[Command::Repo::Push] Use URL to check wether it is master repo

https://github.com/CocoaPods/CocoaPods/pull/2153#issuecomment-43617235

lib/cocoapods/command/repo/push.rb

@@ -35,12 +35,10 @@ module Pod
         def validate!
           super
           help! "A spec-repo name is required." unless @repo
-          if @repo == 'master'
-            help! "To push to the master repo use the `pod trunk push` command"
-          end
         end
 
         def run
+          check_if_master_repo
           validate_podspec_files
           check_repo_status
           update_repo
@@ -57,6 +55,29 @@ module Pod
         extend Executable
         executable :git
 
+        # Temporary check to ensure that users do not push accidentally private
+        # specs to the master repo.
+        #
+        def check_if_master_repo
+          remotes = Dir.chdir(repo_dir) { `git remote -v 2>&1` }
+          master_repo_urls = [
+            'git@github.com:CocoaPods/Specs.git',
+            'https://github.com/CocoaPods/Specs.git',
+          ]
+          is_master_repo = master_repo_urls.any? do |url|
+            remotes.include?(url)
+          end
+
+          if is_master_repo
+            raise Informative, "To push to the CocoaPods master repo use " \
+              "the `pod trunk push` command.\n\nIf you are using a fork of " \
+              "the master repo for private purposes we recommend to migrate " \
+              "to a clean private repo. To disable this check remove the " \
+              "remote pointing to the CocoaPods master repo."
+          end
+        end
+
+
         # Performs a full lint against the podspecs.
         #
         def validate_podspec_files

spec/functional/command/repo/push_spec.rb

@@ -12,6 +12,7 @@ module Pod
     it "complains if it can't find the repo" do
       Dir.chdir(fixture('banana-lib')) do
         cmd = command('repo', 'push', 'missing_repo')
+        cmd.expects(:check_if_master_repo)
         cmd.expects(:validate_podspec_files).returns(true)
         e = lambda { cmd.run }.should.raise Informative
         e.message.should.match(/repo not found/)
@@ -64,6 +65,15 @@ module Pod
       File.open(temporary_directory + 'BananaLib.podspec', 'w') {|f| f.write(spec_clean) }
     end
 
+    it "refuses to push if the repo is not clean" do
+      Dir.chdir(test_repo_path) do
+        `git remote set-url origin https://github.com/CocoaPods/Specs.git`
+      end
+      cmd = command('repo', 'push', 'master')
+      e = lambda { cmd.run }.should.raise Pod::Informative
+      e.message.should.match(/use the `pod trunk push` command/)
+    end
+
     it "refuses to push if the repo is not clean" do
       Dir.chdir(test_repo_path) do
         `touch DIRTY_FILE`