Revert "Merge branch 'drop-satellites'"

This reverts commit 957e849f, reversing
changes made to 6b9dbe9f.
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Gemfile.lock

@@ -875,4 +875,4 @@ DEPENDENCIES
   wikicloth (= 0.8.1)
 
 BUNDLED WITH
-   1.10.4
+   1.10.5

app/assets/javascripts/merge_request_widget.js.coffee

@@ -19,7 +19,7 @@ class @MergeRequestWidget
           when 'merged'
             location.reload()
           else
-            setTimeout(merge_request_widget.mergeInProgress, 2000)
+            setTimeout(merge_request_widget.mergeInProgress, 3000)
       dataType: 'json'
 
   getMergeStatus: ->

app/controllers/projects/compare_controller.rb

@@ -13,8 +13,13 @@ class Projects::CompareController < Projects::ApplicationController
     base_ref = Addressable::URI.unescape(params[:from])
     @ref = head_ref = Addressable::URI.unescape(params[:to])
 
-    compare_result = CompareService.new.
-      execute(@project, head_ref, @project, base_ref)
+    compare_result = CompareService.new.execute(
+      current_user,
+      @project,
+      head_ref,
+      @project,
+      base_ref
+    )
 
     @commits = compare_result.commits
     @diffs = compare_result.diffs

app/controllers/projects/merge_requests_controller.rb

+require 'gitlab/satellite/satellite'
+
 class Projects::MergeRequestsController < Projects::ApplicationController
   before_action :module_enabled
   before_action :merge_request, only: [
-    :edit, :update, :show, :diffs, :commits, :merge, :merge_check,
+    :edit, :update, :show, :diffs, :commits, :automerge, :automerge_check,
     :ci_status, :toggle_subscription
   ]
   before_action :closes_issues, only: [:edit, :update, :show, :diffs, :commits]
@@ -135,7 +137,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     end
   end
 
-  def merge_check
+  def automerge_check
     if @merge_request.unchecked?
       @merge_request.check_if_can_be_merged
     end
@@ -145,11 +147,11 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     render partial: "projects/merge_requests/widget/show.html.haml", layout: false
   end
 
-  def merge
+  def automerge
     return access_denied! unless @merge_request.can_be_merged_by?(current_user)
 
-    if @merge_request.mergeable?
-      MergeWorker.perform_async(@merge_request.id, current_user.id, params)
+    if @merge_request.automergeable?
+      AutoMergeWorker.perform_async(@merge_request.id, current_user.id, params)
       @status = true
     else
       @status = false

app/models/merge_request.rb

@@ -41,6 +41,8 @@ class MergeRequest < ActiveRecord::Base
 
   delegate :commits, :diffs, :last_commit, :last_commit_short_sha, to: :merge_request_diff, prefix: nil
 
+  attr_accessor :should_remove_source_branch
+
   # When this attribute is true some MR validation is ignored
   # It allows us to close or modify broken merge requests
   attr_accessor :allow_broken
@@ -55,7 +57,7 @@ class MergeRequest < ActiveRecord::Base
       transition [:reopened, :opened] => :closed
     end
 
-    event :mark_as_merged do
+    event :merge do
       transition [:reopened, :opened, :locked] => :merged
     end
 
@@ -204,7 +206,11 @@ class MergeRequest < ActiveRecord::Base
 
   def check_if_can_be_merged
     can_be_merged =
-      project.repository.can_be_merged?(source_sha, target_branch)
+      if for_fork?
+        Gitlab::Satellite::MergeAction.new(self.author, self).can_be_merged?
+      else
+        project.repository.can_be_merged?(source_branch, target_branch)
+      end
 
     if can_be_merged
       mark_as_mergeable
@@ -221,6 +227,18 @@ class MergeRequest < ActiveRecord::Base
     self.target_project.events.where(target_id: self.id, target_type: "MergeRequest", action: Event::CLOSED).last
   end
 
+  def automerge!(current_user, commit_message = nil)
+    return unless automergeable?
+
+    MergeRequests::AutoMergeService.
+      new(target_project, current_user).
+      execute(self, commit_message)
+  end
+
+  def remove_source_branch?
+    self.should_remove_source_branch && !self.source_project.root_ref?(self.source_branch) && !self.for_fork?
+  end
+
   def open?
     opened? || reopened?
   end
@@ -229,11 +247,11 @@ class MergeRequest < ActiveRecord::Base
     title =~ /\A\[?WIP\]?:? /i
   end
 
-  def mergeable?
+  def automergeable?
     open? && !work_in_progress? && can_be_merged?
   end
 
-  def gitlab_merge_status
+  def automerge_status
     if work_in_progress?
       "work_in_progress"
     else
@@ -260,14 +278,14 @@ class MergeRequest < ActiveRecord::Base
   #
   # see "git diff"
   def to_diff(current_user)
-    target_project.repository.diff_text(target_branch, source_sha)
+    Gitlab::Satellite::MergeAction.new(current_user, self).diff_in_satellite
   end
 
   # Returns the commit as a series of email patches.
   #
   # see "git format-patch"
   def to_patch(current_user)
-    target_project.repository.format_patch(target_branch, source_sha)
+    Gitlab::Satellite::MergeAction.new(current_user, self).format_patch
   end
 
   def hook_attrs
@@ -418,30 +436,4 @@ class MergeRequest < ActiveRecord::Base
       "Open"
     end
   end
-
-  def target_sha
-    @target_sha ||= target_project.
-      repository.commit(target_branch).sha
-  end
-
-  def source_sha
-    commits.first.sha
-  end
-
-  def fetch_ref
-    target_project.repository.fetch_ref(
-      source_project.repository.path_to_repo,
-      "refs/heads/#{source_branch}",
-      "refs/merge-requests/#{id}/head"
-    )
-  end
-
-  def in_locked_state
-    begin
-      lock_mr
-      yield
-    ensure
-      unlock_mr if locked?
-    end
-  end
 end

app/models/merge_request_diff.rb

@@ -16,8 +16,9 @@ require Rails.root.join("app/models/commit")
 class MergeRequestDiff < ActiveRecord::Base
   include Sortable
 
-  # Prevent store of diff if commits amount more then 500
-  COMMITS_SAFE_SIZE = 500
+  # Prevent store of diff
+  # if commits amount more then 200
+  COMMITS_SAFE_SIZE = 200
 
   attr_reader :commits, :diffs
 
@@ -123,12 +124,12 @@ class MergeRequestDiff < ActiveRecord::Base
     if new_diffs.any?
       if new_diffs.size > Commit::DIFF_HARD_LIMIT_FILES
         self.state = :overflow_diff_files_limit
-        new_diffs = new_diffs.first[Commit::DIFF_HARD_LIMIT_LINES]
+        new_diffs = []
       end
 
       if new_diffs.sum { |diff| diff.diff.lines.count } > Commit::DIFF_HARD_LIMIT_LINES
         self.state = :overflow_diff_lines_limit
-        new_diffs = new_diffs.first[Commit::DIFF_HARD_LIMIT_LINES]
+        new_diffs = []
       end
     end
 
@@ -159,21 +160,12 @@ class MergeRequestDiff < ActiveRecord::Base
   private
 
   def compare_result
-    @compare_result ||=
-      begin
-        # Update ref if merge request is from fork
-        merge_request.fetch_ref if merge_request.for_fork?
-
-        # Get latest sha of branch from source project
-        source_sha = merge_request.source_project.commit(source_branch).sha
-
-        Gitlab::CompareResult.new(
-          Gitlab::Git::Compare.new(
-            merge_request.target_project.repository.raw_repository,
+    @compare_result ||= CompareService.new.execute(
+      merge_request.author,
+      merge_request.source_project,
+      merge_request.source_branch,
+      merge_request.target_project,
       merge_request.target_branch,
-            source_sha,
-          )
     )
   end
-  end
 end

app/models/namespace.rb

@@ -118,11 +118,12 @@ class Namespace < ActiveRecord::Base
     gitlab_shell.add_namespace(path_was)
 
     if gitlab_shell.mv_namespace(path_was, path)
-      # If repositories moved successfully we need to
-      # send update instructions to users.
+      # If repositories moved successfully we need to remove old satellites
+      # and send update instructions to users.
       # However we cannot allow rollback since we moved namespace dir
       # So we basically we mute exceptions in next actions
       begin
+        gitlab_shell.rm_satellites(path_was)
         send_update_instructions
       rescue
         # Returning false does not rollback after_* transaction but gives

app/models/project.rb

@@ -520,6 +520,14 @@ class Project < ActiveRecord::Base
     !repository.exists? || repository.empty?
   end
 
+  def ensure_satellite_exists
+    self.satellite.create unless self.satellite.exists?
+  end
+
+  def satellite
+    @satellite ||= Gitlab::Satellite::Satellite.new(self)
+  end
+
   def repo
     repository.raw
   end
@@ -589,11 +597,14 @@ class Project < ActiveRecord::Base
     new_path_with_namespace = File.join(namespace_dir, path)
 
     if gitlab_shell.mv_repository(old_path_with_namespace, new_path_with_namespace)
-      # If repository moved successfully we need to send update instructions to users.
+      # If repository moved successfully we need to remove old satellite
+      # and send update instructions to users.
       # However we cannot allow rollback since we moved repository
       # So we basically we mute exceptions in next actions
       begin
         gitlab_shell.mv_repository("#{old_path_with_namespace}.wiki", "#{new_path_with_namespace}.wiki")
+        gitlab_shell.rm_satellites(old_path_with_namespace)
+        ensure_satellite_exists
         send_move_instructions
         reset_events_cache
       rescue
@@ -691,6 +702,7 @@ class Project < ActiveRecord::Base
   def create_repository
     if forked?
       if gitlab_shell.fork_repository(forked_from_project.path_with_namespace, self.namespace.path)
+        ensure_satellite_exists
         true
       else
         errors.add(:base, 'Failed to fork repository via gitlab-shell')

app/models/project_services/gitlab_ci_service.rb

@@ -74,8 +74,6 @@ class GitlabCiService < CiService
     else
       :error
     end
-  rescue Errno::ECONNREFUSED
-    :error
   end
 
   def fork_registration(new_project, private_token)
@@ -105,8 +103,6 @@ class GitlabCiService < CiService
     if response.code == 200 and response["coverage"]
       response["coverage"]
     end
-  rescue Errno::ECONNREFUSED
-    nil
   end
 
   def build_page(sha, ref)

app/models/repository.rb

@@ -411,36 +411,15 @@ class Repository
     }
   end
 
-  def can_be_merged?(source_sha, target_branch)
+  def can_be_merged?(source_branch, target_branch)
     our_commit = rugged.branches[target_branch].target
-    their_commit = rugged.lookup(source_sha)
+    their_commit = rugged.branches[source_branch].target
 
     if our_commit && their_commit
       !rugged.merge_commits(our_commit, their_commit).conflicts?
-    else
-      false
     end
   end
 
