This hits the ones that are most frequently required.lcg/require-idempotency

Stops the kernel from scanning through all the activated gems every time in order
to resolve names into pathnames.

See rubygems/rubygems#2762

Signed-off-by: Lamont Granquist <lamont@scriptkiddie.org>

143 files changed, 203 insertions, 203 deletions

diff --git a/lib/chef/api_client/registration.rb b/lib/chef/api_client/registration.rb
index 21ce6f9179..2f50983032 100644
--- a/lib/chef/api_client/registration.rb
+++ b/lib/chef/api_client/registration.rb
@@ -19,7 +19,7 @@
 require_relative "../config"
 require_relative "../server_api"
 require_relative "../exceptions"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 
 class Chef
   class ApiClient
diff --git a/lib/chef/application.rb b/lib/chef/application.rb
index 7a69d549c4..3093d358ea 100644
--- a/lib/chef/application.rb
+++ b/lib/chef/application.rb
@@ -16,16 +16,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-require "pp"
-require "socket"
+require "pp" unless defined?(PP)
+require "socket" unless defined?(Socket)
 require_relative "config"
 require_relative "config_fetcher"
 require_relative "exceptions"
 require_relative "local_mode"
 require_relative "log"
 require_relative "platform"
-require "mixlib/cli"
-require "tmpdir"
+require "mixlib/cli" unless defined?(Mixlib::CLI)
+require "tmpdir" unless defined?(Dir.mktmpdir)
 require "rbconfig"
 require_relative "application/exit_code"
 require_relative "dist"
diff --git a/lib/chef/application/apply.rb b/lib/chef/application/apply.rb
index 275fe19f93..1a9b115632 100644
--- a/lib/chef/application/apply.rb
+++ b/lib/chef/application/apply.rb
@@ -22,8 +22,8 @@ require_relative "../application"
 require_relative "../client"
 require_relative "../config"
 require_relative "../log"
-require "fileutils"
-require "tempfile"
+require "fileutils" unless defined?(FileUtils)
+require "tempfile" unless defined?(Tempfile)
 require_relative "../providers"
 require_relative "../resources"
 require_relative "../dist"
diff --git a/lib/chef/application/client.rb b/lib/chef/application/client.rb
index ab358fdcb6..9ba1502409 100644
--- a/lib/chef/application/client.rb
+++ b/lib/chef/application/client.rb
@@ -27,8 +27,8 @@ require_relative "../handler/error_report"
 require_relative "../workstation_config_loader"
 require_relative "../mixin/shell_out"
 require "chef-config/mixin/dot_d"
-require "mixlib/archive"
-require "uri"
+require "mixlib/archive" unless defined?(Mixlib::Archive)
+require "uri" unless defined?(URI)
 require_relative "../dist"
 require "license_acceptance/cli_flags/mixlib_cli"
 
diff --git a/lib/chef/application/solo.rb b/lib/chef/application/solo.rb
index 5cfcce9553..f11654ddd5 100644
--- a/lib/chef/application/solo.rb
+++ b/lib/chef/application/solo.rb
@@ -24,11 +24,11 @@ require_relative "../config"
 require_relative "../daemon"
 require_relative "../log"
 require_relative "../config_fetcher"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 require_relative "../mixin/shell_out"
-require "pathname"
+require "pathname" unless defined?(Pathname)
 require "chef-config/mixin/dot_d"
-require "mixlib/archive"
+require "mixlib/archive" unless defined?(Mixlib::Archive)
 require_relative "../dist"
 require "license_acceptance/cli_flags/mixlib_cli"
 
diff --git a/lib/chef/application/windows_service.rb b/lib/chef/application/windows_service.rb
index ebf7533956..e0df23371c 100644
--- a/lib/chef/application/windows_service.rb
+++ b/lib/chef/application/windows_service.rb
@@ -24,9 +24,9 @@ require_relative "../config"
 require_relative "../handler/error_report"
 require_relative "../log"
 require_relative "../http"
-require "mixlib/cli"
-require "socket"
-require "uri"
+require "mixlib/cli" unless defined?(Mixlib::CLI)
+require "socket" unless defined?(Socket)
+require "uri" unless defined?(URI)
 require "win32/daemon"
 require_relative "../mixin/shell_out"
 require_relative "../dist"
diff --git a/lib/chef/application/windows_service_manager.rb b/lib/chef/application/windows_service_manager.rb
index 4a2bfa258e..2921c3d964 100644
--- a/lib/chef/application/windows_service_manager.rb
+++ b/lib/chef/application/windows_service_manager.rb
@@ -20,7 +20,7 @@ if RUBY_PLATFORM =~ /mswin|mingw32|windows/
   require "win32/service"
 end
 require_relative "../config"
-require "mixlib/cli"
+require "mixlib/cli" unless defined?(Mixlib::CLI)
 require_relative "../dist"
 
 class Chef
diff --git a/lib/chef/chef_fs/chef_fs_data_store.rb b/lib/chef/chef_fs/chef_fs_data_store.rb
index b00c28e252..50badef794 100644
--- a/lib/chef/chef_fs/chef_fs_data_store.rb
+++ b/lib/chef/chef_fs/chef_fs_data_store.rb
@@ -24,7 +24,7 @@ require_relative "file_pattern"
 require_relative "file_system"
 require_relative "file_system/exceptions"
 require_relative "file_system/memory/memory_root"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 
 class Chef
   module ChefFS
diff --git a/lib/chef/chef_fs/file_system/chef_server/cookbook_file.rb b/lib/chef/chef_fs/file_system/chef_server/cookbook_file.rb
index 0ee277abea..8bdaf75a30 100644
--- a/lib/chef/chef_fs/file_system/chef_server/cookbook_file.rb
+++ b/lib/chef/chef_fs/file_system/chef_server/cookbook_file.rb
@@ -18,7 +18,7 @@
 
 require_relative "../base_fs_object"
 require_relative "../../../http/simple"
-require "openssl"
+require "openssl" unless defined?(OpenSSL)
 
 class Chef
   module ChefFS
diff --git a/lib/chef/chef_fs/file_system/chef_server/cookbooks_dir.rb b/lib/chef/chef_fs/file_system/chef_server/cookbooks_dir.rb
index c1bd3e5812..dfacc7f5ec 100644
--- a/lib/chef/chef_fs/file_system/chef_server/cookbooks_dir.rb
+++ b/lib/chef/chef_fs/file_system/chef_server/cookbooks_dir.rb
@@ -22,7 +22,7 @@ require_relative "../exceptions"
 require_relative "../repository/chef_repository_file_system_cookbook_dir"
 require_relative "../../../mixin/file_class"
 
-require "tmpdir"
+require "tmpdir" unless defined?(Dir.mktmpdir)
 
 class Chef
   module ChefFS
diff --git a/lib/chef/chef_fs/file_system/repository/file_system_entry.rb b/lib/chef/chef_fs/file_system/repository/file_system_entry.rb
index f015dc9e51..33b4de8014 100644
--- a/lib/chef/chef_fs/file_system/repository/file_system_entry.rb
+++ b/lib/chef/chef_fs/file_system/repository/file_system_entry.rb
@@ -20,7 +20,7 @@ require_relative "../base_fs_dir"
 require_relative "../chef_server/rest_list_dir"
 require_relative "../exceptions"
 require_relative "../../path_utils"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 
 class Chef
   module ChefFS
diff --git a/lib/chef/chef_fs/file_system_cache.rb b/lib/chef/chef_fs/file_system_cache.rb
index fe7c600ab3..e36dbbce7c 100644
--- a/lib/chef/chef_fs/file_system_cache.rb
+++ b/lib/chef/chef_fs/file_system_cache.rb
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-require "singleton"
+require "singleton" unless defined?(Singleton)
 require_relative "../client"
 
 class Chef
diff --git a/lib/chef/chef_fs/knife.rb b/lib/chef/chef_fs/knife.rb
index 47f34225b7..18a2958cb5 100644
--- a/lib/chef/chef_fs/knife.rb
+++ b/lib/chef/chef_fs/knife.rb
@@ -17,7 +17,7 @@
 #
 
 require_relative "../knife"
-require "pathname"
+require "pathname" unless defined?(Pathname)
 
 class Chef
   module ChefFS
diff --git a/lib/chef/chef_fs/path_utils.rb b/lib/chef/chef_fs/path_utils.rb
index 6389fe4d2f..fe6428a5b1 100644
--- a/lib/chef/chef_fs/path_utils.rb
+++ b/lib/chef/chef_fs/path_utils.rb
@@ -17,7 +17,7 @@
 #
 
 require_relative "../chef_fs"
-require "pathname"
+require "pathname" unless defined?(Pathname)
 
 class Chef
   module ChefFS
diff --git a/lib/chef/client.rb b/lib/chef/client.rb
index eb42b58890..51a93440e9 100644
--- a/lib/chef/client.rb
+++ b/lib/chef/client.rb
@@ -52,10 +52,10 @@ require_relative "policy_builder"
 require_relative "request_id"
 require_relative "platform/rebooter"
 require_relative "mixin/deprecation"
-require "ohai"
+require "ohai" unless defined?(Ohai::System)
 require "rbconfig"
 require_relative "dist"
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 class Chef
   # == Chef::Client
diff --git a/lib/chef/cookbook/gem_installer.rb b/lib/chef/cookbook/gem_installer.rb
index 830dce757a..bd1d0fb93a 100644
--- a/lib/chef/cookbook/gem_installer.rb
+++ b/lib/chef/cookbook/gem_installer.rb
@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-require "tmpdir"
+require "tmpdir" unless defined?(Dir.mktmpdir)
 require_relative "../mixin/shell_out"
 
 class Chef
diff --git a/lib/chef/cookbook/synchronizer.rb b/lib/chef/cookbook/synchronizer.rb
index b1fa1b436d..8c87ababb6 100644
--- a/lib/chef/cookbook/synchronizer.rb
+++ b/lib/chef/cookbook/synchronizer.rb
@@ -16,7 +16,7 @@
 require_relative "../client"
 require_relative "../util/threaded_job_queue"
 require_relative "../server_api"
-require "singleton"
+require "singleton" unless defined?(Singleton)
 require_relative "../dist"
 
 class Chef
diff --git a/lib/chef/cookbook/syntax_check.rb b/lib/chef/cookbook/syntax_check.rb
index 8743e07caf..89061d4f5f 100644
--- a/lib/chef/cookbook/syntax_check.rb
+++ b/lib/chef/cookbook/syntax_check.rb
@@ -15,9 +15,9 @@
 # limitations under the License.
 #
 
