core: MachineIndex can have extra data attached to it

lib/vagrant/machine_index.rb

@@ -318,6 +318,12 @@ module Vagrant
       # @return [DateTime]
       attr_reader :updated_at
 
+      # Extra data to store with the index entry. This can be anything
+      # and is treated like a general global state bag.
+      #
+      # @return [Hash]
+      attr_accessor :extra_data
+
       # Initializes an entry.
       #
       # The parameter given should be nil if this is being created
@@ -333,6 +339,7 @@ module Vagrant
         @vagrantfile_path = Pathname.new(raw["vagrantfile_path"])
         # TODO(mitchellh): parse into a proper datetime
         @updated_at       = raw["updated_at"]
+        @extra_data       = raw["extra_data"] || {}
       end
 
       # Converts to the structure used by the JSON
@@ -343,6 +350,7 @@ module Vagrant
           "state"            => @state,
           "vagrantfile_path" => @vagrantfile_path,
           "updated_at"       => @updated_at,
+          "extra_data"       => @extra_data,
         }
       end
     end

test/unit/vagrant/machine_directory_test.rb

@@ -79,7 +79,17 @@ describe Vagrant::MachineIndex do
             "vagrantfile_path" => "/foo/bar/baz",
             "state" => "running",
             "updated_at" => "foo",
-          }
+          },
+          "baz" => {
+            "name" => "default",
+            "provider" => "vmware",
+            "vagrantfile_path" => "/foo/bar/baz",
+            "state" => "running",
+            "updated_at" => "foo",
+            "extra_data" => {
+              "foo" => "bar",
+            },
+          },
         }
       }
 
@@ -101,6 +111,15 @@ describe Vagrant::MachineIndex do
       expect(result.vagrantfile_path).to eq(Pathname.new("/foo/bar/baz"))
       expect(result.state).to eq("running")
       expect(result.updated_at).to eq("foo")
+      expect(result.extra_data).to eq({})
+    end
+
+    it "returns a valid entry with extra data" do
+      result = subject.get("baz")
+      expect(result.id).to eq("baz")
+      expect(result.extra_data).to eq({
+        "foo" => "bar",
+      })
     end
 
     it "returns a valid entry by unique prefix" do
@@ -191,6 +210,7 @@ describe Vagrant::MachineIndex do
       expect(result.id).to_not be_empty
 
       result.name = "bar"
+      result.extra_data["foo"] = "bar"
 
       nextresult = subject.set(result)
       expect(nextresult.id).to eq(result.id)
@@ -203,6 +223,9 @@ describe Vagrant::MachineIndex do
       entry   = subject.get(result.id)
       expect(entry).to_not be_nil
       expect(entry.name).to eq("bar")
+      expect(entry.extra_data).to eq({
+        "foo" => "bar",
+      })
     end
   end
 end