From 2df71b654e37d453c5ddcc03fdd22be1cbd6002d Mon Sep 17 00:00:00 2001
From: niusmallnan <niusmallnan@gmail.com>
Date: Sun, 13 May 2018 10:57:07 +0800
Subject: [PATCH] Use gzip to compress system-docker images for dev build

---
 scripts/tar-images | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/scripts/tar-images b/scripts/tar-images
index dd98b8c5..6882a171 100755
--- a/scripts/tar-images
+++ b/scripts/tar-images
@@ -17,6 +17,13 @@ if [ -e ".make-vmware" ]; then
     IMAGES="$IMAGES rancher/os-openvmtools:${OPEN_VMTOOLS_VERSION}"
 fi
 
-echo "tar-images: docker save ${IMAGES} > build/images.tar"
-docker save ${IMAGES} | xz > build/images.tar
+echo "tar-images: docker save ${IMAGES}"
+if [ "$COMPRESS" == "" ]; then
+    docker save ${IMAGES} | gzip > build/images.tar
+else
+    # system-docker can not load images which compressed by xz with a compression level of 9
+    # decompression consumes more memory if using level 9
+    # the default compression level for xz is 6
+    docker save ${IMAGES} | xz -6 -e > build/images.tar
+fi
 echo "tar-images: DONE"