Use Gitlab::Git helper methods and constants as much as possible.

app/controllers/projects/tags_controller.rb

@@ -27,7 +27,7 @@ class Projects::TagsController < Projects::ApplicationController
     tag = @repository.find_tag(params[:id])
 
     if tag && @repository.rm_tag(tag.name)
-      EventCreateService.new.push_ref(@project, current_user, tag, 'rm', 'refs/tags')
+      EventCreateService.new.push_ref(@project, current_user, tag, 'rm', Gitlab::Git::TAG_REF_PREFIX)
     end
 
     respond_to do |format|

app/mailers/emails/projects.rb

@@ -23,7 +23,7 @@ module Emails
       @compare = compare
       @commits = Commit.decorate(compare.commits)
       @diffs   = compare.diffs
-      @branch  = branch.gsub("refs/heads/", "")
+      @branch  = Gitlab::Git.ref_name(branch)
       @disable_diffs = disable_diffs
 
       @subject = "[#{@project.path_with_namespace}][#{@branch}] "

app/models/event.rb

@@ -190,19 +190,19 @@ class Event < ActiveRecord::Base
   end
 
   def tag?
-    data[:ref]["refs/tags"]
+    Gitlab::Git.tag_ref?(data[:ref])
   end
 
   def branch?
-    data[:ref]["refs/heads"]
+    Gitlab::Git.branch_ref?(data[:ref])
   end
 
   def new_ref?
-    commit_from =~ /^00000/
+    Gitlab::Git.blank_ref?(commit_from)
   end
 
   def rm_ref?
-    commit_to =~ /^00000/
+    Gitlab::Git.blank_ref?(commit_to)
   end
 
   def md_ref?
@@ -226,11 +226,11 @@ class Event < ActiveRecord::Base
   end
 
   def branch_name
-    @branch_name ||= data[:ref].gsub("refs/heads/", "")
+    @branch_name ||= Gitlab::Git.ref_name(data[:ref])
   end
 
   def tag_name
-    @tag_name ||= data[:ref].gsub("refs/tags/", "")
+    @tag_name ||= Gitlab::Git.ref_name(data[:ref])
   end
 
   # Max 20 commits from push DESC

app/models/project_services/asana_service.rb

@@ -77,7 +77,7 @@ automatically inspected. Leave blank to include all branches.'
     end
 
     user = data[:user_name]
-    branch = data[:ref].gsub('refs/heads/', '')
+    branch = Gitlab::Git.ref_name(data[:ref])
 
     branch_restriction = restrict_to_branch.to_s
 

app/models/project_services/campfire_service.rb

@@ -64,7 +64,7 @@ class CampfireService < Service
   end
 
   def build_message(push)
-    ref = push[:ref].gsub("refs/heads/", "")
+    ref = Gitlab::Git.ref_name(push[:ref])
     before = push[:before]
     after = push[:after]
 
@@ -72,9 +72,9 @@ class CampfireService < Service
     message << "[#{project.name_with_namespace}] "
     message << "#{push[:user_name]} "
 
-    if before.include?('000000')
+    if Gitlab::Git.blank_ref?(before)
       message << "pushed new branch #{ref} \n"
-    elsif after.include?('000000')
+    elsif Gitlab::Git.blank_ref?(after)
       message << "removed branch #{ref} \n"
     else
       message << "pushed #{push[:total_commits_count]} commits to #{ref}. "

app/models/project_services/hipchat_service.rb

@@ -79,24 +79,19 @@ class HipchatService < Service
   end
 
   def create_push_message(push)
-    if push[:ref].starts_with?('refs/tags/')
-      ref_type = 'tag'
-      ref = push[:ref].gsub('refs/tags/', '')
-    else
-      ref_type = 'branch'
-      ref = push[:ref].gsub('refs/heads/', '')
-    end
+    ref_type = Gitlab::Git.tag_ref?(push[:ref]) ? 'tag' : 'branch'
+    ref = Gitlab::Git.ref_name(push[:ref])
 
     before = push[:before]
     after = push[:after]
 
     message = ""
     message << "#{push[:user_name]} "
-    if before.include?('000000')
+    if Gitlab::Git.blank_ref?(before)
       message << "pushed new #{ref_type} <a href=\""\
                  "#{project_url}/commits/#{URI.escape(ref)}\">#{ref}</a>"\
                  " to #{project_link}\n"
-    elsif after.include?('000000')
+    elsif Gitlab::Git.blank_ref?(after)
       message << "removed #{ref_type} <b>#{ref}</b> from <a href=\"#{project.web_url}\">#{project_name}</a> \n"
     else
       message << "pushed to #{ref_type} <a href=\""\

app/models/project_services/pushover_service.rb

@@ -88,13 +88,13 @@ class PushoverService < Service
   def execute(data)
     return unless supported_events.include?(data[:object_kind])
 
