workaround Ruby 3.3.3 net-pop bug

Rakefile

@@ -1,5 +1,8 @@
 # frozen_string_literal: true
 
+require "rails"
+Rails.env = "test"
+
 require "bundler/gem_tasks"
 
 # Run `rake release` to release a new version of the gem.

lib/dockerfile-rails/scanner.rb

@@ -14,6 +14,12 @@ def scan_rails_app
         @git ||= ENV["RAILS_ENV"] != "test" && parser.specs.any? do |spec|
           spec.source.instance_of? Bundler::Source::Git
         end
+
+        # determine if the application is affected by the net-pop bug
+        # https://github.com/ruby/ruby/pull/11006#issuecomment-2176562332
+        if RUBY_VERSION == "3.3.3" && @gemfile.include?("net-pop")
+          @netpopbug = parser.specs.find { |spec| spec.name == "net-pop" }.dependencies.empty?
+        end
       end
 
       if File.exist? "Gemfile"
@@ -86,5 +92,11 @@ def scan_rails_app
     def using_trilogy?
       @gemfile.include?("trilogy") || @gemfile.include?("activerecord-trilogy-adapter")
     end
+
+    ### patches ###
+    if RUBY_VERSION == "3.3.3"
+      Bundler::LockfileParser.new(Bundler.read_file("Gemfile.lock"))
+
+    end
   end
 end

lib/generators/dockerfile_generator.rb

@@ -402,6 +402,15 @@ def generate_app
         STDERR.puts "\n" + shell.set_color(message, Thor::Shell::Color::RED, Thor::Shell::Color::BOLD)
       end
 
+      if @netpopbug && !dockerfile.include?("net-pop")
+        message = "Ruby 3.3.3 net-pop bug detected."
+        STDERR.puts "\n" + shell.set_color(message, Thor::Shell::Color::RED, Thor::Shell::Color::BOLD)
+        STDERR.puts "Please see https://github.com/ruby/ruby/pull/11006"
+        STDERR.puts "Change your Ruby version, or run `bin/rails generate dockerfile`,"
+        STDERR.puts "or add the following to your Dockerfile:"
+        STDERR.puts 'RUN sed -i "/net-pop (0.1.2)/a\      net-protocol" Gemfile.lock'
+      end
+
       if (options.sqlite3? || @sqlite3) && !dockerfile.include?("DATABASE_URL") && File.exist?("fly.toml")
         toml = IO.read("fly.toml")
         if !toml.include?("[[env]]")

lib/generators/templates/Dockerfile.erb

@@ -87,6 +87,9 @@ ENV <%= build_env.join(" \\\n    ") %>
 <% end -%>
 # Install application gems
 COPY<% if options.link? %> --link<% end %> Gemfile Gemfile.lock <% if references_ruby_version_file? %>.ruby-version <% end %>./
+<% if @netpopbug && Rails.env != "test" -%>
+RUN sed -i "/net-pop (0.1.2)/a\      net-protocol" Gemfile.lock
+<% end -%>
 <% if options.cache? -%>
 RUN --mount=type=cache,id=bld-gem-cache,sharing=locked,target=/srv/vendor \
 <% if private_gemserver_env_variable_name -%>