add Openbsd support (#147)

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

3 files changed, 68 insertions, 4 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}.
 
diff --git a/cloudinit/net/openbsd.py b/cloudinit/net/openbsd.py
new file mode 100644
index 00000000..b9897e90
--- /dev/null
+++ b/cloudinit/net/openbsd.py
@@ -0,0 +1,44 @@
+# This file is part of cloud-init. See LICENSE file for license information.
+
+from cloudinit import log as logging
+from cloudinit import util
+import cloudinit.net.bsd
+
+LOG = logging.getLogger(__name__)
+
+
+class Renderer(cloudinit.net.bsd.BSDRenderer):
+
+    def write_config(self):
+        for device_name, v in self.interface_configurations.items():
+            if_file = 'etc/hostname.{}'.format(device_name)
+            fn = util.target_path(self.target, if_file)
+            if device_name in self.dhcp_interfaces():
+                content = 'dhcp\n'
+            elif isinstance(v, dict):
+                try:
+                    content = "inet {address} {netmask}\n".format(
+                            address=v['address'],
+                            netmask=v['netmask'])
+                except KeyError:
+                    LOG.error(
+                        "Invalid static configuration for %s",
+                        device_name)
+            util.write_file(fn, content)
+
+    def start_services(self, run=False):
+        if not self._postcmds:
+            LOG.debug("openbsd generate postcmd disabled")
+            return
+        util.subp(['sh', '/etc/netstart'], capture=True)
+
+    def set_route(self, network, netmask, gateway):
+        if network == '0.0.0.0':
+            if_file = 'etc/mygate'
+            fn = util.target_path(self.target, if_file)
+            content = gateway + '\n'
+            util.write_file(fn, content)
+
+
+def available(target=None):
+    return util.is_OpenBSD()
diff --git a/cloudinit/net/renderers.py b/cloudinit/net/renderers.py
index e4bcae9d..e2de4d55 100644
--- a/cloudinit/net/renderers.py
+++ b/cloudinit/net/renderers.py
@@ -5,6 +5,7 @@ from . import freebsd
 from . import netbsd
 from . import netplan
 from . import RendererNotFoundError
+from . import openbsd
 from . import sysconfig
 
 NAME_TO_RENDERER = {
@@ -12,10 +13,12 @@ NAME_TO_RENDERER = {
     "freebsd": freebsd,
     "netbsd": netbsd,
     "netplan": netplan,
+    "openbsd": openbsd,
     "sysconfig": sysconfig,
 }
 
-DEFAULT_PRIORITY = ["eni", "sysconfig", "netplan", "freebsd", "netbsd"]
+DEFAULT_PRIORITY = ["eni", "sysconfig", "netplan", "freebsd",
+                    "netbsd", "openbsd"]
 
 
 def search(priority=None, target=None, first=False):