core: MachineIndex is enumerable

lib/vagrant/machine_index.rb

@@ -34,6 +34,8 @@ module Vagrant
   #   }
   #
   class MachineIndex
+    include Enumerable
+
     # Initializes a MachineIndex at the given file location.
     #
     # @param [Pathname] data_dir Path to the directory where data for the
@@ -82,6 +84,15 @@ module Vagrant
       true
     end
 
+    # Iterate over every machine in the index. The yielded {Entry} objects
+    # will NOT be locked, so you'll have to call {#get} manually to acquire
+    # the lock on them.
+    def each
+      @machines.each do |uuid, data|
+        yield Entry.new(uuid, data.merge("id" => uuid))
+      end
+    end
+
     # Accesses a machine by UUID and returns a {MachineIndex::Entry}
     #
     # The entry returned is locked and can't be read again or updated by

test/unit/vagrant/machine_directory_test.rb

@@ -10,6 +10,7 @@ describe Vagrant::MachineIndex do
   include_context "unit"
 
   let(:data_dir) { temporary_dir }
+  let(:entry_klass) { Vagrant::MachineIndex::Entry }
 
   subject { described_class.new(data_dir) }
 
@@ -31,6 +32,35 @@ describe Vagrant::MachineIndex do
       to raise_error(Vagrant::Errors::CorruptMachineIndex)
   end
 
+  describe "#each" do
+    before do
+      5.times do |i|
+        e = entry_klass.new
+        e.name = "entry-#{i}"
+        e.vagrantfile_path = "/foo"
+        subject.release(subject.set(e))
+      end
+    end
+
+    it "should iterate over all the elements" do
+      items = []
+
+      subject = described_class.new(data_dir)
+      subject.each do |entry|
+        items << entry.name
+      end
+
+      items.sort!
+      expect(items).to eq([
+        "entry-0",
+        "entry-1",
+        "entry-2",
+        "entry-3",
+        "entry-4",
+      ])
+    end
+  end
+
   describe "#get and #release" do
     before do
       data = {
@@ -85,8 +115,6 @@ describe Vagrant::MachineIndex do
   end
 
   describe "#set and #get and #delete" do
-    let(:entry_klass) { Vagrant::MachineIndex::Entry }
-
     let(:new_entry) do
       entry_klass.new.tap do |e|
         e.name = "foo"