-  def merge(source_sha, target_branch, options = {})
-    our_commit = rugged.branches[target_branch].target
-    their_commit = rugged.lookup(source_sha)
-
-    raise "Invalid merge target" if our_commit.nil?
-    raise "Invalid merge source" if their_commit.nil?
-
-    merge_index = rugged.merge_commits(our_commit, their_commit)
-    return false if merge_index.conflicts?
-
-    actual_options = options.merge(
-      parents: [our_commit, their_commit],
-      tree: merge_index.write_tree(rugged),
-      update_ref: "refs/heads/#{target_branch}"
-    )
-
-    Rugged::Commit.create(rugged, actual_options)
-  end
-
   def search_files(query, ref)
     offset = 2
     args = %W(git grep -i -n --before-context #{offset} --after-context #{offset} #{query} #{ref || root_ref})
@@ -474,11 +453,6 @@ class Repository
     )
   end
 
-  def fetch_ref(source_path, source_ref, target_ref)
-    args = %W(git fetch #{source_path} #{source_ref}:#{target_ref})
-    Gitlab::Popen.popen(args, path_to_repo)
-  end
-
   private
 
   def cache

app/services/base_service.rb

@@ -31,10 +31,6 @@ class BaseService
     SystemHooksService.new
   end
 
-  def repository
-    project.repository
-  end
-
   # Add an error to the specified model for restricted visibility levels
   def deny_visibility_level(model, denied_visibility_level = nil)
     denied_visibility_level ||= model.visibility_level

app/services/compare_service.rb

-require 'securerandom'
-
 # Compare 2 branches for one repo or between repositories
 # and return Gitlab::CompareResult object that responds to commits and diffs
 class CompareService
-  def execute(source_project, source_branch, target_project, target_branch)
-    source_sha = source_project.commit(source_branch).sha
-
-    # If compare with other project we need to fetch ref first
-    unless target_project == source_project
-      random_string = SecureRandom.hex
-
-      target_project.repository.fetch_ref(
-        source_project.repository.path_to_repo,
-        "refs/heads/#{source_branch}",
-        "refs/tmp/#{random_string}/head"
-      )
-    end
-
+  def execute(current_user, source_project, source_branch, target_project, target_branch)
+    # Try to compare branches to get commits list and diffs
+    #
+    # Note: Use satellite only when need to compare between two repos
+    # because satellites are slower than operations on bare repo
+    if target_project == source_project
       Gitlab::CompareResult.new(
         Gitlab::Git::Compare.new(
           target_project.repository.raw_repository,
           target_branch,
-        source_sha,
+          source_branch,
         )
       )
+    else
+      Gitlab::Satellite::CompareAction.new(
+        current_user,
+        target_project,
+        target_branch,
+        source_project,
+        source_branch
+      ).result
+    end
   end
 end

app/services/files/base_service.rb

@@ -33,8 +33,15 @@ module Files
 
     private
 
+    def repository
+      project.repository
+    end
+
     def after_commit(sha, branch)
-      PostCommitService.new(project, current_user).execute(sha, branch)
+      commit = repository.commit(sha)
+      full_ref = "#{Gitlab::Git::BRANCH_REF_PREFIX}#{branch}"
+      old_sha = commit.parent_id || Gitlab::Git::BLANK_SHA
+      GitPushService.new.execute(project, current_user, old_sha, sha, full_ref)
     end
 
     def current_branch

app/services/git_push_service.rb

@@ -10,14 +10,16 @@ class GitPushService
   #
   # Next, this method:
   #  1. Creates the push event
-  #  2. Updates merge requests
-  #  3. Recognizes cross-references from commit messages
-  #  4. Executes the project's web hooks
-  #  5. Executes the project's services
+  #  2. Ensures that the project satellite exists
+  #  3. Updates merge requests
+  #  4. Recognizes cross-references from commit messages
+  #  5. Executes the project's web hooks
+  #  6. Executes the project's services
   #
   def execute(project, user, oldrev, newrev, ref)
     @project, @user = project, user
 
+    project.ensure_satellite_exists
     project.repository.expire_cache
 
     if push_remove_branch?(ref, newrev)

app/services/merge_requests/auto_merge_service.rb

+module MergeRequests
+  # AutoMergeService class
+  #
+  # Do git merge in satellite and in case of success
+  # mark merge request as merged and execute all hooks and notifications
+  # Called when you do merge via GitLab UI
+  class AutoMergeService < BaseMergeService
+    attr_reader :merge_request, :commit_message
+
+    def execute(merge_request, commit_message)
+      @commit_message = commit_message
+      @merge_request = merge_request
+
+      merge_request.lock_mr
+
+      if merge!
+        merge_request.merge
+        create_merge_event(merge_request, current_user)
+        create_note(merge_request)
+        notification_service.merge_mr(merge_request, current_user)
+        execute_hooks(merge_request, 'merge')
+        true
+      else
+        merge_request.unlock_mr
+        false
+      end
+    rescue
+      merge_request.unlock_mr if merge_request.locked?
+      merge_request.mark_as_unmergeable
+      false
+    end
+
+    def merge!
+      if merge_request.for_fork?
+        Gitlab::Satellite::MergeAction.new(current_user, merge_request).merge!(commit_message)
+      else
+        # Merge local branches using rugged instead of satellites
+        if sha = commit
+          after_commit(sha, merge_request.target_branch)
+
+          if merge_request.remove_source_branch?
+            DeleteBranchService.new(merge_request.source_project, current_user).execute(merge_request.source_branch)
+          end
+
+          true
+        else
+          false
+        end
+      end
+    end
+
+    def commit
+      committer = repository.user_to_comitter(current_user)
+
+      options = {
+        message: commit_message,
+        author: committer,
+        committer: committer
+      }
+
+      repository.merge(merge_request.source_branch, merge_request.target_branch, options)
+    end
+
+    def after_commit(sha, branch)
+      commit = repository.commit(sha)
+      full_ref = "#{Gitlab::Git::BRANCH_REF_PREFIX}#{branch}"
+      old_sha = commit.parent_id || Gitlab::Git::BLANK_SHA
+      GitPushService.new.execute(project, current_user, old_sha, sha, full_ref)
+    end
+
+    def repository
+      project.repository
+    end
+  end
+end

app/services/merge_requests/base_merge_service.rb

+module MergeRequests
+  class BaseMergeService < MergeRequests::BaseService
+
+    private
+
+    def create_merge_event(merge_request, current_user)
+      EventCreateService.new.merge_mr(merge_request, current_user)
+    end
+  end
+end

app/services/merge_requests/build_service.rb

@@ -12,16 +12,12 @@ module MergeRequests
       merge_request.target_project ||= (project.forked_from_project || project)
       merge_request.target_branch ||= merge_request.target_project.default_branch
 
-      if merge_request.target_branch.blank? || merge_request.source_branch.blank?
-        message =
-          if params[:source_branch] || params[:target_branch]
-            "You must select source and target branch"
-          end
-
-        return build_failed(merge_request, message)
+      unless merge_request.target_branch && merge_request.source_branch
+        return build_failed(merge_request, nil)
       end
 
       compare_result = CompareService.new.execute(
+        current_user,
         merge_request.source_project,
         merge_request.source_branch,
         merge_request.target_project,
@@ -44,6 +40,7 @@ module MergeRequests
           merge_request.compare_diffs = diffs
 
         elsif diffs == false
+          # satellite timeout return false
           merge_request.can_be_created = false
           merge_request.compare_failed = true
         end
@@ -62,6 +59,9 @@ module MergeRequests
       end
 
       merge_request
+
+    rescue Gitlab::Satellite::BranchesWithoutParent
+      return build_failed(merge_request, "Selected branches have no common commit so they cannot be merged.")
     end
 
     def build_failed(merge_request, message)

app/services/merge_requests/merge_service.rb

 module MergeRequests
   # MergeService class
   #
-  # Do git merge and in case of success
-  # mark merge request as merged and execute all hooks and notifications
-  # Executed when you do merge via GitLab UI
-  #
-  class MergeService < MergeRequests::BaseService
-    attr_reader :merge_request, :commit_message
-
+  # Mark existing merge request as merged
+  # and execute all hooks and notifications
+  # Called when you do merge via command line and push code
+  # to target branch
+  class MergeService < BaseMergeService
     def execute(merge_request, commit_message)
-      @commit_message = commit_message
-      @merge_request = merge_request
-
-      unless @merge_request.mergeable?
-        return error('Merge request is not mergeable')
-      end
-
-      merge_request.in_locked_state do
-        if merge_changes
-          after_merge
-          success
-        else
-          error('Can not merge changes')
-        end
-      end
-    end
-
-    private
+      merge_request.merge
 
