Remove unnecessary bundler installation from Dockerfile #153

yahonda · 2025-12-08T08:03:25Z

This pull request addresses rails/rails#56325

Bundler has been included as a default gem since Ruby 2.6.

Rails 7.0, which is our oldest version in Rails CI, requires Ruby 2.7 or higher. This means all Ruby versions we test against already have Bundler pre-installed.

When gem install bundler is run on our Rails Nightly CI, it creates a duplicate installation of bundler:

As default gem: /usr/local/lib/ruby/4.0.0+0/bundler/
gem install bundler: /usr/local/lib/ruby/gems/4.0.0+0/gems/bundler-4.0.0/

This duplication causes constant redefinition warnings such as:

warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION

gem update --system takes care of upgrading not only gem command but also bundler command so we can use the latest available bundler command after removing the gem install bundler.

$ ruby -v
ruby 3.2.9 (2025-07-24 revision 8f611e0c46) [x86_64-linux]
$ gem -v
3.4.19
$ bundler -v
Bundler version 2.4.19
$ gem update --system
Updating rubygems-update
Fetching rubygems-update-4.0.0.gem
Successfully installed rubygems-update-4.0.0
Parsing documentation for rubygems-update-4.0.0
Installing ri documentation for rubygems-update-4.0.0
Done installing documentation for rubygems-update after 0 seconds
Parsing documentation for rubygems-update-4.0.0
Done installing documentation for rubygems-update after 0 seconds
Installing RubyGems 4.0.0
  Successfully built RubyGem
  Name: bundler
  Version: 4.0.0
  File: bundler-4.0.0.gem
Bundler 4.0.0 installed
RubyGems 4.0.0 installed
Regenerating binstubs
Regenerating plugins
Parsing documentation for rubygems-4.0.0
Installing ri documentation for rubygems-4.0.0

... snip ...

RubyGems system software updated
$ ruby -v
ruby 3.2.9 (2025-07-24 revision 8f611e0c46) [x86_64-linux]
$ gem -v
4.0.0
$ bundler -v
4.0.0
$

References:

Ruby 2.6.0 Released: https://www.ruby-lang.org/en/news/2018/12/25/ruby-2-6-0-released/ "Bundler is now installed as a default gem."
Rails 7.0 requires Ruby 2.7+: https://github.com/rails/rails/blob/7-0-stable/rails.gemspec#L12
Rails CI against 6-1-stable branch https://buildkite.com/rails/rails/builds?branch=6-1-stable no longer runs since Oct 27 2025: https://buildkite.com/rails/rails/builds/123203/steps/canvas

Bundler has been included as a default gem since Ruby 2.6. Rails 7.0, which is our oldest version in Rails CI, requires Ruby 2.7 or higher. This means all Ruby versions we test against already have Bundler pre-installed. When `gem install bundler` is run on our Rails Nightly CI, it creates a duplicate installation of bundler: - As default gem: /usr/local/lib/ruby/4.0.0+0/bundler/ - `gem install bundler`: /usr/local/lib/ruby/gems/4.0.0+0/gems/bundler-4.0.0/ This duplication causes constant redefinition warnings such as: ``` warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION ``` `gem update --system` takes care of upgrading not only `gem` command but also `bundler` command so we can use the latest available bundler command after removing the `gem install bundler`. ``` $ ruby -v ruby 3.2.9 (2025-07-24 revision 8f611e0c46) [x86_64-linux] $ gem -v 3.4.19 $ bundler -v Bundler version 2.4.19 $ gem update --system Updating rubygems-update Fetching rubygems-update-4.0.0.gem Successfully installed rubygems-update-4.0.0 Parsing documentation for rubygems-update-4.0.0 Installing ri documentation for rubygems-update-4.0.0 Done installing documentation for rubygems-update after 0 seconds Parsing documentation for rubygems-update-4.0.0 Done installing documentation for rubygems-update after 0 seconds Installing RubyGems 4.0.0 Successfully built RubyGem Name: bundler Version: 4.0.0 File: bundler-4.0.0.gem Bundler 4.0.0 installed RubyGems 4.0.0 installed Regenerating binstubs Regenerating plugins Parsing documentation for rubygems-4.0.0 Installing ri documentation for rubygems-4.0.0 ... snip ... RubyGems system software updated $ ruby -v ruby 3.2.9 (2025-07-24 revision 8f611e0c46) [x86_64-linux] $ gem -v 4.0.0 $ bundler -v 4.0.0 $ ``` References: - Ruby 2.6.0 Released: https://www.ruby-lang.org/en/news/2018/12/25/ruby-2-6-0-released/ "Bundler is now installed as a default gem." - Rails 7.0 requires Ruby 2.7+: https://github.com/rails/rails/blob/7-0-stable/rails.gemspec#L12 - Rails CI against 6-1-stable branch https://buildkite.com/rails/rails/builds?branch=6-1-stable no longer runs since Oct 27 2025: https://buildkite.com/rails/rails/builds/123203/steps/canvas Fixes rails/rails#56325

