Add option to keep repo on project delete

Update the project API controller to use `Projects::DestroyService`
instead of calling `Project#destroy` directly.

Also add an optional parameter, `:keep_repo`, that allows a project to
be deleted without deleting the repository, wiki, and satellite from
disk.

app/controllers/projects_controller.rb

@@ -100,7 +100,8 @@ class ProjectsController < ApplicationController
   def destroy
     return access_denied! unless can?(current_user, :remove_project, project)
 
-    ::Projects::DestroyService.new(@project, current_user, {}).execute
+    ::Projects::DestroyService.new(@project, current_user,
+                                   keep_repo: params[:keep_repo]).execute
 
     respond_to do |format|
       format.html do

app/services/projects/destroy_service.rb

@@ -6,7 +6,10 @@ module Projects
       project.team.truncate
       project.repository.expire_cache unless project.empty_repo?
 
-      if project.destroy
+      result = project.destroy
+      return false unless result
+
+      unless params[:keep_repo]
         GitlabShellWorker.perform_async(
           :remove_repository,
           project.path_with_namespace
@@ -18,11 +21,11 @@ module Projects
         )
 
         project.satellite.destroy
+      end
 
       log_info("Project \"#{project.name}\" was removed")
       system_hook_service.execute_hooks_for(project, :destroy)
-        true
-      end
+      result
     end
   end
 end

lib/api/projects.rb

@@ -174,11 +174,17 @@ module API
       #
       # Parameters:
       #   id (required) - The ID of a project
+      #   keep_repo (optional) - If true, then delete the project from the
+      #     database but keep the repo, wiki, and satellite on disk.
       # Example Request:
       #   DELETE /projects/:id
       delete ":id" do
         authorize! :remove_project, user_project
-        user_project.destroy
+        ::Projects::DestroyService.new(
+          user_project,
+          current_user,
+          keep_repo: params[:keep_repo]
+        ).execute
       end
 
       # Mark this project as forked from another

spec/features/projects_spec.rb

@@ -10,7 +10,12 @@ describe "Projects", feature: true  do
       visit edit_project_path(@project)
     end
 
-    it "should be correct path" do
+    it 'should delete the project from the database and disk' do
+      expect(GitlabShellWorker).to(
+        receive(:perform_async).with(:remove_repository,
+                                     /#{@project.path_with_namespace}/)
+      ).twice
+
       expect { click_link "Remove project" }.to change {Project.count}.by(-1)
     end
   end

spec/requests/api/projects_spec.rb

@@ -632,10 +632,25 @@ describe API::API, api: true  do
   describe "DELETE /projects/:id" do
     context "when authenticated as user" do
       it "should remove project" do
+        expect(GitlabShellWorker).to(
+          receive(:perform_async).with(:remove_repository,
+                                       /#{project.path_with_namespace}/)
+        ).twice
+
         delete api("/projects/#{project.id}", user)
         response.status.should == 200
       end
 
+      it 'should keep repo when "keep_repo" param is true' do
+        expect(GitlabShellWorker).not_to(
+          receive(:perform_async).with(:remove_repository,
+                                       /#{project.path_with_namespace}/)
+        )
+
+        delete api("/projects/#{project.id}?keep_repo=true", user)
+        response.status.should == 200
+      end
+
       it "should not remove a project if not an owner" do
         user3 = create(:user)
         project.team << [user3, :developer]