-require "pathname"
-require "stringio"
-require "erubis"
+require "pathname" unless defined?(Pathname)
+require "stringio" unless defined?(StringIO)
+require "erubis" unless defined?(Erubis)
 require_relative "../mixin/shell_out"
 require_relative "../mixin/checksum"
 require_relative "../util/path_helper"
diff --git a/lib/chef/cookbook_manifest.rb b/lib/chef/cookbook_manifest.rb
index 2633dfa8ba..e061d9ef32 100644
--- a/lib/chef/cookbook_manifest.rb
+++ b/lib/chef/cookbook_manifest.rb
@@ -14,7 +14,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 require_relative "mixin/versioned_api"
 require_relative "util/path_helper"
 require_relative "cookbook/manifest_v0"
diff --git a/lib/chef/cookbook_site_streaming_uploader.rb b/lib/chef/cookbook_site_streaming_uploader.rb
index fdd8f690ae..cd66a5048b 100644
--- a/lib/chef/cookbook_site_streaming_uploader.rb
+++ b/lib/chef/cookbook_site_streaming_uploader.rb
@@ -18,10 +18,10 @@
 # limitations under the License.
 #
 
-require "uri"
-require "net/http"
+require "uri" unless defined?(URI)
+require "net/http" unless defined?(Net::HTTP)
 require "mixlib/authentication/signedheaderauth"
-require "openssl"
+require "openssl" unless defined?(OpenSSL)
 
 class Chef
   # == Chef::CookbookSiteStreamingUploader
diff --git a/lib/chef/cookbook_uploader.rb b/lib/chef/cookbook_uploader.rb
index e2393b91f6..9aeecf7716 100644
--- a/lib/chef/cookbook_uploader.rb
+++ b/lib/chef/cookbook_uploader.rb
@@ -1,5 +1,5 @@
 
-require "set"
+require "set" unless defined?(Set)
 require_relative "exceptions"
 require_relative "knife/cookbook_metadata"
 require_relative "digester"
diff --git a/lib/chef/daemon.rb b/lib/chef/daemon.rb
index 9fdfe6481f..64c451a26c 100644
--- a/lib/chef/daemon.rb
+++ b/lib/chef/daemon.rb
@@ -19,7 +19,7 @@
 
 require_relative "config"
 require_relative "run_lock"
-require "etc"
+require "etc" unless defined?(Etc)
 
 class Chef
   class Daemon
diff --git a/lib/chef/data_bag_item.rb b/lib/chef/data_bag_item.rb
index 95626a346a..7ac76d9ebb 100644
--- a/lib/chef/data_bag_item.rb
+++ b/lib/chef/data_bag_item.rb
@@ -18,7 +18,7 @@
 # limitations under the License.
 #
 
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 require_relative "config"
 require_relative "mixin/params_validate"
diff --git a/lib/chef/data_collector.rb b/lib/chef/data_collector.rb
index 167b9f5d54..eb349be928 100644
--- a/lib/chef/data_collector.rb
+++ b/lib/chef/data_collector.rb
@@ -21,7 +21,7 @@
 require_relative "server_api"
 require_relative "http/simple_json"
 require_relative "event_dispatch/base"
-require "set"
+require "set" unless defined?(Set)
 require_relative "data_collector/run_end_message"
 require_relative "data_collector/run_start_message"
 require_relative "data_collector/config_validation"
diff --git a/lib/chef/data_collector/config_validation.rb b/lib/chef/data_collector/config_validation.rb
index 670b59dd80..72cc121df4 100644
--- a/lib/chef/data_collector/config_validation.rb
+++ b/lib/chef/data_collector/config_validation.rb
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-require "uri"
+require "uri" unless defined?(URI)
 
 class Chef
   class DataCollector
diff --git a/lib/chef/digester.rb b/lib/chef/digester.rb
index 6e4588a661..2c1c459ac1 100644
--- a/lib/chef/digester.rb
+++ b/lib/chef/digester.rb
@@ -18,8 +18,8 @@
 # limitations under the License.
 #
 
-require "openssl"
-require "singleton"
+require "openssl" unless defined?(OpenSSL)
+require "singleton" unless defined?(Singleton)
 
 class Chef
   class Digester
diff --git a/lib/chef/encrypted_data_bag_item/decryptor.rb b/lib/chef/encrypted_data_bag_item/decryptor.rb
index 4d34208ab1..ce7cdc4036 100644
--- a/lib/chef/encrypted_data_bag_item/decryptor.rb
+++ b/lib/chef/encrypted_data_bag_item/decryptor.rb
@@ -18,9 +18,9 @@
 
 require "yaml"
 require_relative "../json_compat"
-require "openssl"
+require "openssl" unless defined?(OpenSSL)
 require "base64"
-require "digest/sha2"
+require "digest/sha2" unless defined?(Digest::SHA2)
 require_relative "../encrypted_data_bag_item"
 require_relative "unsupported_encrypted_data_bag_item_format"
 require_relative "decryption_failure"
diff --git a/lib/chef/encrypted_data_bag_item/encryptor.rb b/lib/chef/encrypted_data_bag_item/encryptor.rb
index 17e22b8897..514633b526 100644
--- a/lib/chef/encrypted_data_bag_item/encryptor.rb
+++ b/lib/chef/encrypted_data_bag_item/encryptor.rb
@@ -17,9 +17,9 @@
 #
 
 require "base64"
-require "digest/sha2"
-require "openssl"
-require "ffi_yajl"
+require "digest/sha2" unless defined?(Digest::SHA2)
+require "openssl" unless defined?(OpenSSL)
+require "ffi_yajl" unless defined?(FFI_Yajl)
 require_relative "../encrypted_data_bag_item"
 require_relative "unsupported_encrypted_data_bag_item_format"
 require_relative "encryption_failure"
diff --git a/lib/chef/file_cache.rb b/lib/chef/file_cache.rb
index 9403c9b7db..ad271a9192 100644
--- a/lib/chef/file_cache.rb
+++ b/lib/chef/file_cache.rb
@@ -19,7 +19,7 @@ require_relative "mixin/params_validate"
 require_relative "mixin/create_path"
 require_relative "exceptions"
 require_relative "json_compat"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 require_relative "util/path_helper"
 
 class Chef
diff --git a/lib/chef/file_content_management/tempfile.rb b/lib/chef/file_content_management/tempfile.rb
index c3bf07d92b..3e57a131a6 100644
--- a/lib/chef/file_content_management/tempfile.rb
+++ b/lib/chef/file_content_management/tempfile.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "tempfile"
+require "tempfile" unless defined?(Tempfile)
 
 class Chef
   class FileContentManagement
diff --git a/lib/chef/handler.rb b/lib/chef/handler.rb
index 775ddd6d89..6fabe98d1f 100644
--- a/lib/chef/handler.rb
+++ b/lib/chef/handler.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 require_relative "client"
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 class Chef
   # The base class for an Exception or Notification Handler. Create your own
diff --git a/lib/chef/http.rb b/lib/chef/http.rb
index ab78ff7ae4..f5ad71c694 100644
--- a/lib/chef/http.rb
+++ b/lib/chef/http.rb
@@ -21,9 +21,9 @@
 # limitations under the License.
 #
 
-require "tempfile"
+require "tempfile" unless defined?(Tempfile)
 require "net/https"
-require "uri"
+require "uri" unless defined?(URI)
 require_relative "http/basic_client"
 require_relative "monkey_patches/net_http"
 require_relative "config"
diff --git a/lib/chef/http/authenticator.rb b/lib/chef/http/authenticator.rb
index 6b059c9733..1e302f5173 100644
--- a/lib/chef/http/authenticator.rb
+++ b/lib/chef/http/authenticator.rb
@@ -18,7 +18,7 @@
 
 require_relative "auth_credentials"
 require_relative "../exceptions"
-require "openssl"
+require "openssl" unless defined?(OpenSSL)
 
 class Chef
   class HTTP
diff --git a/lib/chef/http/basic_client.rb b/lib/chef/http/basic_client.rb
index a599f2219e..3cbfc8c968 100644
--- a/lib/chef/http/basic_client.rb
+++ b/lib/chef/http/basic_client.rb
@@ -20,8 +20,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-require "uri"
-require "net/http"
+require "uri" unless defined?(URI)
+require "net/http" unless defined?(Net::HTTP)
 require_relative "ssl_policies"
 require_relative "http_request"
 
diff --git a/lib/chef/http/cookie_jar.rb b/lib/chef/http/cookie_jar.rb
index 4908fde0c9..5d54fa2c4d 100644
--- a/lib/chef/http/cookie_jar.rb
+++ b/lib/chef/http/cookie_jar.rb
@@ -20,7 +20,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-require "singleton"
+require "singleton" unless defined?(Singleton)
 
 class Chef
   class HTTP
diff --git a/lib/chef/http/http_request.rb b/lib/chef/http/http_request.rb
index a8549b32da..566d05fa84 100644
--- a/lib/chef/http/http_request.rb
+++ b/lib/chef/http/http_request.rb
@@ -20,8 +20,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-require "uri"
-require "net/http"
+require "uri" unless defined?(URI)
+require "net/http" unless defined?(Net::HTTP)
 require_relative "../dist"
 