yahonda · 2025-12-08T09:11:46Z

Somehow, the same warning appears when testing with Ruby 3.4

https://buildkite.com/rails/rails-ci/builds/335#019afd2c-1e12-4a18-93d4-9abe3de45e82/1565-1578

yahonda · 2025-12-09T00:43:20Z

Reproduced these failures with Ruby 3.4 locally.

Use RubyGems 3.6.9 and Bundler 2.6.9

$ ruby -v
ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux]
$ gem -v
3.6.9
$ bundler -v
Bundler version 2.6.9
$ rm ../Gemfile.lock ; bundle install ; bundle exec ruby -w -Itest -Ilib -I../activesupport/lib -I../actionpack/lib -I../actionview/lib -I../activemodel/lib test/generators/scaffold_generator_test.rb --seed 46859
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Bundle complete! 82 Gemfile dependencies, 235 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
1 installed gem you directly depend on is looking for funding.
  Run `bundle fund` for details
Run options: --seed 46859

# Running:

............................

Finished in 31.094991s, 0.9005 runs/s, 16.4335 assertions/s.
28 runs, 511 assertions, 0 failures, 0 errors, 0 skips

RUN gem update --system to bump RubyGems and Bundler to 4.0.0, Not installing gem install bundler

$ gem update --system
Fetching rubygems-update-4.0.0.gem
Successfully installed rubygems-update-4.0.0
Parsing documentation for rubygems-update-4.0.0
Installing ri documentation for rubygems-update-4.0.0
Done installing documentation for rubygems-update after 0 seconds
Parsing documentation for rubygems-update-4.0.0
Done installing documentation for rubygems-update after 0 seconds
Installing RubyGems 4.0.0
  Successfully built RubyGem
  Name: bundler
  Version: 4.0.0
  File: bundler-4.0.0.gem
Bundler 4.0.0 installed
RubyGems 4.0.0 installed
Regenerating binstubs
Regenerating plugins
Parsing documentation for rubygems-4.0.0
Installing ri documentation for rubygems-4.0.0

... snip ...
RubyGems system software updated
$ ruby -v

Use RubyGems and Bundler 4.0.0, these tests fail

$ ruby -v
ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux]
$ gem -v
4.0.0
$ bundler -v
4.0.0
$ cd railties
$ rm ../Gemfile.lock ; bundle install ; bundle exec ruby -w -Itest -Ilib -I../activesupport/lib -I../actionpack/lib -I../actionview/lib -I../activemodel/lib test/generators/scaffold_generator_test.rb --seed 46859
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Bundle complete! 82 Gemfile dependencies, 235 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
1 installed gem you directly depend on is looking for funding.
  Run `bundle fund` for details
Run options: --seed 46859

