Revert "Merge pull request rails#49360 from skipkayhil/hm-gemfile-ruby-file"

This reverts commit 6985c3b, reversing
changes made to 3163bb7.

Reason: While we want to apply this change, it make bundle being more
strict about the ruby version. This is particularly problematic for
the devcontainer images that don't support defining which patch
version of ruby to install.

Right now, you can only say you want Ruby 3.2, which could mean
3.2.3 or 3.2.0. If for some reason the devcontainer image doesn't
match the patch version on `.ruby-version` it will fail to install.

We are planning to solve this problem by publishing our own
ruby images that allow defining the patch level, but until that
we can't apply this change.

Author: rafaelfranca

railties/CHANGELOG.md

@@ -1,7 +1,3 @@
-*   Use `ruby file: ".ruby-version"` in generated Gemfile if supported.
-
-    *Hartley McGuire*
-
 *   `bin/rails test` will no longer load files named `*_test.rb` if they are located in the `fixtures` folder.
 
     *Edouard Chin*

railties/lib/rails/generators/app_base.rb

@@ -436,20 +436,8 @@ def to_s
         end
       end
 
-      def gem_ruby_entry
-        if Gem::Version.new(Bundler::VERSION) >= Gem::Version.new("2.4.20") # add file: option to #ruby
-          'ruby file: ".ruby-version"'
-        else
-          "ruby \"#{gem_ruby_version}\""
-        end
-      end
-
       def gem_ruby_version
-        if Gem::Version.new(Gem::VERSION) >= Gem::Version.new("3.3.13") # patch level removed from Gem.ruby_version
-          Gem.ruby_version
-        else
-          RUBY_VERSION
-        end
+        Gem::Version.new(Gem::VERSION) >= Gem::Version.new("3.3.13") ? Gem.ruby_version : RUBY_VERSION
       end
 
       def rails_prerelease?

railties/lib/rails/generators/rails/app/templates/Dockerfile.tt

@@ -42,7 +42,7 @@ RUN curl -fsSL https://bun.sh/install | bash -s -- "bun-v${BUN_VERSION}"
 
 <% end -%>
 # Install application gems
-COPY .ruby-version Gemfile Gemfile.lock ./
+COPY Gemfile Gemfile.lock ./
 RUN bundle install && \
     rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git<% if depend_on_bootsnap? -%> && \
     bundle exec bootsnap precompile --gemfile<% end %>

railties/lib/rails/generators/rails/app/templates/Gemfile.tt

@@ -1,6 +1,6 @@
 source "https://rubygems.org"
 
-<%= gem_ruby_entry %>
+ruby <%= "\"#{gem_ruby_version}\"" -%>
 
 <% gemfile_entries.each do |gemfile_entry| -%>
 <%= gemfile_entry %>

railties/test/generators/app_generator_test.rb

@@ -1006,13 +1006,7 @@ def test_inclusion_of_ruby_version
     run_generator
 
     assert_file "Gemfile" do |content|
-      if Gem::Version.new(Bundler::VERSION) >= Gem::Version.new("2.4.20") # add file: option to #ruby
-        assert_match('ruby file: ".ruby-version"', content)
-      elsif Gem::Version.new(Gem::VERSION) >= Gem::Version.new("3.3.13") # patch level removed from Gem.ruby_version
-        assert_match("ruby \"#{Gem.ruby_version}\"", content)
-      else
-        assert_match("ruby \"#{RUBY_VERSION}\"", content)
-      end
+      assert_match(/ruby "#{Gem::Version.new(Gem::VERSION) >= Gem::Version.new("3.3.13") ? Gem.ruby_version : RUBY_VERSION}"/, content)
     end
     assert_file "Dockerfile" do |content|
       assert_match(/ARG RUBY_VERSION=#{Gem::Version.new(Gem::VERSION) >= Gem::Version.new("3.3.13") ? Gem.ruby_version : RUBY_VERSION}/, content)

railties/test/generators/generators_test_helper.rb

@@ -100,7 +100,7 @@ def evaluate_template_docker(file)
   private
     def gemfile_locals
       {
-        gem_ruby_entry: "ruby \"#{RUBY_VERSION}\"",
+        gem_ruby_version: RUBY_VERSION,
         rails_prerelease: false,
         skip_active_storage: true,
         depend_on_bootsnap: false,