Adds email templates for when mirror was hard failed

app/mailers/emails/projects.rb

@@ -39,12 +39,12 @@ module Emails
            subject:   @message.subject)
     end
 
-    def mirror_hard_failed(project_id, user_id)
-      @current_user = @user = User.find user_id
-      @project = Project.find project_id
+    def mirror_was_hard_failed_email(project_id, user_id)
+      @user = User.find(user_id)
+      @project = Project.find(project_id)
 
       mail(to: @user.notification_email,
-           subject: subject('Mirror hard failed'))
+           subject: subject('Pull mirroring paused'))
     end
   end
 end

app/views/notify/mirror_was_hard_failed_email.html.haml

+%p
+  Mirroring from #{@project.import_url} to #{@project.full_path} failed with the following error:
+
+%p
+  = @project.import_error.try(:strip)
+
+Repository mirroring has been paused due to too many failed attempts, and can be resumed by a project admin.

app/views/notify/mirror_was_hard_failed_email.text.erb

+Mirroring from <%= @project.import_url %> to <%= @project.full_path %> failed with the following error:
+
+<%= @project.import_error.try(:strip) %>
+
+Repository mirroring has been paused due to too many failed attempts, and can be resumed by a project admin.
+
+

ee/app/models/ee/project/import_status_state_machine.rb

@@ -20,11 +20,12 @@ module EE
             end
           end
 
+          after_transition started: :failed do |project, _|
+            ::NotificationService.new.mirror_was_hard_failed(project) if project.mirror?
+          end
+
           after_transition [:scheduled, :started] => [:finished, :failed] do |project, _|
-            if project.mirror?
-              ::Gitlab::Mirror.decrement_capacity(project.id)
-              ::NotificationService.new.mirror_was_hard_failed(project)
-            end
+            ::Gitlab::Mirror.decrement_capacity(project.id) if project.mirror?
           end
 
           before_transition started: :failed do |project, _|

ee/app/services/ee/notification_service.rb

@@ -20,13 +20,15 @@ module EE
       return if note.author == support_bot
       return unless issue.subscribed?(support_bot, issue.project)
 
-      Notify.service_desk_new_note_email(issue.id, note.id).deliver_later
+      mailer.service_desk_new_note_email(issue.id, note.id).deliver_later
     end
 
     def mirror_was_hard_failed(project)
+      return unless project.mirror_hard_failed?
+
       recepient = project.mirror_user
 
-      mailer.mirror_hard_failed(project.id, recepient.id).deliver_later
+      mailer.mirror_was_hard_failed_email(project.id, recepient.id).deliver_later
     end
   end
 end

ee/changelogs/unreleased/1123-mirroring-notifies-when-hard-failed.yml

+---
+title: Repository mirroring notifies when hard failed
+merge_request: 4699
+author:
+type: added

ee/spec/services/ee/notification_service_spec.rb

@@ -119,4 +119,24 @@ describe EE::NotificationService, :mailer do
       end
     end
   end
+
+  describe 'mirror hard failed' do
+    let(:user) { create(:user) }
+
+    it 'does not send email when mirror is not hard failed' do
+      project = create(:project, :mirror)
+
+      expect(Notify).not_to receive(:mirror_was_hard_failed_email)
+
+      subject.mirror_was_hard_failed(project)
+    end
+
+    it 'sends email to mirror user when mirror hard failed' do
+      project = create(:project, :mirror, :import_hard_failed, mirror_user: user)
+
+      expect(Notify).to receive(:mirror_was_hard_failed_email).with(project.id, user.id).and_call_original
+
+      subject.mirror_was_hard_failed(project)
+    end
+  end
 end

spec/mailers/notify_spec.rb

@@ -1419,6 +1419,22 @@ describe Notify do
     end
   end
 
+  describe 'mirror was hard failed' do
+    let(:project) { create(:project, :mirror, :import_hard_failed) }
+
+    subject { described_class.mirror_was_hard_failed_email(project.id, user.id) }
+
+    it_behaves_like 'an email sent from GitLab'
+    it_behaves_like 'it should not have Gmail Actions links'
+    it_behaves_like "a user cannot unsubscribe through footer link"
+
+    it 'has the correct subject and body' do
+      is_expected.to have_subject("#{project.name} | Pull mirroring paused")
+      is_expected.to have_html_escaped_body_text(project.import_url)
+      is_expected.to have_html_escaped_body_text(project.full_path)
+    end
+  end
+
   describe 'admin notification' do
     let(:example_site_path) { root_path }
     let(:user) { create(:user) }