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.

2 files changed, 42 insertions, 1 deletions

diff --git a/lib/gitlab/import_export.rb b/lib/gitlab/import_export.rb
index 3470a09eaf0..9f23d29218b 100644
--- a/lib/gitlab/import_export.rb
+++ b/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
diff --git a/lib/gitlab/project_template.rb b/lib/gitlab/project_template.rb
new file mode 100644
index 00000000000..72fcda154c5
--- /dev/null
+++ b/lib/gitlab/project_template.rb
@@ -0,0 +1,39 @@
+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