# Running:

......F

Failure:
ScaffoldGeneratorTest#test_scaffold_tests_pass_by_default_inside_api_mountable_engine [test/generators/scaffold_generator_test.rb:622]:
Expected /6 runs, 10 assertions, 0 failures, 0 errors/ to match "/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/rubygems_ext.rb:177: warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_ext.rb:177: warning: previous definition of VALIDATES_FOR_RESOLUTION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: already initialized constant Bundler::FileUtils::VERSION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: previous definition of VERSION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: already initialized constant Bundler::FileUtils::Entry_::S_IF_DOOR\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: previous definition of S_IF_DOOR was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: already initialized constant Bundler::FileUtils::Entry_::DIRECTORY_TERM\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: previous definition of DIRECTORY_TERM was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: already initialized constant Bundler::FileUtils::OPT_TABLE\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: previous definition of OPT_TABLE was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: already initialized constant Bundler::FileUtils::LOW_METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: previous definition of LOW_METHODS was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: already initialized constant Bundler::FileUtils::METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: previous definition of METHODS was here\nbin/rails aborted!\nArgumentError: Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (ArgumentError)\n/home/yahonda/src/github.com/rails/rails/railties/test/fixtures/tmp/bukkits/Rakefile:6:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:48:in 'block in Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:46:in 'Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:73:in 'Rails::Command::TestCommand#run_prepare_task'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:32:in 'Rails::Command::TestCommand#perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:176:in 'Rails::Command::Base#invoke_command'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:71:in 'Rails::Command::Base.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:65:in 'block in Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:143:in 'Rails::Command.with_argv'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:63:in 'Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands.rb:18:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/engine/commands.rb:9:in '<top (required)>'\nbin/rails:14:in '<main>'\n(See full trace by running task with --trace)\n".


bin/test test/generators/scaffold_generator_test.rb:614

.F

Failure:
ScaffoldGeneratorTest#test_scaffold_tests_pass_by_default_inside_full_engine [test/generators/scaffold_generator_test.rb:610]:
Expected /8 runs, 12 assertions, 0 failures, 0 errors/ to match "/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/rubygems_ext.rb:177: warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_ext.rb:177: warning: previous definition of VALIDATES_FOR_RESOLUTION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: already initialized constant Bundler::FileUtils::VERSION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: previous definition of VERSION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: already initialized constant Bundler::FileUtils::Entry_::S_IF_DOOR\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: previous definition of S_IF_DOOR was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: already initialized constant Bundler::FileUtils::Entry_::DIRECTORY_TERM\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: previous definition of DIRECTORY_TERM was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: already initialized constant Bundler::FileUtils::OPT_TABLE\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: previous definition of OPT_TABLE was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: already initialized constant Bundler::FileUtils::LOW_METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: previous definition of LOW_METHODS was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: already initialized constant Bundler::FileUtils::METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: previous definition of METHODS was here\nbin/rails aborted!\nArgumentError: Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (ArgumentError)\n/home/yahonda/src/github.com/rails/rails/railties/test/fixtures/tmp/bukkits/Rakefile:6:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:48:in 'block in Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:46:in 'Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:73:in 'Rails::Command::TestCommand#run_prepare_task'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:32:in 'Rails::Command::TestCommand#perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:176:in 'Rails::Command::Base#invoke_command'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:71:in 'Rails::Command::Base.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:65:in 'block in Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:143:in 'Rails::Command.with_argv'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:63:in 'Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands.rb:18:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/engine/commands.rb:9:in '<top (required)>'\nbin/rails:14:in '<main>'\n(See full trace by running task with --trace)\n".


