[SourcesManager] Search robustness.

Closes #929

CHANGELOG.md

@@ -5,7 +5,9 @@
 ###### Bug fixes
 
 * Fix crash related to the specification of the workspace as a relative path.
-  [#917](https://github.com/CocoaPods/CocoaPods/issues/920)
+  [#920](https://github.com/CocoaPods/CocoaPods/issues/920)
+* Fix crash related to search from the command line.
+  [#929](https://github.com/CocoaPods/CocoaPods/issues/929)
 
 ###### Ancillary enhancements
 

lib/cocoapods/sources_manager.rb

@@ -95,10 +95,14 @@ module Pod
       def updated_search_index
         if search_index_path.exist?
           stored_index = YAML.load(search_index_path.read)
+          if stored_index && stored_index.is_a?(Hash)
             search_index = aggregate.update_search_index(stored_index)
           else
             search_index = aggregate.generate_search_index
           end
+        else
+          search_index = aggregate.generate_search_index
+        end
 
         File.open(search_index_path, 'w') {|f| f.write(search_index.to_yaml) }
         search_index

spec/unit/sources_manager_spec.rb

@@ -59,7 +59,7 @@ module Pod
       end
 
       it "updates the search index before performing a search if it exits" do
-        FileUtils.touch(SourcesManager.search_index_path)
+        File.open(SourcesManager.search_index_path, 'w') { |file| file.write("---\nBananaLib:\n  version: 0.0.1") }
         Source::Aggregate.any_instance.stubs(:all).returns([@test_source])
         Source::Aggregate.any_instance.expects(:generate_search_index).never
         Source::Aggregate.any_instance.expects(:update_search_index).returns({'BananaLib' => {}})