Merge branch 'ee-581-backport-changes' into 'master'

app/assets/javascripts/protected_branch_create.js.es6

@@ -44,8 +44,8 @@
 
       // Enable submit button
       const $branchInput = this.$wrap.find('input[name="protected_branch[name]"]');
-      const $allowedToMergeInput = this.$wrap.find('input[name="protected_branch[merge_access_level_attributes][access_level]"]');
-      const $allowedToPushInput = this.$wrap.find('input[name="protected_branch[push_access_level_attributes][access_level]"]');
+      const $allowedToMergeInput = this.$wrap.find('input[name="protected_branch[merge_access_levels_attributes][0][access_level]"]');
+      const $allowedToPushInput = this.$wrap.find('input[name="protected_branch[push_access_levels_attributes][0][access_level]"]');
 
       if ($branchInput.val() && $allowedToMergeInput.val() && $allowedToPushInput.val()){
         this.$form.find('input[type="submit"]').removeAttr('disabled');

app/assets/javascripts/protected_branch_edit.js.es6

@@ -39,12 +39,14 @@
           _method: 'PATCH',
           id: this.$wrap.data('banchId'),
           protected_branch: {
-            merge_access_level_attributes: {
+            merge_access_levels_attributes: [{
+              id: this.$allowedToMergeDropdown.data('access-level-id'),
               access_level: $allowedToMergeInput.val()
-            },
-            push_access_level_attributes: {
+            }],
+            push_access_levels_attributes: [{
+              id: this.$allowedToPushDropdown.data('access-level-id'),
               access_level: $allowedToPushInput.val()
-            }
+            }]
           }
         },
         success: () => {

app/controllers/autocomplete_controller.rb

 class AutocompleteController < ApplicationController
   skip_before_action :authenticate_user!, only: [:users]
+  before_action :load_project, only: [:users]
   before_action :find_users, only: [:users]
 
   def users
@@ -55,11 +56,8 @@ class AutocompleteController < ApplicationController
 
   def find_users
     @users =
-      if params[:project_id].present?
-        project = Project.find(params[:project_id])
-        return render_404 unless can?(current_user, :read_project, project)
-
-        project.team.users
+      if @project
+        @project.team.users
       elsif params[:group_id].present?
         group = Group.find(params[:group_id])
         return render_404 unless can?(current_user, :read_group, group)
@@ -71,4 +69,14 @@ class AutocompleteController < ApplicationController
         User.none
       end
   end
+
+  def load_project
+    @project ||= begin
+      if params[:project_id].present?
+        project = Project.find(params[:project_id])
+        return render_404 unless can?(current_user, :read_project, project)
+        project
+      end
+    end
+  end
 end

app/controllers/projects/protected_branches_controller.rb

@@ -9,16 +9,16 @@ class Projects::ProtectedBranchesController < Projects::ApplicationController
 
   def index
     @protected_branch = @project.protected_branches.new
-    load_protected_branches_gon_variables
+    load_gon_index
   end
 
   def create
-    @protected_branch = ProtectedBranches::CreateService.new(@project, current_user, protected_branch_params).execute
+    @protected_branch = ::ProtectedBranches::CreateService.new(@project, current_user, protected_branch_params).execute
     if @protected_branch.persisted?
       redirect_to namespace_project_protected_branches_path(@project.namespace, @project)
     else
       load_protected_branches
-      load_protected_branches_gon_variables
+      load_gon_index
       render :index
     end
   end
@@ -28,7 +28,7 @@ class Projects::ProtectedBranchesController < Projects::ApplicationController
   end
 
   def update
-    @protected_branch = ProtectedBranches::UpdateService.new(@project, current_user, protected_branch_params).execute(@protected_branch)
+    @protected_branch = ::ProtectedBranches::UpdateService.new(@project, current_user, protected_branch_params).execute(@protected_branch)
 
     if @protected_branch.valid?
       respond_to do |format|
@@ -58,17 +58,23 @@ class Projects::ProtectedBranchesController < Projects::ApplicationController
 
   def protected_branch_params
     params.require(:protected_branch).permit(:name,
-                                             merge_access_level_attributes: [:access_level],
-                                             push_access_level_attributes: [:access_level])
+                                             merge_access_levels_attributes: [:access_level, :id],
+                                             push_access_levels_attributes: [:access_level, :id])
   end
 
   def load_protected_branches
     @protected_branches = @project.protected_branches.order(:name).page(params[:page])
   end
 