-    ref = data[:ref].gsub('refs/heads/', '')
+    ref = Gitlab::Git.ref_name(data[:ref])
     before = data[:before]
     after = data[:after]
 
-    if before.include?('000000')
+    if Gitlab::Git.blank_ref?(before)
       message = "#{data[:user_name]} pushed new branch \"#{ref}\"."
-    elsif after.include?('000000')
+    elsif Gitlab::Git.blank_ref?(after)
       message = "#{data[:user_name]} deleted branch \"#{ref}\"."
     else
       message = "#{data[:user_name]} push to branch \"#{ref}\"."

app/models/project_services/slack_service/push_message.rb

@@ -15,13 +15,8 @@ class SlackService
       @commits = params.fetch(:commits, [])
       @project_name = params[:project_name]
       @project_url = params[:project_url]
-      if params[:ref].starts_with?('refs/tags/')
-        @ref_type = 'tag'
-        @ref = params[:ref].gsub('refs/tags/', '')
-      else
-        @ref_type = 'branch'
-        @ref = params[:ref].gsub('refs/heads/', '')
-      end
+      @ref_type = Gitlab::Git.tag_ref?(params[:ref]) ? 'tag' : 'branch'
+      @ref = Gitlab::Git.ref_name(params[:ref])
       @user_name = params[:user_name]
     end
 
@@ -81,11 +76,11 @@ class SlackService
     end
 
     def new_branch?
-      before.include?('000000')
+      Gitlab::Git.blank_ref?(before)
     end
 
     def removed_branch?
-      after.include?('000000')
+      Gitlab::Git.blank_ref?(after)
     end
 
     def branch_url

app/models/project_services/teamcity_service.rb

@@ -132,7 +132,7 @@ class TeamcityService < CiService
       password: password,
     }
 
-    branch = data[:ref].gsub('refs/heads/', '')
+    branch = Gitlab::Git.ref_name(data[:ref])
 
     self.class.post("#{teamcity_url}/httpAuth/app/rest/buildQueue",
                     body: "<build branchName=\"#{branch}\">"\

app/services/create_tag_service.rb

@@ -21,7 +21,7 @@ class CreateTagService < BaseService
     new_tag = repository.find_tag(tag_name)
 
     if new_tag
-      EventCreateService.new.push_ref(project, current_user, new_tag, 'add', 'refs/tags')
+      EventCreateService.new.push_ref(project, current_user, new_tag, 'add', Gitlab::Git::TAG_REF_PREFIX)
 
       push_data = create_push_data(project, current_user, new_tag)
       project.execute_hooks(push_data.dup, :tag_push_hooks)
@@ -41,7 +41,7 @@ class CreateTagService < BaseService
 
   def create_push_data(project, user, tag)
     data = Gitlab::PushDataBuilder.
-      build(project, user, Gitlab::Git::BLANK_SHA, tag.target, 'refs/tags/' + tag.name, [])
+      build(project, user, Gitlab::Git::BLANK_SHA, tag.target, "#{Gitlab::Git::TAG_REF_PREFIX}#{tag.name}", [])
     data[:object_kind] = "tag_push"
     data
   end

app/services/event_create_service.rb

@@ -62,19 +62,19 @@ class EventCreateService
     create_event(project, current_user, Event::CREATED)
   end
 
