Automatically generate a node_name for Chef

This is required because the Chef Server almost always needs a node name to
interact. This will default to the hostname, but that's always going to be
`vagrant.vm`, which will collide easily.

This generates a random hostname with `vagrant-` as the prefix and stores the
result in the machine's data directory.

plugins/provisioners/chef/provisioner/base.rb

@@ -19,6 +19,22 @@ module VagrantPlugins
           super
 
           @logger = Log4r::Logger.new("vagrant::provisioners::chef")
+
+          if @config.node_name.to_s.empty?
+            cache = @machine.data_dir.join("chef_node_name")
+
+            if !cache.exist?
+              @machine.ui.info I18n.t("vagrant.provisioners.chef.generating_node_name")
+              cache.open("w+") do |f|
+                f.write("vagrant-#{SecureRandom.hex(4)}")
+              end
+            end
+
+            if cache.file?
+              @logger.info("Loading cached node_name...")
+              @config.node_name = cache.read.strip
+            end
+          end
         end
 
         def install_chef
@@ -123,7 +139,7 @@ module VagrantPlugins
         end
 
         def setup_json
-          @machine.env.ui.info I18n.t("vagrant.provisioners.chef.json")
+          @machine.ui.info I18n.t("vagrant.provisioners.chef.json")
 
           # Get the JSON that we're going to expose to Chef
           json = @config.json
@@ -154,7 +170,7 @@ module VagrantPlugins
           remote_file = guest_encrypted_data_bag_secret_key_path
           return if !remote_file
 
-          @machine.env.ui.info I18n.t(
+          @machine.ui.info I18n.t(
             "vagrant.provisioners.chef.upload_encrypted_data_bag_secret_key")
 
           @machine.communicate.tap do |comm|

plugins/provisioners/chef/provisioner/chef_client.rb

@@ -31,8 +31,13 @@ module VagrantPlugins
         end
 
         def cleanup
-          delete_from_chef_server('node') if @config.delete_node
-          delete_from_chef_server('client') if @config.delete_client
+          if @config.delete_node
+            delete_from_chef_server("node")
+          end
+
+          if @config.delete_client
+            delete_from_chef_server("client")
+          end
         end
 
         def create_client_key_folder

templates/locales/en.yml

@@ -1931,6 +1931,8 @@ en:
           "The cookbook path '%{path}' doesn't exist. Ignoring..."
         json: "Generating chef JSON and uploading..."
         client_key_folder: "Creating folder to hold client key..."
+        generating_node_name: |-
+          Auto-generating node name for Chef...
         install_failed: |-
           Vagrant could not detect Chef on the guest! Even after Vagrant
           attempted to install Chef, it could still not find Chef on the system.

test/unit/plugins/provisioners/chef/provisioner/base_test.rb

@@ -5,11 +5,23 @@ require Vagrant.source_root.join("plugins/provisioners/chef/provisioner/base")
 describe VagrantPlugins::Chef::Provisioner::Base do
   include_context "unit"
 
-  let(:machine) { double("machine") }
+  let(:iso_env) do
+    # We have to create a Vagrantfile so there is a root path
+    env = isolated_environment
+    env.vagrantfile("")
+    env.create_vagrant_env
+  end
+
+  let(:machine) { iso_env.machine(iso_env.machine_names[0], :dummy) }
   let(:config)  { double("config") }
 
   subject { described_class.new(machine, config) }
 
+  before do
+    allow(config).to receive(:node_name)
+    allow(config).to receive(:node_name=)
+  end
+
   describe "#encrypted_data_bag_secret_key_path" do
     let(:env) { double("env") }
     let(:root_path) { "/my/root" }