Don't try to commit unchanged specs on push

lib/cocoapods/command/push.rb

@@ -8,7 +8,7 @@ module Pod
 
       self.description = <<-DESC
         Validates NAME.podspec or `*.podspec' in the current working dir, creates
-        a directory and version folder for the pod in the local copy of 
+        a directory and version folder for the pod in the local copy of
         REPO (~/.cocoapods/[REPO]), copies the podspec file into the version directory,
         and finally it pushes REPO to its remote.
       DESC
@@ -79,7 +79,7 @@ module Pod
       #
       # @todo   Add specs for staged and unstaged files.
       #
-      # @todo   Gracefully handle the case where source is not under git 
+      # @todo   Gracefully handle the case where source is not under git
       #         source control.
       #
       # @return [void]
@@ -117,13 +117,18 @@ module Pod
           else
             message = "[Add] #{spec}"
           end
-          UI.puts " - #{message}"
 
           FileUtils.mkdir_p(output_path)
           FileUtils.cp(spec_file, output_path)
           Dir.chdir(repo_dir) do
-            git!("add #{spec.name}")
-            git!("commit --no-verify -m '#{message}'")
+            # only commit if modified
+            if git!("status --porcelain 2>&1") =~ /#{spec.name}/
+              UI.puts " - #{message}"
+              git!("add #{spec.name}")
+              git!("commit --no-verify -m '#{message}'")
+            else
+              UI.puts " - [No change] #{spec}"
+            end
           end
         end
       end

spec/functional/command/push_spec.rb

@@ -53,11 +53,15 @@ module Pod
       end
 
       # prepare the spec
-      spec = (fixture('spec-repos') + 'master/JSONKit/1.4/JSONKit.podspec').read
+      spec = (fixture('spec-repos') + 'test_repo/JSONKit/1.4/JSONKit.podspec').read
       spec_fix = spec.gsub(/https:\/\/github\.com\/johnezang\/JSONKit\.git/, fixture('integration/JSONKit').to_s)
       spec_add = spec.gsub(/'JSONKit'/, "'PushTest'")
+
+      spec_clean = (fixture('spec-repos') + 'test_repo/BananaLib/1.0/BananaLib.podspec').read
+
       File.open(temporary_directory + 'JSONKit.podspec',  'w') {|f| f.write(spec_fix) }
       File.open(temporary_directory + 'PushTest.podspec', 'w') {|f| f.write(spec_add) }
+      File.open(temporary_directory + 'BananaLib.podspec', 'w') {|f| f.write(spec_clean) }
     end
 
     it "refuses to push if the repo is not clean" do
@@ -79,6 +83,7 @@ module Pod
       Dir.chdir(temporary_directory) { cmd.run }
       Pod::UI.output.should.include('[Add] PushTest (1.4)')
       Pod::UI.output.should.include('[Fix] JSONKit (1.4)')
+      Pod::UI.output.should.include('[No change] BananaLib (1.0)')
       Dir.chdir(@upstream) { `git checkout master -q` }
       (@upstream + 'PushTest/1.4/PushTest.podspec').read.should.include('PushTest')
     end