-  def push_ref(project, current_user, ref, action = 'add', prefix = 'refs/heads')
+  def push_ref(project, current_user, ref, action = 'add', prefix = Gitlab::Git::BRANCH_REF_PREFIX)
     commit = project.repository.commit(ref.target)
 
     if action.to_s == 'add'
-      before = '00000000'
+      before = Gitlab::Git::BLANK_SHA
       after = commit.id
     else
       before = commit.id
-      after = '00000000'
+      after = Gitlab::Git::BLANK_SHA
     end
 
     data = {
-      ref: "#{prefix}/#{ref.name}",
+      ref: "#{prefix}#{ref.name}",
       before: before,
       after: after
     }

app/services/git_push_service.rb

@@ -107,30 +107,24 @@ class GitPushService
   end
 
   def push_to_existing_branch?(ref, oldrev)
-    ref_parts = ref.split('/')
-
     # Return if this is not a push to a branch (e.g. new commits)
-    ref_parts[1].include?('heads') && oldrev != Gitlab::Git::BLANK_SHA
+    Gitlab::Git.branch_ref?(ref) && oldrev != Gitlab::Git::BLANK_SHA
   end
 
   def push_to_new_branch?(ref, oldrev)
-    ref_parts = ref.split('/')
-
-    ref_parts[1].include?('heads') && oldrev == Gitlab::Git::BLANK_SHA
+    Gitlab::Git.branch_ref?(ref) && Gitlab::Git.blank_ref?(oldrev)
   end
 
   def push_remove_branch?(ref, newrev)
-    ref_parts = ref.split('/')
-
-    ref_parts[1].include?('heads') && newrev == Gitlab::Git::BLANK_SHA
+    Gitlab::Git.branch_ref?(ref) && Gitlab::Git.blank_ref?(newrev)
   end
 
   def push_to_branch?(ref)
-    ref.include?('refs/heads')
+    Gitlab::Git.branch_ref?(ref)
   end
 
   def is_default_branch?(ref)
-    ref == "refs/heads/#{project.default_branch}"
+    Gitlab::Git.branch_ref?(ref) && Gitlab::Git.ref_name(ref) == project.default_branch
   end
 
   def commit_user(commit)

app/services/merge_requests/refresh_service.rb

 module MergeRequests
   class RefreshService < MergeRequests::BaseService
     def execute(oldrev, newrev, ref)
-      return true unless ref =~ /heads/
+      return true unless Gitlab::Git.branch_ref?(ref)
 
       @oldrev, @newrev = oldrev, newrev
-      @branch_name = ref.gsub("refs/heads/", "")
+      @branch_name = Gitlab::Git.ref_name(ref)
       @fork_merge_requests = @project.fork_merge_requests.opened
       @commits = @project.repository.commits_between(oldrev, newrev)
 

app/workers/emails_on_push_worker.rb

@@ -8,7 +8,7 @@ class EmailsOnPushWorker
     branch = push_data["ref"]
     author_id = push_data["user_id"]
 
-    if before_sha =~ /^000000/ || after_sha =~ /^000000/
+    if Gitlab::Git.blank_ref?(before_sha) || Gitlab::Git.blank_ref?(after_sha)
       # skip if new branch was pushed or branch was removed
       return true
     end

app/workers/irker_worker.rb

@@ -57,9 +57,9 @@ class IrkerWorker
   end
 
   def send_branch_updates(push_data, project, repo_name, committer, branch)
-    if push_data['before'] =~ /^000000/
+    if push_data['before'] == Gitlab::Git::BLANK_SHA
       send_new_branch project, repo_name, committer, branch
-    elsif push_data['after'] =~ /^000000/
+    elsif push_data['after'] == Gitlab::Git::BLANK_SHA
       send_del_branch repo_name, committer, branch
     end
   end
@@ -83,7 +83,7 @@ class IrkerWorker
     return if push_data['total_commits_count'] == 0
 
     # Next message is for number of commit pushed, if any
-    if push_data['before'] =~ /^000000/
+    if push_data['before'] == Gitlab::Git::BLANK_SHA
       # Tweak on push_data["before"] in order to have a nice compare URL
       push_data['before'] = before_on_new_branch push_data, project
     end

app/workers/post_receive.rb

@@ -33,7 +33,7 @@ class PostReceive
         return false
       end
 
-      if tag?(ref)
+      if Gitlab::Git.tag_ref?(ref)
         GitTagPushService.new.execute(project, @user, oldrev, newrev, ref)
       else
         GitPushService.new.execute(project, @user, oldrev, newrev, ref)
@@ -44,10 +44,4 @@ class PostReceive
   def log(message)
     Gitlab::GitLogger.error("POST-RECEIVE: #{message}")
   end
-
-  private
-
-  def tag?(ref)
-    !!(/refs\/tags\/(.*)/.match(ref))
-  end
 end

lib/gitlab/git.rb

 module Gitlab
   module Git
     BLANK_SHA = '0' * 40
+    TAG_REF_PREFIX = "refs/tags/"
+    BRANCH_REF_PREFIX = "refs/heads/"
 
