diff --git a/CHANGELOG b/CHANGELOG
index 6702ba2ba4..deda7ffc32 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,8 +1,12 @@
+Please view this file on the master branch, on stable branches it's out of date.
+
 v 7.9.0 (unreleased)
   - Move labels/milestones tabs to sidebar
   - Upgrade Rails gem to version 4.1.9.
+  - Improve error messages for file edit failures
   - Improve UI for commits, issues and merge request lists
   - Fix commit comments on first line of diff not rendering in Merge Request Discussion view.
+  - Improve trigger merge request hook when source project branch has been updated (Kirill Zaitsev)
 
 v 7.8.0
   - Fix access control and protection against XSS for note attachments and other uploads.
diff --git a/GITLAB_SHELL_VERSION b/GITLAB_SHELL_VERSION
index aedc15bb0c..fe16b348d9 100644
--- a/GITLAB_SHELL_VERSION
+++ b/GITLAB_SHELL_VERSION
@@ -1 +1 @@
-2.5.3
+2.5.4
diff --git a/Gemfile b/Gemfile
index 233b8c8cd7..093f7bacc0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -247,8 +247,8 @@ group :development, :test do
 
   gem 'jasmine', '2.0.2'
 
-  gem "spring", '1.1.3'
-  gem "spring-commands-rspec", '1.0.1'
+  gem "spring", '1.3.1'
+  gem "spring-commands-rspec", '1.0.4'
   gem "spring-commands-spinach", '1.0.0'
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 34dd709d6b..4bc47836e7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -78,7 +78,7 @@ GEM
       json (>= 1.7)
     celluloid (0.16.0)
       timers (~> 4.0.0)
-    charlock_holmes (0.6.9.4)
+    charlock_holmes (0.7.3)
     cliver (0.3.2)
     coderay (1.1.0)
     coercible (1.0.0)
@@ -543,8 +543,8 @@ GEM
       capybara (>= 2.0.0)
       railties (>= 3)
       spinach (>= 0.4)
-    spring (1.1.3)
-    spring-commands-rspec (1.0.1)
+    spring (1.3.1)
+    spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
     spring-commands-spinach (1.0.0)
       spring (>= 0.9.1)
@@ -742,8 +742,8 @@ DEPENDENCIES
   slack-notifier (~> 1.0.0)
   slim
   spinach-rails
-  spring (= 1.1.3)
-  spring-commands-rspec (= 1.0.1)
+  spring (= 1.3.1)
+  spring-commands-rspec (= 1.0.4)
   spring-commands-spinach (= 1.0.0)
   stamp
   state_machine
diff --git a/app/assets/javascripts/application.js.coffee b/app/assets/javascripts/application.js.coffee
index e9042b5641..c7acde2afe 100644
--- a/app/assets/javascripts/application.js.coffee
+++ b/app/assets/javascripts/application.js.coffee
@@ -16,6 +16,7 @@
 #= require jquery.scrollTo
 #= require jquery.blockUI
 #= require jquery.turbolinks
+#= require jquery.sticky-kit.min
 #= require turbolinks
 #= require autosave
 #= require bootstrap
diff --git a/app/assets/javascripts/diff.js.coffee b/app/assets/javascripts/diff.js.coffee
index 52b4208524..b0b312e774 100644
--- a/app/assets/javascripts/diff.js.coffee
+++ b/app/assets/javascripts/diff.js.coffee
@@ -36,6 +36,8 @@ class @Diff
       )
     )
 
+    $('.diff-header').stick_in_parent(offset_top: $('.navbar').height())
+
   lineNumbers: (line) ->
     return ([0, 0]) unless line.children().length
     lines = line.children().slice(0, 2)
diff --git a/app/assets/javascripts/dispatcher.js.coffee b/app/assets/javascripts/dispatcher.js.coffee
index 1643ca941f..ed1bdd6ca3 100644
--- a/app/assets/javascripts/dispatcher.js.coffee
+++ b/app/assets/javascripts/dispatcher.js.coffee
@@ -26,7 +26,7 @@ class Dispatcher
         new ZenMode()
       when 'projects:milestones:show'
         new Milestone()
-      when 'projects:milestones:new'
+      when 'projects:milestones:new', 'projects:milestones:edit'
         new ZenMode()
       when 'projects:issues:new','projects:issues:edit'
         GitLab.GfmAutoComplete.setup()
@@ -54,6 +54,7 @@ class Dispatcher
       when 'projects:commit:show'
         new Commit()
         new Diff()
+        new ZenMode()
         shortcut_handler = new ShortcutsNavigation()
       when 'projects:commits:show'
         shortcut_handler = new ShortcutsNavigation()
diff --git a/app/assets/stylesheets/sections/nav_sidebar.scss b/app/assets/stylesheets/sections/nav_sidebar.scss
index 17923ca499..8e02b37507 100644
--- a/app/assets/stylesheets/sections/nav_sidebar.scss
+++ b/app/assets/stylesheets/sections/nav_sidebar.scss
@@ -47,7 +47,7 @@
     border-left: 3px solid $style_color;
 
