[Repo remove] Handle file permission errors

Fixes #1778

CHANGELOG.md

@@ -19,6 +19,12 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
 * Improves `pod init` to save Xcode project file in Podfile when one was supplied.  
   [Kyle Fuller](https://github.com/kylef)
 
+###### Bug Fixes
+
+* Fixes a bug with `pod repo remove` silently handling permission errors.  
+  [Kyle Fuller](https://github.com/kylef)
+  #1778
+
 
 ## 0.29.0
 [CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.28.0...0.29.0)

lib/cocoapods/command/repo.rb

@@ -163,6 +163,8 @@ def validate!
           super
           help! 'Deleting a repo needs a `NAME`.' unless @name
           help! "repo #{@name} does not exist" unless File.directory?(dir)
+          help! "You do not have permission to delete the #{@name} repository." \
+                "Perhaps try prefixing this command with sudo." unless File.writable?(dir)
         end
 
         def run

spec/functional/command/repo_spec.rb

@@ -104,6 +104,14 @@ module Pod
         lambda { run_command('repo', 'remove', 'nonexistant') }.should.raise CLAide::Help
       end
 
+      it "complains if we do not have permission" do
+        File.stubs(:writable?).returns(false)
+        upstream = SpecHelper.temporary_directory + 'upstream'
+        FileUtils.cp_r(test_repo_path, upstream)
+        lambda { run_command('repo', 'remove', upstream) }.should.raise CLAide::Help
+        FileUtils.rm_rf(upstream)
+      end
+
       it "removes a spec-repo" do
         upstream = SpecHelper.temporary_directory + 'upstream'
         FileUtils.cp_r(test_repo_path, upstream)