-  def load_protected_branches_gon_variables
-    gon.push({ open_branches: @project.open_branches.map { |br| { text: br.name, id: br.name, title: br.name } },
-               push_access_levels: ProtectedBranch::PushAccessLevel.human_access_levels.map { |id, text| { id: id, text: text } },
-               merge_access_levels: ProtectedBranch::MergeAccessLevel.human_access_levels.map { |id, text| { id: id, text: text } } })
+  def access_levels_options
+    {
+      push_access_levels: ProtectedBranch::PushAccessLevel.human_access_levels.map { |id, text| { id: id, text: text, before_divider: true } },
+      merge_access_levels: ProtectedBranch::MergeAccessLevel.human_access_levels.map { |id, text| { id: id, text: text, before_divider: true } }
+    }
+  end
+
+  def load_gon_index
+    params = { open_branches: @project.open_branches.map { |br| { text: br.name, id: br.name, title: br.name } } }
+    gon.push(params.merge(access_levels_options))
   end
 end

app/models/concerns/protected_branch_access.rb

+module ProtectedBranchAccess
+  extend ActiveSupport::Concern
+
+  def humanize
+    self.class.human_access_levels[self.access_level]
+  end
+end

app/models/protected_branch.rb

@@ -5,11 +5,14 @@ class ProtectedBranch < ActiveRecord::Base
   validates :name, presence: true
   validates :project, presence: true
 
-  has_one :merge_access_level, dependent: :destroy
-  has_one :push_access_level, dependent: :destroy
+  has_many :merge_access_levels, dependent: :destroy
+  has_many :push_access_levels, dependent: :destroy
 
-  accepts_nested_attributes_for :push_access_level
-  accepts_nested_attributes_for :merge_access_level
+  validates_length_of :merge_access_levels, is: 1, message: "are restricted to a single instance per protected branch."
+  validates_length_of :push_access_levels, is: 1, message: "are restricted to a single instance per protected branch."
+
+  accepts_nested_attributes_for :push_access_levels
+  accepts_nested_attributes_for :merge_access_levels
 
   def commit
     project.commit(self.name)

app/models/protected_branch/merge_access_level.rb

 class ProtectedBranch::MergeAccessLevel < ActiveRecord::Base
+  include ProtectedBranchAccess
+
   belongs_to :protected_branch
   delegate :project, to: :protected_branch
 
@@ -17,8 +19,4 @@ class ProtectedBranch::MergeAccessLevel < ActiveRecord::Base
 
     project.team.max_member_access(user.id) >= access_level
   end
-
-  def humanize
-    self.class.human_access_levels[self.access_level]
-  end
 end

app/models/protected_branch/push_access_level.rb

 class ProtectedBranch::PushAccessLevel < ActiveRecord::Base
+  include ProtectedBranchAccess
+
   belongs_to :protected_branch
   delegate :project, to: :protected_branch
 
@@ -20,8 +22,4 @@ class ProtectedBranch::PushAccessLevel < ActiveRecord::Base
 
     project.team.max_member_access(user.id) >= access_level
   end
-
-  def humanize
-    self.class.human_access_levels[self.access_level]
-  end
 end

app/services/git_push_service.rb

@@ -91,12 +91,12 @@ class GitPushService < BaseService
 
       params = {
         name: @project.default_branch,
-        push_access_level_attributes: {
+        push_access_levels_attributes: [{
           access_level: current_application_settings.default_branch_protection == PROTECTION_DEV_CAN_PUSH ? Gitlab::Access::DEVELOPER : Gitlab::Access::MASTER
-        },
-        merge_access_level_attributes: {
+        }],
+        merge_access_levels_attributes: [{
           access_level: current_application_settings.default_branch_protection == PROTECTION_DEV_CAN_MERGE ? Gitlab::Access::DEVELOPER : Gitlab::Access::MASTER
-        }
+        }]
       }
 
       ProtectedBranches::CreateService.new(@project, current_user, params).execute

app/services/protected_branches/create_service.rb

@@ -5,23 +5,7 @@ module ProtectedBranches
     def execute
       raise Gitlab::Access::AccessDeniedError unless can?(current_user, :admin_project, project)
 
