Added newrev and oldrev to the hook data

app/services/git_tag_push_service.rb

 class GitTagPushService
   attr_accessor :project, :user, :push_data
-  def execute(project, user, ref)
+  def execute(project, user, oldrev, newrev, ref)
     @project, @user = project, user
-    @push_data = create_push_data(ref)
+    @push_data = create_push_data(oldrev, newrev, ref)
     project.execute_hooks(@push_data.dup, :tag_push_hooks)
   end
 
   private
 
-  def create_push_data(ref)
+  def create_push_data(oldrev, newrev, ref)
     data = {
       ref: ref,
+      oldrev: oldrev,
+      newrev: newrev,
       user_id: user.id,
       user_name: user.name,
       project_id: project.id,

app/workers/post_receive.rb

@@ -30,7 +30,7 @@ class PostReceive
     end
 
     if tag?(ref)
-      GitTagPushService.new.execute(project, user, ref)
+      GitTagPushService.new.execute(project, user, oldrev, newrev, ref)
     else
       GitPushService.new.execute(project, user, oldrev, newrev, ref)
     end

spec/services/git_tag_push_service_spec.rb

@@ -7,17 +7,21 @@ describe GitTagPushService do
 
   before do
     @ref = 'refs/tags/super-tag'
+    @oldrev = 'b98a310def241a6fd9c9a9a3e7934c48e498fe81'
+    @newrev = 'b19a04f53caeebf4fe5ec2327cb83e9253dc91bb'
   end
 
   describe 'Git Tag Push Data' do
     before do
-      service.execute(project, user, @ref)
+      service.execute(project, user, @oldrev, @newrev, @ref)
       @push_data = service.push_data
     end
 
     subject { @push_data }
 
     it { should include(ref: @ref) }
+    it { should include(oldrev: @oldrev) }
+    it { should include(newrev: @newrev) }
     it { should include(user_id: user.id) }
     it { should include(user_name: user.name) }
     it { should include(project_id: project.id) }
@@ -36,7 +40,7 @@ describe GitTagPushService do
     context "execute web hooks" do
       it "when pushing tags" do
         project.should_receive(:execute_hooks)
-        service.execute(project, user, 'refs/tags/v1.0.0')
+        service.execute(project, user, 'oldrev', 'newrev', 'refs/tags/v1.0.0')
       end
     end
   end