Do not allow jobs to be erased

app/controllers/projects/jobs_controller.rb

@@ -5,6 +5,7 @@ class Projects::JobsController < Projects::ApplicationController
     only: [:index, :show, :status, :raw, :trace]
   before_action :authorize_update_build!,
     except: [:index, :show, :status, :raw, :trace, :cancel_all]
+  before_action :authorize_erase_build!, only: [:erase]
 
   layout 'project'
 
@@ -131,6 +132,10 @@ class Projects::JobsController < Projects::ApplicationController
     return access_denied! unless can?(current_user, :update_build, build)
   end
 
+  def authorize_erase_build!
+    return access_denied! unless can?(current_user, :erase_build, build)
+  end
+
   def build
     @build ||= project.builds.find(params[:id])
       .present(current_user: current_user)

app/models/ci/build.rb

@@ -192,6 +192,10 @@ module Ci
       project.build_timeout
     end
 
+    def owned_by?(current_user)
+      user == current_user
+    end
+
     # A slugified version of the build ref, suitable for inclusion in URLs and
     # domain names. Rules:
     #

app/policies/ci/build_policy.rb

@@ -10,6 +10,11 @@ module Ci
       end
     end
 
+    condition(:owner_of_build) do
+      can?(:developer_access) && @subject.owned_by?(@user)
+    end
+
     rule { protected_ref }.prevent :update_build
+    rule { can?(:master_access) | owner_of_build }.enable :erase_build
   end
 end

app/serializers/build_details_entity.rb

@@ -6,7 +6,7 @@ class BuildDetailsEntity < JobEntity
   expose :pipeline, using: PipelineEntity
 
   expose :erased_by, if: -> (*) { build.erased? }, using: UserEntity
-  expose :erase_path, if: -> (*) { build.erasable? && can?(current_user, :update_build, project) } do |build|
+  expose :erase_path, if: -> (*) { build.erasable? && can?(current_user, :erase_build, build) } do |build|
     erase_project_job_path(project, build)
   end
 

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

@@ -71,7 +71,7 @@
                     class: 'js-raw-link-controller has-tooltip controllers-buttons' do
               = icon('file-text-o')
 
-          - if can?(current_user, :update_build, @project) && @build.erasable?
+          - if @build.erasable? && can?(current_user, :erase_build, @build)
             = link_to erase_project_job_path(@project, @build),
                       method: :post,
                       data: { confirm: 'Are you sure you want to erase this build?', placement: 'top', container: 'body' },

lib/api/jobs.rb

@@ -136,7 +136,7 @@ module API
         authorize_update_builds!
 
         build = find_build!(params[:job_id])
-        authorize!(:update_build, build)
+        authorize!(:erase_build, build)
         return forbidden!('Job is not erasable!') unless build.erasable?
 
         build.erase(erased_by: current_user)

lib/api/v3/builds.rb

@@ -169,7 +169,7 @@ module API
           authorize_update_builds!
 
           build = get_build!(params[:build_id])
-          authorize!(:update_build, build)
+          authorize!(:erase_build, build)
           return forbidden!('Build is not erasable!') unless build.erasable?
 
           build.erase(erased_by: current_user)

spec/policies/ci/build_policy_spec.rb

@@ -150,5 +150,47 @@ describe Ci::BuildPolicy do
         end
       end
     end
+
+    # TODO: Finish spec
+    describe 'rules for erase build' do
+      let(:project) { create(:project, :repository) }
+      let(:another_user) { create(:user) }
+
+      context 'when developer created a build' do
+        before do
+          project.add_developer(user)
+        end
+
+        context 'when the build was created by the user' do
+          let(:build) { create(:ci_build, user: user) }
+
+          it { expect(policy).to be_allowed :erase_build }
+        end
+
+        context 'when the build was created by others' do
+          let(:build) { create(:ci_build, user: another_user) }
+
+          it { expect(policy).to be_disallowed :erase_build }
+        end
+      end
+
+      context 'when master erases a build' do
+        before do
+          project.add_master(user)
+        end
+
+        context 'when the build was created by the user' do
+          let(:build) { create(:ci_build, user: user) }
+
+          it { expect(policy).to be_allowed :erase_build }
+        end
+
+        context 'when the build was created by others' do
+          let(:build) { create(:ci_build, user: another_user) }
+
+          it { expect(policy).to be_allowed :erase_build }
+        end
+      end
+    end
   end
 end