[Analyzer] Only update git sourced spec repos

CHANGELOG.md

@@ -47,6 +47,9 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Hugo Tunius](https://github.com/K0nserv)
   [#2823](https://github.com/CocoaPods/CocoaPods/issues/2823)
 
+* When updating spec repositories only update the git sourced repos.  
+  [Dustin Clark](https://github.com/clarkda)
+  [#2558](https://github.com/CocoaPods/CocoaPods/issues/2558)
 
 ## 0.36.0.beta.1
 

lib/cocoapods/installer/analyzer.rb

@@ -163,12 +163,12 @@ module Pod
         end
       end
 
-      # Updates the source repositories unless the config indicates to skip it.
+      # Updates the git source repositories unless the config indicates to skip it.
       #
       def update_repositories_if_needed
         unless config.skip_repo_update?
           UI.section 'Updating spec repositories' do
-            sources.each { |source| SourcesManager.update(source.name) }
+            sources.each { |source| SourcesManager.update(source.name) if SourcesManager.git_repo?(source.repo) }
           end
         end
       end

spec/unit/installer/analyzer_spec.rb

@@ -71,6 +71,27 @@ module Pod
         @analyzer.analyze
       end
 
+      it 'does not update non-git repositories' do
+        tmp_directory = '/private/tmp/CocoaPods/'
+        FileUtils.mkdir_p(tmp_directory)
+        FileUtils.cp_r(ROOT + 'spec/fixtures/spec-repos/test_repo/', tmp_directory)
+        non_git_repo = tmp_directory + 'test_repo'
+
+        podfile = Podfile.new do
+          platform :ios, '8.0'
+          xcodeproj 'SampleProject/SampleProject'
+          pod 'BananaLib', '1.0'
+        end
+        config.skip_repo_update = false
+
+        SourcesManager.expects(:update).never
+        analyzer = Pod::Installer::Analyzer.new(config.sandbox, podfile, nil)
+        analyzer.stubs(:sources).returns([Source.new(non_git_repo)])
+        analyzer.analyze
+
+        FileUtils.rm_rf(non_git_repo)
+      end
+
       #--------------------------------------#
 
       it 'generates the libraries which represent the target definitions' do