Unschedule group deletion on deleting user group membership removal

When a group member is removed from a group,
delete associated deletion schedule, if present.

doc/user/group/index.md

@@ -530,7 +530,10 @@ To remove a group and its contents:
 This action either:
 
 - Removes the group, and also queues a background job to delete all projects in that group.
-- Since [GitLab 12.8](https://gitlab.com/gitlab-org/gitlab/-/issues/33257), on [Premium or Silver](https://about.gitlab.com/pricing/premium/) or higher tiers, marks a group for deletion. The deletion will happen 7 days later by default, but this can be changed in the [instance settings](../admin_area/settings/visibility_and_access_controls.md#default-deletion-delay).
+- Since [GitLab 12.8](https://gitlab.com/gitlab-org/gitlab/-/issues/33257), on [Premium or Silver](https://about.gitlab.com/pricing/premium/) or higher tiers, this action adds a background job to mark a group for deletion. By default, the job schedules the deletion 7 days in the future. You can modify this waiting period through the [instance settings](../admin_area/settings/visibility_and_access_controls.md#default-deletion-delay).
+
+Since [GitLab 13.6](https://gitlab.com/gitlab-org/gitlab/-/issues/39504), if the user who sets up the deletion leaves or is otherwise removed from the group before the
+actual deletion happens, the job is cancelled, and the group is no longer scheduled for deletion.
 
 ### Restore a group **(PREMIUM)**
 

ee/app/services/ee/members/destroy_service.rb

@@ -13,6 +13,7 @@ module EE
         end
 
         cleanup_group_identity(member)
+        cleanup_group_deletion_schedule(member) if member.source&.is_a?(Group)
       end
 
       private
@@ -40,6 +41,14 @@ module EE
 
         saml_provider.identities.for_user(member.user).delete_all
       end
+
+      def cleanup_group_deletion_schedule(member)
+        deletion_schedule = member.source&.deletion_schedule
+
+        return unless deletion_schedule
+
+        deletion_schedule.destroy if deletion_schedule.deleting_user == member.user
+      end
     end
   end
 end

ee/changelogs/unreleased/39504-group-deletion-job-fix.yml

+---
+title: Unschedule group deletion on deleting member removal
+merge_request: 45715
+author:
+type: changed

ee/spec/services/ee/members/destroy_service_spec.rb

@@ -57,6 +57,30 @@ RSpec.describe Members::DestroyService do
         expect(details[:reason]).to be_nil
       end
     end
+
+    context 'group deletion schedule' do
+      context 'when member user has a scheduled deletion for the group' do
+        let!(:group_deletion_schedule) { create(:group_deletion_schedule, group: group, user_id: member_user.id, marked_for_deletion_on: 2.days.ago) }
+
+        it 'deletes the group deletion schedule' do
+          expect(group.reload.deletion_schedule).to eq(group_deletion_schedule)
+
+          subject.execute(member)
+
+          expect(group.reload.deletion_schedule).to be nil
+        end
+      end
+
+      context 'when scheduled deletion for the group belongs to different user' do
+        let!(:group_deletion_schedule) { create(:group_deletion_schedule, group: group, user_id: current_user.id, marked_for_deletion_on: 2.days.ago) }
+
+        it 'does not delete the group deletion schedule' do
+          subject.execute(member)
+
+          expect(group.reload.deletion_schedule).to eq(group_deletion_schedule)
+        end
+      end
+    end
   end
 
   context 'when current user is not present' do # ie, when the system initiates the destroy