     &.no-highlight {
-      background: none;
+      background: none !important;
       border: none;
     }
 
diff --git a/app/assets/stylesheets/sections/tree.scss b/app/assets/stylesheets/sections/tree.scss
index ff9464e217..60a1c00b04 100644
--- a/app/assets/stylesheets/sections/tree.scss
+++ b/app/assets/stylesheets/sections/tree.scss
@@ -120,13 +120,13 @@
 }
 
 .readme-holder {
-  border-top: 1px dashed #CCC;
-  padding-top: 10px;
-
   .readme-file-title {
     font-size: 14px;
+    font-weight: bold;
     margin-bottom: 20px;
     color: #777;
+    border-bottom: 1px solid #DDD;
+    padding: 10px 0;
   }
 }
 
diff --git a/app/controllers/files_controller.rb b/app/controllers/files_controller.rb
index 9671245d3f..a130bcba9c 100644
--- a/app/controllers/files_controller.rb
+++ b/app/controllers/files_controller.rb
@@ -1,4 +1,6 @@
 class FilesController < ApplicationController
+  skip_before_filter :authenticate_user!, :reject_blocked
+
   def download
     note = Note.find(params[:id])
     uploader = note.attachment
diff --git a/app/controllers/uploads_controller.rb b/app/controllers/uploads_controller.rb
index d587797725..73b124bb34 100644
--- a/app/controllers/uploads_controller.rb
+++ b/app/controllers/uploads_controller.rb
@@ -1,4 +1,7 @@
 class UploadsController < ApplicationController
+  skip_before_filter :authenticate_user!, :reject_blocked
+  before_filter :authorize_access
+
   def show
     model = params[:model].camelize.constantize.find(params[:id])
     uploader = model.send(params[:mounted_as])
@@ -14,4 +17,10 @@ class UploadsController < ApplicationController
       redirect_to uploader.url
     end
   end
+
+  def authorize_access
+    unless params[:mounted_as] == 'avatar'
+      authenticate_user! && reject_blocked
+    end
+  end
 end
diff --git a/app/models/project_services/gitlab_issue_tracker_service.rb b/app/models/project_services/gitlab_issue_tracker_service.rb
index 782cf42ce5..05c048e4e4 100644
--- a/app/models/project_services/gitlab_issue_tracker_service.rb
+++ b/app/models/project_services/gitlab_issue_tracker_service.rb
@@ -27,14 +27,20 @@ class GitlabIssueTrackerService < IssueTrackerService
   end
 
   def project_url
-    namespace_project_issues_path(project.namespace, project)
+    "#{gitlab_url}#{namespace_project_issues_path(project.namespace, project)}"
   end
 
   def new_issue_url
-    new_namespace_project_issue_path namespace_id: project.namespace, project_id: project
+    "#{gitlab_url}#{new_namespace_project_issue_path(namespace_id: project.namespace, project_id: project)}"
   end
 
   def issue_url(iid)
-    "#{Gitlab.config.gitlab.url}#{namespace_project_issue_path(namespace_id: project.namespace, project_id: project, id: iid)}"
+    "#{gitlab_url}#{namespace_project_issue_path(namespace_id: project.namespace, project_id: project, id: iid)}"
+  end
+
+  private
+
+  def gitlab_url
+    Gitlab.config.gitlab.relative_url_root.chomp("/") if Gitlab.config.gitlab.relative_url_root
   end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index 21ccc76978..08ad619a90 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -45,6 +45,7 @@
 #  last_credential_check_at :datetime
 #  github_access_token      :string(255)
 #  notification_email       :string(255)
+#  password_automatically_set :boolean        default(FALSE)
 #
 
 require 'carrierwave/orm/activerecord'
@@ -350,6 +351,10 @@ class User < ActiveRecord::Base
     keys.count == 0
   end
 
+  def require_password?
+    password_automatically_set? && !ldap_user?
+  end
+
   def can_change_username?
     gitlab_config.username_changing_enabled
   end
diff --git a/app/services/base_service.rb b/app/services/base_service.rb
index bb51795df7..52ab29f149 100644
--- a/app/services/base_service.rb
+++ b/app/services/base_service.rb
@@ -37,11 +37,14 @@ class BaseService
 
   private
 
-  def error(message)
-    {
+  def error(message, http_status = nil)
+    result = {
       message: message,
       status: :error
     }
+
+    result[:http_status] = http_status if http_status
+    result
   end
 
   def success
diff --git a/app/services/files/update_service.rb b/app/services/files/update_service.rb
index b4986e1c5c..bcf0e7f3ce 100644
--- a/app/services/files/update_service.rb
+++ b/app/services/files/update_service.rb
@@ -20,17 +20,19 @@ module Files
       end
 
       edit_file_action = Gitlab::Satellite::EditFileAction.new(current_user, project, ref, path)
-      created_successfully = edit_file_action.commit!(
+      edit_file_action.commit!(
         params[:content],
         params[:commit_message],
         params[:encoding]
       )
 