-      protected_branch = project.protected_branches.new(params)
-
-      ProtectedBranch.transaction do
-        protected_branch.save!
-
-        if protected_branch.push_access_level.blank?
-          protected_branch.create_push_access_level!(access_level: Gitlab::Access::MASTER)
-        end
-
-        if protected_branch.merge_access_level.blank?
-          protected_branch.create_merge_access_level!(access_level: Gitlab::Access::MASTER)
-        end
-      end
-
-      protected_branch
-    rescue ActiveRecord::RecordInvalid
-      protected_branch
+      project.protected_branches.create(params)
     end
   end
 end

app/views/projects/protected_branches/_create_protected_branch.html.haml

@@ -5,6 +5,7 @@
         Protect a branch
     .panel-body
       .form-horizontal
+        = form_errors(@protected_branch)
         .form-group
           = f.label :name, class: 'col-md-2 text-right' do
             Branch:
@@ -18,19 +19,19 @@
               %code production/*
               are supported
         .form-group
-          %label.col-md-2.text-right{ for: 'merge_access_level_attributes' }
+          %label.col-md-2.text-right{ for: 'merge_access_levels_attributes' }
             Allowed to merge:
           .col-md-10
             = dropdown_tag('Select',
                            options: { toggle_class: 'js-allowed-to-merge wide',
-                           data: { field_name: 'protected_branch[merge_access_level_attributes][access_level]', input_id: 'merge_access_level_attributes' }})
+                           data: { field_name: 'protected_branch[merge_access_levels_attributes][0][access_level]', input_id: 'merge_access_levels_attributes' }})
         .form-group
-          %label.col-md-2.text-right{ for: 'push_access_level_attributes' }
+          %label.col-md-2.text-right{ for: 'push_access_levels_attributes' }
             Allowed to push:
           .col-md-10
             = dropdown_tag('Select',
                            options: { toggle_class: 'js-allowed-to-push wide',
-                           data: { field_name: 'protected_branch[push_access_level_attributes][access_level]', input_id: 'push_access_level_attributes' }})
+                           data: { field_name: 'protected_branch[push_access_levels_attributes][0][access_level]', input_id: 'push_access_levels_attributes' }})
 
     .panel-footer
       = f.submit 'Protect', class: 'btn-create btn', disabled: true

app/views/projects/protected_branches/_protected_branch.html.haml

@@ -13,16 +13,9 @@
         = time_ago_with_tooltip(commit.committed_date)
       - else
         (branch was removed from repository)
-  %td
-    = hidden_field_tag "allowed_to_merge_#{protected_branch.id}", protected_branch.merge_access_level.access_level
-    = dropdown_tag( (protected_branch.merge_access_level.humanize || 'Select') ,
-                   options: { toggle_class: 'js-allowed-to-merge', dropdown_class: 'dropdown-menu-selectable js-allowed-to-merge-container',
-                   data: { field_name: "allowed_to_merge_#{protected_branch.id}" }})
-  %td
-    = hidden_field_tag "allowed_to_push_#{protected_branch.id}", protected_branch.push_access_level.access_level
-    = dropdown_tag( (protected_branch.push_access_level.humanize || 'Select') ,
-                   options: { toggle_class: 'js-allowed-to-push', dropdown_class: 'dropdown-menu-selectable js-allowed-to-push-container',
-                   data: { field_name: "allowed_to_push_#{protected_branch.id}" }})
+
+  = render partial: 'update_protected_branch', locals: { protected_branch: protected_branch }
+
   - if can_admin_project
     %td
       = link_to 'Unprotect', [@project.namespace.becomes(Namespace), @project, protected_branch], data: { confirm: 'Branch will be writable for developers. Are you sure?' }, method: :delete, class: 'btn btn-warning'

