Print current version when the repo/lockfile requires a higher version

Closes https://github.com/CocoaPods/CocoaPods/issues/2049

CHANGELOG.md

@@ -16,6 +16,10 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
   [Kyle Fuller](https://github.com/kylef)
   [#2025](https://github.com/CocoaPods/CocoaPods/issues/2025)
   
+* Print current version when the repo/lockfile requires a higher version
+  [Samuel E. Giddins](https://github.com/segiddins)
+  [#2049](https://github.com/CocoaPods/CocoaPods/issues/2049)
+
 ##### Bug Fixes
 
 * Fixed support for file references in the workspace generated by CocoaPods.  

lib/cocoapods/installer.rb

@@ -164,9 +164,10 @@ module Pod
     #
     def analyze
       if lockfile && lockfile.cocoapods_version > Version.new(VERSION)
-        STDERR.puts '[!] The version of CocoaPods used to generate the lockfile is '\
-          'higher than the version of the current executable. Incompatibility ' \
-          'issues may arise.'.yellow
+        STDERR.puts '[!] The version of CocoaPods used to generate ' \
+          "the lockfile (#{lockfile.cocoapods_version}) is "\
+          "higher than the version of the current executable (#{VERSION}). " \
+          'Incompatibility issues may arise.'.yellow
       end
 
       analyzer = Analyzer.new(sandbox, podfile, lockfile)

lib/cocoapods/sources_manager.rb

@@ -206,7 +206,7 @@ module Pod
           min, max = versions['min'], versions['max']
           version_msg = ( min == max ) ? min : "#{min} - #{max}"
           raise Informative, "The `#{dir.basename}` repo requires " \
-          "CocoaPods #{version_msg}\n".red +
+          "CocoaPods #{version_msg} (currently using #{Pod::VERSION})\n".red +
           "Update CocoaPods, or checkout the appropriate tag in the repo."
         end
 

spec/unit/sources_manager_spec.rb

@@ -153,9 +153,11 @@ module Pod
         SourcesManager.stubs(:version_information).returns({ 'min' => '999.0' })
         e = lambda { SourcesManager.check_version_information(temporary_directory) }.should.raise Informative
         e.message.should.match /Update CocoaPods/
+        e.message.should.match /(currently using #{Pod::VERSION})/
         SourcesManager.stubs(:version_information).returns({ 'max' => '0.0.1' })
         e = lambda { SourcesManager.check_version_information(temporary_directory) }.should.raise Informative
         e.message.should.match /Update CocoaPods/
+        e.message.should.match /(currently using #{Pod::VERSION})/
       end
 
       it 'raises when reading version information with merge conflict' do