-      if created_successfully
-        success
-      else
-        error("Your changes could not be committed. Maybe the file was changed by another process or there was nothing to commit?")
-      end
+      success
+    rescue Gitlab::Satellite::CheckoutFailed => ex
+      error("Your changes could not be committed because ref '#{ref}' could not be checked out", 400)
+    rescue Gitlab::Satellite::CommitFailed => ex
+      error("Your changes could not be committed. Maybe there was nothing to commit?", 409)
+    rescue Gitlab::Satellite::PushFailed => ex
+      error("Your changes could not be committed. Maybe the file was changed by another process?", 409)
     end
   end
 end
diff --git a/app/services/merge_requests/refresh_service.rb b/app/services/merge_requests/refresh_service.rb
index a6705de61f..96761bec99 100644
--- a/app/services/merge_requests/refresh_service.rb
+++ b/app/services/merge_requests/refresh_service.rb
@@ -53,7 +53,7 @@ module MergeRequests
 
         if merge_request.source_branch == @branch_name || force_push?
           merge_request.reload_code
-          merge_request.mark_as_unchecked
+          update_merge_request(merge_request)
         else
           mr_commit_ids = merge_request.commits.map(&:id)
           push_commit_ids = @commits.map(&:id)
@@ -61,14 +61,20 @@ module MergeRequests
 
           if matches.any?
             merge_request.reload_code
-            merge_request.mark_as_unchecked
+            update_merge_request(merge_request)
           else
-            merge_request.mark_as_unchecked
+            update_merge_request(merge_request)
           end
         end
       end
     end
 
+    def update_merge_request(merge_request)
+      MergeRequests::UpdateService.new(
+        merge_request.target_project,
+        @current_user, merge_status: 'unchecked').execute(merge_request)
+    end
+
     # Add comment about pushing new commits to merge requests
     def comment_mr_with_commits
       merge_requests = @project.origin_merge_requests.opened.where(source_branch: @branch_name).to_a
diff --git a/app/views/layouts/_head_panel.html.haml b/app/views/layouts/_head_panel.html.haml
index 77bfe4f996..d5928d2ed2 100644
--- a/app/views/layouts/_head_panel.html.haml
+++ b/app/views/layouts/_head_panel.html.haml
@@ -42,7 +42,7 @@
             = link_to destroy_user_session_path, class: "logout", method: :delete, title: "Logout", class: 'has_bottom_tooltip', 'data-original-title' => 'Logout'  do
               %i.fa.fa-sign-out
           %li.hidden-xs
-            = link_to current_user, class: "profile-pic", id: 'profile-pic' do
+            = link_to current_user, class: "profile-pic has_bottom_tooltip", id: 'profile-pic', 'data-original-title' => 'Your profile' do
               = image_tag avatar_icon(current_user.email, 60), alt: 'User activity'
 
 = render 'shared/outdated_browser'
diff --git a/app/views/layouts/nav/_project.html.haml b/app/views/layouts/nav/_project.html.haml
index 4d859e817a..15b489c7d9 100644
--- a/app/views/layouts/nav/_project.html.haml
+++ b/app/views/layouts/nav/_project.html.haml
@@ -6,12 +6,7 @@
         %span
           Back to project
 
-    = nav_link(html_options: {class: "#{project_tab_class} separate-item"}) do
-      = link_to edit_namespace_project_path(@project.namespace, @project), title: 'Settings', class: "stat-tab tab no-highlight" do
-        %i.fa.fa-cogs
-        %span
-          Settings
-          %i.fa.fa-angle-down
+    %li.separate-item
 
     = render 'projects/settings_nav'
 