-    def merge_changes
-      if sha = commit
-        after_commit(sha, merge_request.target_branch)
-      end
-    end
-
-    def commit
-      committer = repository.user_to_comitter(current_user)
-
-      options = {
-        message: commit_message,
-        author: committer,
-        committer: committer
-      }
-
-      repository.merge(merge_request.source_sha, merge_request.target_branch, options)
-    end
-
-    def after_commit(sha, branch)
-      PostCommitService.new(project, current_user).execute(sha, branch)
-    end
+      create_merge_event(merge_request, current_user)
+      create_note(merge_request)
+      notification_service.merge_mr(merge_request, current_user)
+      execute_hooks(merge_request, 'merge')
 
-    def after_merge
-      MergeRequests::PostMergeService.new(project, current_user).execute(merge_request)
+      true
+    rescue
+      false
     end
   end
 end

app/services/merge_requests/post_merge_service.rb

-module MergeRequests
-  # PostMergeService class
-  #
-  # Mark existing merge request as merged
-  # and execute all hooks and notifications
-  #
-  class PostMergeService < MergeRequests::BaseService
-    def execute(merge_request)
-      merge_request.mark_as_merged
-      create_merge_event(merge_request, current_user)
-      create_note(merge_request)
-      notification_service.merge_mr(merge_request, current_user)
-      execute_hooks(merge_request, 'merge')
-    end
-
-    private
-
-    def create_merge_event(merge_request, current_user)
-      EventCreateService.new.merge_mr(merge_request, current_user)
-    end
-  end
-end

app/services/merge_requests/refresh_service.rb

@@ -33,9 +33,9 @@ module MergeRequests
 
 
       merge_requests.uniq.select(&:source_project).each do |merge_request|
-        MergeRequests::PostMergeService.
+        MergeRequests::MergeService.
           new(merge_request.target_project, @current_user).
-          execute(merge_request)
+          execute(merge_request, nil)
       end
     end
 

app/services/post_commit_service.rb

-class PostCommitService < BaseService
-  include Gitlab::Popen
-
-  attr_reader :changes, :repo_path
-
-  def execute(sha, branch)
-    commit = repository.commit(sha)
-    full_ref = Gitlab::Git::BRANCH_REF_PREFIX + branch
-    old_sha = commit.parent_id || Gitlab::Git::BLANK_SHA
-    @changes = "#{old_sha} #{sha} #{full_ref}"
-    @repo_path = repository.path_to_repo
-
-    post_receive
-  end
-
-  private
-
-  def post_receive
-    hook = hook_file('post-receive', repo_path)
-    return true if hook.nil?
-    call_receive_hook(hook)
-  end
-
-  def call_receive_hook(hook)
-    # function  will return true if succesful
-    exit_status = false
-
-    vars = {
-      'GL_ID' => Gitlab::ShellEnv.gl_id(current_user),
-      'PWD' => repo_path
-    }
-
-    options = {
-      chdir: repo_path
-    }
-
-    # we combine both stdout and stderr as we don't know what stream
-    # will be used by the custom hook
-    Open3.popen2e(vars, hook, options) do |stdin, stdout_stderr, wait_thr|
-      exit_status = true
-      stdin.sync = true
-
-      # in git, pre- and post- receive hooks may just exit without
-      # reading stdin. We catch the exception to avoid a broken pipe
-      # warning
-      begin
-        # inject all the changes as stdin to the hook
-        changes.lines do |line|
-          stdin.puts line
-        end
-      rescue Errno::EPIPE
-      end
-
-      # need to close stdin before reading stdout
-      stdin.close
-
-      # only output stdut_stderr if scripts doesn't return 0
-      unless wait_thr.value == 0
-        exit_status = false
-      end
-    end
-
-    exit_status
-  end
-
-  def hook_file(hook_type, repo_path)
-    hook_path = File.join(repo_path.strip, 'hooks')
-    hook_file = "#{hook_path}/#{hook_type}"
-    hook_file if File.exist?(hook_file)
-  end
-end

app/services/projects/destroy_service.rb

@@ -27,6 +27,7 @@ module Projects
         end
       end
 
+      project.satellite.destroy
       log_info("Project \"#{project.name}\" was removed")
       system_hook_service.execute_hooks_for(project, :destroy)
       true

app/services/projects/transfer_service.rb

@@ -33,6 +33,9 @@ module Projects
           raise TransferError.new("Project with same path in target namespace already exists")
         end
 
+        # Remove old satellite
+        project.satellite.destroy
+
         # Apply new namespace id
         project.namespace = new_namespace
         project.save!
@@ -48,6 +51,9 @@ module Projects
         # Move wiki repo also if present
         gitlab_shell.mv_repository("#{old_path}.wiki", "#{new_path}.wiki")
 
+        # Create a new satellite (reload project from DB)
+        Project.find(project.id).ensure_satellite_exists
+
         # clear project cached events
         project.reset_events_cache
 

app/views/projects/merge_requests/_new_compare.html.haml

@@ -35,7 +35,7 @@
     - if @merge_request.compare_failed
       .alert.alert-danger
         %h4 Compare failed
-        %p We can't compare selected branches. It may be because of huge diff. Please try again or select different branches.
+        %p We can't compare selected branches. It may be because of huge diff or satellite timeout. Please try again or select different branches.
     - else
       .light-well
         .center

app/views/projects/merge_requests/_new_submit.html.haml

@@ -24,7 +24,7 @@
         = icon('history')
         Commits
         %span.badge= @commits.size
-    %li.diffs-tab.active
+    %li.diffs-tab
       = link_to url_for(params), data: {target: '#diffs', action: 'diffs', toggle: 'tab'} do
         = icon('list-alt')
         Changes
@@ -33,7 +33,7 @@
   .tab-content
     #commits.commits.tab-pane
       = render "projects/commits/commits", project: @project
-    #diffs.diffs.tab-pane.active
+    #diffs.diffs.tab-pane
       - if @diffs.present?
         = render "projects/diffs/diffs", diffs: @diffs, project: @project
       - elsif @commits.size > MergeRequestDiff::COMMITS_SAFE_SIZE

app/views/projects/merge_requests/widget/_open.html.haml

@@ -3,6 +3,8 @@
   .mr-widget-body
     - if @project.archived?
       = render 'projects/merge_requests/widget/open/archived'
+    - elsif !@project.satellite.exists?
+      = render 'projects/merge_requests/widget/open/no_satellite'
     - elsif @merge_request.commits.blank?
       = render 'projects/merge_requests/widget/open/nothing'
     - elsif @merge_request.branch_missing?

app/views/projects/merge_requests/widget/_show.html.haml

@@ -11,10 +11,10 @@
   var merge_request_widget;
 
   merge_request_widget = new MergeRequestWidget({
-    url_to_automerge_check: "#{merge_check_namespace_project_merge_request_path(@project.namespace, @project, @merge_request)}",
+    url_to_automerge_check: "#{automerge_check_namespace_project_merge_request_path(@project.namespace, @project, @merge_request)}",
     check_enable: #{@merge_request.unchecked? ? "true" : "false"},
     url_to_ci_check: "#{ci_status_namespace_project_merge_request_path(@project.namespace, @project, @merge_request)}",
     ci_enable: #{@project.ci_service ? "true" : "false"},
-    current_status: "#{@merge_request.gitlab_merge_status}",
+    current_status: "#{@merge_request.automerge_status}",
   });
 

app/views/projects/merge_requests/widget/open/_accept.html.haml

-= form_for [:merge, @project.namespace.becomes(Namespace), @project, @merge_request], remote: true, method: :post, html: { class: 'accept-mr-form js-requires-input' } do |f|
+= form_for [:automerge, @project.namespace.becomes(Namespace), @project, @merge_request], remote: true, method: :post, html: { class: 'accept-mr-form js-requires-input' } do |f|
   = hidden_field_tag :authenticity_token, form_authenticity_token
   .accept-merge-holder.clearfix.js-toggle-container
     .accept-action

app/views/projects/merge_requests/widget/open/_no_satellite.html.haml

+%p
+  %span
+    %strong This repository does not have a satellite. Please ask an administrator to fix this issue!

app/workers/merge_worker.rb → app/workers/auto_merge_worker.rb

-class MergeWorker
+class AutoMergeWorker
   include Sidekiq::Worker
 
   sidekiq_options queue: :default
@@ -7,13 +7,7 @@ class MergeWorker
     params = params.with_indifferent_access
     current_user = User.find(current_user_id)
     merge_request = MergeRequest.find(merge_request_id)
-
-    result = MergeRequests::MergeService.new(merge_request.target_project, current_user).
-      execute(merge_request, params[:commit_message])
-
-    if result[:status] == :success && params[:should_remove_source_branch].present?
-      DeleteBranchService.new(merge_request.source_project, current_user).
-        execute(merge_request.source_branch)
-    end
+    merge_request.should_remove_source_branch = params[:should_remove_source_branch]
+    merge_request.automerge!(current_user, params[:commit_message])
   end
 end

app/workers/repository_import_worker.rb

@@ -27,6 +27,7 @@ class RepositoryImportWorker
 
     project.import_finish
     project.save
+    project.satellite.create unless project.satellite.exists?
     ProjectCacheWorker.perform_async(project.id)
     Gitlab::BitbucketImport::KeyDeleter.new(project).execute if project.import_type == 'bitbucket'
   end

config/routes.rb

@@ -463,8 +463,8 @@ Gitlab::Application.routes.draw do
           member do
             get :diffs
             get :commits
-            post :merge
-            get :merge_check
+            post :automerge
+            get :automerge_check
             get :ci_status
             post :toggle_subscription
           end

doc/development/architecture.md

@@ -56,9 +56,9 @@ To serve repositories over SSH there's an add-on application called gitlab-shell
 
 A typical install of GitLab will be on GNU/Linux. It uses Nginx or Apache as a web front end to proxypass the Unicorn web server. By default, communication between Unicorn and the front end is via a Unix domain socket but forwarding requests via TCP is also supported. The web front end accesses `/home/git/gitlab/public` bypassing the Unicorn server to serve static pages, uploads (e.g. avatar images or attachments), and precompiled assets. GitLab serves web pages and a [GitLab API](https://gitlab.com/gitlab-org/gitlab-ce/tree/master/doc/api) using the Unicorn web server. It uses Sidekiq as a job queue which, in turn, uses redis as a non-persistent database backend for job information, meta data, and incoming jobs.
 