 # To load faster, we only want ohai's version string.
@@ -30,7 +30,7 @@ require_relative "../dist"
 begin
   require "ohai/version" # used in user agent string.
 rescue LoadError
-  require "ohai"
+  require "ohai" unless defined?(Ohai::System)
 end
 
 require_relative "../version"
diff --git a/lib/chef/http/ssl_policies.rb b/lib/chef/http/ssl_policies.rb
index 2708e5b3b1..3f7dd34404 100644
--- a/lib/chef/http/ssl_policies.rb
+++ b/lib/chef/http/ssl_policies.rb
@@ -21,7 +21,7 @@
 # limitations under the License.
 #
 
-require "openssl"
+require "openssl" unless defined?(OpenSSL)
 require_relative "../util/path_helper"
 
 class Chef
diff --git a/lib/chef/http/validate_content_length.rb b/lib/chef/http/validate_content_length.rb
index e24ebc0dd5..1b1a8a398a 100644
--- a/lib/chef/http/validate_content_length.rb
+++ b/lib/chef/http/validate_content_length.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "pp"
+require "pp" unless defined?(PP)
 require_relative "../log"
 
 class Chef
diff --git a/lib/chef/json_compat.rb b/lib/chef/json_compat.rb
index e7720e9e2a..13a2c43dbb 100644
--- a/lib/chef/json_compat.rb
+++ b/lib/chef/json_compat.rb
@@ -17,7 +17,7 @@
 
 # Wrapper class for interacting with JSON.
 
-require "ffi_yajl"
+require "ffi_yajl" unless defined?(FFI_Yajl)
 require_relative "exceptions"
 # We're requiring this to prevent breaking consumers using Hash.to_json
 require "json"
diff --git a/lib/chef/knife.rb b/lib/chef/knife.rb
index 23a0f8ff4a..5057fd5880 100644
--- a/lib/chef/knife.rb
+++ b/lib/chef/knife.rb
@@ -17,9 +17,9 @@
 # limitations under the License.
 #
 
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 require_relative "version"
-require "mixlib/cli"
+require "mixlib/cli" unless defined?(Mixlib::CLI)
 require_relative "workstation_config_loader"
 require_relative "mixin/convert_to_class_name"
 require_relative "mixin/path_sanity"
@@ -30,7 +30,7 @@ require_relative "server_api"
 require_relative "http/authenticator"
 require_relative "http/http_request"
 require_relative "http"
-require "pp"
+require "pp" unless defined?(PP)
 require_relative "dist"
 
 class Chef
diff --git a/lib/chef/knife/bootstrap.rb b/lib/chef/knife/bootstrap.rb
index 2a9eab6f8e..d65d9da396 100644
--- a/lib/chef/knife/bootstrap.rb
+++ b/lib/chef/knife/bootstrap.rb
@@ -395,7 +395,7 @@ class Chef
       attr_reader :connection
 
       deps do
-        require "erubis"
+        require "erubis" unless defined?(Erubis)
 
         require_relative "../json_compat"
         require_relative "../util/path_helper"
diff --git a/lib/chef/knife/bootstrap/client_builder.rb b/lib/chef/knife/bootstrap/client_builder.rb
index 1864297053..87dd03d6ed 100644
--- a/lib/chef/knife/bootstrap/client_builder.rb
+++ b/lib/chef/knife/bootstrap/client_builder.rb
@@ -20,7 +20,7 @@ require_relative "../../node"
 require_relative "../../server_api"
 require_relative "../../api_client/registration"
 require_relative "../../api_client"
-require "tmpdir"
+require "tmpdir" unless defined?(Dir.mktmpdir)
 
 class Chef
   class Knife
diff --git a/lib/chef/knife/bootstrap/train_connector.rb b/lib/chef/knife/bootstrap/train_connector.rb
index f1b4816049..af09a8c366 100644
--- a/lib/chef/knife/bootstrap/train_connector.rb
+++ b/lib/chef/knife/bootstrap/train_connector.rb
@@ -16,8 +16,8 @@
 #
 
 require "train"
-require "tempfile"
-require "uri"
+require "tempfile" unless defined?(Tempfile)
+require "uri" unless defined?(URI)
 
 class Chef
   class Knife
@@ -305,7 +305,7 @@ class Chef
         # Having this as a method makes it easier to mock
         # SSH Config for testing.
         def ssh_config_for_host(host)
-          require "net/ssh"
+          require "net/ssh" unless defined?(Net::SSH)
           Net::SSH::Config.for(host)
         end
       end
diff --git a/lib/chef/knife/config_use_profile.rb b/lib/chef/knife/config_use_profile.rb
index a202c8cf2a..89d75b3369 100644
--- a/lib/chef/knife/config_use_profile.rb
+++ b/lib/chef/knife/config_use_profile.rb
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 
 require_relative "../knife"
 
diff --git a/lib/chef/knife/configure.rb b/lib/chef/knife/configure.rb
index 0e523584fb..5ff5d96aa0 100644
--- a/lib/chef/knife/configure.rb
+++ b/lib/chef/knife/configure.rb
@@ -26,7 +26,7 @@ class Chef
       attr_reader :chef_repo, :new_client_key, :validation_client_name, :validation_key
 
       deps do
-        require "ohai"
+        require "ohai" unless defined?(Ohai::System)
         Chef::Knife::ClientCreate.load_deps
         Chef::Knife::UserCreate.load_deps
       end
diff --git a/lib/chef/knife/cookbook_show.rb b/lib/chef/knife/cookbook_show.rb
index d7855f63ba..9129e61e7e 100644
--- a/lib/chef/knife/cookbook_show.rb
+++ b/lib/chef/knife/cookbook_show.rb
@@ -24,7 +24,7 @@ class Chef
 
       deps do
         require_relative "../json_compat"
-        require "uri"
+        require "uri" unless defined?(URI)
         require_relative "../cookbook_version"
       end
 
diff --git a/lib/chef/knife/core/bootstrap_context.rb b/lib/chef/knife/core/bootstrap_context.rb
index 759fb043c0..997ebd5f28 100644
--- a/lib/chef/knife/core/bootstrap_context.rb
+++ b/lib/chef/knife/core/bootstrap_context.rb
@@ -18,7 +18,7 @@
 
 require_relative "../../run_list"
 require_relative "../../util/path_helper"
-require "pathname"
+require "pathname" unless defined?(Pathname)
 require_relative "../../dist"
 
 class Chef
diff --git a/lib/chef/knife/core/gem_glob_loader.rb b/lib/chef/knife/core/gem_glob_loader.rb
index b5b9143552..41d85b83a4 100644
--- a/lib/chef/knife/core/gem_glob_loader.rb
+++ b/lib/chef/knife/core/gem_glob_loader.rb
@@ -39,7 +39,7 @@ class Chef
         # subcommand loader has been modified to load the plugins by using Kernel.load
         # with the absolute path.
         def gem_and_builtin_subcommands
-          require "rubygems"
+          require "rubygems" unless defined?(Gem)
           find_subcommands_via_rubygems
         rescue LoadError
           find_subcommands_via_dirglob
diff --git a/lib/chef/knife/core/generic_presenter.rb b/lib/chef/knife/core/generic_presenter.rb
index 77c874e71a..96a4c766a5 100644
--- a/lib/chef/knife/core/generic_presenter.rb
+++ b/lib/chef/knife/core/generic_presenter.rb
@@ -89,7 +89,7 @@ class Chef
             require "yaml"
             YAML.dump(data)
           when :pp
-            require "stringio"
+            require "stringio" unless defined?(StringIO)
             # If you were looking for some attribute and there is only one match
             # just dump the attribute value
             if config[:attribute] && data.length == 1
diff --git a/lib/chef/knife/core/object_loader.rb b/lib/chef/knife/core/object_loader.rb
index d87b3eaf71..94b956be04 100644
--- a/lib/chef/knife/core/object_loader.rb
+++ b/lib/chef/knife/core/object_loader.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "ffi_yajl"
+require "ffi_yajl" unless defined?(FFI_Yajl)
 require_relative "../../util/path_helper"
 require_relative "../../data_bag_item"
 
diff --git a/lib/chef/knife/core/ui.rb b/lib/chef/knife/core/ui.rb
index cbda9c20f5..7961e1b523 100644
--- a/lib/chef/knife/core/ui.rb
+++ b/lib/chef/knife/core/ui.rb
@@ -18,10 +18,10 @@
 # limitations under the License.
 #
 