@@ -98,4 +93,3 @@
           %i.fa.fa-cogs
           %span
             Settings
-            %i.fa.fa-angle-down
diff --git a/app/views/shared/_clone_panel.html.haml b/app/views/shared/_clone_panel.html.haml
index df0bde7698..a1121750ca 100644
--- a/app/views/shared/_clone_panel.html.haml
+++ b/app/views/shared/_clone_panel.html.haml
@@ -9,7 +9,7 @@
       :"data-container" => "body"}
       SSH
     %button{ |
-      class: "btn #{ 'active' if default_clone_protocol == 'http' }#{ ' has_tooltip' if current_user && current_user.password_automatically_set? }", |
+      class: "btn #{ 'active' if default_clone_protocol == 'http' }#{ ' has_tooltip' if current_user && current_user.require_password? }", |
       :"data-clone" => project.http_url_to_repo, |
       :"data-title" => "Set a password on your account<br> to pull or push via #{gitlab_config.protocol.upcase}",
       :"data-html" => "true",
diff --git a/app/views/shared/_no_password.html.haml b/app/views/shared/_no_password.html.haml
index 022097cda1..a43bf33751 100644
--- a/app/views/shared/_no_password.html.haml
+++ b/app/views/shared/_no_password.html.haml
@@ -1,4 +1,4 @@
-- if cookies[:hide_no_password_message].blank? && !current_user.hide_no_password && current_user.password_automatically_set?
+- if cookies[:hide_no_password_message].blank? && !current_user.hide_no_password && current_user.require_password?
   .no-password-message.alert.alert-warning.hidden-xs
     You won't be able to pull or push project code via #{gitlab_config.protocol.upcase} until you #{link_to 'set a password', edit_profile_password_path} on your account
 
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 25b082b98d..2d5e7addcd 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -5,7 +5,7 @@ Gitlab::Application.configure do
   # test suite. You never need to work with it otherwise. Remember that
   # your test database is "scratch space" for the test suite and is wiped
   # and recreated between test runs. Don't rely on the data there!
-  config.cache_classes = true
+  config.cache_classes = false
 
   # Configure static asset server for tests with Cache-Control for performance
   config.serve_static_assets = true
diff --git a/config/routes.rb b/config/routes.rb
index f0979eac90..ecd439aece 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -86,9 +86,9 @@ Gitlab::Application.routes.draw do
         constraints:  { model: /note|user|group|project/, mounted_as: /avatar|attachment/, filename: /.+/ }
 
     # Project markdown uploads
-    get ":id/:secret/:filename",
-        to:           "projects/uploads#show",
-        constraints:  { id: /[a-zA-Z.0-9_\-]+\/[a-zA-Z.0-9_\-]+/, filename: /.+/ }
+    get ":namespace_id/:id/:secret/:filename",
+      to:           "projects/uploads#show",
+      constraints:  { namespace_id: /[a-zA-Z.0-9_\-]+/, id: /[a-zA-Z.0-9_\-]+/, filename: /.+/ }
   end
 
   #
@@ -269,16 +269,23 @@ Gitlab::Application.routes.draw do
         post '/preview/*id', to: 'blob#preview', constraints: { id: /.+/ }, as: 'preview_blob'
 
         scope do
-          get('/blob/*id/diff',
-              to: 'blob#diff',
-              constraints: { id: /.+/, format: false },
-              as: :blob_diff)
-          get('/blob/*id',
-              to: 'blob#show',
-              constraints: { id: /.+/, format: false }, as: :blob)
-          delete('/blob/*id',
-                 to: 'blob#destroy',
-                 constraints: { id: /.+/, format: false })
+          get(
+            '/blob/*id/diff',
+            to: 'blob#diff',
+            constraints: { id: /.+/, format: false },
+            as: :blob_diff
+          )
+          get(
+            '/blob/*id',
+            to: 'blob#show',
+            constraints: { id: /.+/, format: false },
+            as: :blob
+          )
+          delete(
+            '/blob/*id',
+            to: 'blob#destroy',
+            constraints: { id: /.+/, format: false }
+          )
         end
 
         scope do
diff --git a/db/migrate/20140907220153_serialize_service_properties.rb b/db/migrate/20140907220153_serialize_service_properties.rb
index bd75ab1eac..d45a10465b 100644
--- a/db/migrate/20140907220153_serialize_service_properties.rb
+++ b/db/migrate/20140907220153_serialize_service_properties.rb
@@ -1,6 +1,9 @@
 class SerializeServiceProperties < ActiveRecord::Migration
   def change
-    add_column :services, :properties, :text
+    unless column_exists?(:services, :properties)
+      add_column :services, :properties, :text
+    end
+
     Service.reset_column_information
 
     associations =
@@ -19,18 +22,21 @@ class SerializeServiceProperties < ActiveRecord::Migration
                                :api_version, :jira_issue_transition_id],
     }
 
-    Service.all.each do |service|
+    Service.find_each(batch_size: 500).each do |service|
       associations[service.type.to_sym].each do |attribute|
         service.send("#{attribute}=", service.attributes[attribute.to_s])
       end
-      service.save
+
+      service.save(validate: false)
     end
 
