[Migrator] Migrate local Ruby podspecs to JSON, allowing updating those pods to work.

Closes https://github.com/CocoaPods/CocoaPods/issues/3038.

CHANGELOG.md

@@ -28,6 +28,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Hugo Tunius](https://github.com/K0nserv)
   [#2579](https://github.com/CocoaPods/CocoaPods/issues/2579)
 
+* Migrate local Ruby podspecs to JSON, allowing updating those pods to work.  
+  [Samuel Giddins](https://github.com/segiddins)
+  [#3038](https://github.com/CocoaPods/CocoaPods/issues/3038)
+
 
 ## 0.36.0.beta.1
 

lib/cocoapods/installer/migrator.rb

@@ -52,6 +52,15 @@ module Pod
         def migrate_to_0_36(sandbox)
           UI.message('Migrating to CocoaPods 0.36') do
             move(sandbox.root + 'Headers/Build', sandbox.root + 'Headers/Private')
+
+            sandbox.specifications_root.children.each do |child|
+              unless child.ext_name.end_with?('json')
+                spec = Specification.from_file(child)
+                child.delete
+                new_path = child.to_path.gsub(/.json$/, '')
+                Pathname(new_path).write(spec.to_pretty_json)
+              end
+            end
           end
         end