only create bzip file if needed. #415

utils/compress.go

@@ -11,7 +11,7 @@ import (
 //
 // It uses internal gzip and external bzip2, see:
 // https://code.google.com/p/go/issues/detail?id=4828
-func CompressFile(source *os.File) error {
+func CompressFile(source *os.File, onlyGzip bool) error {
 	gzPath := source.Name() + ".gz"
 	gzFile, err := os.Create(gzPath)
 	if err != nil {
@@ -24,7 +24,7 @@ func CompressFile(source *os.File) error {
 
 	source.Seek(0, 0)
 	_, err = io.Copy(gzWriter, source)
-	if err != nil {
+	if err != nil || onlyGzip {
 		return err
 	}
 

utils/compress_test.go

@@ -27,7 +27,7 @@ func (s *CompressSuite) TearDownTest(c *C) {
 }
 
 func (s *CompressSuite) TestCompress(c *C) {
-	err := CompressFile(s.tempfile)
+	err := CompressFile(s.tempfile, false)
 	c.Assert(err, IsNil)
 
 	buf := make([]byte, len(testString))