-    def self.extract_ref_name(ref)
+    class << self
+      def ref_name(ref)
         ref.gsub(/\Arefs\/(tags|heads)\//, '')
       end
+
+      def tag_ref?(ref)
+        ref.start_with?(TAG_REF_PREFIX)
+      end
+
+      def branch_ref?(ref)
+        ref.start_with?(BRANCH_REF_PREFIX)
+      end
+
+      def blank_ref?(ref)
+        ref == BLANK_SHA
+      end
+    end
   end
 end

lib/gitlab/git_access.rb

@@ -115,7 +115,7 @@ module Gitlab
       # we dont allow force push to protected branch
       if forced_push?(project, oldrev, newrev)
         :force_push_code_to_protected_branches
-      elsif newrev == Gitlab::Git::BLANK_SHA
+      elsif Gitlab::Git.blank_ref?(newrev)
         # and we dont allow remove of protected branch
         :remove_protected_branches
       elsif project.developers_can_push_to_protected_branch?(branch_name)
@@ -135,8 +135,8 @@ module Gitlab
 
     def branch_name(ref)
       ref = ref.to_s
-      if ref.start_with?('refs/heads')
-        ref.sub(%r{\Arefs/heads/}, '')
+      if Gitlab::Git.branch_ref?(ref)
+        Gitlab::Git.ref_name(ref)
       else
         nil
       end
@@ -144,8 +144,8 @@ module Gitlab
 
     def tag_name(ref)
       ref = ref.to_s
-      if ref.start_with?('refs/tags')
-        ref.sub(%r{\Arefs/tags/}, '')
+      if Gitlab::Git.tag_ref?(ref)
+        Gitlab::Git.ref_name(ref)
       else
         nil
       end

lib/gitlab/push_data_builder.rb

@@ -65,12 +65,13 @@ module Gitlab
       # existing project and commits to test web hooks
       def build_sample(project, user)
         commits = project.repository.commits(project.default_branch, nil, 3)
-        build(project, user, commits.last.id, commits.first.id, "refs/heads/#{project.default_branch}", commits)
+        ref = "#{Gitlab::Git::BRANCH_REF_PREFIX}#{project.default_branch}"
+        build(project, user, commits.last.id, commits.first.id, ref, commits)
       end
 
       def checkout_sha(repository, newrev, ref)
-        if newrev != Gitlab::Git::BLANK_SHA && ref.start_with?('refs/tags/')
-          tag_name = Gitlab::Git.extract_ref_name(ref)
+        if newrev != Gitlab::Git::BLANK_SHA && Gitlab::Git.tag_ref?(ref)
+          tag_name = Gitlab::Git.ref_name(ref)
           tag = repository.find_tag(tag_name)
 
           if tag

spec/models/project_services/hipchat_service_spec.rb

@@ -63,7 +63,7 @@ describe HipchatService do
     end
 
     context 'tag_push events' do
-      let(:push_sample_data) { Gitlab::PushDataBuilder.build(project, user, '000000', '111111', 'refs/tags/test', []) }
+      let(:push_sample_data) { Gitlab::PushDataBuilder.build(project, user, Gitlab::Git::BLANK_SHA, '1' * 40, 'refs/tags/test', []) }
 
       it "should call Hipchat API for tag push events" do
         hipchat.execute(push_sample_data)

spec/models/project_services/slack_service/push_message_spec.rb

@@ -43,7 +43,7 @@ describe SlackService::PushMessage do
     let(:args) {
       {
           after: 'after',
-          before: '000000',
+          before: Gitlab::Git::BLANK_SHA,
           project_name: 'project_name',
           ref: 'refs/tags/new_tag',
           user_name: 'user_name',
@@ -61,7 +61,7 @@ describe SlackService::PushMessage do
 
   context 'new branch' do
     before do
-      args[:before] = '000000'
+      args[:before] = Gitlab::Git::BLANK_SHA
     end
 
     it 'returns a message regarding a new branch' do
@@ -75,7 +75,7 @@ describe SlackService::PushMessage do
 
   context 'removed branch' do
     before do
-      args[:after] = '000000'
+      args[:after] = Gitlab::Git::BLANK_SHA
     end
 
     it 'returns a message regarding a removed branch' do