Upgrade notice for V2 to V3 (#2226)

Author: mullermp

CHANGELOG.md

@@ -1,6 +1,8 @@
 Unreleased Changes
 ------------------
 
+* Feature - Add upgrade notice on first client initialization and gem install.
+
 2.11.444 (2020-02-13)
 ------------------
 

aws-sdk-core/aws-sdk-core.gemspec

@@ -24,4 +24,5 @@ Gem::Specification.new do |spec|
   spec.add_dependency('jmespath', '~> 1.0')
   spec.add_dependency('aws-sigv4', '~> 1.0')
 
+  spec.post_install_message = 'NEWER VERSION AVAILABLE: Please upgrade to AWS SDK For Ruby V3'
 end

aws-sdk-core/lib/aws-sdk-core/client.rb

@@ -54,9 +54,19 @@ def define(svc_name, options)
 
         Api::Customizations.apply_plugins(client_class)
 
+        soft_deprecation
         client_class
       end
 
+      private
+
+      def soft_deprecation
+        unless @warned
+          @warned = true
+          warn("NEWER VERSION AVAILABLE: Please upgrade to AWS SDK For Ruby V3")
+        end
+      end
+
     end
   end
 end

aws-sdk-resources/aws-sdk-resources.gemspec

@@ -17,4 +17,5 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency('aws-sdk-core', version)
 
+  spec.post_install_message = 'NEWER VERSION AVAILABLE: Please upgrade to AWS SDK For Ruby V3'
 end

aws-sdk/aws-sdk.gemspec

@@ -17,4 +17,5 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency('aws-sdk-resources', version)
 
+  spec.post_install_message = 'NEWER VERSION AVAILABLE: Please upgrade to AWS SDK For Ruby V3'
 end