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 require_relative "../../platform/query_helpers"
 require_relative "generic_presenter"
-require "tempfile"
+require "tempfile" unless defined?(Tempfile)
 
 class Chef
   class Knife
diff --git a/lib/chef/knife/data_bag_secret_options.rb b/lib/chef/knife/data_bag_secret_options.rb
index 19b0dfca38..d04be7d448 100644
--- a/lib/chef/knife/data_bag_secret_options.rb
+++ b/lib/chef/knife/data_bag_secret_options.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "mixlib/cli"
+require "mixlib/cli" unless defined?(Mixlib::CLI)
 require_relative "../config"
 require_relative "../encrypted_data_bag_item/check_encrypted"
 
diff --git a/lib/chef/knife/search.rb b/lib/chef/knife/search.rb
index bca6e9a886..b2aa7b5dc9 100644
--- a/lib/chef/knife/search.rb
+++ b/lib/chef/knife/search.rb
@@ -18,7 +18,7 @@
 
 require_relative "../knife"
 require_relative "core/node_presenter"
-require "addressable/uri"
+require "addressable/uri" unless defined?(Addressable::URI)
 
 class Chef
   class Knife
diff --git a/lib/chef/knife/ssh.rb b/lib/chef/knife/ssh.rb
index b829a21969..a3cda96fb5 100644
--- a/lib/chef/knife/ssh.rb
+++ b/lib/chef/knife/ssh.rb
@@ -24,13 +24,13 @@ class Chef
     class Ssh < Knife
 
       deps do
-        require "net/ssh"
+        require "net/ssh" unless defined?(Net::SSH)
         require "net/ssh/multi"
         require "readline"
         require_relative "../exceptions"
         require_relative "../search/query"
         require_relative "../util/path_helper"
-        require "mixlib/shellout"
+        require "mixlib/shellout" unless defined?(Mixlib::ShellOut)
       end
 
       include Chef::Mixin::ShellOut
@@ -498,7 +498,7 @@ class Chef
 
       def macterm
         begin
-          require "appscript"
+          require "appscript" unless defined?(Appscript)
         rescue LoadError
           STDERR.puts "You need the rb-appscript gem to use knife ssh macterm. `(sudo) gem install rb-appscript` to install"
           raise
diff --git a/lib/chef/knife/ssl_check.rb b/lib/chef/knife/ssl_check.rb
index 9a27261124..46a1f2f3b0 100644
--- a/lib/chef/knife/ssl_check.rb
+++ b/lib/chef/knife/ssl_check.rb
@@ -24,11 +24,11 @@ class Chef
     class SslCheck < Chef::Knife
 
       deps do
-        require "pp"
-        require "socket"
-        require "uri"
+        require "pp" unless defined?(PP)
+        require "socket" unless defined?(Socket)
+        require "uri" unless defined?(URI)
         require_relative "../http/ssl_policies"
-        require "openssl"
+        require "openssl" unless defined?(OpenSSL)
         require_relative "../mixin/proxified_socket"
         include Chef::Mixin::ProxifiedSocket
       end
diff --git a/lib/chef/knife/ssl_fetch.rb b/lib/chef/knife/ssl_fetch.rb
index 9b6b364d8f..3f6a466881 100644
--- a/lib/chef/knife/ssl_fetch.rb
+++ b/lib/chef/knife/ssl_fetch.rb
@@ -24,10 +24,10 @@ class Chef
     class SslFetch < Chef::Knife
 
       deps do
-        require "pp"
-        require "socket"
-        require "uri"
-        require "openssl"
+        require "pp" unless defined?(PP)
+        require "socket" unless defined?(Socket)
+        require "uri" unless defined?(URI)
+        require "openssl" unless defined?(OpenSSL)
         require_relative "../mixin/proxified_socket"
         include Chef::Mixin::ProxifiedSocket
       end
diff --git a/lib/chef/knife/supermarket_download.rb b/lib/chef/knife/supermarket_download.rb
index abb65a9c1b..b48126151f 100644
--- a/lib/chef/knife/supermarket_download.rb
+++ b/lib/chef/knife/supermarket_download.rb
@@ -26,7 +26,7 @@ class Chef
       category "supermarket"
 
       deps do
-        require "fileutils"
+        require "fileutils" unless defined?(FileUtils)
       end
 
       option :file,
diff --git a/lib/chef/knife/supermarket_install.rb b/lib/chef/knife/supermarket_install.rb
index ab88170245..f47917e13d 100644
--- a/lib/chef/knife/supermarket_install.rb
+++ b/lib/chef/knife/supermarket_install.rb
@@ -24,8 +24,8 @@ class Chef
     class SupermarketInstall < Knife
 
       deps do
-        require "shellwords"
-        require "mixlib/archive"
+        require "shellwords" unless defined?(Shellwords)
+        require "mixlib/archive" unless defined?(Mixlib::Archive)
         require_relative "core/cookbook_scm_repo"
         require_relative "../cookbook/metadata"
       end
diff --git a/lib/chef/mixin/checksum.rb b/lib/chef/mixin/checksum.rb
index 74607da04b..5394c5ea48 100644
--- a/lib/chef/mixin/checksum.rb
+++ b/lib/chef/mixin/checksum.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "digest/sha2"
+require "digest/sha2" unless defined?(Digest::SHA2)
 require_relative "../digester"
 
 class Chef
diff --git a/lib/chef/mixin/homebrew_user.rb b/lib/chef/mixin/homebrew_user.rb
index 9e619c3c47..7703538ff7 100644
--- a/lib/chef/mixin/homebrew_user.rb
+++ b/lib/chef/mixin/homebrew_user.rb
@@ -23,7 +23,7 @@
 # awkward to use modules elsewhere (e.g., chef/provider/package/homebrew/owner)
 
 require_relative "shell_out"
-require "etc"
+require "etc" unless defined?(Etc)
 
 class Chef
   module Mixin
diff --git a/lib/chef/mixin/shell_out.rb b/lib/chef/mixin/shell_out.rb
index a7272c0bf3..f439323411 100644
--- a/lib/chef/mixin/shell_out.rb
+++ b/lib/chef/mixin/shell_out.rb
@@ -15,7 +15,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-require "mixlib/shellout"
+require "mixlib/shellout" unless defined?(Mixlib::ShellOut)
 require_relative "path_sanity"
 
 class Chef
diff --git a/lib/chef/mixin/template.rb b/lib/chef/mixin/template.rb
index bb811aa758..e230044bae 100644
--- a/lib/chef/mixin/template.rb
+++ b/lib/chef/mixin/template.rb
@@ -16,8 +16,8 @@
 # limitations under the License.
 #
 
-require "tempfile"
-require "erubis"
+require "tempfile" unless defined?(Tempfile)
+require "erubis" unless defined?(Erubis)
 
 class Chef
   module Mixin
diff --git a/lib/chef/mixin/uris.rb b/lib/chef/mixin/uris.rb
index ea55eefd8f..53624ca41d 100644
--- a/lib/chef/mixin/uris.rb
+++ b/lib/chef/mixin/uris.rb
@@ -16,8 +16,8 @@
 # limitations under the License.
 #
 
-require "uri"
-require "addressable/uri"
+require "uri" unless defined?(URI)
+require "addressable/uri" unless defined?(Addressable::URI)
 
 class Chef
   module Mixin
diff --git a/lib/chef/monkey_patches/net_http.rb b/lib/chef/monkey_patches/net_http.rb
index 775568639b..e1a65a369c 100644
--- a/lib/chef/monkey_patches/net_http.rb
+++ b/lib/chef/monkey_patches/net_http.rb
@@ -9,7 +9,7 @@ unless defined?(Net::HTTPClientException)
   Net::HTTPClientException = Net::HTTPServerException
 end
 
-require "net/http"
+require "net/http" unless defined?(Net::HTTP)
 module Net
   class HTTPError
     include ChefNetHTTPExceptionExtensions
diff --git a/lib/chef/monkey_patches/win32/registry.rb b/lib/chef/monkey_patches/win32/registry.rb
index 38dd220727..c4f369d17c 100644
--- a/lib/chef/monkey_patches/win32/registry.rb
+++ b/lib/chef/monkey_patches/win32/registry.rb
@@ -17,7 +17,7 @@
 
 require_relative "../../win32/api/registry"
 require_relative "../../win32/unicode"
-require "win32/registry"
+require "win32/registry" unless defined?(Win32::Registry)
 
 module Win32
   class Registry
diff --git a/lib/chef/monologger.rb b/lib/chef/monologger.rb
index 0bd262bd85..b9611feaf2 100644
--- a/lib/chef/monologger.rb
+++ b/lib/chef/monologger.rb
@@ -1,4 +1,4 @@
 require "mixlib/log/logger"
-require "pp"
+require "pp" unless defined?(PP)
 
 MonoLogger = Mixlib::Log::Logger
diff --git a/lib/chef/node.rb b/lib/chef/node.rb
index 448dfa9ce9..a9010d9287 100644
--- a/lib/chef/node.rb
+++ b/lib/chef/node.rb
@@ -18,8 +18,8 @@
 # limitations under the License.
 #
 
-require "forwardable"
-require "securerandom"
+require "forwardable" unless defined?(Forwardable)
+require "securerandom" unless defined?(SecureRandom)
 require_relative "config"
 require_relative "nil_argument"
 require_relative "mixin/params_validate"
diff --git a/lib/chef/platform/provider_handler_map.rb b/lib/chef/platform/provider_handler_map.rb
index 46b9d29086..c7f8e602ce 100644
--- a/lib/chef/platform/provider_handler_map.rb
+++ b/lib/chef/platform/provider_handler_map.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "singleton"
+require "singleton" unless defined?(Singleton)
 require_relative "../node_map"
 
 class Chef
diff --git a/lib/chef/platform/provider_priority_map.rb b/lib/chef/platform/provider_priority_map.rb
index c530cebe72..4507c77833 100644
--- a/lib/chef/platform/provider_priority_map.rb
+++ b/lib/chef/platform/provider_priority_map.rb
@@ -1,4 +1,4 @@
-require "singleton"
+require "singleton" unless defined?(Singleton)
 require_relative "priority_map"
 
 class Chef
diff --git a/lib/chef/platform/query_helpers.rb b/lib/chef/platform/query_helpers.rb
index a0bc162ef3..6e56eba120 100644
--- a/lib/chef/platform/query_helpers.rb
+++ b/lib/chef/platform/query_helpers.rb
@@ -26,7 +26,7 @@ class Chef
 
       def windows_nano_server?
         return false unless windows?
-        require "win32/registry"
+        require "win32/registry" unless defined?(Win32::Registry)
 