-The GitLab web app uses MySQL or PostgreSQL for persistent database information (e.g. users, permissions, issues, other meta data). GitLab stores the bare git repositories it serves in `/home/git/repositories` by default. It also keeps default branch and hook information with the bare repository.
+The GitLab web app uses MySQL or PostgreSQL for persistent database information (e.g. users, permissions, issues, other meta data). GitLab stores the bare git repositories it serves in `/home/git/repositories` by default. It also keeps default branch and hook information with the bare repository. `/home/git/gitlab-satellites` keeps checked out repositories when performing actions such as a merge request, editing files in the web interface, etc.
 
-When serving repositories over HTTP/HTTPS GitLab utilizes the GitLab API to resolve authorization and access as well as serving git objects.
+The satellite repository is used by the web interface for editing repositories and the wiki which is also a git repository. When serving repositories over HTTP/HTTPS GitLab utilizes the GitLab API to resolve authorization and access as well as serving git objects.
 
 The add-on component gitlab-shell serves repositories over SSH. It manages the SSH keys within `/home/git/.ssh/authorized_keys` which should not be manually edited. gitlab-shell accesses the bare repositories directly to serve git objects and communicates with redis to submit jobs to Sidekiq for GitLab to process. gitlab-shell queries the GitLab API to determine authorization and access.
 
@@ -129,7 +129,7 @@ Note: `/home/git/` is shorthand for `/home/git`.
 
 gitlabhq (includes Unicorn and Sidekiq logs)
 
-- `/home/git/gitlab/log/` contains `application.log`, `production.log`, `sidekiq.log`, `unicorn.stdout.log`, `githost.log` and `unicorn.stderr.log` normally.
+- `/home/git/gitlab/log/` contains `application.log`, `production.log`, `sidekiq.log`, `unicorn.stdout.log`, `githost.log`, `satellites.log`, and `unicorn.stderr.log` normally.
 
 gitlab-shell
 

doc/install/installation.md

@@ -216,6 +216,10 @@ We recommend using a PostgreSQL database. For MySQL check [MySQL setup guide](da
     sudo chmod -R u+rwX,go-w log/
     sudo chmod -R u+rwX tmp/
 
+    # Create directory for satellites
+    sudo -u git -H mkdir /home/git/gitlab-satellites
+    sudo chmod u+rwx,g=rx,o-rwx /home/git/gitlab-satellites
+
     # Make sure GitLab can write to the tmp/pids/ and tmp/sockets/ directories
     sudo chmod -R u+rwX tmp/pids/
     sudo chmod -R u+rwX tmp/sockets/

doc/install/requirements.md

@@ -40,7 +40,7 @@ We love [JRuby](http://jruby.org/) and [Rubinius](http://rubini.us/) but GitLab
 
 ### Storage
 
-The necessary hard drive space largely depends on the size of the repos you want to store in GitLab but as a *rule of thumb* you should have at least as much free space as all your repos combined take up. 
+The necessary hard drive space largely depends on the size of the repos you want to store in GitLab but as a *rule of thumb* you should have at least twice as much free space as all your repos combined take up. You need twice the storage because [GitLab satellites](structure.md) contain an extra copy of each repo.
 
 If you want to be flexible about growing your hard drive space in the future consider mounting it using LVM so you can add more hard drives when you need them.
 

doc/install/structure.md

@@ -6,14 +6,16 @@ This is the directory structure you will end up with following the instructions
     |   |-- git
     |       |-- .ssh
     |       |-- gitlab
+    |       |-- gitlab-satellites
     |       |-- gitlab-shell
     |       |-- repositories
 
 * `/home/git/.ssh` - contains openssh settings.  Specifically the `authorized_keys` file managed by gitlab-shell.
 * `/home/git/gitlab` - GitLab core software.
+* `/home/git/gitlab-satellites` - checked out repositories for merge requests and file editing from web UI.  This can be treated as a temporary files directory.
 * `/home/git/gitlab-shell` - Core add-on component of GitLab.  Maintains SSH cloning and other functionality.
 * `/home/git/repositories` - bare repositories for all projects organized by namespace.  This is where the git repositories which are pushed/pulled are maintained for all projects.  **This area is critical data for projects.  [Keep a backup](../raketasks/backup_restore.md)**
 
-*Note: the default locations for repositories can be configured in `config/gitlab.yml` of GitLab and `config.yml` of gitlab-shell.*
+*Note: the default locations for gitlab-satellites and repositories can be configured in `config/gitlab.yml` of GitLab and `config.yml` of gitlab-shell.*
 
 To see a more in-depth overview see the [GitLab architecture doc](../development/architecture.md).

doc/logs/logs.md

@@ -51,6 +51,16 @@ December 03, 2014 13:20 -> ERROR -> Command failed [1]: /usr/bin/git --git-dir=/
 error: failed to push some refs to '/Users/vsizov/gitlab-development-kit/repositories/gitlabhq/gitlab_git.git'
 ```
 
+#### satellites.log
+This file lives in `/var/log/gitlab/gitlab-rails/satellites.log` for omnibus package or in `/home/git/gitlab/log/satellites.log` for installations from the source.
+
+In some cases GitLab should perform write actions to git repository, for example when it is needed to merge the merge request or edit a file with online editor. If something went wrong you can look into this file to find out what exactly happened.
+```
+October 07, 2014 11:36: Failed to create satellite for Chesley Weimann III / project1817
+October 07, 2014 11:36: PID: 1872: git clone /Users/vsizov/gitlab-development-kit/gitlab/tmp/tests/repositories/conrad6841/gitlabhq.git /Users/vsizov/gitlab-development-kit/gitlab/tmp/tests/gitlab-satellites/conrad6841/gitlabhq
+October 07, 2014 11:36: PID: 1872: -> fatal: repository '/Users/vsizov/gitlab-development-kit/gitlab/tmp/tests/repositories/conrad6841/gitlabhq.git' does not exist
+```
+
 #### sidekiq.log
 This file lives in `/var/log/gitlab/gitlab-rails/sidekiq.log` for omnibus package or in `/home/git/gitlab/log/sidekiq.log` for installations from the source.
 

doc/raketasks/maintenance.md

@@ -105,11 +105,24 @@ Log directory writable? ... yes
 Tmp directory writable? ... yes
 Init script exists? ... yes
 Init script up-to-date? ... yes
+Projects have satellites? ... yes
 Redis version >= 2.0.0? ... yes
 
 Checking GitLab ... Finished
 ```
 
+## (Re-)Create satellite repositories
+
+This will create satellite repositories for all your projects.
+
+If necessary, remove the `repo_satellites` directory and rerun the commands below.
+
+```
+sudo -u git -H mkdir -p /home/git/gitlab-satellites
+sudo -u git -H bundle exec rake gitlab:satellites:create RAILS_ENV=production
+sudo chmod u+rwx,g=rx,o-rwx /home/git/gitlab-satellites
+```
+
 ## Rebuild authorized_keys file
 
 In some case it is necessary to rebuild the `authorized_keys` file.

features/steps/dashboard/help.rb

@@ -16,6 +16,6 @@ class Spinach::Features::DashboardHelp < Spinach::FeatureSteps
   end
 
   step 'Header "Rebuild project satellites" should have correct ids and links' do
-    header_should_have_correct_id_and_link(2, 'Check GitLab configuration', 'check-gitlab-configuration', '.documentation')
+    header_should_have_correct_id_and_link(2, '(Re-)Create satellite repositories', 're-create-satellite-repositories', '.documentation')
   end
 end

features/steps/dashboard/merge_requests.rb

@@ -66,7 +66,7 @@ class Spinach::Features::DashboardMergeRequests < Spinach::FeatureSteps
 
   def authored_merge_request
     @authored_merge_request ||= create :merge_request,
-                                  source_branch: 'markdown',
+                                  source_branch: 'simple_merge_request',
                                   author: current_user,
                                   target_project: project,
                                   source_project: project
@@ -74,14 +74,14 @@ class Spinach::Features::DashboardMergeRequests < Spinach::FeatureSteps
 
   def other_merge_request
     @other_merge_request ||= create :merge_request,
-                              source_branch: 'fix',
+                              source_branch: '2_3_notes_fix',
                               target_project: project,
                               source_project: project
   end
 
   def authored_merge_request_from_fork
     @authored_merge_request_from_fork ||= create :merge_request,
-                                            source_branch: 'feature_conflict',
+                                            source_branch: 'basic_page',
                                             author: current_user,
                                             target_project: public_project,
                                             source_project: forked_project
@@ -89,7 +89,7 @@ class Spinach::Features::DashboardMergeRequests < Spinach::FeatureSteps
 
   def assigned_merge_request_from_fork
     @assigned_merge_request_from_fork ||= create :merge_request,
-                                            source_branch: 'markdown',
+                                            source_branch: 'basic_page_fix',
                                             assignee: current_user,
                                             target_project: public_project,
                                             source_project: forked_project

features/steps/project/forked_merge_requests.rb

@@ -9,6 +9,7 @@ class Spinach::Features::ProjectForkedMergeRequests < Spinach::FeatureSteps
     @project = Project.find_by(name: "Shop")
     @project ||= create(:project, name: "Shop")
     @project.team << [@user, :reporter]
+    @project.ensure_satellite_exists
   end
 
