rake bundler_2:install

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rails/rails#29675

Work In Progress

% ghq get \

https://github.com/bundler/bundler

% ghq look bundler/bundler

% rake bundler_2:install

% bundle -v

2.0.0.dev bin/bundle2

bundler/rfcs#6

Breaking Changes

% bundle update

To update everything, pass the `--all` flag.

% bundle

2.0.0.dev

Commands:

bundle add GEM VERSION

% bundle -v # 2.0.0.dev

% bundle install --path /tmp

Unknown switches '--path'

TODO:

See also: bundler/bundler#5912

% ag BUNDLE_GEMFILE

bin/rubocop

4:ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)

% bundle binstub rubocop --force

gems.rb

# VERSION ”2.0.99”

% bundle install

[DEPRECATED FOR 3.0] gems.rb and gems.locked will be preferred to Gemfile and Gemfile.lock.

# Bunlder 1 Gemfile.lock

% bundle update --all

Warning: the lockfile is being updated to Bundler 2, after which you will be unable to return to Bundler 1. See: bundler/bundler#5923

% bundle install

Resolving dependencies.....

rails (5.1.2) has dependency bundler (< 2.0, >= 1.3.0), which is unsatisfied by the current bundler version 2.0.99, so the dependency is being ignored

# bundler 1.x

% bundle -v

Bundler version 1.15.3

!

# bundler 2.x

% bundle -v

2.0.0.dev

ruby/ruby#1536

@koicまでどうぞ