app/views/projects/protected_branches/_update_protected_branch.html.haml

+%td
+  = hidden_field_tag "allowed_to_merge_#{protected_branch.id}", protected_branch.merge_access_levels.first.access_level
+  = dropdown_tag( (protected_branch.merge_access_levels.first.humanize || 'Select') ,
+                 options: { toggle_class: 'js-allowed-to-merge', dropdown_class: 'dropdown-menu-selectable js-allowed-to-merge-container',
+                 data: { field_name: "allowed_to_merge_#{protected_branch.id}", access_level_id: protected_branch.merge_access_levels.first.id }})
+%td
+  = hidden_field_tag "allowed_to_push_#{protected_branch.id}", protected_branch.push_access_levels.first.access_level
+  = dropdown_tag( (protected_branch.push_access_levels.first.humanize || 'Select') ,
+                 options: { toggle_class: 'js-allowed-to-push', dropdown_class: 'dropdown-menu-selectable js-allowed-to-push-container',
+                 data: { field_name: "allowed_to_push_#{protected_branch.id}", access_level_id: protected_branch.push_access_levels.first.id }})

lib/api/branches.rb

@@ -61,22 +61,27 @@ module API
           name: @branch.name
         }
 
-        unless developers_can_merge.nil?
-          protected_branch_params.merge!({
-            merge_access_level_attributes: {
-              access_level: developers_can_merge ? Gitlab::Access::DEVELOPER : Gitlab::Access::MASTER
-            }
-          })
+        # If `developers_can_merge` is switched off, _all_ `DEVELOPER`
+        # merge_access_levels need to be deleted.
+        if developers_can_merge == false
+          protected_branch.merge_access_levels.where(access_level: Gitlab::Access::DEVELOPER).destroy_all
         end
 
-        unless developers_can_push.nil?
-          protected_branch_params.merge!({
-            push_access_level_attributes: {
-              access_level: developers_can_push ? Gitlab::Access::DEVELOPER : Gitlab::Access::MASTER
-            }
-          })
+        # If `developers_can_push` is switched off, _all_ `DEVELOPER`
+        # push_access_levels need to be deleted.
+        if developers_can_push == false
+          protected_branch.push_access_levels.where(access_level: Gitlab::Access::DEVELOPER).destroy_all
         end
 
+        protected_branch_params.merge!(
+          merge_access_levels_attributes: [{
+            access_level: developers_can_merge ? Gitlab::Access::DEVELOPER : Gitlab::Access::MASTER
+          }],
+          push_access_levels_attributes: [{
+            access_level: developers_can_push ? Gitlab::Access::DEVELOPER : Gitlab::Access::MASTER
+          }]
+        )
+
         if protected_branch
           service = ProtectedBranches::UpdateService.new(user_project, current_user, protected_branch_params)
           service.execute(protected_branch)

lib/api/entities.rb

@@ -129,12 +129,14 @@ module API
 
       expose :developers_can_push do |repo_branch, options|
         project = options[:project]
-        project.protected_branches.matching(repo_branch.name).any? { |protected_branch| protected_branch.push_access_level.access_level == Gitlab::Access::DEVELOPER }
+        access_levels = project.protected_branches.matching(repo_branch.name).map(&:push_access_levels).flatten
+        access_levels.any? { |access_level| access_level.access_level == Gitlab::Access::DEVELOPER }
       end
 
       expose :developers_can_merge do |repo_branch, options|
         project = options[:project]
-        project.protected_branches.matching(repo_branch.name).any? { |protected_branch| protected_branch.merge_access_level.access_level == Gitlab::Access::DEVELOPER }
+        access_levels = project.protected_branches.matching(repo_branch.name).map(&:merge_access_levels).flatten
+        access_levels.any? { |access_level| access_level.access_level == Gitlab::Access::DEVELOPER }
       end
     end
 

lib/gitlab/user_access.rb

@@ -32,7 +32,7 @@ module Gitlab
       if project.protected_branch?(ref)
         return true if project.empty_repo? && project.user_can_push_to_empty_repo?(user)
 
-        access_levels = project.protected_branches.matching(ref).map(&:push_access_level)
+        access_levels = project.protected_branches.matching(ref).map(&:push_access_levels).flatten
         access_levels.any? { |access_level| access_level.check_access(user) }
       else
         user.can?(:push_code, project)
@@ -43,7 +43,7 @@ module Gitlab
       return false unless user
 
       if project.protected_branch?(ref)
-        access_levels = project.protected_branches.matching(ref).map(&:merge_access_level)
+        access_levels = project.protected_branches.matching(ref).map(&:merge_access_levels).flatten
         access_levels.any? { |access_level| access_level.check_access(user) }
       else
         user.can?(:push_code, project)