-    remove_column :services, :project_url, :string
-    remove_column :services, :subdomain, :string
-    remove_column :services, :room, :string
-    remove_column :services, :recipients, :text
-    remove_column :services, :api_key, :string
-    remove_column :services, :token, :string
+    if column_exists?(:services, :project_url)
+      remove_column :services, :project_url, :string
+      remove_column :services, :subdomain, :string
+      remove_column :services, :room, :string
+      remove_column :services, :recipients, :text
+      remove_column :services, :api_key, :string
+      remove_column :services, :token, :string
+    end
   end
 end
diff --git a/doc/install/installation.md b/doc/install/installation.md
index f5dcec2f61..28597fd39d 100644
--- a/doc/install/installation.md
+++ b/doc/install/installation.md
@@ -141,7 +141,7 @@ We recommend using a PostgreSQL database. For MySQL check [MySQL setup guide](da
 
     # Try connecting to the new database with the new user
     sudo -u git -H psql -d gitlabhq_production
-    
+
     # Quit the database session
     gitlabhq_production> \q
 
@@ -280,7 +280,7 @@ We recommend using a PostgreSQL database. For MySQL check [MySQL setup guide](da
 GitLab Shell is an SSH access and repository management software developed specially for GitLab.
 
     # Run the installation task for gitlab-shell (replace `REDIS_URL` if needed):
-    sudo -u git -H bundle exec rake gitlab:shell:install[v2.4.3] REDIS_URL=unix:/var/run/redis/redis.sock RAILS_ENV=production
+    sudo -u git -H bundle exec rake gitlab:shell:install[v2.5.4] REDIS_URL=unix:/var/run/redis/redis.sock RAILS_ENV=production
 
     # By default, the gitlab-shell config is generated from your main GitLab config.
     # You can review (and modify) the gitlab-shell config as follows:
diff --git a/doc/update/6.x-or-7.x-to-7.8.md b/doc/update/6.x-or-7.x-to-7.8.md
index 859f4c1a6d..673d9253d6 100644
--- a/doc/update/6.x-or-7.x-to-7.8.md
+++ b/doc/update/6.x-or-7.x-to-7.8.md
@@ -123,7 +123,7 @@ sudo apt-get install libkrb5-dev
 ```bash
 cd /home/git/gitlab-shell
 sudo -u git -H git fetch
-sudo -u git -H git checkout v2.4.3
+sudo -u git -H git checkout v2.5.4
 ```
 
 ## 7. Install libs, migrations, etc.
@@ -163,7 +163,7 @@ git diff 6-0-stable:config/gitlab.yml.example 7-8-stable:config/gitlab.yml.examp
 
