Allow projects to be started from a template

Started implementation for the first iteration of
gitlab-org/gitlab-ce#32420. This will allow users to select a template
to start with, instead of an empty repository in the project just
created.

Internally this is basically a small extension of the ImportExport
GitLab projects we already support. We just import a certain import
tar archive. This commits includes the first one: Ruby on Rails. In the
future more will be added.

app/controllers/import/gitlab_projects_controller.rb

@@ -12,15 +12,7 @@ class Import::GitlabProjectsController < Import::BaseController
       return redirect_back_or_default(options: { alert: "You need to upload a GitLab project export archive." })
     end
-    import_upload_path = Gitlab::ImportExport.import_upload_path(filename: project_params[:file].original_filename)
-
-    FileUtils.mkdir_p(File.dirname(import_upload_path))
-    FileUtils.copy_entry(project_params[:file].path, import_upload_path)
-
-    @project = Gitlab::ImportExport::ProjectCreator.new(project_params[:namespace_id],
-                                                        current_user,
-                                                        import_upload_path,
-                                                        project_params[:path]).execute
+    @project = ::Projects::GitlabProjectsImporterService.new(current_user, project_params).execute
     if @project.saved?
       redirect_to(

app/controllers/projects_controller.rb

@@ -27,7 +27,12 @@ class ProjectsController < Projects::ApplicationController
   end
   def create
-    @project = ::Projects::CreateService.new(current_user, project_params).execute
+    @project =
+      if project_from_template?
+        ::Projects::CreateFromTemplateService.new(current_user, project_params).execute
+      else
+        ::Projects::CreateService.new(current_user, project_params).execute
+      end
     if @project.saved?
       cookies[:issue_board_welcome_hidden] = { path: project_path(@project), value: nil, expires: Time.at(0) }
@@ -324,6 +329,7 @@ class ProjectsController < Projects::ApplicationController
       :runners_token,
       :tag_list,
       :visibility_level,
+      :template_title,
       project_feature_attributes: %i[
         builds_access_level
@@ -345,6 +351,10 @@ class ProjectsController < Projects::ApplicationController
     false
   end
+  def project_from_template?
+    project_params[:template_title]&.present?
+  end
+
   def project_view_files?
     if current_user
       current_user.project_view == 'files'

app/models/project.rb

@@ -71,6 +71,7 @@ class Project < ActiveRecord::Base
   attr_accessor :new_default_branch
   attr_accessor :old_path_with_namespace
+  attr_accessor :template_title
   attr_writer :pipeline_status
   alias_attribute :title, :name

app/services/projects/create_from_template_service.rb

+module Projects
+  class CreateFromTemplateService < BaseService
+    def initialize(user, params)
+      @current_user, @params = user, params.dup
+    end
+
+    def execute
+      params[:file] = Gitlab::ProjectTemplate.find(params[:template_title]).file
+
+      @params[:from_template] = true
+      GitlabProjectsImporterService.new(@current_user, @params).execute
+    end
+  end
+end

app/services/projects/gitlab_projects_importer_service.rb

+# This service is an adapter used to for the GitLab Import feature, and
+# creating a project from a template.
+# The latter will under the hood just import an archive supplied by GitLab.
+module Projects
+  class GitlabProjectsImporterService
+    attr_reader :current_user, :params
+
+    def initialize(user, params)
+      @current_user, @params = user, params.dup
+    end
+
+    def execute
+      FileUtils.mkdir_p(File.dirname(import_upload_path))
+      FileUtils.copy_entry(file.path, import_upload_path)
+
+      Gitlab::ImportExport::ProjectCreator.new(params[:namespace_id],
+                                               current_user,
+                                               import_upload_path,
+                                               params[:path]).execute
+    end
+
+    private
+
+    def import_upload_path
+      @import_upload_path ||= Gitlab::ImportExport
+        .import_upload_path(filename: "#{params[:namespace_id]}-#{params[:path]}")
+    end
+
+    def file
+      params[:file]
+    end
+  end
+end

app/views/projects/_project_templates.html.haml

+.col-sm-12.template-buttons
+  - Gitlab::ProjectTemplate.all.each do |template|
+    -# The title should be the value posted to the controller, a pretty name to print would be
+    -# template.name
+    = template.title
+    = image_tag(template.logo_path)
+
+  = f.text_field :template_title, placeholder: "rails", class: "form-control", tabindex: 2, autofocus: true, required: true

