Only reset settings when a gemfile is already set

Only thing we need to reset is settings, and only because settings are
loaded relative to the `Gemfile`, so they need to be reset if the
configured or passed `Gemfile` is not standard and will resolve to a
different root.

Resetting more stuff causes issues under some circumstances,
specifically when dependencies further tweak `Kernel.require`.

bundler/lib/bundler.rb

@@ -602,6 +602,10 @@ def reset!
       reset_rubygems!
     end
 
+    def reset_settings!
+      @settings = nil
+    end
+
     def reset_paths!
       @bin_path = nil
       @bundler_major_version = nil

bundler/lib/bundler/cli.rb

@@ -57,7 +57,7 @@ def initialize(*args)
       custom_gemfile = options[:gemfile] || Bundler.settings[:gemfile]
       if custom_gemfile && !custom_gemfile.empty?
         Bundler::SharedHelpers.set_env "BUNDLE_GEMFILE", File.expand_path(custom_gemfile)
-        Bundler.reset_paths!
+        Bundler.reset_settings!
       end
 
       Bundler.settings.set_command_option_if_given :retry, options[:retry]

bundler/spec/commands/exec_spec.rb

@@ -887,6 +887,64 @@ def bin_path(a,b,c)
       end
     end
 
+    context "when a gem monkey patches require" do
+      before do
+        skip "https://github.com/rubygems/rubygems/issues/3351" if Gem.win_platform?
+
+        build_repo2 do
+          build_gem "zeitwerk" do |s|
+            s.write("lib/zeitwerk.rb", <<~'RUBY')
+              module Kernel
+                module_function
+
+                alias_method :zeitwerk_original_require, :require
+
+                def require(path)
+                  puts "#{path} used further decorated require"
+
+                  zeitwerk_original_require(path)
+                end
+              end
+            RUBY
+          end
+        end
+
+        install_gemfile <<-G
+          source "#{file_uri_for(gem_repo2)}"
+
+          gem "zeitwerk"
+        G
+      end
+
+      it "does not undo the monkeypatch when `bundle exec`'ing again" do
+        karafka = bundled_app("bin/karafka")
+        create_file(karafka, <<~RUBY)
+          #!#{Gem.ruby}
+
+          # to setup require decorator
+          require "zeitwerk"
+
+          # to setup bundler
+          Bundler.setup(:default)
+
+          # to make sure decorator is still used
+          require "foo"
+        RUBY
+        karafka.chmod(0o777)
+
+        foreman = bundled_app("bin/foreman")
+        create_file(foreman, <<~RUBY)
+          #!#{Gem.ruby}
+
+          puts `bundle exec ./bin/karafka`
+        RUBY
+        foreman.chmod(0o777)
+
+        bundle "exec #{foreman}"
+        expect(out).to eq("foo used further decorated require")
+      end
+    end
+
     context "with a system gem that shadows a default gem" do
       let(:openssl_version) { "99.9.9" }
       let(:expected) { ruby "gem 'openssl', '< 999999'; require 'openssl'; puts OpenSSL::VERSION", :artifice => nil, :raise_on_error => false }