Do not require aws-sdk-core in Rakefile, require only in tasks

Rakefile

@@ -11,9 +11,9 @@ $:.unshift("#{$GEMS_DIR}/aws-partitions/lib")
 $:.unshift("#{$GEMS_DIR}/aws-eventstream/lib")
 $:.unshift("#{$GEMS_DIR}/aws-sigv4/lib")
 
-require 'build_tools'
-require 'aws-sdk-code-generator'
-require 'aws-sdk-core'
+task 'require-build-tools' do
+  require 'build_tools'
+end
 
 Dir.glob("#{$REPO_ROOT}/tasks/**/*.rake").each do |task_file|
   load(task_file)

build_tools/aws-sdk-code-generator/lib/aws-sdk-code-generator.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'aws-sdk-core'
+
 require_relative 'aws-sdk-code-generator/api'
 require_relative 'aws-sdk-code-generator/apply_docs'
 require_relative 'aws-sdk-code-generator/codegenerated_plugin'

tasks/build.rake

@@ -12,7 +12,7 @@ end
 desc 'Generates the code for one service, e.g. `rake build  build:aws-sdk-dynamodb`'
 task 'build:aws-sdk-*'
 
-rule /^build:aws-sdk-\w+$/ do |task|
+rule /^build:aws-sdk-\w+$/ => 'require-build-tools' do |task|
   identifier = task.name.split('-').last
   service = BuildTools::Services[identifier]
   files = AwsSdkCodeGenerator::GemBuilder.new(
@@ -27,7 +27,7 @@ end
 # Aws::STS is generated directly into the `aws-sdk-core` gem.
 # It is need to provide session credentials and assume role support.
 # Only building source, but not gemspecs, version file, etc.
-task 'build:aws-sdk-sts' do
+task 'build:aws-sdk-sts' => 'require-build-tools' do
   sts = BuildTools::Services.service('sts')
   generator = AwsSdkCodeGenerator::CodeBuilder.new(
     aws_sdk_core_lib_path: $CORE_LIB,
@@ -47,7 +47,7 @@ end
 # Aws::SSO is generated directly into the `aws-sdk-core` gem.
 # It is need to provide SSO Credentials.
 # Only building source, but not gemspecs, version file, etc.
-task 'build:aws-sdk-sso' do
+task 'build:aws-sdk-sso' => 'require-build-tools' do
   sso = BuildTools::Services.service('sso')
   generator = AwsSdkCodeGenerator::CodeBuilder.new(
     aws_sdk_core_lib_path: $CORE_LIB,
@@ -65,7 +65,7 @@ end
 
 # Aws::SSOOIDC is generated directly into the `aws-sdk-core` gem.
 # Only building source, but not gemspecs, version file, etc.
-task 'build:aws-sdk-ssooidc' do
+task 'build:aws-sdk-ssooidc' => 'require-build-tools' do
   ssooidc = BuildTools::Services.service('ssooidc')
   generator = AwsSdkCodeGenerator::CodeBuilder.new(
     aws_sdk_core_lib_path: $CORE_LIB,

tasks/update-aws-sdk-dependencies.rake

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # updates list of service gems dependend on by the aws-sdk gem
-task 'update-aws-sdk-dependencies' do
+task 'update-aws-sdk-dependencies' => 'require-build-tools' do
 
   # update the aws-sdk-resources.gemspec
   BuildTools.replace_lines(

tasks/update-defaults-mode.rake

@@ -2,6 +2,7 @@
 
 # updates the defaults mode configuration
 task 'update-defaults-mode', [:defaults_file] do |t, args|
+  Rake::Task['require-build-tools'].invoke
 
   defaults_file = args[:defaults_file]
   if defaults_file.nil? || defaults_file.empty?

tasks/update-partition-service-list.rake

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # updates the services in the aws-partitions gem
-task 'update-partition-service-list' do
+task 'update-partition-service-list' => 'require-build-tools' do
   lines = []
   lines << "          {\n"
   BuildTools::Services.sort_by(&:name).each do |svc|

tasks/update-readme.rake

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # updates the table of supported services in the repo README
-task 'update-readme' do
+task 'update-readme' => 'require-build-tools' do
 
   # insert one row for each supported service
   table = []