bin/test test/generators/scaffold_generator_test.rb:602

.F

Failure:
ScaffoldGeneratorTest#test_scaffold_tests_pass_by_default_inside_namespaced_mountable_engine [test/generators/scaffold_generator_test.rb:598]:
Expected /8 runs, 12 assertions, 0 failures, 0 errors/ to match "/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/rubygems_ext.rb:177: warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_ext.rb:177: warning: previous definition of VALIDATES_FOR_RESOLUTION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: already initialized constant Bundler::FileUtils::VERSION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: previous definition of VERSION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: already initialized constant Bundler::FileUtils::Entry_::S_IF_DOOR\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: previous definition of S_IF_DOOR was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: already initialized constant Bundler::FileUtils::Entry_::DIRECTORY_TERM\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: previous definition of DIRECTORY_TERM was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: already initialized constant Bundler::FileUtils::OPT_TABLE\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: previous definition of OPT_TABLE was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: already initialized constant Bundler::FileUtils::LOW_METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: previous definition of LOW_METHODS was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: already initialized constant Bundler::FileUtils::METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: previous definition of METHODS was here\nbin/rails aborted!\nArgumentError: Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (ArgumentError)\n/home/yahonda/src/github.com/rails/rails/railties/test/fixtures/tmp/bukkits-admin/Rakefile:6:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:48:in 'block in Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:46:in 'Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:73:in 'Rails::Command::TestCommand#run_prepare_task'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:32:in 'Rails::Command::TestCommand#perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:176:in 'Rails::Command::Base#invoke_command'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:71:in 'Rails::Command::Base.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:65:in 'block in Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:143:in 'Rails::Command.with_argv'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:63:in 'Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands.rb:18:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/engine/commands.rb:9:in '<top (required)>'\nbin/rails:14:in '<main>'\n(See full trace by running task with --trace)\n".


bin/test test/generators/scaffold_generator_test.rb:584

.....F

Failure:
ScaffoldGeneratorTest#test_scaffold_tests_pass_by_default_inside_api_full_engine [test/generators/scaffold_generator_test.rb:634]:
Expected /6 runs, 10 assertions, 0 failures, 0 errors/ to match "/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/rubygems_ext.rb:177: warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_ext.rb:177: warning: previous definition of VALIDATES_FOR_RESOLUTION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: already initialized constant Bundler::FileUtils::VERSION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: previous definition of VERSION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: already initialized constant Bundler::FileUtils::Entry_::S_IF_DOOR\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: previous definition of S_IF_DOOR was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: already initialized constant Bundler::FileUtils::Entry_::DIRECTORY_TERM\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: previous definition of DIRECTORY_TERM was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: already initialized constant Bundler::FileUtils::OPT_TABLE\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: previous definition of OPT_TABLE was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: already initialized constant Bundler::FileUtils::LOW_METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: previous definition of LOW_METHODS was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: already initialized constant Bundler::FileUtils::METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: previous definition of METHODS was here\nbin/rails aborted!\nArgumentError: Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (ArgumentError)\n/home/yahonda/src/github.com/rails/rails/railties/test/fixtures/tmp/bukkits/Rakefile:6:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:48:in 'block in Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:46:in 'Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:73:in 'Rails::Command::TestCommand#run_prepare_task'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:32:in 'Rails::Command::TestCommand#perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:176:in 'Rails::Command::Base#invoke_command'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:71:in 'Rails::Command::Base.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:65:in 'block in Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:143:in 'Rails::Command.with_argv'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:63:in 'Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands.rb:18:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/engine/commands.rb:9:in '<top (required)>'\nbin/rails:14:in '<main>'\n(See full trace by running task with --trace)\n".


bin/test test/generators/scaffold_generator_test.rb:626

....F

Failure:
ScaffoldGeneratorTest#test_scaffold_tests_pass_by_default_inside_mountable_engine [test/generators/scaffold_generator_test.rb:580]:
Expected /8 runs, 12 assertions, 0 failures, 0 errors/ to match "/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/rubygems_ext.rb:177: warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_ext.rb:177: warning: previous definition of VALIDATES_FOR_RESOLUTION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: already initialized constant Bundler::FileUtils::VERSION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: previous definition of VERSION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: already initialized constant Bundler::FileUtils::Entry_::S_IF_DOOR\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: previous definition of S_IF_DOOR was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: already initialized constant Bundler::FileUtils::Entry_::DIRECTORY_TERM\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: previous definition of DIRECTORY_TERM was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: already initialized constant Bundler::FileUtils::OPT_TABLE\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: previous definition of OPT_TABLE was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: already initialized constant Bundler::FileUtils::LOW_METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: previous definition of LOW_METHODS was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: already initialized constant Bundler::FileUtils::METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: previous definition of METHODS was here\nbin/rails aborted!\nArgumentError: Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (ArgumentError)\n/home/yahonda/src/github.com/rails/rails/railties/test/fixtures/tmp/bukkits/Rakefile:6:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:48:in 'block in Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:46:in 'Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:73:in 'Rails::Command::TestCommand#run_prepare_task'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:32:in 'Rails::Command::TestCommand#perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:176:in 'Rails::Command::Base#invoke_command'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:71:in 'Rails::Command::Base.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:65:in 'block in Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:143:in 'Rails::Command.with_argv'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:63:in 'Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands.rb:18:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/engine/commands.rb:9:in '<top (required)>'\nbin/rails:14:in '<main>'\n(See full trace by running task with --trace)\n".


