I think using Tempfile might have been causing some issues on Travis.

We don't need to use Tempfile anyway, we can stick the tarball in the pod root and then delete it.

lib/cocoapods/downloader/git.rb

@@ -75,13 +75,17 @@ module Pod
       end
       
       def download_and_extract_tarball(id)
-        Tempfile.open('tarball') do |tmpfile|
+        tmp_path = target_path + "tarball.tar.gz"
+
+        File.open(tmp_path, "w+") do |tmpfile|
           open tarball_url_for(id) do |archive|
             tmpfile.write Zlib::GzipReader.new(archive).read
           end
           
           system "tar zxf #{tmpfile.path} -C #{target_path} --strip-components 1"
         end
+        
+        FileUtils.rm_f(tmp_path)
       end
     end
   end

spec/functional/downloader_spec.rb

@@ -76,6 +76,17 @@ describe "Pod::Downloader" do
       # deliberately keep this assertion as loose as possible for now
       (@pod.root + 'README.md').readlines[0].should =~ /PusherTouch/
     end
+    
+    it 'deletes the downloaded tarball after unpacking it' do
+      @pod.specification.stubs(:source).returns(
+        :git => "git://github.com/lukeredpath/libPusher.git", :download_only => true
+      )
+      downloader = Pod::Downloader.for_pod(@pod)
+      
+      VCR.use_cassette('tarballs', :record => :new_episodes) { downloader.download }
+      
+      (@pod.root + 'tarball.tar.gz').should.not.exist
+    end
   end
   
   describe "for Mercurial" do