   step 'I have a project forked off of "Shop" called "Forked Shop"' do

features/steps/project/merge_requests.rb

@@ -198,10 +198,15 @@ class Spinach::Features::ProjectMergeRequests < Spinach::FeatureSteps
   end
 
   step 'merge request "Bug NS-05" is mergeable' do
+    merge_request.project.satellite.create
     merge_request.mark_as_mergeable
   end
 
   step 'I accept this merge request' do
+    Gitlab::Satellite::MergeAction.any_instance.stub(
+      merge!: true,
+    )
+
     page.within '.mr-state-widget' do
       click_button "Accept Merge Request"
     end

lib/api/merge_requests.rb

@@ -198,11 +198,7 @@ module API
 
           if merge_request.open? && !merge_request.work_in_progress?
             if merge_request.can_be_merged?
-              commit_message = params[:merge_commit_message] || merge_request.merge_commit_message
-
-              ::MergeRequests::MergeService.new(merge_request.target_project, current_user).
-                execute(merge_request, commit_message)
-
+              merge_request.automerge!(current_user, params[:merge_commit_message] || merge_request.merge_commit_message)
               present merge_request, with: Entities::MergeRequest
             else
               render_api_error!('Branch cannot be merged', 405)

lib/gitlab.rb

 require 'gitlab/git'
 
 module Gitlab
+  autoload :Satellite, 'gitlab/satellite/satellite'
 end

lib/gitlab/backend/shell.rb

@@ -217,6 +217,20 @@ module Gitlab
       FileUtils.mv(full_path(old_name), full_path(new_name))
     end
 
+    # Remove GitLab Satellites for provided path (namespace or repo dir)
+    #
+    # Ex.
+    #   rm_satellites("gitlab")
+    #
+    #   rm_satellites("gitlab/gitlab-ci.git")
+    #
+    def rm_satellites(path)
+      raise ArgumentError.new("Path can't be blank") if path.blank?
+
+      satellites_path = File.join(Gitlab.config.satellites.path, path)
+      FileUtils.rm_r(satellites_path, force: true)
+    end
+
     def url_to_repo(path)
       Gitlab.config.gitlab_shell.ssh_path_prefix + "#{path}.git"
     end

lib/gitlab/satellite/action.rb

+module Gitlab
+  module Satellite
+    class Action
+      DEFAULT_OPTIONS = { git_timeout: Gitlab.config.satellites.timeout.seconds }
+
+      attr_accessor :options, :project, :user
+
+      def initialize(user, project, options = {})
+        @options = DEFAULT_OPTIONS.merge(options)
+        @project = project
+        @user = user
+      end
+
+      protected
+
+      # * Sets a 30s timeout for Git
+      # * Locks the satellite repo
+      # * Yields the prepared satellite repo
+      def in_locked_and_timed_satellite
+        Gitlab::ShellEnv.set_env(user)
+
+        Grit::Git.with_timeout(options[:git_timeout]) do
+          project.satellite.lock do
+            return yield project.satellite.repo
+          end
+        end
+      rescue Errno::ENOMEM => ex
+        return handle_exception(ex)
+      rescue Grit::Git::GitTimeout => ex
+        return handle_exception(ex)
+      ensure
+        Gitlab::ShellEnv.reset_env
+      end
+
+      # * Recreates the satellite
+      # * Sets up Git variables for the user
+      #
+      # Note: use this within #in_locked_and_timed_satellite
+      def prepare_satellite!(repo)
+        project.satellite.clear_and_update!
+
+        if user
+          repo.config['user.name'] = user.name
+          repo.config['user.email'] = user.email
+        end
+      end
+
+      def default_options(options = {})
+        { raise: true, timeout: true }.merge(options)
+      end
+
+      def handle_exception(exception)
+        Gitlab::GitLogger.error(exception.message)
+        false
+      end
+    end
+  end
+end

lib/gitlab/satellite/compare_action.rb

+module Gitlab
+  module Satellite
+    class BranchesWithoutParent < StandardError; end
+
+    class CompareAction < Action
+      def initialize(user, target_project, target_branch, source_project, source_branch)
+        super user, target_project
+
+        @target_project, @target_branch = target_project, target_branch
+        @source_project, @source_branch = source_project, source_branch
+      end
+
+      # Compare 2 repositories and return Gitlab::CompareResult object
+      def result
+        in_locked_and_timed_satellite do |target_repo|
+          prepare_satellite!(target_repo)
+          update_satellite_source_and_target!(target_repo)
+
+          Gitlab::CompareResult.new(compare(target_repo))
+        end
+      rescue Grit::Git::CommandFailed => ex
+        raise BranchesWithoutParent
+      end
+
+      private
+
+      # Assumes a satellite exists that is a fresh clone of the projects repo, prepares satellite for diffs
+      def update_satellite_source_and_target!(target_repo)
+        target_repo.remote_add('source', @source_project.repository.path_to_repo)
+        target_repo.remote_fetch('source')
+      rescue Grit::Git::CommandFailed => ex
+        handle_exception(ex)
+      end
+
+      def compare(repo)
+        @compare ||= Gitlab::Git::Compare.new(
+          Gitlab::Git::Repository.new(repo.path),
+          "origin/#{@target_branch}",
+          "source/#{@source_branch}"
+        )
+      end
+    end
+  end
+end

lib/gitlab/satellite/logger.rb

+module Gitlab
+  module Satellite
+    class Logger < Gitlab::Logger
+      def self.file_name
+        'satellites.log'
+      end
+
+      def format_message(severity, timestamp, progname, msg)
+        "#{timestamp.to_s(:long)}: #{msg}\n"
+      end
+    end
+  end
+end

lib/gitlab/satellite/merge_action.rb

+module Gitlab
+  module Satellite
+    # GitLab server-side merge
+    class MergeAction < Action
+      attr_accessor :merge_request
+
+      def initialize(user, merge_request)
+        super user, merge_request.target_project
+        @merge_request = merge_request
+      end
+
+      # Checks if a merge request can be executed without user interaction
+      def can_be_merged?
+        in_locked_and_timed_satellite do |merge_repo|
+          prepare_satellite!(merge_repo)
+          merge_in_satellite!(merge_repo)
+        end
+      end
+
+      # Merges the source branch into the target branch in the satellite and
+      # pushes it back to the repository.
+      # It also removes the source branch if requested in the merge request (and this is permitted by the merge request).
+      #
+      # Returns false if the merge produced conflicts
+      # Returns false if pushing from the satellite to the repository failed or was rejected
+      # Returns true otherwise
+      def merge!(merge_commit_message = nil)
+        in_locked_and_timed_satellite do |merge_repo|
+          prepare_satellite!(merge_repo)
+          if merge_in_satellite!(merge_repo, merge_commit_message)
+            # push merge back to bare repo
+            # will raise CommandFailed when push fails
+            merge_repo.git.push(default_options, :origin, merge_request.target_branch)
+
+            # remove source branch
+            if merge_request.remove_source_branch?
+              # will raise CommandFailed when push fails
+              merge_repo.git.push(default_options, :origin, ":#{merge_request.source_branch}")
+            end
+            # merge, push and branch removal successful
+            true
+          end
+        end
+      rescue Grit::Git::CommandFailed => ex
+        handle_exception(ex)
+      end
+
+      def diff_in_satellite
+        in_locked_and_timed_satellite do |merge_repo|
+          prepare_satellite!(merge_repo)
+          update_satellite_source_and_target!(merge_repo)
+
+          # Only show what is new in the source branch compared to the target branch, not the other way around.
+          # The line below with merge_base is equivalent to diff with three dots (git diff branch1...branch2)
+          # From the git documentation: "git diff A...B" is equivalent to "git diff $(git-merge-base A B) B"
+          common_commit = merge_repo.git.native(:merge_base, default_options, ["origin/#{merge_request.target_branch}", "source/#{merge_request.source_branch}"]).strip
+          merge_repo.git.native(:diff, default_options, common_commit, "source/#{merge_request.source_branch}")
+        end
+      rescue Grit::Git::CommandFailed => ex
+        handle_exception(ex)
+      end
+
+      def diffs_between_satellite
+        in_locked_and_timed_satellite do |merge_repo|
+          prepare_satellite!(merge_repo)
+          update_satellite_source_and_target!(merge_repo)
+          if merge_request.for_fork?
+            repository = Gitlab::Git::Repository.new(merge_repo.path)
+            diffs = Gitlab::Git::Diff.between(
+              repository,
+              "source/#{merge_request.source_branch}",
+              "origin/#{merge_request.target_branch}"
+            )
+          else
+            raise "Attempt to determine diffs between for a non forked merge request in satellite MergeRequest.id:[#{merge_request.id}]"
+          end
+
+          return diffs
+        end
+      rescue Grit::Git::CommandFailed => ex
+        handle_exception(ex)
+      end
+
+      # Get commit as an email patch
+      def format_patch
+        in_locked_and_timed_satellite do |merge_repo|
+          prepare_satellite!(merge_repo)
+          update_satellite_source_and_target!(merge_repo)
+          patch = merge_repo.git.format_patch(default_options({ stdout: true }), "origin/#{merge_request.target_branch}..source/#{merge_request.source_branch}")
+        end
+      rescue Grit::Git::CommandFailed => ex
+        handle_exception(ex)
+      end
+
+      # Retrieve an array of commits between the source and the target
+      def commits_between
+        in_locked_and_timed_satellite do |merge_repo|
+          prepare_satellite!(merge_repo)
+          update_satellite_source_and_target!(merge_repo)
+          if merge_request.for_fork?
+            repository = Gitlab::Git::Repository.new(merge_repo.path)
+            commits = Gitlab::Git::Commit.between(
+              repository,
+              "origin/#{merge_request.target_branch}",
+              "source/#{merge_request.source_branch}"
+            )
+          else
+            raise "Attempt to determine commits between for a non forked merge request in satellite MergeRequest.id:[#{merge_request.id}]"
+          end
+
+          return commits
+        end
+      rescue Grit::Git::CommandFailed => ex
+        handle_exception(ex)
+      end
+
+      private
+      # Merges the source_branch into the target_branch in the satellite.
+      #
+      # Note: it will clear out the satellite before doing anything
+      #
+      # Returns false if the merge produced conflicts
+      # Returns true otherwise
+      def merge_in_satellite!(repo, message = nil)
+        update_satellite_source_and_target!(repo)
+
+        message ||= "Merge branch '#{merge_request.source_branch}' into '#{merge_request.target_branch}'"
+
+        # merge the source branch into the satellite
+        # will raise CommandFailed when merge fails
+        repo.git.merge(default_options({ no_ff: true }), "-m#{message}", "source/#{merge_request.source_branch}")
+      rescue Grit::Git::CommandFailed => ex
+        handle_exception(ex)
+      end
+
+      # Assumes a satellite exists that is a fresh clone of the projects repo, prepares satellite for merges, diffs etc
+      def update_satellite_source_and_target!(repo)
+        repo.remote_add('source', merge_request.source_project.repository.path_to_repo)
+        repo.remote_fetch('source')
+        repo.git.checkout(default_options({ b: true }), merge_request.target_branch, "origin/#{merge_request.target_branch}")
+      rescue Grit::Git::CommandFailed => ex
+        handle_exception(ex)
+      end
+    end
+  end
+end