         # This method may be called before ohai runs (e.g., it may be used to
         # determine settings in config.rb). Chef::Win32::Registry.new uses
@@ -48,7 +48,7 @@ class Chef
 
       def supports_msi?
         return false unless windows?
-        require "win32/registry"
+        require "win32/registry" unless defined?(Win32::Registry)
 
         key = "System\\CurrentControlSet\\Services\\msiserver"
         access = ::Win32::Registry::KEY_QUERY_VALUE
@@ -90,7 +90,7 @@ class Chef
 
       def supported_powershell_version?(node, version_string)
         return false unless node[:languages] && node[:languages][:powershell]
-        require "rubygems"
+        require "rubygems" unless defined?(Gem)
         Gem::Version.new(node[:languages][:powershell][:version]) >=
           Gem::Version.new(version_string)
       end
diff --git a/lib/chef/platform/resource_handler_map.rb b/lib/chef/platform/resource_handler_map.rb
index 1c3ae5e2c7..2a4244dde2 100644
--- a/lib/chef/platform/resource_handler_map.rb
+++ b/lib/chef/platform/resource_handler_map.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "singleton"
+require "singleton" unless defined?(Singleton)
 require_relative "../node_map"
 
 class Chef
diff --git a/lib/chef/platform/resource_priority_map.rb b/lib/chef/platform/resource_priority_map.rb
index 692ba2c988..8995a91f45 100644
--- a/lib/chef/platform/resource_priority_map.rb
+++ b/lib/chef/platform/resource_priority_map.rb
@@ -1,4 +1,4 @@
-require "singleton"
+require "singleton" unless defined?(Singleton)
 require_relative "priority_map"
 
 class Chef
diff --git a/lib/chef/policy_builder/dynamic.rb b/lib/chef/policy_builder/dynamic.rb
index aa46360043..2b08e6466e 100644
--- a/lib/chef/policy_builder/dynamic.rb
+++ b/lib/chef/policy_builder/dynamic.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 require_relative "../log"
 require_relative "../run_context"
diff --git a/lib/chef/powershell.rb b/lib/chef/powershell.rb
index c6d8369943..3fe58b254b 100644
--- a/lib/chef/powershell.rb
+++ b/lib/chef/powershell.rb
@@ -15,7 +15,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-require "ffi"
+require "ffi" unless defined?(FFI)
 require_relative "json_compat"
 
 class Chef
diff --git a/lib/chef/provider.rb b/lib/chef/provider.rb
index fdcaa54710..a95056d70c 100644
--- a/lib/chef/provider.rb
+++ b/lib/chef/provider.rb
@@ -26,7 +26,7 @@ require_relative "mixin/provides"
 require_relative "dsl/core"
 require_relative "platform/service_helpers"
 require_relative "node_map"
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/apt_repository.rb b/lib/chef/provider/apt_repository.rb
index bba0b45038..9065a7d9dc 100644
--- a/lib/chef/provider/apt_repository.rb
+++ b/lib/chef/provider/apt_repository.rb
@@ -21,7 +21,7 @@ require_relative "../dsl/declare_resource"
 require_relative "../mixin/shell_out"
 require_relative "../http/simple"
 require_relative "noop"
-require "tmpdir"
+require "tmpdir" unless defined?(Dir.mktmpdir)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/directory.rb b/lib/chef/provider/directory.rb
index 1a2a2d2b7c..ad627757f8 100644
--- a/lib/chef/provider/directory.rb
+++ b/lib/chef/provider/directory.rb
@@ -21,7 +21,7 @@ require_relative "../log"
 require_relative "../resource/directory"
 require_relative "../provider"
 require_relative "file"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/execute.rb b/lib/chef/provider/execute.rb
index 9a70996a2e..793d620c88 100644
--- a/lib/chef/provider/execute.rb
+++ b/lib/chef/provider/execute.rb
@@ -18,7 +18,7 @@
 
 require_relative "../log"
 require_relative "../provider"
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 require_relative "../mixin/train_or_shell"
 
 class Chef
diff --git a/lib/chef/provider/file.rb b/lib/chef/provider/file.rb
index 823a73c01b..2e48501e33 100644
--- a/lib/chef/provider/file.rb
+++ b/lib/chef/provider/file.rb
@@ -21,8 +21,8 @@ require_relative "../config"
 require_relative "../log"
 require_relative "../resource/file"
 require_relative "../provider"
-require "etc"
-require "fileutils"
+require "etc" unless defined?(Etc)
+require "fileutils" unless defined?(FileUtils)
 require_relative "../scan_access_control"
 require_relative "../mixin/checksum"
 require_relative "../mixin/file_class"
diff --git a/lib/chef/provider/git.rb b/lib/chef/provider/git.rb
index 1abffe62fa..2d8cfbc877 100644
--- a/lib/chef/provider/git.rb
+++ b/lib/chef/provider/git.rb
@@ -19,7 +19,7 @@
 require_relative "../exceptions"
 require_relative "../log"
 require_relative "../provider"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 
 class Chef
   class Provider
@@ -314,7 +314,7 @@ class Chef
           # user who is executing `git` not the user running Chef.
           env["HOME"] =
             begin
-              require "etc"
+              require "etc" unless defined?(Etc)
               case new_resource.user
               when Integer
                 Etc.getpwuid(new_resource.user).dir
diff --git a/lib/chef/provider/group.rb b/lib/chef/provider/group.rb
index b3aa42ae58..ba84ea9468 100644
--- a/lib/chef/provider/group.rb
+++ b/lib/chef/provider/group.rb
@@ -18,7 +18,7 @@
 
 require_relative "../provider"
 require_relative "../mixin/shell_out"
-require "etc"
+require "etc" unless defined?(Etc)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/group/suse.rb b/lib/chef/provider/group/suse.rb
index 15360808c9..f17c1fc005 100644
--- a/lib/chef/provider/group/suse.rb
+++ b/lib/chef/provider/group/suse.rb
@@ -17,7 +17,7 @@
 #
 
 require_relative "groupadd"
-require "etc"
+require "etc" unless defined?(Etc)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/http_request.rb b/lib/chef/provider/http_request.rb
index 98f73e79c4..6859385f7b 100644
--- a/lib/chef/provider/http_request.rb
+++ b/lib/chef/provider/http_request.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "tempfile"
+require "tempfile" unless defined?(Tempfile)
 require_relative "../http/simple"
 
 class Chef
diff --git a/lib/chef/provider/launchd.rb b/lib/chef/provider/launchd.rb
index 6206f7fd7e..2530e6f779 100644
--- a/lib/chef/provider/launchd.rb
+++ b/lib/chef/provider/launchd.rb
@@ -21,7 +21,7 @@ require_relative "../resource/file"
 require_relative "../resource/cookbook_file"
 require_relative "../resource/macosx_service"
 require "plist"
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/mount/solaris.rb b/lib/chef/provider/mount/solaris.rb
index 18664246b8..69659d4918 100644
--- a/lib/chef/provider/mount/solaris.rb
+++ b/lib/chef/provider/mount/solaris.rb
@@ -20,7 +20,7 @@
 
 require_relative "../mount"
 require_relative "../../log"
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/ohai.rb b/lib/chef/provider/ohai.rb
index 0b65a1d28a..9cd67b764c 100644
--- a/lib/chef/provider/ohai.rb
+++ b/lib/chef/provider/ohai.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "ohai"
+require "ohai" unless defined?(Ohai::System)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/package.rb b/lib/chef/provider/package.rb
index 29c3a55a42..2c984b780e 100644
--- a/lib/chef/provider/package.rb
+++ b/lib/chef/provider/package.rb
@@ -22,7 +22,7 @@ require_relative "../log"
 require_relative "../file_cache"
 require_relative "../platform"
 require_relative "../decorator/lazy_array"
-require "shellwords"
+require "shellwords" unless defined?(Shellwords)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/package/dnf/python_helper.rb b/lib/chef/provider/package/dnf/python_helper.rb
index 9a5db7d0ef..881c852392 100644
--- a/lib/chef/provider/package/dnf/python_helper.rb
+++ b/lib/chef/provider/package/dnf/python_helper.rb
@@ -18,7 +18,7 @@
 require_relative "../../../mixin/which"
 require_relative "../../../mixin/shell_out"
 require_relative "version"
-require "timeout"
+require "timeout" unless defined?(Timeout)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/package/homebrew.rb b/lib/chef/provider/package/homebrew.rb
index 7fa27b9bb8..f71aaf1882 100644
--- a/lib/chef/provider/package/homebrew.rb
+++ b/lib/chef/provider/package/homebrew.rb
@@ -18,7 +18,7 @@
 # limitations under the License.
 #
 
