add code to invoke networking config

there is no data source that has a populated network_config()
so at this point this doesn't do anything.

4 files changed, 46 insertions, 1 deletions

diff --git a/cloudinit/distros/__init__.py b/cloudinit/distros/__init__.py
index 74b484a7..418421b9 100644
--- a/cloudinit/distros/__init__.py
+++ b/cloudinit/distros/__init__.py
@@ -135,7 +135,7 @@ class Distro(object):
             return self._bring_up_interfaces(dev_names)
         return False
 
-    def apply_network_config(self, netconfig, bring_up=True):
+    def apply_network_config(self, netconfig, bring_up=False):
         # Write it out
         dev_names = self._write_network_config(netconfig)
         # Now try to bring them up
diff --git a/cloudinit/net/__init__.py b/cloudinit/net/__init__.py
index 3cf99604..799cb97e 100644
--- a/cloudinit/net/__init__.py
+++ b/cloudinit/net/__init__.py
@@ -434,4 +434,21 @@ def render_network_state(target, network_state):
     with open(netrules, 'w+') as f:
         f.write(render_persistent_net(network_state))
 
+
+def is_disabled_cfg(cfg):
+    if not cfg or not isinstance(cfg, dict):
+        return False
+    return cfg.get('config') == "disabled"
+
+
+def generate_fallback_config():
+    # FIXME: add implementation here
+    return None
+
+
+def read_kernel_cmdline_config():
+    # FIXME: add implementation here
+    return None
+
+
 # vi: ts=4 expandtab syntax=python
diff --git a/cloudinit/sources/__init__.py b/cloudinit/sources/__init__.py
index 28540a7b..c63464b2 100644
--- a/cloudinit/sources/__init__.py
+++ b/cloudinit/sources/__init__.py
@@ -221,6 +221,10 @@ class DataSource(object):
         # quickly (local check only) if self.instance_id is still
         return False
 
+    @property
+    def network_config(self):
+        return None
+
 
 def normalize_pubkey_data(pubkey_data):
     keys = []
diff --git a/cloudinit/stages.py b/cloudinit/stages.py
index c230ec0d..8e681e29 100644
--- a/cloudinit/stages.py
+++ b/cloudinit/stages.py
@@ -43,6 +43,7 @@ from cloudinit import distros
 from cloudinit import helpers
 from cloudinit import importer
 from cloudinit import log as logging
+from cloudinit import net
 from cloudinit import sources
 from cloudinit import type_utils
 from cloudinit import util
@@ -567,6 +568,29 @@ class Init(object):
         # Run the handlers
         self._do_handlers(user_data_msg, c_handlers_list, frequency)
 
+    def _find_networking_config(self):
+        cmdline_cfg = ('cmdline', net.read_kernel_cmdline_config())
+        dscfg = ('ds', None)
+        if self.datasource and hasattr(self.datasource, 'network_config'):
+            dscfg = ('ds', self.datasource.network_config)
+        sys_cfg = ('system_cfg', self.cfg.get('network'))
+
+        for loc, ncfg in (cmdline_cfg, dscfg, sys_cfg):
+            if net.is_disabled_cfg(ncfg):
+                LOG.debug("network config disabled by %s", loc)
+                return None
+            if ncfg:
+                return ncfg
+        return net.generate_fallback_config()
+
+    def apply_network_config(self):
+        netcfg = self._find_networking_config()
+        if netcfg is None:
+            LOG.info("network config is disabled")
+            return
+
+        return self.distro.apply_network_config(netcfg)
+
 
 class Modules(object):
     def __init__(self, init, cfg_files=None, reporter=None):