lib/gitlab/satellite/satellite.rb

+module Gitlab
+  module Satellite
+    autoload :DeleteFileAction, 'gitlab/satellite/files/delete_file_action'
+    autoload :EditFileAction,   'gitlab/satellite/files/edit_file_action'
+    autoload :FileAction,       'gitlab/satellite/files/file_action'
+    autoload :NewFileAction,    'gitlab/satellite/files/new_file_action'
+
+    class CheckoutFailed < StandardError; end
+    class CommitFailed < StandardError; end
+    class PushFailed < StandardError; end
+
+    class Satellite
+      include Gitlab::Popen
+
+      PARKING_BRANCH = "__parking_branch"
+
+      attr_accessor :project
+
+      def initialize(project)
+        @project = project
+      end
+
+      def log(message)
+        Gitlab::Satellite::Logger.error(message)
+      end
+
+      def clear_and_update!
+        project.ensure_satellite_exists
+
+        @repo = nil
+        clear_working_dir!
+        delete_heads!
+        remove_remotes!
+        update_from_source!
+      end
+
+      def create
+        output, status = popen(%W(git clone -- #{project.repository.path_to_repo} #{path}),
+                               Gitlab.config.satellites.path)
+
+        log("PID: #{project.id}: git clone #{project.repository.path_to_repo} #{path}")
+        log("PID: #{project.id}: -> #{output}")
+
+        if status.zero?
+          true
+        else
+          log("Failed to create satellite for #{project.name_with_namespace}")
+          false
+        end
+      end
+
+      def exists?
+        File.exists? path
+      end
+
+      # * Locks the satellite
+      # * Changes the current directory to the satellite's working dir
+      # * Yields
+      def lock
+        project.ensure_satellite_exists
+
+        File.open(lock_file, "w+") do |f|
+          begin
+            f.flock File::LOCK_EX
+            yield
+          ensure
+            f.flock File::LOCK_UN
+          end
+        end
+      end
+
+      def lock_file
+        create_locks_dir unless File.exists?(lock_files_dir)
+        File.join(lock_files_dir, "satellite_#{project.id}.lock")
+      end
+
+      def path
+        File.join(Gitlab.config.satellites.path, project.path_with_namespace)
+      end
+
+      def repo
+        project.ensure_satellite_exists
+
+        @repo ||= Grit::Repo.new(path)
+      end
+
+      def destroy
+        FileUtils.rm_rf(path)
+      end
+
+      private
+
+      # Clear the working directory
+      def clear_working_dir!
+        repo.git.reset(hard: true)
+        repo.git.clean(f: true, d: true, x: true)
+      end
+
+      # Deletes all branches except the parking branch
+      #
+      # This ensures we have no name clashes or issues updating branches when
+      # working with the satellite.
+      def delete_heads!
+        heads = repo.heads.map(&:name)
+
+        # update or create the parking branch
+        repo.git.checkout(default_options({ B: true }), PARKING_BRANCH)
+
+        # remove the parking branch from the list of heads ...
+        heads.delete(PARKING_BRANCH)
+        # ... and delete all others
+        heads.each { |head| repo.git.branch(default_options({ D: true }), head) }
+      end
+
+      # Deletes all remotes except origin
+      #
+      # This ensures we have no remote name clashes or issues updating branches when
+      # working with the satellite.
+      def remove_remotes!
+        remotes = repo.git.remote.split(' ')
+        remotes.delete('origin')
+        remotes.each { |name| repo.git.remote(default_options,'rm', name)}
+      end
+
+      # Updates the satellite from bare repo
+      #
+      # Note: this will only update remote branches (i.e. origin/*)
+      def update_from_source!
+        repo.git.remote(default_options, 'set-url', :origin, project.repository.path_to_repo)
+        repo.git.fetch(default_options, :origin)
+      end
+
+      def default_options(options = {})
+        { raise: true, timeout: true }.merge(options)
+      end
+
+      # Create directory for storing
+      # satellites lock files
+      def create_locks_dir
+        FileUtils.mkdir_p(lock_files_dir)
+      end
+
+      def lock_files_dir
+        @lock_files_dir ||= File.join(Gitlab.config.satellites.path, "tmp")
+      end
+    end
+  end
+end

lib/tasks/gitlab/check.rake

@@ -25,6 +25,7 @@ namespace :gitlab do
       check_init_script_exists
       check_init_script_up_to_date
       check_projects_have_namespace
+      check_satellites_exist
       check_redis_version
       check_ruby_version
       check_git_version
@@ -237,6 +238,37 @@ namespace :gitlab do
       end
     end
 
+    def check_satellites_exist
+      print "Projects have satellites? ... "
+
+      unless Project.count > 0
+        puts "can't check, you have no projects".magenta
+        return
+      end
+      puts ""
+
+      Project.find_each(batch_size: 100) do |project|
+        print sanitized_message(project)
+
+        if project.satellite.exists?
+          puts "yes".green
+        elsif project.empty_repo?
+          puts "can't create, repository is empty".magenta
+        else
+          puts "no".red
+          try_fixing_it(
+            sudo_gitlab("bundle exec rake gitlab:satellites:create RAILS_ENV=production"),
+            "If necessary, remove the tmp/repo_satellites directory ...",
+            "... and rerun the above command"
+          )
+          for_more_information(
+            "doc/raketasks/maintenance.md "
+          )
+          fix_and_rerun
+        end
+      end
+    end
+
     def check_log_writable
       print "Log directory writable? ... "
 
@@ -307,6 +339,7 @@ namespace :gitlab do
       check_repo_base_is_not_symlink
       check_repo_base_user_and_group
       check_repo_base_permissions
+      check_satellites_permissions
       check_repos_hooks_directory_is_link
       check_gitlab_shell_self_test
 
@@ -384,6 +417,29 @@ namespace :gitlab do
       end
     end
 
+    def check_satellites_permissions
+      print "Satellites access is drwxr-x---? ... "
+
+      satellites_path = Gitlab.config.satellites.path
+      unless File.exists?(satellites_path)
+        puts "can't check because of previous errors".magenta
+        return
+      end
+
+      if File.stat(satellites_path).mode.to_s(8).ends_with?("0750")
+        puts "yes".green
+      else
+        puts "no".red
+        try_fixing_it(
+          "sudo chmod u+rwx,g=rx,o-rwx #{satellites_path}",
+        )
+        for_more_information(
+          see_installation_guide_section "GitLab"
+        )
+        fix_and_rerun
+      end
+    end
+
     def check_repo_base_user_and_group
       gitlab_shell_ssh_user = Gitlab.config.gitlab_shell.ssh_user
       gitlab_shell_owner_group = Gitlab.config.gitlab_shell.owner_group

lib/tasks/gitlab/enable_automerge.rake

+namespace :gitlab do
+  namespace :satellites do
+    desc "GitLab | Create satellite repos"
+    task create: :environment do
+      create_satellites
+    end
+  end
+
+  def create_satellites
+    warn_user_is_not_gitlab
+
+    print "Creating satellites for ..."
+    unless Project.count > 0
+      puts "skipping, because you have no projects".magenta
+      return
+    end
+    puts ""
+
+    Project.find_each(batch_size: 100) do |project|
+      print "#{project.name_with_namespace.yellow} ... "
+
+      unless project.repo_exists?
+        puts "skipping, because the repo is empty".magenta
+        next
+      end
+
+      if project.satellite.exists?
+        puts "exists already".green
+      else
+        print "\n... "
+        if project.satellite.create
+          puts "created".green
+        else
+          puts "error".red
+        end
+      end
+    end
+  end
+end

spec/lib/gitlab/reference_extractor_spec.rb

@@ -49,8 +49,8 @@ describe Gitlab::ReferenceExtractor do
   end
 
   it 'accesses valid merge requests' do
-    @m0 = create(:merge_request, source_project: project, target_project: project, source_branch: 'markdown')
-    @m1 = create(:merge_request, source_project: project, target_project: project, source_branch: 'feature_conflict')
+    @m0 = create(:merge_request, source_project: project, target_project: project, source_branch: 'aaa')
+    @m1 = create(:merge_request, source_project: project, target_project: project, source_branch: 'bbb')
 