 * Make `/home/git/gitlab/config/gitlab.yml` the same as https://gitlab.com/gitlab-org/gitlab-ce/blob/7-8-stable/config/gitlab.yml.example but with your settings.
 * Make `/home/git/gitlab/config/unicorn.rb` the same as https://gitlab.com/gitlab-org/gitlab-ce/blob/7-8-stable/config/unicorn.rb.example but with your settings.
-* Make `/home/git/gitlab-shell/config.yml` the same as https://gitlab.com/gitlab-org/gitlab-shell/blob/v2.4.3/config.yml.example but with your settings.
+* Make `/home/git/gitlab-shell/config.yml` the same as https://gitlab.com/gitlab-org/gitlab-shell/blob/v2.5.4/config.yml.example but with your settings.
 * Copy rack attack middleware config
 
 ```bash
@@ -179,7 +179,7 @@ sudo cp lib/support/logrotate/gitlab /etc/logrotate.d/gitlab
 ### Change Nginx settings
 
 * HTTP setups: Make `/etc/nginx/sites-available/gitlab` the same as https://gitlab.com/gitlab-org/gitlab-ce/blob/7-8-stable/lib/support/nginx/gitlab but with your settings.
-* HTTPS setups: Make `/etc/nginx/sites-available/gitlab-ssl` the same as https://gitlab.com/gitlab-org/gitlab-ce/blob/7-8-stablef/lib/support/nginx/gitlab-ssl but with your settings.
+* HTTPS setups: Make `/etc/nginx/sites-available/gitlab-ssl` the same as https://gitlab.com/gitlab-org/gitlab-ce/blob/7-8-stable/lib/support/nginx/gitlab-ssl but with your settings.
 * A new `location /uploads/` section has been added that needs to have the same content as the existing `location @gitlab` section.
 
 ## 9. Start application
diff --git a/doc/update/7.7-to-7.8.md b/doc/update/7.7-to-7.8.md
index a8a5c7f66c..46ca163c1b 100644
--- a/doc/update/7.7-to-7.8.md
+++ b/doc/update/7.7-to-7.8.md
@@ -37,7 +37,7 @@ sudo -u git -H git checkout 7-8-stable-ee
 ```bash
 cd /home/git/gitlab-shell
 sudo -u git -H git fetch
-sudo -u git -H git checkout v2.5.3
+sudo -u git -H git checkout v2.5.4
 ```
 
 ### 4. Install libs, migrations, etc.
@@ -102,7 +102,7 @@ If all items are green, then congratulations upgrade is complete!
 
 ### 8. GitHub settings (if applicable)
 
-If you are using GitHub as an OAuth provider for authentication, you should change the callback URL so that it 
+If you are using GitHub as an OAuth provider for authentication, you should change the callback URL so that it
 only contains a root URL (ex. `https://gitlab.example.com/`)
 
 ## Things went south? Revert to previous version (7.7)
diff --git a/features/steps/shared/project_tab.rb b/features/steps/shared/project_tab.rb
index 6aa4f1b20d..c5aed19331 100644
--- a/features/steps/shared/project_tab.rb
+++ b/features/steps/shared/project_tab.rb
@@ -41,6 +41,8 @@ module SharedProjectTab
   end
 
   step 'the active main tab should be Settings' do
-    ensure_active_main_tab('Settings')
+    within '.nav-sidebar' do
+      page.should have_content('Back to project')
+    end
   end
 end
diff --git a/lib/api/files.rb b/lib/api/files.rb
index e6e71bac36..3176ef0e25 100644
--- a/lib/api/files.rb
+++ b/lib/api/files.rb
@@ -117,7 +117,8 @@ module API
             branch_name: branch_name
           }
         else
-          render_api_error!(result[:message], 400)
+          http_status = result[:http_status] || 400
+          render_api_error!(result[:message], http_status)
         end
       end
 
diff --git a/lib/gitlab/satellite/files/edit_file_action.rb b/lib/gitlab/satellite/files/edit_file_action.rb
index 2834b722b2..82d71ab990 100644
--- a/lib/gitlab/satellite/files/edit_file_action.rb
+++ b/lib/gitlab/satellite/files/edit_file_action.rb
@@ -15,7 +15,11 @@ module Gitlab
           prepare_satellite!(repo)
 
           # create target branch in satellite at the corresponding commit from bare repo
-          repo.git.checkout({ raise: true, timeout: true, b: true }, ref, "origin/#{ref}")
+          begin
+            repo.git.checkout({ raise: true, timeout: true, b: true }, ref, "origin/#{ref}")
+          rescue Grit::Git::CommandFailed => ex
+            log_and_raise(CheckoutFailed, ex.message)
+          end
 
           # update the file in the satellite's working dir
           file_path_in_satellite = File.join(repo.working_dir, file_path)
@@ -31,19 +35,31 @@ module Gitlab
 
           # commit the changes
           # will raise CommandFailed when commit fails
-          repo.git.commit(raise: true, timeout: true, a: true, m: commit_message)
+          begin
+            repo.git.commit(raise: true, timeout: true, a: true, m: commit_message)
+          rescue Grit::Git::CommandFailed => ex
+            log_and_raise(CommitFailed, ex.message)
+          end
 
 
           # push commit back to bare repo
           # will raise CommandFailed when push fails
