Just remove write permissions from files, so executables are unaffected (#3501)

CHANGELOG.md

@@ -23,6 +23,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [#3501](https://github.com/CocoaPods/CocoaPods/issues/3501)
   [#3515](https://github.com/cocoapods/cocoapods/issues/3515)
 
+* Just remove write permissions from files, so executables are unaffected.  
+  [Mason Glidden](https://github.com/mglidden)
+  [#3501](https://github.com/CocoaPods/CocoaPods/issues/3501)
+
 ## 0.37.0
 
 For more details, see 📝 [CocoaPods 0.37](http://blog.cocoapods.org/CocoaPods-0.37/) on our blog.

lib/cocoapods/installer/pod_source_installer.rb

@@ -104,7 +104,10 @@ module Pod
         # those permissions if you decide to delete the Pods folder.
         Dir.glob(root + '**/*').each do |file|
           if File.file?(file)
-            File.chmod(0444, file)
+            # Only remove write permission, since some pods (like Crashlytics)
+            # have executable files.
+            new_permissions = File.stat(file).mode & ~0222
+            File.chmod(new_permissions, file)
           end
         end
       end