Remove external tool version checks from bundle env

Keeping up with each version manager's invocation convention is not
worth the maintenance cost. chruby in particular is wrapped as a shell
function and cannot be run as `chruby --version` at all, so the line
always reported a missing version.

#9528

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: hsbt

bundler/lib/bundler/env.rb

@@ -78,17 +78,6 @@ def self.git_version
       "not installed"
     end
 
-    def self.version_of(script)
-      return "not installed" unless Bundler.which(script)
-      `#{script} --version`.chomp
-    end
-
-    def self.chruby_version
-      return "not installed" unless Bundler.which("chruby-exec")
-      `chruby-exec -- chruby --version`.
-        sub(/.*^chruby: (#{Gem::Version::VERSION_PATTERN}).*/m, '\1')
-    end
-
     def self.environment
       out = []
 
@@ -110,16 +99,8 @@ def self.environment
         out << ["  Cert File", OpenSSL::X509::DEFAULT_CERT_FILE] if defined?(OpenSSL::X509::DEFAULT_CERT_FILE)
         out << ["  Cert Dir", OpenSSL::X509::DEFAULT_CERT_DIR] if defined?(OpenSSL::X509::DEFAULT_CERT_DIR)
       end
-      out << ["Tools"]
-      out << ["  Git", git_version]
-      out << ["  RVM", ENV.fetch("rvm_version") { version_of("rvm") }]
-      out << ["  rbenv", version_of("rbenv")]
-      out << ["  chruby", chruby_version]
-
-      %w[rubygems-bundler open_gem].each do |name|
-        specs = Bundler.rubygems.find_name(name)
-        out << ["  #{name}", "(#{specs.map(&:version).join(",")})"] unless specs.empty?
-      end
+      out << ["Git", git_version]
+
       if (exe = caller_locations.last.absolute_path)&.match? %r{(exe|bin)/bundler?\z}
         shebang = File.read(exe).lines.first
         shebang.sub!(/^#!\s*/, "")
@@ -143,6 +124,6 @@ def self.append_formatted_table(title, pairs, out)
       out << "```\n"
     end
 
-    private_class_method :read_file, :ruby_version, :git_version, :append_formatted_table, :version_of, :chruby_version
+    private_class_method :read_file, :ruby_version, :git_version, :append_formatted_table
   end
 end

spec/bundler/env_spec.rb

@@ -222,16 +222,8 @@ def with_clear_paths(env_var, env_value)
           and_return(["git version 1.2.3 (Apple Git-BS)", "", status])
         expect(Bundler::Source::Git::GitProxy).to receive(:new).and_return(git_proxy_stub)
 
-        expect(described_class.report).to include("Git         1.2.3 (Apple Git-BS)")
+        expect(described_class.report).to include("Git           1.2.3 (Apple Git-BS)")
       end
     end
   end
-
-  describe ".version_of" do
-    let(:parsed_version) { described_class.send(:version_of, "ruby") }
-
-    it "strips version of new line characters" do
-      expect(parsed_version).to_not end_with("\n")
-    end
-  end
 end