From 3c5d2e4661e76e83e35637561153578ddd87f249 Mon Sep 17 00:00:00 2001
From: unclejack <unclejacksons@gmail.com>
Date: Tue, 2 Apr 2013 02:16:28 +0300
Subject: [PATCH 1/2] add support for xz compression

This adds xz as a compression option.
xz is alread supported by bsdtar without the external xz program.
---
 archive.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/archive.go b/archive.go
index 0421c51768..d09d3d6b97 100644
--- a/archive.go
+++ b/archive.go
@@ -15,6 +15,7 @@ const (
 	Uncompressed Compression = iota
 	Bzip2
 	Gzip
+	Xz
 )
 
 func (compression *Compression) Flag() string {
@@ -23,6 +24,8 @@ func (compression *Compression) Flag() string {
 		return "j"
 	case Gzip:
 		return "z"
+	case Xz:
+		return "J"
 	}
 	return ""
 }

From 0ddc6867fb86d2539bb19034844ac8c2369060c1 Mon Sep 17 00:00:00 2001
From: unclejack <unclejacksons@gmail.com>
Date: Tue, 2 Apr 2013 02:19:34 +0300
Subject: [PATCH 2/2] use xz compression when pushing images to the registry

This makes the xz compression the default.
---
 registry.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/registry.go b/registry.go
index f1d6801f5f..62b1fac094 100644
--- a/registry.go
+++ b/registry.go
@@ -267,14 +267,14 @@ func (graph *Graph) PushImage(stdout io.Writer, imgOrig *Image, authConfig *auth
 
 		// FIXME: Don't do this :D. Check the S3 requierement and implement chunks of 5MB
 		// FIXME2: I won't stress it enough, DON'T DO THIS! very high priority
-		layerData2, err := Tar(path.Join(graph.Root, img.Id, "layer"), Gzip)
+		layerData2, err := Tar(path.Join(graph.Root, img.Id, "layer"), Xz)
 		tmp, err := ioutil.ReadAll(layerData2)
 		if err != nil {
 			return err
 		}
 		layerLength := len(tmp)
 
-		layerData, err := Tar(path.Join(graph.Root, img.Id, "layer"), Gzip)
+		layerData, err := Tar(path.Join(graph.Root, img.Id, "layer"), Xz)
 		if err != nil {
 			return fmt.Errorf("Failed to generate layer archive: %s", err)
 		}