-require "etc"
+require "etc" unless defined?(Etc)
 require_relative "../../mixin/homebrew_user"
 
 class Chef
diff --git a/lib/chef/provider/package/rubygems.rb b/lib/chef/provider/package/rubygems.rb
index 6817ac1ec9..e8b88437fb 100644
--- a/lib/chef/provider/package/rubygems.rb
+++ b/lib/chef/provider/package/rubygems.rb
@@ -17,14 +17,14 @@
 # limitations under the License.
 #
 
-require "uri"
+require "uri" unless defined?(URI)
 require_relative "../package"
 require_relative "../../resource/package"
 require_relative "../../mixin/get_source_from_package"
 require_relative "../../mixin/which"
 
 # Class methods on Gem are defined in rubygems
-require "rubygems"
+require "rubygems" unless defined?(Gem)
 # Ruby 1.9's gem_prelude can interact poorly with loading the full rubygems
 # explicitly like this. Make sure rubygems/specification is always last in this
 # list
diff --git a/lib/chef/provider/package/snap.rb b/lib/chef/provider/package/snap.rb
index b91a3b87e3..8096f54659 100644
--- a/lib/chef/provider/package/snap.rb
+++ b/lib/chef/provider/package/snap.rb
@@ -19,7 +19,7 @@
 require_relative "../package"
 require_relative "../../resource/snap_package"
 require_relative "../../mixin/shell_out"
-require "socket"
+require "socket" unless defined?(Socket)
 require "json"
 
 class Chef
diff --git a/lib/chef/provider/package/yum/python_helper.rb b/lib/chef/provider/package/yum/python_helper.rb
index 4641980be7..ee7f64d1ea 100644
--- a/lib/chef/provider/package/yum/python_helper.rb
+++ b/lib/chef/provider/package/yum/python_helper.rb
@@ -18,8 +18,8 @@
 require_relative "../../../mixin/which"
 require_relative "../../../mixin/shell_out"
 require_relative "version"
-require "singleton"
-require "timeout"
+require "singleton" unless defined?(Singleton)
+require "timeout" unless defined?(Timeout)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/package/yum/yum_cache.rb b/lib/chef/provider/package/yum/yum_cache.rb
index 0615a9bf85..ce46a0fcfd 100644
--- a/lib/chef/provider/package/yum/yum_cache.rb
+++ b/lib/chef/provider/package/yum/yum_cache.rb
@@ -18,7 +18,7 @@
 
 require_relative "python_helper"
 require_relative "../../package"
-require "singleton"
+require "singleton" unless defined?(Singleton)
 
 #
 # These are largely historical APIs, the YumCache object no longer exists and this is a
diff --git a/lib/chef/provider/registry_key.rb b/lib/chef/provider/registry_key.rb
index 3e3faef40e..11d9f3f9b3 100644
--- a/lib/chef/provider/registry_key.rb
+++ b/lib/chef/provider/registry_key.rb
@@ -22,8 +22,8 @@ require_relative "../log"
 require_relative "../resource/file"
 require_relative "../mixin/checksum"
 require_relative "../provider"
-require "etc"
-require "fileutils"
+require "etc" unless defined?(Etc)
+require "fileutils" unless defined?(FileUtils)
 require_relative "../scan_access_control"
 require_relative "../win32/registry"
 
diff --git a/lib/chef/provider/remote_directory.rb b/lib/chef/provider/remote_directory.rb
index 13088b3706..933ebe119d 100644
--- a/lib/chef/provider/remote_directory.rb
+++ b/lib/chef/provider/remote_directory.rb
@@ -24,7 +24,7 @@ require_relative "../mixin/file_class"
 require_relative "../platform/query_helpers"
 require_relative "../util/path_helper"
 
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/remote_file/cache_control_data.rb b/lib/chef/provider/remote_file/cache_control_data.rb
index 974b229a45..5742ac8ce6 100644
--- a/lib/chef/provider/remote_file/cache_control_data.rb
+++ b/lib/chef/provider/remote_file/cache_control_data.rb
@@ -19,7 +19,7 @@
 # limitations under the License.
 #
 
-require "stringio"
+require "stringio" unless defined?(StringIO)
 require_relative "../../file_cache"
 require_relative "../../json_compat"
 require_relative "../../digester"
diff --git a/lib/chef/provider/remote_file/content.rb b/lib/chef/provider/remote_file/content.rb
index 3e1af01f22..8fe52288c0 100644
--- a/lib/chef/provider/remote_file/content.rb
+++ b/lib/chef/provider/remote_file/content.rb
@@ -17,8 +17,8 @@
 # limitations under the License.
 #
 
-require "uri"
-require "tempfile"
+require "uri" unless defined?(URI)
+require "tempfile" unless defined?(Tempfile)
 require_relative "../../file_content_management/content_base"
 require_relative "../../mixin/uris"
 
diff --git a/lib/chef/provider/remote_file/ftp.rb b/lib/chef/provider/remote_file/ftp.rb
index b6399ee077..eafebc9693 100644
--- a/lib/chef/provider/remote_file/ftp.rb
+++ b/lib/chef/provider/remote_file/ftp.rb
@@ -16,8 +16,8 @@
 # limitations under the License.
 #
 
-require "uri"
-require "tempfile"
+require "uri" unless defined?(URI)
+require "tempfile" unless defined?(Tempfile)
 require "net/ftp"
 require_relative "../remote_file"
 require_relative "../../file_content_management/tempfile"
diff --git a/lib/chef/provider/remote_file/local_file.rb b/lib/chef/provider/remote_file/local_file.rb
index eb1b88e1fa..14877806ce 100644
--- a/lib/chef/provider/remote_file/local_file.rb
+++ b/lib/chef/provider/remote_file/local_file.rb
@@ -16,8 +16,8 @@
 # limitations under the License.
 #
 
-require "uri"
-require "tempfile"
+require "uri" unless defined?(URI)
+require "tempfile" unless defined?(Tempfile)
 require_relative "../remote_file"
 
 class Chef
diff --git a/lib/chef/provider/remote_file/network_file.rb b/lib/chef/provider/remote_file/network_file.rb
index 11d8dd2ff5..b08aeb55cc 100644
--- a/lib/chef/provider/remote_file/network_file.rb
+++ b/lib/chef/provider/remote_file/network_file.rb
@@ -16,8 +16,8 @@
 # limitations under the License.
 #
 
-require "uri"
-require "tempfile"
+require "uri" unless defined?(URI)
+require "tempfile" unless defined?(Tempfile)
 require_relative "../remote_file"
 require_relative "../../mixin/user_context"
 
diff --git a/lib/chef/provider/remote_file/sftp.rb b/lib/chef/provider/remote_file/sftp.rb
index f112b3782c..3da49ebedd 100644
--- a/lib/chef/provider/remote_file/sftp.rb
+++ b/lib/chef/provider/remote_file/sftp.rb
@@ -16,8 +16,8 @@
 # limitations under the License.
 #
 
-require "uri"
-require "tempfile"
+require "uri" unless defined?(URI)
+require "tempfile" unless defined?(Tempfile)
 require "net/sftp"
 require_relative "../remote_file"
 require_relative "../../file_content_management/tempfile"
diff --git a/lib/chef/provider/script.rb b/lib/chef/provider/script.rb
index 8d33c56da2..4282825650 100644
--- a/lib/chef/provider/script.rb
+++ b/lib/chef/provider/script.rb
@@ -16,10 +16,10 @@
 # limitations under the License.
 #
 
-require "tempfile"
+require "tempfile" unless defined?(Tempfile)
 require_relative "execute"
 require_relative "../win32/security" if Chef::Platform.windows?
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/service/macosx.rb b/lib/chef/provider/service/macosx.rb
index 0e8a29ce32..746581df73 100644
--- a/lib/chef/provider/service/macosx.rb
+++ b/lib/chef/provider/service/macosx.rb
@@ -16,8 +16,8 @@
 # limitations under the License.
 #
 
-require "etc"
-require "rexml/document"
+require "etc" unless defined?(Etc)
+require "rexml/document" unless defined?(REXML::Document)
 require_relative "../../resource/service"
 require_relative "../../resource/macosx_service"
 require_relative "simple"
diff --git a/lib/chef/provider/service/systemd.rb b/lib/chef/provider/service/systemd.rb
index e15eab23bd..4cb564e8c0 100644
--- a/lib/chef/provider/service/systemd.rb
+++ b/lib/chef/provider/service/systemd.rb
@@ -20,7 +20,7 @@
 require_relative "../../resource/service"
 require_relative "simple"
 require_relative "../../mixin/which"
-require "shellwords"
+require "shellwords" unless defined?(Shellwords)
 
 class Chef::Provider::Service::Systemd < Chef::Provider::Service::Simple
 
diff --git a/lib/chef/provider/subversion.rb b/lib/chef/provider/subversion.rb
index 10be5fd7c4..580c879c97 100644
--- a/lib/chef/provider/subversion.rb
+++ b/lib/chef/provider/subversion.rb
@@ -21,7 +21,7 @@
 require_relative "../log"
 require_relative "../provider"
 require "chef-config/mixin/fuzzy_hostname_matcher"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/systemd_unit.rb b/lib/chef/provider/systemd_unit.rb
index c24c088935..81a56d959a 100644
--- a/lib/chef/provider/systemd_unit.rb
+++ b/lib/chef/provider/systemd_unit.rb
@@ -22,7 +22,7 @@ require_relative "../mixin/shell_out"
 require_relative "../resource/file"
 require_relative "../resource/file/verification/systemd_unit"
 require "iniparse"
-require "shellwords"
+require "shellwords" unless defined?(Shellwords)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/user.rb b/lib/chef/provider/user.rb
index 0cd6b9a1c1..f4046a8bbf 100644
--- a/lib/chef/provider/user.rb
+++ b/lib/chef/provider/user.rb
@@ -17,7 +17,7 @@
 #
 