-          repo.git.push({ raise: true, timeout: true }, :origin, ref)
+          begin
+            repo.git.push({ raise: true, timeout: true }, :origin, ref)
+          rescue Grit::Git::CommandFailed => ex
+            log_and_raise(PushFailed, ex.message)
+          end
 
           # everything worked
           true
         end
-      rescue Grit::Git::CommandFailed => ex
-        Gitlab::GitLogger.error(ex.message)
-        false
+      end
+
+      private
+
+      def log_and_raise(errorClass, message)
+        Gitlab::GitLogger.error(message)
+        raise(errorClass, message)
       end
     end
   end
diff --git a/lib/gitlab/satellite/satellite.rb b/lib/gitlab/satellite/satellite.rb
index 62d1bb364d..70125d539d 100644
--- a/lib/gitlab/satellite/satellite.rb
+++ b/lib/gitlab/satellite/satellite.rb
@@ -1,5 +1,9 @@
 module Gitlab
   module Satellite
+    class CheckoutFailed < StandardError; end
+    class CommitFailed < StandardError; end
+    class PushFailed < StandardError; end
+
     class Satellite
       include Gitlab::Popen
 
diff --git a/spec/helpers/gitlab_markdown_helper_spec.rb b/spec/helpers/gitlab_markdown_helper_spec.rb
index 68269ad25a..76fcf888a6 100644
--- a/spec/helpers/gitlab_markdown_helper_spec.rb
+++ b/spec/helpers/gitlab_markdown_helper_spec.rb
@@ -474,7 +474,7 @@ describe GitlabMarkdownHelper do
 
       # First issue link
       expect(groups[1]).
-        to match(/href="#{namespace_project_issue_url(project.namespace, project, issues[0])}"/)
+        to match(/href="#{namespace_project_issue_path(project.namespace, project, issues[0])}"/)
       expect(groups[1]).to match(/##{issues[0].iid}$/)
 
       # Internal commit link
@@ -483,7 +483,7 @@ describe GitlabMarkdownHelper do
 
       # Second issue link
       expect(groups[3]).
-        to match(/href="#{namespace_project_issue_url(project.namespace, project, issues[1])}"/)
+        to match(/href="#{namespace_project_issue_path(project.namespace, project, issues[1])}"/)
       expect(groups[3]).to match(/##{issues[1].iid}$/)
 
       # Trailing commit link
@@ -611,7 +611,7 @@ describe GitlabMarkdownHelper do
     end
 
     it "should generate absolute urls for refs" do
-      expect(markdown("##{issue.iid}")).to include(namespace_project_issue_url(project.namespace, project, issue))
+      expect(markdown("##{issue.iid}")).to include(namespace_project_issue_path(project.namespace, project, issue))
     end
 
     it "should generate absolute urls for emoji" do
diff --git a/spec/models/project_services/gitlab_issue_tracker_service_spec.rb b/spec/models/project_services/gitlab_issue_tracker_service_spec.rb
new file mode 100644
index 0000000000..c474f4a2d9
--- /dev/null
+++ b/spec/models/project_services/gitlab_issue_tracker_service_spec.rb
@@ -0,0 +1,60 @@
+# == Schema Information
+#
+# Table name: services
+#
+#  id         :integer          not null, primary key
+#  type       :string(255)
+#  title      :string(255)
+#  project_id :integer
+#  created_at :datetime
+#  updated_at :datetime
+#  active     :boolean          default(FALSE), not null
+#  properties :text
+#  template   :boolean          default(FALSE)
+#
+require 'spec_helper'
+
+describe GitlabIssueTrackerService do
+  describe "Associations" do
+    it { is_expected.to belong_to :project }
+    it { is_expected.to have_one :service_hook }
+  end
+
+
+  describe 'project and issue urls' do
+    let(:project) { create(:project) }
+
+    context 'with absolute urls' do
+      before do
+        @service = project.create_gitlab_issue_tracker_service(active: true)
+      end
+
+      after do
+        @service.destroy!
+      end
+
+      it 'should give the correct path' do
+        expect(@service.project_url).to eq("/#{project.path_with_namespace}/issues")
+        expect(@service.new_issue_url).to eq("/#{project.path_with_namespace}/issues/new")
+        expect(@service.issue_url(432)).to eq("/#{project.path_with_namespace}/issues/432")
+      end
+    end
+
+    context 'with enabled relative urls' do
+      before do
+        Settings.gitlab.stub(:relative_url_root).and_return("/gitlab/root")
+        @service = project.create_gitlab_issue_tracker_service(active: true)
+      end
+
+      after do
+        @service.destroy!
+      end
+
+      it 'should give the correct path' do
+        expect(@service.project_url).to eq("/gitlab/root/#{project.path_with_namespace}/issues")
+        expect(@service.new_issue_url).to eq("/gitlab/root/#{project.path_with_namespace}/issues/new")
+        expect(@service.issue_url(432)).to eq("/gitlab/root/#{project.path_with_namespace}/issues/432")
+      end
+    end
+  end
+end
