provisioners/docker: Simplify raising of Docker related errors

plugins/provisioners/docker/docker_installer.rb

@@ -22,7 +22,7 @@ module VagrantPlugins
           @machine.guest.capability(:docker_install, @version)
 
           if !@machine.guest.capability(:docker_installed)
-            raise Errors::DockerInstallFailed
+            raise DockerError, :install_failed
           end
         end
 

plugins/provisioners/docker/errors.rb

@@ -1,11 +0,0 @@
-module VagrantPlugins
-  module Docker
-    module Errors
-      class DockerInstallFailed < ::Vagrant::Errors::VagrantError
-      end
-
-      class DockerNotRunning < ::Vagrant::Errors::VagrantError
-      end
-    end
-  end
-end

plugins/provisioners/docker/provisioner.rb

@@ -1,9 +1,12 @@
-require_relative "errors"
 require_relative "docker_client"
 require_relative "docker_installer"
 
 module VagrantPlugins
   module Docker
+    class DockerError < Vagrant::Errors::VagrantError
+      error_namespace("vagrant.provisioners.docker")
+    end
+
     # TODO: Improve handling of vagrant-lxc specifics (like checking for apparmor
     #       profile stuff + autocorrection)
     class Provisioner < Vagrant.plugin("2", :provisioner)
@@ -15,7 +18,7 @@ module VagrantPlugins
       end
 
       def provision
-        @logger = Log4r::Logger.new("vagrant::provisioners::vocker")
+        @logger = Log4r::Logger.new("vagrant::provisioners::docker")
 
         @logger.info("Checking for Docker installation...")
         @installer.ensure_installed
@@ -23,7 +26,7 @@ module VagrantPlugins
         # Attempt to start service if not running
         @client.start_service
         unless @client.daemon_running?
-          raise Errors::DockerNotRunning
+          raise DockerError, :not_running
         end
 
         if config.images.any?

templates/locales/en.yml

@@ -1295,3 +1295,7 @@ en:
         playbook_path_invalid: "`playbook` for the Ansible provisioner does not exist on the host system: %{path}"
         inventory_path_invalid: "`inventory_path` for the Ansible provisioner does not exist on the host system: %{path}"
         extra_vars_invalid: "`extra_vars` for the Ansible provisioner must be a hash or a path to an existing file. Received: %{value} (as %{type})"
+
+      docker:
+        not_running: "Docker is not running on the guest VM."
+        install_failed: "Docker installation failed."