Various updates.

src/spec.coffee

@@ -334,7 +334,7 @@ module.exports = ->
         if $isVMRunning.call this
           @genval.resident_on
         else
-          # TODO: Handle local VMs.
+          # TODO: Handle local VMs. (`get_possible_hosts()`).
           @genval.$poolRef
 
       snapshots: -> @genval.snapshots
@@ -490,7 +490,19 @@ module.exports = ->
     @val = {
       attached: -> @genval.currently_attached
 
-      VDI: -> @genval.VDI
+      bootable: -> @genval.bootable
+
+      read_only: -> @genval.mode is 'RO'
+
+      # null if empty.
+      #
+      # TODO: Is it really equivalent?
+      VDI: ->
+        VDI = @genval.VDI
+        if VDI is 'OpaqueRef:NULL'
+          null
+        else
+          VDI
 
       VM: -> @genval.VM
     }

src/spec.spec.coffee

@@ -307,6 +307,8 @@ describe 'spec', ->
 
     $expect(vm.template_info).to.be.an 'object'
 
+    $expect(vm.template_info.arch).to.equal 'amd64'
+
     $expect(vm.template_info.disks).to.deep.equal [
       {
         device: '0'
@@ -455,6 +457,10 @@ describe 'spec', ->
 
     $expect(vbd.attached).to.be.true
 
+    $expect(vbd.bootable).to.be.false
+
+    $expect(vbd.read_only).to.be.false
+
     $expect(vbd.VDI).to.equal 'OpaqueRef:1f7f9828-f4e7-41dd-20e6-3bf57c559a78'
 
     $expect(vbd.VM).to.equal 'OpaqueRef:be2390b2-cd08-53f5-3fae-b76f6f3725bf'