providers/docker: can set custom container name

plugins/providers/docker/action/create.rb

@@ -43,9 +43,12 @@ module VagrantPlugins
         end
 
         def create_params
+          container_name = @provider_config.name
+          if !container_name
             container_name = "#{@env[:root_path].basename.to_s}_#{@machine.name}"
             container_name.gsub!(/[^-a-z0-9_]/i, "")
             container_name << "_#{Time.now.to_i}"
+          end
 
           links = {}
           @provider_config._links.each do |link|

plugins/providers/docker/config.rb

@@ -19,6 +19,12 @@ module VagrantPlugins
       # provisioning, etc.
       attr_accessor :has_ssh
 
+      # The name for the container. This must be unique for all containers
+      # on the proxy machine if it is made.
+      #
+      # @return [String]
+      attr_accessor :name
+
       # True if the docker container is meant to stay in the "running"
       # state (is a long running process). By default this is true.
       #
@@ -53,6 +59,7 @@ module VagrantPlugins
         @env        = {}
         @has_ssh    = UNSET_VALUE
         @image      = UNSET_VALUE
+        @name       = UNSET_VALUE
         @links      = []
         @ports      = []
         @privileged = UNSET_VALUE
@@ -85,6 +92,7 @@ module VagrantPlugins
         @env       ||= {}
         @has_ssh    = false if @has_ssh == UNSET_VALUE
         @image      = nil if @image == UNSET_VALUE
+        @name       = nil if @name == UNSET_VALUE
         @privileged = false if @privileged == UNSET_VALUE
         @remains_running = true if @remains_running == UNSET_VALUE
         @vagrant_machine = nil if @vagrant_machine == UNSET_VALUE

test/unit/plugins/providers/docker/config_spec.rb

@@ -27,6 +27,7 @@ describe VagrantPlugins::DockerProvider::Config do
     its(:cmd) { should eq([]) }
     its(:env) { should eq({}) }
     its(:image) { should be_nil }
+    its(:name) { should be_nil }
     its(:privileged) { should be_false }
     its(:vagrant_machine) { should be_nil }
     its(:vagrant_vagrantfile) { should be_nil }