provisioners/docker: configure auto start properly for new Docker

[GH-2874]

CHANGELOG.md

@@ -82,6 +82,8 @@ BUG FIXES:
   - provisioners/chef: When chowning folders, don't follow symlinks.
   - provisioners/docker: Only add SSH user to docker group if the user
     isn't already in it. [GH-2838]
+  - provisioners/docker: Configuring autostart works properly with
+    the newest versions of Docker. [GH-2874]
   - provisioners/salt: Options can now set install type and install args.
     [GH-2766]
   - synced\_folders/nfs: NFS entries are pruned on every `vagrant up`,

plugins/provisioners/docker/cap/debian/docker_configure_auto_start.rb

@@ -4,8 +4,12 @@ module VagrantPlugins
       module Debian
         module DockerConfigureAutoStart
           def self.docker_configure_auto_start(machine)
-            if ! machine.communicate.test('grep -q \'\-r=true\' /etc/init/docker.conf')
-              machine.communicate.sudo("sed -i.bak 's/docker -d/docker -d -r=true/' /etc/init/docker.conf ")
+            machine.communicate.tap do |comm|
+              if !comm.test('grep -q \'\-r=true\' /etc/default/docker')
+                comm.sudo("echo 'DOCKER_OPTS=\"-r=true ${DOCKER_OPTS}\"' >> /etc/default/docker")
+                comm.sudo("stop docker")
+                comm.sudo("start docker")
+              end
             end
           end
         end

plugins/provisioners/docker/installer.rb

@@ -16,7 +16,7 @@ module VagrantPlugins
         end
 
         if !@machine.guest.capability(:docker_installed)
-          @machine.ui.info(I18n.t("vagrant.docker_installing", version: @version.to_s))
+          @machine.ui.detail(I18n.t("vagrant.docker_installing", version: @version.to_s))
           @machine.guest.capability(:docker_install, @version)
 
           if !@machine.guest.capability(:docker_installed)
@@ -25,6 +25,7 @@ module VagrantPlugins
         end
 
         if @machine.guest.capability?(:docker_configure_auto_start)
+          @machine.ui.detail(I18n.t("vagrant.docker_configure_autostart"))
           @machine.guest.capability(:docker_configure_auto_start)
         else
           @machine.env.ui.warn I18n.t('vagrant.docker_auto_start_not_available')

templates/locales/en.yml

@@ -46,6 +46,8 @@ en:
       Vagrant doesn't support detecting whether Docker is installed
       for the guest OS running in the machine. Vagrant will assume it is
       installed and attempt to continue.
+    docker_configure_autostart: |-
+      Configuring Docker to autostart containers...
     docker_install_with_version_not_supported: |-
       Vagrant is not capable of installing an specific version of Docker
       onto the guest machine and the latest version will be installed.