Don't let the user run as root

Closes #1815

CHANGELOG.md

@@ -25,6 +25,10 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
   [Kyle Fuller](https://github.com/kylef)
   [#2010](https://github.com/CocoaPods/CocoaPods/issues/2010)
 
+* Prevent the user from using `pod` commands as root  
+  [Kyle Fuller](https://github.com/kylef)
+  [#1815](https://github.com/CocoaPods/CocoaPods/issues/1815)
+
 ## 0.31.1
 [CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.31.1...0.31.0)
 • [CocoaPods-Core](https://github.com/CocoaPods/Core/compare/0.31.1...0.31.0)

lib/cocoapods/command.rb

@@ -43,11 +43,14 @@ module Pod
     end
 
     def self.run(argv)
+      help! "You cannot run CocoaPods as root." if Process.uid == 0
+
       argv = CLAide::ARGV.new(argv)
       if argv.flag?('version')
         UI.puts VERSION
         exit 0
       end
+
       super(argv)
       UI.print_warnings
     end

spec/functional/command_spec.rb

@@ -14,5 +14,9 @@ module Pod
       UI.output.should.include 'spec/fixtures/spec-repos/master/AFNetworking'
     end
 
+    it "doesn't let you run as root" do
+      Process.stubs(:uid).returns(0)
+      lambda { Pod::Command.run(['--version']) }.should.raise CLAide::Help
+    end
   end
 end