bin/test test/generators/scaffold_generator_test.rb:572

......

Finished in 24.497815s, 1.1430 runs/s, 20.8590 assertions/s.
28 runs, 511 assertions, 5 failures, 0 errors, 0 skips
$

Installing Bundler 4 sepaterely by running gem install bundler, these tests pass

$ ruby -v
ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux]
$ gem -v
4.0.0
$ bundler -v
4.0.0
$ gem install bundler
Successfully installed bundler-4.0.0
Parsing documentation for bundler-4.0.0
Installing ri documentation for bundler-4.0.0
Done installing documentation for bundler after 0 seconds
1 gem installed
$ ruby -v
ruby 3.4.7 (2025-10-08 revision 7a5688e2a2) +PRISM [x86_64-linux]
$ gem -v
4.0.0
$ bundler -v
4.0.0
$ rm ../Gemfile.lock ; bundle install ; bundle exec ruby -w -Itest -Ilib -I../activesupport/lib -I../actionpack/lib -I../actionview/lib -I../activemodel/lib test/generators/scaffold_generator_test.rb --seed 46859
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Bundle complete! 82 Gemfile dependencies, 235 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
1 installed gem you directly depend on is looking for funding.
  Run `bundle fund` for details
Run options: --seed 46859

# Running:

............................

Finished in 31.506383s, 0.8887 runs/s, 16.2189 assertions/s.
28 runs, 511 assertions, 0 failures, 0 errors, 0 skips
$

yahonda · 2025-12-09T01:12:18Z

This one is minimum.

$ bundle exec ruby -w -Itest test/generators/scaffold_generator_test.rb -n test_scaffold_tests_pass_by_default_inside_mountable_engine
Run options: -n test_scaffold_tests_pass_by_default_inside_mountable_engine --seed 41468

# Running:

F

Failure:
ScaffoldGeneratorTest#test_scaffold_tests_pass_by_default_inside_mountable_engine [test/generators/scaffold_generator_test.rb:580]:
Expected /8 runs, 12 assertions, 0 failures, 0 errors/ to match "/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/rubygems_ext.rb:177: warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_ext.rb:177: warning: previous definition of VALIDATES_FOR_RESOLUTION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: already initialized constant Bundler::FileUtils::VERSION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: previous definition of VERSION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: already initialized constant Bundler::FileUtils::Entry_::S_IF_DOOR\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: previous definition of S_IF_DOOR was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: already initialized constant Bundler::FileUtils::Entry_::DIRECTORY_TERM\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: previous definition of DIRECTORY_TERM was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: already initialized constant Bundler::FileUtils::OPT_TABLE\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: previous definition of OPT_TABLE was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: already initialized constant Bundler::FileUtils::LOW_METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: previous definition of LOW_METHODS was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: already initialized constant Bundler::FileUtils::METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: previous definition of METHODS was here\nbin/rails aborted!\nArgumentError: Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (ArgumentError)\n/home/yahonda/src/github.com/rails/rails/railties/test/fixtures/tmp/bukkits/Rakefile:6:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:48:in 'block in Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:46:in 'Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:73:in 'Rails::Command::TestCommand#run_prepare_task'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:32:in 'Rails::Command::TestCommand#perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:176:in 'Rails::Command::Base#invoke_command'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:71:in 'Rails::Command::Base.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:65:in 'block in Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:143:in 'Rails::Command.with_argv'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:63:in 'Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands.rb:18:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/engine/commands.rb:9:in '<top (required)>'\nbin/rails:14:in '<main>'\n(See full trace by running task with --trace)\n".


bin/test test/generators/scaffold_generator_test.rb:572



Finished in 3.414412s, 0.2929 runs/s, 0.5858 assertions/s.
1 runs, 2 assertions, 1 failures, 0 errors, 0 skips
$

yahonda · 2025-12-09T01:16:38Z

Removing the quietly block to show entire stack trace.