spec/factories/protected_branches.rb

@@ -3,26 +3,26 @@ FactoryGirl.define do
     name
     project
 
-    after(:create) do |protected_branch|
-      protected_branch.create_push_access_level!(access_level: Gitlab::Access::MASTER)
-      protected_branch.create_merge_access_level!(access_level: Gitlab::Access::MASTER)
+    after(:build) do |protected_branch|
+      protected_branch.push_access_levels.new(access_level: Gitlab::Access::MASTER)
+      protected_branch.merge_access_levels.new(access_level: Gitlab::Access::MASTER)
     end
 
     trait :developers_can_push do
       after(:create) do |protected_branch|
-        protected_branch.push_access_level.update!(access_level: Gitlab::Access::DEVELOPER)
+        protected_branch.push_access_levels.first.update!(access_level: Gitlab::Access::DEVELOPER)
       end
     end
 
     trait :developers_can_merge do
       after(:create) do |protected_branch|
-        protected_branch.merge_access_level.update!(access_level: Gitlab::Access::DEVELOPER)
+        protected_branch.merge_access_levels.first.update!(access_level: Gitlab::Access::DEVELOPER)
       end
     end
 
     trait :no_one_can_push do
       after(:create) do |protected_branch|
-        protected_branch.push_access_level.update!(access_level: Gitlab::Access::NO_ACCESS)
+        protected_branch.push_access_levels.first.update!(access_level: Gitlab::Access::NO_ACCESS)
       end
     end
   end

spec/features/protected_branches_spec.rb

@@ -71,7 +71,10 @@ feature 'Projected Branches', feature: true, js: true do
       project.repository.add_branch(user, 'production-stable', 'master')
       project.repository.add_branch(user, 'staging-stable', 'master')
       project.repository.add_branch(user, 'development', 'master')
-      create(:protected_branch, project: project, name: "*-stable")
+
+      visit namespace_project_protected_branches_path(project.namespace, project)
+      set_protected_branch_name('*-stable')
+      click_on "Protect"
 
       visit namespace_project_protected_branches_path(project.namespace, project)
       click_on "2 matching branches"
@@ -90,13 +93,17 @@ feature 'Projected Branches', feature: true, js: true do
         visit namespace_project_protected_branches_path(project.namespace, project)
         set_protected_branch_name('master')
         within('.new_protected_branch') do
-          find(".js-allowed-to-push").click
-          within(".dropdown.open .dropdown-menu") { click_on access_type_name }
+          allowed_to_push_button = find(".js-allowed-to-push")
+
+          unless allowed_to_push_button.text == access_type_name
+            allowed_to_push_button.click
+            within(".dropdown.open .dropdown-menu") { click_on access_type_name }
+          end
         end
         click_on "Protect"
 
         expect(ProtectedBranch.count).to eq(1)
-        expect(ProtectedBranch.last.push_access_level.access_level).to eq(access_type_id)
+        expect(ProtectedBranch.last.push_access_levels.map(&:access_level)).to eq([access_type_id])
       end
 
       it "allows updating protected branches so that #{access_type_name} can push to them" do
@@ -112,7 +119,7 @@ feature 'Projected Branches', feature: true, js: true do
         end
 
         wait_for_ajax
-        expect(ProtectedBranch.last.push_access_level.access_level).to eq(access_type_id)
+        expect(ProtectedBranch.last.push_access_levels.map(&:access_level)).to include(access_type_id)
       end
     end
 
@@ -121,13 +128,17 @@ feature 'Projected Branches', feature: true, js: true do
         visit namespace_project_protected_branches_path(project.namespace, project)
         set_protected_branch_name('master')
         within('.new_protected_branch') do
-          find(".js-allowed-to-merge").click
-          within(".dropdown.open .dropdown-menu") { click_on access_type_name }
+          allowed_to_merge_button = find(".js-allowed-to-merge")
+
+          unless allowed_to_merge_button.text == access_type_name
+            allowed_to_merge_button.click
+            within(".dropdown.open .dropdown-menu") { click_on access_type_name }
+          end
         end
         click_on "Protect"
 
         expect(ProtectedBranch.count).to eq(1)
-        expect(ProtectedBranch.last.merge_access_level.access_level).to eq(access_type_id)
+        expect(ProtectedBranch.last.merge_access_levels.map(&:access_level)).to eq([access_type_id])
       end
 
