Auto-detect policy server IP for CFEngine

lib/vagrant/errors.rb

@@ -139,6 +139,10 @@ module Vagrant
       error_key(:cfengine_bootstrap_failed)
     end
 
+    class CFEngineCantAutodetectIP < VagrantError
+      error_key(:cfengine_cant_autodetect_ip)
+    end
+
     class CFEngineInstallFailed < VagrantError
       error_key(:cfengine_install_failed)
     end

plugins/guests/linux/cap/read_ip_address.rb

@@ -0,0 +1,17 @@
+module VagrantPlugins
+  module GuestLinux
+    module Cap
+      class ReadIPAddress
+        def self.read_ip_address(machine)
+          command = "ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'"
+          result  = ""
+          machine.communicate.execute(command) do |type, data|
+            result << data if type == :stdout
+          end
+
+          result.chomp
+        end
+      end
+    end
+  end
+end

plugins/guests/linux/plugin.rb

@@ -30,6 +30,11 @@ module VagrantPlugins
         require_relative "cap/mount_virtualbox_shared_folder"
         Cap::MountVirtualBoxSharedFolder
       end
+
+      guest_capability("linux", "read_ip_address") do
+        require_relative "cap/read_ip_address"
+        Cap::ReadIPAddress
+      end
     end
   end
 end

plugins/provisioners/cfengine/config.rb

@@ -90,7 +90,9 @@ module VagrantPlugins
         errors << I18n.t("vagrant.cfengine_config.invalid_mode") if !valid_modes.include?(@mode)
 
         if @mode == :bootstrap
-          errors << I18n.t("vagrant.cfengine_config.policy_server_address") if !@policy_server_address
+          if !@policy_server_address && !@am_policy_hub
+            errors << I18n.t("vagrant.cfengine_config.policy_server_address")
+          end
         end
 
         if @classes && !@classes.is_a?(Array)

plugins/provisioners/cfengine/provisioner.rb

@@ -79,6 +79,11 @@ module VagrantPlugins
 
         # Needs bootstrap, let's determine the parameters
         policy_server_address = @config.policy_server_address
+        if !policy_server_address
+          policy_server_address = @machine.guest.capability(:read_ip_address)
+          raise Vagrant::Errors::CFEngineCantAutodetectIP if !policy_server_address
+          @machine.ui.info(I18n.t("vagrant.cfengine_detected_ip", address: policy_server_address))
+        end
 
         @machine.ui.info(I18n.t("vagrant.cfengine_bootstrapping",
                                 policy_server: policy_server_address))

templates/locales/en.yml

@@ -4,10 +4,17 @@ en:
       Bootstrapping CFEngine with policy server: %{policy_server}...
     cfengine_bootstrapping_policy_hub: |-
       Performing additional bootstrap for policy hubs...
+    cfengine_cant_autodetect_ip: |-
+      Vagrant was unable to automatically detect the IP address of the
+      running machine to use as the policy server address. Please specify
+      the policy server address manually, or verify that the networks are
+      configured properly internally.
     cfengine_cant_detect: |-
       Vagrant doesn't support detecting whether CFEngine is installed
       for the guest OS running in the machine. Vagrant will assume it is
       installed and attempt to continue.
+    cfengine_detected_ip: |-
+      Detected policy server IP address: %{address}...
     cfengine_installing: |-
       Installing CFEngine onto machine...
     cfengine_installing_files_path: |-