Merge pull request #3506 from dbarden/installer_broken_symlink

[Installer] Check for regular file on lock

CHANGELOG.md

@@ -15,6 +15,9 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
 * C++ source files with `.cc` extension now have their compiler flags set correctly.  
   [Chongyu Zhu](https://github.com/lembacon)
 
+* Handle broken symlinks when installing a Pod.  
+  [Daniel Barden](https://github.com/dbarden)
+  [#3515](https://github.com/cocoapods/cocoapods/issues/3515)
 
 ## 0.37.0
 

lib/cocoapods/installer/pod_source_installer.rb

@@ -103,7 +103,7 @@ module Pod
         # We don't want to lock diretories, as that forces you to override
         # those permissions if you decide to delete the Pods folder.
         Dir.glob(root + '**/*').each do |file|
-          unless File.directory?(file)
+          if File.file?(file)
             File.chmod(0444, file)
           end
         end