     subject.analyze("!999, !#{@m1.iid}, and !#{@m0.iid}.")
     expect(subject.merge_requests).to eq([@m1, @m0])

spec/lib/gitlab/satellite/action_spec.rb

+require 'spec_helper'
+
+describe 'Gitlab::Satellite::Action' do
+  let(:project) { create(:project) }
+  let(:user) { create(:user) }
+
+  describe '#prepare_satellite!' do
+    it 'should be able to fetch timeout from conf' do
+      expect(Gitlab::Satellite::Action::DEFAULT_OPTIONS[:git_timeout]).to eq(30.seconds)
+    end
+
+    it 'create a repository with a parking branch and one remote: origin' do
+      repo = project.satellite.repo
+
+      #now lets dirty it up
+
+      starting_remote_count = repo.git.list_remotes.size
+      expect(starting_remote_count).to be >= 1
+      #kind of hookey way to add a second remote
+      origin_uri = repo.git.remote({ v: true }).split(" ")[1]
+
+      repo.git.remote({ raise: true }, 'add', 'another-remote', origin_uri)
+      repo.git.branch({ raise: true }, 'a-new-branch')
+
+      expect(repo.heads.size).to be > (starting_remote_count)
+      expect(repo.git.remote().split(" ").size).to be > (starting_remote_count)
+
+      repo.git.config({}, "user.name", "#{user.name} -- foo")
+      repo.git.config({}, "user.email", "#{user.email} -- foo")
+      expect(repo.config['user.name']).to eq("#{user.name} -- foo")
+      expect(repo.config['user.email']).to eq("#{user.email} -- foo")
+
+
+      #These must happen in the context of the satellite directory...
+      satellite_action = Gitlab::Satellite::Action.new(user, project)
+      project.satellite.lock do
+        #Now clean it up, use send to get around prepare_satellite! being protected
+        satellite_action.send(:prepare_satellite!, repo)
+      end
+
+      #verify it's clean
+      heads = repo.heads.map(&:name)
+      expect(heads.size).to eq(1)
+      expect(heads.include?(Gitlab::Satellite::Satellite::PARKING_BRANCH)).to eq(true)
+      remotes = repo.git.remote().split(' ')
+      expect(remotes.size).to eq(1)
+      expect(remotes.include?('origin')).to eq(true)
+      expect(repo.config['user.name']).to eq(user.name)
+      expect(repo.config['user.email']).to eq(user.email)
+    end
+  end
+
+  describe '#in_locked_and_timed_satellite' do
+
+    it 'should make use of a lockfile' do
+      repo = project.satellite.repo
+      called = false
+
+      #set assumptions
+      FileUtils.rm_f(project.satellite.lock_file)
+
+      expect(File.exists?(project.satellite.lock_file)).to be_falsey
+
+      satellite_action = Gitlab::Satellite::Action.new(user, project)
+      satellite_action.send(:in_locked_and_timed_satellite) do |sat_repo|
+        expect(repo).to eq(sat_repo)
+        expect(File.exists? project.satellite.lock_file).to be_truthy
+        called = true
+      end
+
+      expect(called).to be_truthy
+
+    end
+
+    it 'should be able to use the satellite after locking' do
+      repo = project.satellite.repo
+      called = false
+
+      # Set base assumptions
+      if File.exists? project.satellite.lock_file
+        expect(FileLockStatusChecker.new(project.satellite.lock_file).flocked?).to be_falsey
+      end
+
+      satellite_action = Gitlab::Satellite::Action.new(user, project)
+      satellite_action.send(:in_locked_and_timed_satellite) do |sat_repo|
+        called = true
+        expect(repo).to eq(sat_repo)
+        expect(File.exists? project.satellite.lock_file).to be_truthy
+        expect(FileLockStatusChecker.new(project.satellite.lock_file).flocked?).to be_truthy
+      end
+
+      expect(called).to be_truthy
+      expect(FileLockStatusChecker.new(project.satellite.lock_file).flocked?).to be_falsey
+
+    end
+
+    class FileLockStatusChecker < File
+      def flocked?(&block)
+        status = flock LOCK_EX|LOCK_NB
+        case status
+        when false
+          return true
+        when 0
+          begin
+            block ? block.call : false
+          ensure
+            flock LOCK_UN
+          end
+        else
+          raise SystemCallError, status
+        end
+      end
+    end
+
+  end
+end

spec/lib/gitlab/satellite/merge_action_spec.rb

+require 'spec_helper'
+
+describe 'Gitlab::Satellite::MergeAction' do
+  include RepoHelpers
+
+  let(:project) { create(:project, namespace: create(:group)) }
+  let(:fork_project) { create(:project, namespace: create(:group), forked_from_project: project) }
+  let(:merge_request) { create(:merge_request, source_project: project, target_project: project) }
+  let(:merge_request_fork) { create(:merge_request, source_project: fork_project, target_project: project) }
+
+  let(:merge_request_with_conflict) { create(:merge_request, :conflict, source_project: project, target_project: project) }
+  let(:merge_request_fork_with_conflict) { create(:merge_request, :conflict, source_project: project, target_project: project) }
+
+  describe '#commits_between' do
+    def verify_commits(commits, first_commit_sha, last_commit_sha)
+      commits.each { |commit| expect(commit.class).to eq(Gitlab::Git::Commit) }
+      expect(commits.first.id).to eq(first_commit_sha)
+      expect(commits.last.id).to eq(last_commit_sha)
+    end
+
+    context 'on fork' do
+      it 'should get proper commits between' do
+        commits = Gitlab::Satellite::MergeAction.new(merge_request_fork.author, merge_request_fork).commits_between
+        verify_commits(commits, sample_compare.commits.first, sample_compare.commits.last)
+      end
+    end
+
+    context 'between branches' do
+      it 'should raise exception -- not expected to be used by non forks' do
+        expect { Gitlab::Satellite::MergeAction.new(merge_request.author, merge_request).commits_between }.to raise_error(RuntimeError)
+      end
+    end
+  end
+
+  describe '#format_patch' do
+    def verify_content(patch)
+      sample_compare.commits.each do |commit|
+        expect(patch.include?(commit)).to be_truthy
+      end
+    end
+
+    context 'on fork' do
+      it 'should build a format patch' do
+        patch = Gitlab::Satellite::MergeAction.new(merge_request_fork.author, merge_request_fork).format_patch
+        verify_content(patch)
+      end
+    end
+
+    context 'between branches' do
+      it 'should build a format patch' do
+        patch = Gitlab::Satellite::MergeAction.new(merge_request_fork.author, merge_request).format_patch
+        verify_content(patch)
+      end
+    end
+  end
+
+  describe '#diffs_between_satellite tested against diff_in_satellite' do
+    def is_a_matching_diff(diff, diffs)
+      diff_count = diff.scan('diff --git').size
+      expect(diff_count).to be >= 1
+      expect(diffs.size).to eq(diff_count)
+      diffs.each do |a_diff|
+        expect(a_diff.class).to eq(Gitlab::Git::Diff)
+        expect(diff.include? a_diff.diff).to be_truthy
+      end
+    end
+
+    context 'on fork' do
+      it 'should get proper diffs' do
+        diffs = Gitlab::Satellite::MergeAction.new(merge_request_fork.author, merge_request_fork).diffs_between_satellite
+        diff = Gitlab::Satellite::MergeAction.new(merge_request.author, merge_request_fork).diff_in_satellite
+        is_a_matching_diff(diff, diffs)
+      end
+    end
+
+    context 'between branches' do
+      it 'should get proper diffs' do
+        expect{ Gitlab::Satellite::MergeAction.new(merge_request.author, merge_request).diffs_between_satellite }.to raise_error(RuntimeError)
+      end
+    end
+  end
+
+  describe '#can_be_merged?' do
+    context 'on fork' do
+      it do
+        expect(Gitlab::Satellite::MergeAction.new(merge_request_fork.author, merge_request_fork).can_be_merged?).to be_truthy
+      end
+
+      it do
+        expect(Gitlab::Satellite::MergeAction.new(merge_request_fork_with_conflict.author, merge_request_fork_with_conflict).can_be_merged?).to be_falsey
+      end
+    end
+
+    context 'between branches' do
+      it do
+        expect(Gitlab::Satellite::MergeAction.new(merge_request.author, merge_request).can_be_merged?).to be_truthy
+      end
+
+      it do
+        expect(Gitlab::Satellite::MergeAction.new(merge_request_with_conflict.author, merge_request_with_conflict).can_be_merged?).to be_falsey
+      end
+    end
+  end
+end

spec/models/merge_request_spec.rb

@@ -165,7 +165,7 @@ describe MergeRequest do
   end
 
   it_behaves_like 'an editable mentionable' do
-    subject { create(:merge_request) }
+    subject { create(:merge_request, source_project: project) }
 
     let(:backref_text) { "merge request #{subject.to_reference}" }
     let(:set_mentionable_text) { ->(txt){ subject.description = txt } }

spec/models/project_services/slack_service_spec.rb

@@ -67,7 +67,7 @@ describe SlackService do
       opts = {
         title: 'Awesome merge_request',
         description: 'please fix',
-        source_branch: 'feature',
+        source_branch: 'stable',
         target_branch: 'master'
       }
       merge_service = MergeRequests::CreateService.new(project,

spec/models/project_spec.rb

@@ -91,6 +91,7 @@ describe Project do
   describe 'Respond to' do
     it { is_expected.to respond_to(:url_to_repo) }
     it { is_expected.to respond_to(:repo_exists?) }
+    it { is_expected.to respond_to(:satellite) }
     it { is_expected.to respond_to(:update_merge_requests) }
     it { is_expected.to respond_to(:execute_hooks) }
     it { is_expected.to respond_to(:name_with_namespace) }

spec/models/repository_spec.rb

@@ -36,13 +36,13 @@ describe Repository do
 
   describe :can_be_merged? do
     context 'mergeable branches' do
-      subject { repository.can_be_merged?('0b4bc9a49b562e85de7cc9e834518ea6828729b9', 'master') }
+      subject { repository.can_be_merged?('feature', 'master') }
 
       it { is_expected.to be_truthy }
     end
 
     context 'non-mergeable branches' do
-      subject { repository.can_be_merged?('bb5206fee213d983da88c47f9cf4cc6caf9c66dc', 'feature') }
+      subject { repository.can_be_merged?('feature_conflict', 'feature') }
 
       it { is_expected.to be_falsey }
     end

spec/requests/api/files_spec.rb

@@ -110,7 +110,7 @@ describe API::API, api: true  do
       expect(response.status).to eq(400)
     end
 