$ git diff test/generators/scaffold_generator_test.rb 
diff --git a/railties/test/generators/scaffold_generator_test.rb b/railties/test/generators/scaffold_generator_test.rb
index 73643c7e26..82e5863ca4 100644
--- a/railties/test/generators/scaffold_generator_test.rb
+++ b/railties/test/generators/scaffold_generator_test.rb
@@ -573,10 +573,8 @@ def test_scaffold_tests_pass_by_default_inside_mountable_engine
     engine_path = File.join(destination_root, "bukkits")
 
     with_new_plugin(engine_path, "--mountable") do
-      quietly do
         `bin/rails g scaffold User name:string age:integer;
         bin/rails db:migrate`
-      end
       assert_match(/8 runs, 12 assertions, 0 failures, 0 errors/, `bin/rails test 2>&1`)
     end
   end

$ bundle exec ruby -w -Itest test/generators/scaffold_generator_test.rb -n test_scaffold_tests_pass_by_default_inside_mountable_engine
Run options: -n test_scaffold_tests_pass_by_default_inside_mountable_engine --seed 48360

# Running:

/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/rubygems_ext.rb:177: warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_ext.rb:177: warning: previous definition of VALIDATES_FOR_RESOLUTION was here
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: already initialized constant Bundler::FileUtils::VERSION
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: previous definition of VERSION was here
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: already initialized constant Bundler::FileUtils::Entry_::S_IF_DOOR
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: previous definition of S_IF_DOOR was here
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: already initialized constant Bundler::FileUtils::Entry_::DIRECTORY_TERM
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: previous definition of DIRECTORY_TERM was here
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: already initialized constant Bundler::FileUtils::OPT_TABLE
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: previous definition of OPT_TABLE was here
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: already initialized constant Bundler::FileUtils::LOW_METHODS
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: previous definition of LOW_METHODS was here
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: already initialized constant Bundler::FileUtils::METHODS
/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: previous definition of METHODS was here
bin/rails aborted!
ArgumentError: Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (ArgumentError)
/home/yahonda/src/github.com/rails/rails/railties/test/fixtures/tmp/bukkits/Rakefile:6:in '<top (required)>'
/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:48:in 'block in Rails::Command::RakeCommand.with_rake'
/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:46:in 'Rails::Command::RakeCommand.with_rake'
/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'
/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:150:in 'Rails::Command.invoke_rake'
/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:67:in 'block in Rails::Command.invoke'
/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:143:in 'Rails::Command.with_argv'
/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:63:in 'Rails::Command.invoke'
/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands.rb:18:in '<top (required)>'
/home/yahonda/src/github.com/rails/rails/railties/lib/rails/engine/commands.rb:9:in '<top (required)>'
bin/rails:14:in '<main>'
(See full trace by running task with --trace)
F