diff --git a/spec/requests/api/files_spec.rb b/spec/requests/api/files_spec.rb
index cfac7d289e..bab8888a63 100644
--- a/spec/requests/api/files_spec.rb
+++ b/spec/requests/api/files_spec.rb
@@ -98,13 +98,33 @@ describe API::API, api: true  do
       expect(response.status).to eq(400)
     end
 
-    it "should return a 400 if satellite fails to create file" do
-      Gitlab::Satellite::EditFileAction.any_instance.stub(
-        commit!: false,
-      )
+    it 'should return a 400 if the checkout fails' do
+      Gitlab::Satellite::EditFileAction.any_instance.stub(:commit!)
+        .and_raise(Gitlab::Satellite::CheckoutFailed)
 
       put api("/projects/#{project.id}/repository/files", user), valid_params
       expect(response.status).to eq(400)
+
+      ref = valid_params[:branch_name]
+      expect(response.body).to match("ref '#{ref}' could not be checked out")
+    end
+
+    it 'should return a 409 if the file was not modified' do
+      Gitlab::Satellite::EditFileAction.any_instance.stub(:commit!)
+        .and_raise(Gitlab::Satellite::CommitFailed)
+
+      put api("/projects/#{project.id}/repository/files", user), valid_params
+      expect(response.status).to eq(409)
+      expect(response.body).to match("Maybe there was nothing to commit?")
+    end
+
+    it 'should return a 409 if the push fails' do
+      Gitlab::Satellite::EditFileAction.any_instance.stub(:commit!)
+        .and_raise(Gitlab::Satellite::PushFailed)
+
+      put api("/projects/#{project.id}/repository/files", user), valid_params
+      expect(response.status).to eq(409)
+      expect(response.body).to match("Maybe the file was changed by another process?")
     end
   end
 
diff --git a/vendor/assets/javascripts/jquery.sticky-kit.min.js b/vendor/assets/javascripts/jquery.sticky-kit.min.js
new file mode 100644
index 0000000000..e8bb207c5a
--- /dev/null
+++ b/vendor/assets/javascripts/jquery.sticky-kit.min.js
@@ -0,0 +1,9 @@
+/*
+ Sticky-kit v1.1.1 | WTFPL | Leaf Corcoran 2014 | http://leafo.net
+*/
+(function(){var k,e;k=this.jQuery||window.jQuery;e=k(window);k.fn.stick_in_parent=function(d){var v,y,n,p,h,C,s,G,q,H;null==d&&(d={});s=d.sticky_class;y=d.inner_scrolling;C=d.recalc_every;h=d.parent;p=d.offset_top;n=d.spacer;v=d.bottoming;null==p&&(p=0);null==h&&(h=void 0);null==y&&(y=!0);null==s&&(s="is_stuck");null==v&&(v=!0);G=function(a,d,q,z,D,t,r,E){var u,F,m,A,c,f,B,w,x,g,b;if(!a.data("sticky_kit")){a.data("sticky_kit",!0);f=a.parent();null!=h&&(f=f.closest(h));if(!f.length)throw"failed to find stick parent";
+u=m=!1;(g=null!=n?n&&a.closest(n):k("<div />"))&&g.css("position",a.css("position"));B=function(){var c,e,l;if(!E&&(c=parseInt(f.css("border-top-width"),10),e=parseInt(f.css("padding-top"),10),d=parseInt(f.css("padding-bottom"),10),q=f.offset().top+c+e,z=f.height(),m&&(u=m=!1,null==n&&(a.insertAfter(g),g.detach()),a.css({position:"",top:"",width:"",bottom:""}).removeClass(s),l=!0),D=a.offset().top-parseInt(a.css("margin-top"),10)-p,t=a.outerHeight(!0),r=a.css("float"),g&&g.css({width:a.outerWidth(!0),
+height:t,display:a.css("display"),"vertical-align":a.css("vertical-align"),"float":r}),l))return b()};B();if(t!==z)return A=void 0,c=p,x=C,b=function(){var b,k,l,h;if(!E&&(null!=x&&(--x,0>=x&&(x=C,B())),l=e.scrollTop(),null!=A&&(k=l-A),A=l,m?(v&&(h=l+t+c>z+q,u&&!h&&(u=!1,a.css({position:"fixed",bottom:"",top:c}).trigger("sticky_kit:unbottom"))),l<D&&(m=!1,c=p,null==n&&("left"!==r&&"right"!==r||a.insertAfter(g),g.detach()),b={position:"",width:"",top:""},a.css(b).removeClass(s).trigger("sticky_kit:unstick")),
+y&&(b=e.height(),t+p>b&&!u&&(c-=k,c=Math.max(b-t,c),c=Math.min(p,c),m&&a.css({top:c+"px"})))):l>D&&(m=!0,b={position:"fixed",top:c},b.width="border-box"===a.css("box-sizing")?a.outerWidth()+"px":a.width()+"px",a.css(b).addClass(s),null==n&&(a.after(g),"left"!==r&&"right"!==r||g.append(a)),a.trigger("sticky_kit:stick")),m&&v&&(null==h&&(h=l+t+c>z+q),!u&&h)))return u=!0,"static"===f.css("position")&&f.css({position:"relative"}),a.css({position:"absolute",bottom:d,top:"auto"}).trigger("sticky_kit:bottom")},
+w=function(){B();return b()},F=function(){E=!0;e.off("touchmove",b);e.off("scroll",b);e.off("resize",w);k(document.body).off("sticky_kit:recalc",w);a.off("sticky_kit:detach",F);a.removeData("sticky_kit");a.css({position:"",bottom:"",top:"",width:""});f.position("position","");if(m)return null==n&&("left"!==r&&"right"!==r||a.insertAfter(g),g.remove()),a.removeClass(s)},e.on("touchmove",b),e.on("scroll",b),e.on("resize",w),k(document.body).on("sticky_kit:recalc",w),a.on("sticky_kit:detach",F),setTimeout(b,
+0)}};q=0;for(H=this.length;q<H;q++)d=this[q],G(k(d));return this}}).call(this);