vagrant-up now starts the VM if its already created, rather than giving an error.

bin/vagrant-up

@@ -18,7 +18,9 @@ GitStyleBinary.command do
   banner <<-EOS
 Usage: #{command.full_name} #{all_options_string}
 
-Create the vagrant environment.
+Create the vagrant environment if it doesn't exist,
+otherwise start the vagrant environment if its not
+already running.
 
 EOS
 

lib/vagrant/commands.rb

@@ -32,16 +32,12 @@ error
         Env.load!
 
         if Env.persisted_vm
-          error_and_exit(<<-error)
-The task you're trying to run requires that the vagrant environment
-not exist yet, but it appears you already have an instance running
-or available. If you really want to rebuild this instance, please
-run `vagrant down` first.
-error
+          logger.info "VM already created. Starting VM if its not already running..."
+          Env.persisted_vm.start
+        else
+          Env.require_box
+          VM.execute!(Actions::VM::Up)
         end
-
-        Env.require_box
-        VM.execute!(Actions::VM::Up)
       end
 
       # Tear down a vagrant instance. This not only shuts down the instance

lib/vagrant/vm.rb

@@ -25,6 +25,15 @@ module Vagrant
       execute!
     end
 
+    def start
+      actions = [Actions::VM::ForwardPorts, Actions::VM::SharedFolders, Actions::VM::Start]
+      actions.each do |action|
+        add_action(action)
+      end
+
+      execute!
+    end
+
     def destroy
       execute!(Actions::VM::Halt) if @vm.running?
 

test/vagrant/commands_test.rb

@@ -46,15 +46,15 @@ class CommandsTest < Test::Unit::TestCase
       Vagrant::Commands.up
     end
 
-    should "error if a persisted VM already exists" do
-      Vagrant::Env.expects(:persisted_vm).returns(true)
-      Vagrant::Commands.expects(:error_and_exit).once
-      Vagrant::VM.expects(:up).never
+    should "call the up action on VM if it doesn't exist" do
+      Vagrant::VM.expects(:execute!).with(Vagrant::Actions::VM::Up).once
       Vagrant::Commands.up
     end
 
-    should "call the up action on VM" do
-      Vagrant::VM.expects(:execute!).with(Vagrant::Actions::VM::Up).once
+    should "call start on the persisted vm if it exists" do
+      Vagrant::Env.stubs(:persisted_vm).returns(@persisted_vm)
+      @persisted_vm.expects(:start).once
+      Vagrant::VM.expects(:execute!).never
       Vagrant::Commands.up
     end
   end

test/vagrant/vm_test.rb

@@ -78,5 +78,19 @@ class VMTest < Test::Unit::TestCase
         @vm.save_state
       end
     end
+
+    context "starting" do
+      should "add and execute the proper actions" do
+        actions = [Vagrant::Actions::VM::ForwardPorts, Vagrant::Actions::VM::SharedFolders, Vagrant::Actions::VM::Start]
+
+        action_seq = sequence("action_seq")
+        actions.each do |action|
+          @vm.expects(:add_action).with(action).in_sequence(action_seq)
+        end
+
+        @vm.expects(:execute!).once.in_sequence(action_seq)
+        @vm.start
+      end
+    end
   end
 end