_on_freebsd()
+    elif util.is_NetBSD():
+        return get_interfaces_by_mac_on_netbsd()
     else:
         return get_interfaces_by_mac_on_linux()
 
@@ -830,6 +842,21 @@ def get_interfaces_by_mac_on_freebsd():
     return results
 
 
+def get_interfaces_by_mac_on_netbsd():
+    ret = {}
+    re_field_match = (
+            r"(?P<ifname>\w+).*address:\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}.