Failure:
ScaffoldGeneratorTest#test_scaffold_tests_pass_by_default_inside_mountable_engine [test/generators/scaffold_generator_test.rb:578]:
Expected /8 runs, 12 assertions, 0 failures, 0 errors/ to match "/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/rubygems_ext.rb:177: warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/rubygems_ext.rb:177: warning: previous definition of VALIDATES_FOR_RESOLUTION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: already initialized constant Bundler::FileUtils::VERSION\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:184: warning: previous definition of VERSION was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: already initialized constant Bundler::FileUtils::Entry_::S_IF_DOOR\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2152: warning: previous definition of S_IF_DOOR was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: already initialized constant Bundler::FileUtils::Entry_::DIRECTORY_TERM\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2448: warning: previous definition of DIRECTORY_TERM was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: already initialized constant Bundler::FileUtils::OPT_TABLE\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2564: warning: previous definition of OPT_TABLE was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: already initialized constant Bundler::FileUtils::LOW_METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2622: warning: previous definition of LOW_METHODS was here\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/gems/3.4.0/gems/bundler-4.0.0/lib/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: already initialized constant Bundler::FileUtils::METHODS\n/home/yahonda/.local/share/mise/installs/ruby/3.4.7/lib/ruby/site_ruby/3.4.0/bundler/vendor/fileutils/lib/fileutils.rb:2629: warning: previous definition of METHODS was here\nbin/rails aborted!\nArgumentError: Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (ArgumentError)\n/home/yahonda/src/github.com/rails/rails/railties/test/fixtures/tmp/bukkits/Rakefile:6:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:48:in 'block in Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:46:in 'Rails::Command::RakeCommand.with_rake'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/rake/rake_command.rb:20:in 'Rails::Command::RakeCommand.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:73:in 'Rails::Command::TestCommand#run_prepare_task'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands/test/test_command.rb:32:in 'Rails::Command::TestCommand#perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:176:in 'Rails::Command::Base#invoke_command'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command/base.rb:71:in 'Rails::Command::Base.perform'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:65:in 'block in Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:143:in 'Rails::Command.with_argv'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/command.rb:63:in 'Rails::Command.invoke'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/commands.rb:18:in '<top (required)>'\n/home/yahonda/src/github.com/rails/rails/railties/lib/rails/engine/commands.rb:9:in '<top (required)>'\nbin/rails:14:in '<main>'\n(See full trace by running task with --trace)\n".


bin/test test/generators/scaffold_generator_test.rb:572



Finished in 3.646300s, 0.2743 runs/s, 0.5485 assertions/s.
1 runs, 2 assertions, 1 failures, 0 errors, 0 skips
$

yahonda · 2025-12-09T02:04:14Z

Opened ruby/rubygems#9172

yahonda · 2025-12-09T05:04:16Z

This issue will be resolved when RubyGems and Bundler 4.0.1 is released including ruby/rubygems#9167

yahonda · 2025-12-09T05:04:45Z

Let me revisit this pull request later.

yahonda · 2025-12-09T07:27:39Z

RubyGems 4.0.1 has been released https://github.com/ruby/rubygems/releases/tag/v4.0.1 . Rebuilding the CI job https://buildkite.com/rails/buildkite-config/builds/488

yahonda · 2025-12-09T11:25:28Z

These CIs are green.

Rails CI using Ruby 3.2, 3.3 and 3.4 for main branch
https://buildkite.com/rails/rails-ci/builds/337
Rails CI Nightly build using rubylang/ruby:master and `rubylang/ruby:master-debug' for main branch
https://buildkite.com/rails/rails-ci-nightly/builds/51

While CI for 6-1-stable branches are red, that should not be relevant to this pull request.

https://buildkite.com/rails/rails-ci/builds/338
https://buildkite.com/rails/buildkite-config/builds/488

I think we should bump the branch to some newer stable branch since Rails 6.1 is already EOL, I do not know how to do yet.

yahonda · 2025-12-09T11:54:36Z

I think we should bump the branch to some newer stable branch since Rails 6.1 is already EOL, I do not know how to do yet.

Opened #154

yahonda mentioned this pull request Dec 8, 2025

Rails Nightly CI fails because of warning: already initialized constant Gem::VALIDATES_FOR_RESOLUTION rails/rails#56325

Open

byroot approved these changes Dec 8, 2025

View reviewed changes

yahonda mentioned this pull request Dec 9, 2025

require "bundler/gem_tasks" raises Trying to register Bundler::GemfileError for status code 4 but Bundler::GemfileError is already registered (ArgumentError) ruby/rubygems#9172

Closed

yahonda mentioned this pull request Dec 9, 2025

Bump the oldest branch to 7-0-stable #154

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Remove unnecessary bundler installation from Dockerfile #153

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Remove unnecessary bundler installation from Dockerfile #153

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