pkg/archive: gzDecompress(): use local vars for MOBY_DISABLE_PIGZ

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

pkg/archive/archive.go

@@ -143,20 +143,15 @@ func xzDecompress(ctx context.Context, archive io.Reader) (io.ReadCloser, error)
 }
 
 func gzDecompress(ctx context.Context, buf io.Reader) (io.ReadCloser, error) {
-	noPigzEnv := os.Getenv("MOBY_DISABLE_PIGZ")
-	var noPigz bool
-
-	if noPigzEnv != "" {
-		var err error
-		noPigz, err = strconv.ParseBool(noPigzEnv)
+	if noPigzEnv := os.Getenv("MOBY_DISABLE_PIGZ"); noPigzEnv != "" {
+		noPigz, err := strconv.ParseBool(noPigzEnv)
 		if err != nil {
 			logrus.WithError(err).Warn("invalid value in MOBY_DISABLE_PIGZ env var")
 		}
-	}
-
-	if noPigz {
-		logrus.Debugf("Use of pigz is disabled due to MOBY_DISABLE_PIGZ=%s", noPigzEnv)
-		return gzip.NewReader(buf)
+		if noPigz {
+			logrus.Debugf("Use of pigz is disabled due to MOBY_DISABLE_PIGZ=%s", noPigzEnv)
+			return gzip.NewReader(buf)
+		}
 	}
 
 	unpigzPath, err := exec.LookPath("unpigz")