 require_relative "../provider"
-require "etc"
+require "etc" unless defined?(Etc)
 
 class Chef
   class Provider
diff --git a/lib/chef/provider/user/dscl.rb b/lib/chef/provider/user/dscl.rb
index 70379c177e..f5da8e695b 100644
--- a/lib/chef/provider/user/dscl.rb
+++ b/lib/chef/provider/user/dscl.rb
@@ -19,7 +19,7 @@
 require_relative "../../mixin/shell_out"
 require_relative "../user"
 require_relative "../../resource/user/dscl_user"
-require "openssl"
+require "openssl" unless defined?(OpenSSL)
 require "plist"
 require_relative "../../util/path_helper"
 
diff --git a/lib/chef/provider/windows_task.rb b/lib/chef/provider/windows_task.rb
index dadfd45580..83347b764a 100644
--- a/lib/chef/provider/windows_task.rb
+++ b/lib/chef/provider/windows_task.rb
@@ -17,7 +17,7 @@
 #
 
 require_relative "../mixin/shell_out"
-require "rexml/document"
+require "rexml/document" unless defined?(REXML::Document)
 require "iso8601" if Chef::Platform.windows?
 require_relative "../mixin/powershell_out"
 require_relative "../provider"
diff --git a/lib/chef/provider/zypper_repository.rb b/lib/chef/provider/zypper_repository.rb
index 49c880a8d0..8c1497b5f5 100644
--- a/lib/chef/provider/zypper_repository.rb
+++ b/lib/chef/provider/zypper_repository.rb
@@ -20,7 +20,7 @@ require_relative "../resource"
 require_relative "../dsl/declare_resource"
 require_relative "noop"
 require_relative "../mixin/shell_out"
-require "shellwords"
+require "shellwords" unless defined?(Shellwords)
 
 class Chef
   class Provider
diff --git a/lib/chef/request_id.rb b/lib/chef/request_id.rb
index 33e54d9edc..3f258b7fcd 100644
--- a/lib/chef/request_id.rb
+++ b/lib/chef/request_id.rb
@@ -15,8 +15,8 @@
 # limitations under the License.
 #
 
-require "securerandom"
-require "singleton"
+require "securerandom" unless defined?(SecureRandom)
+require "singleton" unless defined?(Singleton)
 
 class Chef
   class RequestID
diff --git a/lib/chef/resource.rb b/lib/chef/resource.rb
index 41fda3e665..40dcbd1ed2 100644
--- a/lib/chef/resource.rb
+++ b/lib/chef/resource.rb
@@ -38,7 +38,7 @@ require_relative "resource/resource_notification"
 require_relative "provider_resolver"
 require_relative "resource_resolver"
 require_relative "provider"
-require "set"
+require "set" unless defined?(Set)
 
 require_relative "mixin/deprecation"
 require_relative "mixin/properties"
diff --git a/lib/chef/resource/archive_file.rb b/lib/chef/resource/archive_file.rb
index 156c0c9775..18a6a2d5a0 100644
--- a/lib/chef/resource/archive_file.rb
+++ b/lib/chef/resource/archive_file.rb
@@ -62,7 +62,7 @@ class Chef
       alias_method :extract_options, :options
       alias_method :extract_to, :destination
 
-      require "fileutils"
+      require "fileutils" unless defined?(FileUtils)
 
       action :extract do
         description "Extract and archive file."
diff --git a/lib/chef/resource/chocolatey_config.rb b/lib/chef/resource/chocolatey_config.rb
index d742c6e37a..247fa5bf23 100644
--- a/lib/chef/resource/chocolatey_config.rb
+++ b/lib/chef/resource/chocolatey_config.rb
@@ -39,7 +39,7 @@ class Chef
       # @param [String] id the config name
       # @return [String] the element's value field
       def fetch_config_element(id)
-        require "rexml/document"
+        require "rexml/document" unless defined?(REXML::Document)
         config_file = "#{ENV['ALLUSERSPROFILE']}\\chocolatey\\config\\chocolatey.config"
         raise "Could not find the Chocolatey config at #{config_file}!" unless ::File.exist?(config_file)
 
diff --git a/lib/chef/resource/chocolatey_source.rb b/lib/chef/resource/chocolatey_source.rb
index ce0287a67c..e8ef95aad5 100644
--- a/lib/chef/resource/chocolatey_source.rb
+++ b/lib/chef/resource/chocolatey_source.rb
@@ -47,7 +47,7 @@ class Chef
       # @param [String] id the source name
       # @return [REXML::Attributes] finds the source element with the
       def fetch_source_element(id)
-        require "rexml/document"
+        require "rexml/document" unless defined?(REXML::Document)
 
         config_file = "#{ENV['ALLUSERSPROFILE']}\\chocolatey\\config\\chocolatey.config"
         raise "Could not find the Chocolatey config at #{config_file}!" unless ::File.exist?(config_file)
diff --git a/lib/chef/resource/cron_d.rb b/lib/chef/resource/cron_d.rb
index b4cb5bd831..fe3ef4914c 100644
--- a/lib/chef/resource/cron_d.rb
+++ b/lib/chef/resource/cron_d.rb
@@ -16,7 +16,7 @@
 #
 
 require_relative "../resource"
-require "shellwords"
+require "shellwords" unless defined?(Shellwords)
 
 class Chef
   class Resource
diff --git a/lib/chef/resource/file.rb b/lib/chef/resource/file.rb
index 3761a1d51a..c034774257 100644
--- a/lib/chef/resource/file.rb
+++ b/lib/chef/resource/file.rb
@@ -21,7 +21,7 @@ require_relative "../resource"
 require_relative "../platform/query_helpers"
 require_relative "../mixin/securable"
 require_relative "file/verification"
-require "pathname"
+require "pathname" unless defined?(Pathname)
 require_relative "../dist"
 
 class Chef
diff --git a/lib/chef/resource/hostname.rb b/lib/chef/resource/hostname.rb
index 87d7328ad3..ac4e1c98c0 100644
--- a/lib/chef/resource/hostname.rb
+++ b/lib/chef/resource/hostname.rb
@@ -65,7 +65,7 @@ class Chef
         # @return [String]
         def updated_ec2_config_xml
           begin
-            require "rexml/document"
+            require "rexml/document" unless defined?(REXML::Document)
             config_file = 'C:\Program Files\Amazon\Ec2ConfigService\Settings\config.xml'
             config = REXML::Document.new(::File.read(config_file))
             # find an element named State with a sibling element whose value is Ec2SetComputerName
diff --git a/lib/chef/resource/remote_file.rb b/lib/chef/resource/remote_file.rb
index b6566aa619..f3c45b0183 100644
--- a/lib/chef/resource/remote_file.rb
+++ b/lib/chef/resource/remote_file.rb
@@ -17,7 +17,7 @@
 # limitations under the License.
 #
 
-require "uri"
+require "uri" unless defined?(URI)
 require_relative "file"
 require_relative "../provider/remote_file"
 require_relative "../mixin/securable"
diff --git a/lib/chef/resource/rhsm_register.rb b/lib/chef/resource/rhsm_register.rb
index e15862dd45..cca3d57f05 100644
--- a/lib/chef/resource/rhsm_register.rb
+++ b/lib/chef/resource/rhsm_register.rb
@@ -16,7 +16,7 @@
 #
 
 require_relative "../resource"
-require "shellwords"
+require "shellwords" unless defined?(Shellwords)
 
 class Chef
   class Resource
diff --git a/lib/chef/resource/service.rb b/lib/chef/resource/service.rb
index 50b8aa8845..e13f237481 100644
--- a/lib/chef/resource/service.rb
+++ b/lib/chef/resource/service.rb
@@ -18,7 +18,7 @@
 #
 
 require_relative "../resource"
-require "shellwords"
+require "shellwords" unless defined?(Shellwords)
 require_relative "../dist"
 
 class Chef
diff --git a/lib/chef/resource/windows_certificate.rb b/lib/chef/resource/windows_certificate.rb
index be1853746d..456543a4a6 100644
--- a/lib/chef/resource/windows_certificate.rb
+++ b/lib/chef/resource/windows_certificate.rb
@@ -20,7 +20,7 @@
 require_relative "../util/path_helper"
 require_relative "../resource"
 require "win32-certstore" if Chef::Platform.windows?
-require "openssl"
+require "openssl" unless defined?(OpenSSL)
 require_relative "../dist"
 
 class Chef
diff --git a/lib/chef/resource/windows_font.rb b/lib/chef/resource/windows_font.rb
index 0105ad469c..333769c3cd 100644
--- a/lib/chef/resource/windows_font.rb
+++ b/lib/chef/resource/windows_font.rb
@@ -108,7 +108,7 @@ class Chef
         # @return [String] path to the font
         def source_uri
           begin
-            require "uri"
+            require "uri" unless defined?(URI)
             if remote_file_schema?(URI.parse(new_resource.source).scheme)
               logger.trace("source property starts with ftp/http. Using source property unmodified")
               return new_resource.source
diff --git a/lib/chef/resource_collection.rb b/lib/chef/resource_collection.rb
index a1f97a7d12..c2bb463bfb 100644
--- a/lib/chef/resource_collection.rb
+++ b/lib/chef/resource_collection.rb
@@ -21,7 +21,7 @@ require_relative "resource_collection/resource_set"
 require_relative "resource_collection/resource_list"
 require_relative "resource_collection/resource_collection_serialization"
 require_relative "log"
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 ##
 # ResourceCollection currently handles two tasks:
diff --git a/lib/chef/resource_collection/resource_list.rb b/lib/chef/resource_collection/resource_list.rb
index 861bc302c5..9e2b798e93 100644
--- a/lib/chef/resource_collection/resource_list.rb
+++ b/lib/chef/resource_collection/resource_list.rb
@@ -19,7 +19,7 @@
 require_relative "../resource"
 require_relative "stepable_iterator"
 require_relative "resource_collection_serialization"
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 # This class keeps the list of all known Resources in the order they are to be executed in.  It also keeps a pointer
 # to the most recently executed resource so we can add resources-to-execute after this point.
diff --git a/lib/chef/resource_reporter.rb b/lib/chef/resource_reporter.rb
index 8375a3623a..e63459388d 100644
--- a/lib/chef/resource_reporter.rb
+++ b/lib/chef/resource_reporter.rb
@@ -19,8 +19,8 @@
 # limitations under the License.
 #
 
