guests/coreos: docker_daemon_running cap [GH-3425]

CHANGELOG.md

@@ -18,6 +18,7 @@ BUG FIXES:
   - commands/package: Nice error if includes contain symlinks. [GH-3200]
   - commands/rsync-auto: Don't crash if the machine can't be communicated
       to. [GH-3419]
+  - guests/coreos: Docker provisioner works. [GH-3425]
   - guests/fedora: Fix hostname setting. [GH-3382]
   - guests/fedora: Support predictable network interface names for
       public/private networks. [GH-3207]

plugins/guests/coreos/cap/docker.rb

@@ -0,0 +1,11 @@
+module VagrantPlugins
+  module GuestCoreOS
+    module Cap
+      module Docker
+        def self.docker_daemon_running(machine)
+          machine.communicate.test("test -f /run/docker.sock")
+        end
+      end
+    end
+  end
+end

plugins/guests/coreos/plugin.rb

@@ -20,6 +20,11 @@ module VagrantPlugins
         require_relative "cap/configure_networks"
         Cap::ConfigureNetworks
       end
+
+      guest_capability("coreos", "docker_daemon_running") do
+        require_relative "cap/docker"
+        Cap::Docker
+      end
     end
   end
 end

plugins/providers/docker/action/host_machine.rb

@@ -0,0 +1,17 @@
+module VagrantPlugins
+  module DockerProvider
+    module Action
+      # This action is responsible for creating the host machine if
+      # we need to.
+      class HostMachine
+        def initialize(app, env)
+          @app = app
+        end
+
+        def call(env)
+          @app.call(env)
+        end
+      end
+    end
+  end
+end

plugins/provisioners/docker/cap/linux/docker_daemon_running.rb

@@ -0,0 +1,13 @@
+module VagrantPlugins
+  module Docker
+    module Cap
+      module Linux
+        module DockerDaemonRunning
+          def self.docker_daemon_running(machine)
+            machine.communicate.test("test -f /var/run/docker/pid")
+          end
+        end
+      end
+    end
+  end
+end

plugins/provisioners/docker/client.rb

@@ -32,7 +32,7 @@ module VagrantPlugins
       end
 
       def daemon_running?
-        @machine.communicate.test('test -f /var/run/docker.pid')
+        @machine.guest.capability(:docker_daemon_running)
       end
 
       def run(containers)

plugins/provisioners/docker/plugin.rb

@@ -54,6 +54,11 @@ module VagrantPlugins
         Cap::Linux::DockerConfigureVagrantUser
       end
 
+      guest_capability("linux", "docker_daemon_running") do
+        require_relative "cap/linux/docker_daemon_running"
+        Cap::Linux::DockerDaemonRunning
+      end
+
       provisioner(:docker) do
         require_relative "provisioner"
         Provisioner