       it "allows updating protected branches so that #{access_type_name} can merge to them" do
@@ -143,7 +154,7 @@ feature 'Projected Branches', feature: true, js: true do
         end
 
         wait_for_ajax
-        expect(ProtectedBranch.last.merge_access_level.access_level).to eq(access_type_id)
+        expect(ProtectedBranch.last.merge_access_levels.map(&:access_level)).to include(access_type_id)
       end
     end
   end

spec/models/project_spec.rb

@@ -1089,13 +1089,13 @@ describe Project, models: true do
       let(:project) { create(:project) }
 
       it 'returns true when the branch matches a protected branch via direct match' do
-        project.protected_branches.create!(name: 'foo')
+        create(:protected_branch, project: project, name: "foo")
 
         expect(project.protected_branch?('foo')).to eq(true)
       end
 
       it 'returns true when the branch matches a protected branch via wildcard match' do
-        project.protected_branches.create!(name: 'production/*')
+        create(:protected_branch, project: project, name: "production/*")
 
         expect(project.protected_branch?('production/some-branch')).to eq(true)
       end
@@ -1105,7 +1105,7 @@ describe Project, models: true do
       end
 
       it 'returns false when the branch does not match a protected branch via wildcard match' do
-        project.protected_branches.create!(name: 'production/*')
+        create(:protected_branch, project: project, name: "production/*")
 
         expect(project.protected_branch?('staging/some-branch')).to eq(false)
       end

spec/requests/api/branches_spec.rb

@@ -243,7 +243,7 @@ describe API::API, api: true  do
     end
 
     it "removes protected branch" do
-      project.protected_branches.create(name: branch_name)
+      create(:protected_branch, project: project, name: branch_name)
       delete api("/projects/#{project.id}/repository/branches/#{branch_name}", user)
       expect(response).to have_http_status(405)
       expect(json_response['message']).to eq('Protected branch cant be removed')

spec/services/git_push_service_spec.rb

@@ -227,8 +227,8 @@ describe GitPushService, services: true do
         expect(project.default_branch).to eq("master")
         execute_service(project, user, @blankrev, 'newrev', 'refs/heads/master' )
         expect(project.protected_branches).not_to be_empty
-        expect(project.protected_branches.first.push_access_level.access_level).to eq(Gitlab::Access::MASTER)
-        expect(project.protected_branches.first.merge_access_level.access_level).to eq(Gitlab::Access::MASTER)
+        expect(project.protected_branches.first.push_access_levels.map(&:access_level)).to eq([Gitlab::Access::MASTER])
+        expect(project.protected_branches.first.merge_access_levels.map(&:access_level)).to eq([Gitlab::Access::MASTER])
       end
 
       it "when pushing a branch for the first time with default branch protection disabled" do
@@ -249,8 +249,8 @@ describe GitPushService, services: true do
         execute_service(project, user, @blankrev, 'newrev', 'refs/heads/master' )
 
         expect(project.protected_branches).not_to be_empty
-        expect(project.protected_branches.last.push_access_level.access_level).to eq(Gitlab::Access::DEVELOPER)
-        expect(project.protected_branches.last.merge_access_level.access_level).to eq(Gitlab::Access::MASTER)
+        expect(project.protected_branches.last.push_access_levels.map(&:access_level)).to eq([Gitlab::Access::DEVELOPER])
+        expect(project.protected_branches.last.merge_access_levels.map(&:access_level)).to eq([Gitlab::Access::MASTER])
       end
 
       it "when pushing a branch for the first time with default branch protection set to 'developers can merge'" do
@@ -260,8 +260,8 @@ describe GitPushService, services: true do
         expect(project.default_branch).to eq("master")
         execute_service(project, user, @blankrev, 'newrev', 'refs/heads/master' )
         expect(project.protected_branches).not_to be_empty
-        expect(project.protected_branches.first.push_access_level.access_level).to eq(Gitlab::Access::MASTER)
-        expect(project.protected_branches.first.merge_access_level.access_level).to eq(Gitlab::Access::DEVELOPER)
+        expect(project.protected_branches.first.push_access_levels.map(&:access_level)).to eq([Gitlab::Access::MASTER])
+        expect(project.protected_branches.first.merge_access_levels.map(&:access_level)).to eq([Gitlab::Access::DEVELOPER])
       end
 
       it "when pushing new commits to existing branch" do