Add button to revert commit on Commit detail page.

app/controllers/projects/commit_controller.rb

@@ -2,6 +2,8 @@
 #
 # Not to be confused with CommitsController, plural.
 class Projects::CommitController < Projects::ApplicationController
+  include CreatesCommit
+
   # Authorize
   before_action :require_non_empty_project
   before_action :authorize_download_code!, except: [:cancel_builds, :retry_builds]
@@ -9,6 +11,7 @@ class Projects::CommitController < Projects::ApplicationController
   before_action :authorize_read_commit_status!, only: [:builds]
   before_action :commit
   before_action :define_show_vars, only: [:show, :builds]
+  before_action :authorize_edit_tree!, only: [:revert]
 
   def show
     apply_diff_view_cookie!
@@ -55,6 +58,10 @@ class Projects::CommitController < Projects::ApplicationController
     render layout: false
   end
 
+  def revert
+
+  end
+
   private
 
   def commit

app/helpers/commits_helper.rb

@@ -123,6 +123,13 @@ module CommitsHelper
     )
   end
 
+  def can_collaborate_with_project?(project = nil)
+    project ||= @project
+
+    can?(current_user, :push_code, project) ||
+      (current_user && current_user.already_forked?(project))
+  end
+
   protected
 
   # Private: Returns a link to a person. If the person has a matching user and

app/views/projects/commit/_commit_box.html.haml

@@ -16,8 +16,17 @@
     = link_to namespace_project_tree_path(@project.namespace, @project, @commit), class: "btn btn-grouped" do
       = icon('files-o')
       Browse Files
-    = link_to '#modal-revert-commit', { 'data-target' => '#modal-revert-commit', 'data-toggle' => 'modal', class: 'btn btn-grouped'} do
-      Revert
+    - if can_collaborate_with_project?
+      = link_to '#modal-revert-commit', { 'data-target' => '#modal-revert-commit', 'data-toggle' => 'modal', class: 'btn btn-grouped'} do
+        Revert
+    - else
+      - continue_params = { to:         namespace_project_commit_path(@project.namespace, @project, @commit.id),
+                            notice:     edit_in_new_fork_notice,
+                            notice_now: edit_in_new_fork_notice_now }
+      - fork_path = namespace_project_forks_path(@project.namespace, @project, namespace_key:  current_user.namespace.id,
+                                                                              continue:       continue_params)
+      = link_to fork_path, { class: 'btn btn-grouped', method: :post } do
+        Revert
   %div
 
 %p

app/views/projects/commit/show.html.haml

@@ -12,3 +12,5 @@
 = render "projects/diffs/diffs", diffs: @diffs, project: @project,
          diff_refs: @diff_refs
 = render "projects/notes/notes_with_form"
+- if can_collaborate_with_project?
+  = render "projects/commit/revert"