-require "uri"
-require "securerandom"
+require "uri" unless defined?(URI)
+require "securerandom" unless defined?(SecureRandom)
 require_relative "event_dispatch/base"
 
 class Chef
diff --git a/lib/chef/run_context.rb b/lib/chef/run_context.rb
index e533ebbddd..7c19a33383 100644
--- a/lib/chef/run_context.rb
+++ b/lib/chef/run_context.rb
@@ -26,7 +26,7 @@ require_relative "recipe"
 require_relative "run_context/cookbook_compiler"
 require_relative "event_dispatch/events_output_stream"
 require_relative "train_transport"
-require "forwardable"
+require "forwardable" unless defined?(Forwardable)
 
 class Chef
 
diff --git a/lib/chef/run_context/cookbook_compiler.rb b/lib/chef/run_context/cookbook_compiler.rb
index 4c6e1c9f0d..0ea66dcf52 100644
--- a/lib/chef/run_context/cookbook_compiler.rb
+++ b/lib/chef/run_context/cookbook_compiler.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "set"
+require "set" unless defined?(Set)
 require_relative "../log"
 require_relative "../recipe"
 require_relative "../resource/lwrp_base"
diff --git a/lib/chef/run_lock.rb b/lib/chef/run_lock.rb
index 1e779a9bdb..5f9b1ae06f 100644
--- a/lib/chef/run_lock.rb
+++ b/lib/chef/run_lock.rb
@@ -22,7 +22,7 @@ if Chef::Platform.windows?
 end
 require_relative "config"
 require_relative "exceptions"
-require "timeout"
+require "timeout" unless defined?(Timeout)
 require_relative "dist"
 
 class Chef
diff --git a/lib/chef/search/query.rb b/lib/chef/search/query.rb
index 38a9f9406e..46e5c15b8f 100644
--- a/lib/chef/search/query.rb
+++ b/lib/chef/search/query.rb
@@ -20,8 +20,8 @@ require_relative "../config"
 require_relative "../exceptions"
 require_relative "../server_api"
 
-require "uri"
-require "addressable/uri"
+require "uri" unless defined?(URI)
+require "addressable/uri" unless defined?(Addressable::URI)
 
 class Chef
   class Search
diff --git a/lib/chef/server_api_versions.rb b/lib/chef/server_api_versions.rb
index 40fb6385e1..755bd9be30 100644
--- a/lib/chef/server_api_versions.rb
+++ b/lib/chef/server_api_versions.rb
@@ -15,7 +15,7 @@
 # limitations under the License.
 #
 
-require "singleton"
+require "singleton" unless defined?(Singleton)
 
 class Chef
   class ServerAPIVersions
diff --git a/lib/chef/shell.rb b/lib/chef/shell.rb
index 901a13cd0f..831b3438ef 100644
--- a/lib/chef/shell.rb
+++ b/lib/chef/shell.rb
@@ -15,10 +15,10 @@
 # limitations under the License.
 #
 
-require "singleton"
-require "pp"
-require "etc"
-require "mixlib/cli"
+require "singleton" unless defined?(Singleton)
+require "pp" unless defined?(PP)
+require "etc" unless defined?(Etc)
+require "mixlib/cli" unless defined?(Mixlib::CLI)
 
 require_relative "../chef"
 require_relative "version"
diff --git a/lib/chef/shell/ext.rb b/lib/chef/shell/ext.rb
index b75be3e339..7bd3ec31d1 100644
--- a/lib/chef/shell/ext.rb
+++ b/lib/chef/shell/ext.rb
@@ -16,9 +16,9 @@
 # limitations under the License.
 #
 
-require "tempfile"
+require "tempfile" unless defined?(Tempfile)
 require_relative "../recipe"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 require_relative "../dsl/platform_introspection"
 require_relative "../version"
 require_relative "shell_session"
diff --git a/lib/chef/util/file_edit.rb b/lib/chef/util/file_edit.rb
index 87496d56db..5ea3c17129 100644
--- a/lib/chef/util/file_edit.rb
+++ b/lib/chef/util/file_edit.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 
 require_relative "editor"
-require "fileutils"
+require "fileutils" unless defined?(FileUtils)
 
 class Chef
   class Util
diff --git a/lib/chef/util/powershell/cmdlet.rb b/lib/chef/util/powershell/cmdlet.rb
index d128b1cdc1..ab0516b20e 100644
--- a/lib/chef/util/powershell/cmdlet.rb
+++ b/lib/chef/util/powershell/cmdlet.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "mixlib/shellout"
+require "mixlib/shellout" unless defined?(Mixlib::ShellOut)
 require_relative "../../mixin/windows_architecture_helper"
 require_relative "cmdlet_result"
 
diff --git a/lib/chef/win32/api.rb b/lib/chef/win32/api.rb
index 6bfa287249..e32828673a 100644
--- a/lib/chef/win32/api.rb
+++ b/lib/chef/win32/api.rb
@@ -17,7 +17,7 @@
 # limitations under the License.
 #
 
-require "ffi"
+require "ffi" unless defined?(FFI)
 require_relative "../reserved_names"
 require_relative "../exceptions"
 
diff --git a/lib/chef/win32/api/installer.rb b/lib/chef/win32/api/installer.rb
index 2ad23be960..118afe8c8f 100644
--- a/lib/chef/win32/api/installer.rb
+++ b/lib/chef/win32/api/installer.rb
@@ -19,7 +19,7 @@
 require_relative "../../exceptions"
 require_relative "../api"
 require_relative "../error"
-require "pathname"
+require "pathname" unless defined?(Pathname)
 
 class Chef
   module ReservedNames::Win32
diff --git a/lib/chef/win32/process.rb b/lib/chef/win32/process.rb
index 85f3faea64..d2267cc76d 100644
--- a/lib/chef/win32/process.rb
+++ b/lib/chef/win32/process.rb
@@ -20,7 +20,7 @@ require_relative "api/process"
 require_relative "api/psapi"
 require_relative "error"
 require_relative "handle"
-require "ffi"
+require "ffi" unless defined?(FFI)
 
 class Chef
   module ReservedNames::Win32
diff --git a/lib/chef/win32/registry.rb b/lib/chef/win32/registry.rb
index b1a2258975..c0efa68464 100644
--- a/lib/chef/win32/registry.rb
+++ b/lib/chef/win32/registry.rb
@@ -23,7 +23,7 @@ require_relative "../mixin/wide_string"
 if RUBY_PLATFORM =~ /mswin|mingw32|windows/
   require_relative "../monkey_patches/win32/registry"
   require_relative "api/registry"
-  require "win32/registry"
+  require "win32/registry" unless defined?(Win32::Registry)
   require "win32/api"
 end
 
diff --git a/lib/chef/win32/security/ace.rb b/lib/chef/win32/security/ace.rb
index c890cc90e5..6e8c1ec418 100644
--- a/lib/chef/win32/security/ace.rb
+++ b/lib/chef/win32/security/ace.rb
@@ -20,7 +20,7 @@ require_relative "../security"
 require_relative "sid"
 require_relative "../memory"
 
-require "ffi"
+require "ffi" unless defined?(FFI)
 
 class Chef
   module ReservedNames::Win32
diff --git a/lib/chef/win32/security/acl.rb b/lib/chef/win32/security/acl.rb
index a8c1c59051..a2700b36ac 100644
--- a/lib/chef/win32/security/acl.rb
+++ b/lib/chef/win32/security/acl.rb
@@ -18,7 +18,7 @@
 
 require_relative "../security"
 require_relative "ace"
-require "ffi"
+require "ffi" unless defined?(FFI)
 
 class Chef
   module ReservedNames::Win32
diff --git a/lib/chef/win32/security/token.rb b/lib/chef/win32/security/token.rb
index 9a1ac51def..dfd1e31241 100644
--- a/lib/chef/win32/security/token.rb
+++ b/lib/chef/win32/security/token.rb
@@ -19,7 +19,7 @@
 require_relative "../security"
 require_relative "../api/security"
 require_relative "../unicode"
-require "ffi"
+require "ffi" unless defined?(FFI)
 
 class Chef
   module ReservedNames::Win32
diff --git a/lib/chef/win32/system.rb b/lib/chef/win32/system.rb
index 63616fa397..db641670b2 100644
--- a/lib/chef/win32/system.rb
+++ b/lib/chef/win32/system.rb
@@ -18,7 +18,7 @@
 
 require_relative "api/system"
 require_relative "error"
-require "ffi"
+require "ffi" unless defined?(FFI)
 
 class Chef
   module ReservedNames::Win32