app/views/projects/new.html.haml

@@ -17,36 +17,17 @@
           Create or Import your project from popular Git services
     .col-lg-9
       = form_for @project, html: { class: 'new_project' } do |f|
-        .row
-          .form-group.col-xs-12.col-sm-6
-            = f.label :namespace_id, class: 'label-light' do
-              %span
-                Project path
-            .form-group
-              .input-group
-                - if current_user.can_select_namespace?
-                  .input-group-addon
-                    = root_url
-                  = f.select :namespace_id, namespaces_options(namespace_id_from(params) || :current_user, display_path: true, extra_group: namespace_id_from(params)), {}, { class: 'select2 js-select-namespace', tabindex: 1}
-
-                - else
-                  .input-group-addon.static-namespace
-                    #{root_url}#{current_user.username}/
-                  = f.hidden_field :namespace_id, value: current_user.namespace_id
-          .form-group.col-xs-12.col-sm-6.project-path
-            = f.label :path, class: 'label-light' do
-              %span
-                Project name
-            = f.text_field :path, placeholder: "my-awesome-project", class: "form-control", tabindex: 2, autofocus: true, required: true
-        - if current_user.can_create_group?
-          .help-block
-            Want to house several dependent projects under the same namespace?
-            = link_to "Create a group", new_group_path
+        .project-template.js-toggle-container
+          .form_group.clearfix
+            = f.label :template_project, class: 'label-light' do
+              Start from template
+            .col-sm-12.import-buttons
+              = render 'project_templates', f: f
         - if import_sources_enabled?
           .project-import.js-toggle-container
             .form-group.clearfix
-              = f.label :visibility_level, class: 'label-light' do
+              = f.label :visibility_level, class: 'label-light' do #the label here seems wrong
                 Import project from
               .col-sm-12.import-buttons
                 %div
@@ -90,6 +71,32 @@
             .js-toggle-content.hide
               = render "shared/import_form", f: f
+        .row
+          .form-group.col-xs-12.col-sm-6
+            = f.label :namespace_id, class: 'label-light' do
+              %span
+                Project path
+            .form-group
+              .input-group
+                - if current_user.can_select_namespace?
+                  .input-group-addon
+                    = root_url
+                  = f.select :namespace_id, namespaces_options(namespace_id_from(params) || :current_user, display_path: true, extra_group: namespace_id_from(params)), {}, { class: 'select2 js-select-namespace', tabindex: 1}
+
+                - else
+                  .input-group-addon.static-namespace
+                    #{root_url}#{current_user.username}/
+                  = f.hidden_field :namespace_id, value: current_user.namespace_id
+          .form-group.col-xs-12.col-sm-6.project-path
+            = f.label :path, class: 'label-light' do
+              %span
+                Project name
+            = f.text_field :path, placeholder: "my-awesome-project", class: "form-control", tabindex: 2, autofocus: true, required: true
+        - if current_user.can_create_group?
+          .help-block
+            Want to house several dependent projects under the same namespace?
+            = link_to "Create a group", new_group_path
+
         .form-group
           = f.label :description, class: 'label-light' do
             Project description

lib/gitlab/import_export.rb

@@ -15,7 +15,9 @@ module Gitlab
     end
     def import_upload_path(filename:)
-      File.join(storage_path, 'uploads', filename)
+      milliseconds = Process.clock_gettime(Process::CLOCK_REALTIME, :millisecond)
+
+      File.join(storage_path, 'uploads', "#{millisecond}-#{filename}")
     end
     def project_filename

lib/gitlab/project_template.rb

+module Gitlab
+  class ProjectTemplate
+    attr_reader :title, :name
+
+    def initialize(name, title)
+      @name, @title = name, title
+    end
+
+    def logo_path
+      "project_templates/#{name}.png"
+    end
+
+    def file
+      template_archive.open
+    end
+
+    def template_archive
+      Rails.root.join("vendor/project_templates/#{name}.tar.gz")
+    end
+
+    def ==(other)
+      name == other.name && title == other.title
+    end
+
+    TemplatesTable = [
+      ProjectTemplate.new('rails', 'Ruby on Rails')
+    ].freeze
+
+    class << self
+      def all
+        TemplatesTable
+      end
+
+      def find(name)
+        all.find { |template| template.name == name.to_s }
+      end
+    end
+  end
+end

spec/features/projects_spec.rb

 require 'spec_helper'
 feature 'Project', feature: true do
+  describe 'creating from template' do
+    let(:user)    { create(:user) }
+    let(:template) { Gitlab::ProjectTemplate.find(:rails) }
+
+    before do
+      sign_in user
+      visit new_project_path
+    end
+
+    it "allows creation from the #{template.name} template" do
+      fill_in("project_template_title", with: template.title)
+      fill_in("project_path", with: template.name)
+
+      page.within '#content-body' do
+        click_button "Create project"
+      end
+
+      expect(page).to have_content 'Import'
+    end
+  end
+
   describe 'description' do
     let(:project) { create(:project, :repository) }
     let(:path)    { project_path(project) }

spec/lib/gitlab/project_template_spec.rb

+require 'spec_helper'
+
+describe Gitlab::ProjectTemplate do
+  describe '.all' do
+    it 'returns a all templates' do
+      expected = [
+        described_class.new('rails', 'Ruby on Rails')
+      ]
+
+      expect(described_class.all).to be_an(Array)
+      expect(described_class.all).to eq(expected)
+    end
+  end
+
+  describe '.find' do
+    subject { described_class.find(query) }
+
+    context 'when there is a match' do
+      let(:query) { :rails }
+
+      it { is_expected.to be_a(described_class) }
+    end
+
+    context 'when there is no match' do
+      let(:query) { 'no-match' }
+
+      it { is_expected.to be(nil) }
+    end
+  end
+
+  describe 'instance methods' do
+    subject { described_class.new('phoenix', 'Phoenix Framework') }
+
+    it { is_expected.to respond_to(:logo_path, :file, :template_archive) }
+  end
+
+  describe 'validate all templates' do
+    described_class.all.each do |template|
+      it "#{template.name} has a valid archive" do
+        archive = template.template_archive
+        logo = Rails.root.join("app/assets/images/#{template.logo_path}")
+
+        expect(File.exist?(archive)).to be(true)
+        expect(File.exist?(logo)).to be(true)
+      end
+    end
+  end
+end

spec/services/projects/create_from_template_service_spec.rb

+require 'spec_helper'
+
+describe Projects::CreateFromTemplateService do
+  let(:user) { create(:user) }
+  let(:project_params) do
+    {
+      path: user.to_param,
+      template_title: 'rails'
+    }
+  end
+
+  subject { described_class.new(user, project_params) }
+
+  it 'calls the importer service' do
+    expect_any_instance_of(Projects::GitlabProjectsImporterService).to receive(:execute)
+
+    subject.execute
+  end
+
+  it 'returns the project thats created' do
+    project = subject.execute
+
+    expect(project).to be_saved
+    expect(project.import_status).to eq('scheduled')
+  end
+end