-    it "should return a 400 if fails to create file" do
+    it "should return a 400 if satellite fails to create file" do
       allow_any_instance_of(Repository).to receive(:remove_file).and_return(false)
 
       delete api("/projects/#{project.id}/repository/files", user), valid_params

spec/requests/api/merge_requests_spec.rb

@@ -148,7 +148,7 @@ describe API::API, api: true  do
       it "should return merge_request" do
         post api("/projects/#{project.id}/merge_requests", user),
              title: 'Test merge_request',
-             source_branch: 'feature_conflict',
+             source_branch: 'stable',
              target_branch: 'master',
              author: user,
              labels: 'label, label2'
@@ -171,20 +171,20 @@ describe API::API, api: true  do
 
       it "should return 400 when target_branch is missing" do
         post api("/projects/#{project.id}/merge_requests", user),
-        title: "Test merge_request", source_branch: "markdown", author: user
+        title: "Test merge_request", source_branch: "stable", author: user
         expect(response.status).to eq(400)
       end
 
       it "should return 400 when title is missing" do
         post api("/projects/#{project.id}/merge_requests", user),
-        target_branch: 'master', source_branch: 'markdown'
+        target_branch: 'master', source_branch: 'stable'
         expect(response.status).to eq(400)
       end
 
       it 'should return 400 on invalid label names' do
         post api("/projects/#{project.id}/merge_requests", user),
              title: 'Test merge_request',
-             source_branch: 'markdown',
+             source_branch: 'stable',
              target_branch: 'master',
              author: user,
              labels: 'label, ?'
@@ -198,7 +198,7 @@ describe API::API, api: true  do
         before do
           post api("/projects/#{project.id}/merge_requests", user),
                title: 'Test merge_request',
-               source_branch: 'feature_conflict',
+               source_branch: 'stable',
                target_branch: 'master',
                author: user
           @mr = MergeRequest.all.last
@@ -208,7 +208,7 @@ describe API::API, api: true  do
           expect do
             post api("/projects/#{project.id}/merge_requests", user),
                  title: 'New test merge_request',
-                 source_branch: 'feature_conflict',
+                 source_branch: 'stable',
                  target_branch: 'master',
                  author: user
           end.to change { MergeRequest.count }.by(0)
@@ -228,8 +228,7 @@ describe API::API, api: true  do
 
       it "should return merge_request" do
         post api("/projects/#{fork_project.id}/merge_requests", user2),
-          title: 'Test merge_request', source_branch: "feature_conflict", target_branch: "master",
-          author: user2, target_project_id: project.id, description: 'Test description for Test merge_request'
+        title: 'Test merge_request', source_branch: "stable", target_branch: "master", author: user2, target_project_id: project.id, description: 'Test description for Test merge_request'
         expect(response.status).to eq(201)
         expect(json_response['title']).to eq('Test merge_request')
         expect(json_response['description']).to eq('Test description for Test merge_request')
@@ -259,7 +258,7 @@ describe API::API, api: true  do
 
       it "should return 400 when title is missing" do
         post api("/projects/#{fork_project.id}/merge_requests", user2),
-        target_branch: 'master', source_branch: 'markdown', author: user2, target_project_id: project.id
+        target_branch: 'master', source_branch: 'stable', author: user2, target_project_id: project.id
         expect(response.status).to eq(400)
       end
 
@@ -268,7 +267,7 @@ describe API::API, api: true  do
           post api("/projects/#{project.id}/merge_requests", user),
                title: 'Test merge_request',
                target_branch: 'master',
-               source_branch: 'markdown',
+               source_branch: 'stable',
                author: user,
                target_project_id: fork_project.id
           expect(response.status).to eq(422)
@@ -278,7 +277,7 @@ describe API::API, api: true  do
           post api("/projects/#{fork_project.id}/merge_requests", user2),
                title: 'Test merge_request',
                target_branch: 'master',
-               source_branch: 'markdown',
+               source_branch: 'stable',
                author: user2,
                target_project_id: unrelated_project.id
           expect(response.status).to eq(422)
@@ -287,7 +286,7 @@ describe API::API, api: true  do
 
       it "should return 201 when target_branch is specified and for the same project" do
         post api("/projects/#{fork_project.id}/merge_requests", user2),
-        title: 'Test merge_request', target_branch: 'master', source_branch: 'markdown', author: user2, target_project_id: fork_project.id
+        title: 'Test merge_request', target_branch: 'master', source_branch: 'stable', author: user2, target_project_id: fork_project.id
         expect(response.status).to eq(201)
       end
     end
@@ -303,6 +302,9 @@ describe API::API, api: true  do
 
   describe "PUT /projects/:id/merge_request/:merge_request_id/merge" do
     it "should return merge_request in case of success" do
+      allow_any_instance_of(MergeRequest).
+        to receive_messages(can_be_merged?: true, automerge!: true)
+
       put api("/projects/#{project.id}/merge_request/#{merge_request.id}/merge", user)
 
       expect(response.status).to eq(200)

spec/routing/project_routing_spec.rb

@@ -210,8 +210,8 @@ end
 
 #               diffs_namespace_project_merge_request GET      /:namespace_id/:project_id/merge_requests/:id/diffs(.:format)               projects/merge_requests#diffs
 #             commits_namespace_project_merge_request GET      /:namespace_id/:project_id/merge_requests/:id/commits(.:format)             projects/merge_requests#commits
-#           merge_namespace_project_merge_request POST     /:namespace_id/:project_id/merge_requests/:id/merge(.:format)           projects/merge_requests#merge
-#     merge_check_namespace_project_merge_request GET      /:namespace_id/:project_id/merge_requests/:id/merge_check(.:format)     projects/merge_requests#merge_check
+#           automerge_namespace_project_merge_request POST     /:namespace_id/:project_id/merge_requests/:id/automerge(.:format)           projects/merge_requests#automerge
+#     automerge_check_namespace_project_merge_request GET      /:namespace_id/:project_id/merge_requests/:id/automerge_check(.:format)     projects/merge_requests#automerge_check
 #           ci_status_namespace_project_merge_request GET      /:namespace_id/:project_id/merge_requests/:id/ci_status(.:format)           projects/merge_requests#ci_status
 # toggle_subscription_namespace_project_merge_request POST     /:namespace_id/:project_id/merge_requests/:id/toggle_subscription(.:format) projects/merge_requests#toggle_subscription
 #        branch_from_namespace_project_merge_requests GET      /:namespace_id/:project_id/merge_requests/branch_from(.:format)             projects/merge_requests#branch_from
@@ -233,15 +233,15 @@ describe Projects::MergeRequestsController, 'routing' do
     expect(get('/gitlab/gitlabhq/merge_requests/1/commits')).to route_to('projects/merge_requests#commits', namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1')
   end
 
-  it 'to #merge' do
-    expect(post('/gitlab/gitlabhq/merge_requests/1/merge')).to route_to(
-      'projects/merge_requests#merge',
+  it 'to #automerge' do
+    expect(post('/gitlab/gitlabhq/merge_requests/1/automerge')).to route_to(
+      'projects/merge_requests#automerge',
       namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1'
     )
   end
 
-  it 'to #merge_check' do
-    expect(get('/gitlab/gitlabhq/merge_requests/1/merge_check')).to route_to('projects/merge_requests#merge_check', namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1')
+  it 'to #automerge_check' do
+    expect(get('/gitlab/gitlabhq/merge_requests/1/automerge_check')).to route_to('projects/merge_requests#automerge_check', namespace_id: 'gitlab', project_id: 'gitlabhq', id: '1')
   end
 
   it 'to #branch_from' do

spec/services/merge_requests/create_service_spec.rb

@@ -10,7 +10,7 @@ describe MergeRequests::CreateService do
         {
           title: 'Awesome merge_request',
           description: 'please fix',
-          source_branch: 'feature',
+          source_branch: 'stable',
           target_branch: 'master'
         }
       end

spec/services/merge_requests/merge_service_spec.rb

@@ -24,6 +24,11 @@ describe MergeRequests::MergeService do
       it { expect(merge_request).to be_valid }
       it { expect(merge_request).to be_merged }
 
+      it 'should execute hooks with merge action' do
+        expect(service).to have_received(:execute_hooks).
+                               with(merge_request, 'merge')
+      end
+
       it 'should send email to user2 about merge of new merge_request' do
         email = ActionMailer::Base.deliveries.last
         expect(email.to.first).to eq(user2.email)

spec/support/mentionable_shared_examples.rb

@@ -9,7 +9,7 @@ def common_mentionable_setup
   let(:author)  { subject.author }
 
   let(:mentioned_issue)  { create(:issue, project: project) }
-  let!(:mentioned_mr)     { create(:merge_request, :simple, source_project: project) }
+  let(:mentioned_mr)     { create(:merge_request, :simple, source_project: project) }
   let(:mentioned_commit) { project.commit }
 
   let(:ext_proj)   { create(:project, :public) }