From 58b84676d0c1c5334bbc0bb34ea00b2e0e7c83fe Mon Sep 17 00:00:00 2001
From: Praveen Kumar <kumarpraveen.nitdgp@gmail.com>
Date: Thu, 12 Jul 2018 16:24:16 +0530
Subject: [PATCH] Issue #475 Add flag for image compress layer for oci
 destination

Signed-off-by: Praveen Kumar <kumarpraveen.nitdgp@gmail.com>
---
 .gitignore             |  3 +++
 oci/layout/oci_dest.go | 11 ++++++++---
 types/types.go         |  2 ++
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/.gitignore b/.gitignore
index a085e431..3f7bdaa0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,6 @@ tools.timestamp
 
 # Visual Studio Code
 .vscode/*
+
+# trash
+trash.lock
diff --git a/oci/layout/oci_dest.go b/oci/layout/oci_dest.go
index 0a0cad15..35163275 100644
--- a/oci/layout/oci_dest.go
+++ b/oci/layout/oci_dest.go
@@ -18,9 +18,10 @@ import (
 )
 
 type ociImageDestination struct {
-	ref           ociReference
-	index         imgspecv1.Index
-	sharedBlobDir string
+	ref                      ociReference
+	index                    imgspecv1.Index
+	sharedBlobDir            string
+	acceptUncompressedLayers bool
 }
 
 // newImageDestination returns an ImageDestination for writing to an existing directory.
@@ -43,6 +44,7 @@ func newImageDestination(sys *types.SystemContext, ref ociReference) (types.Imag
 	d := &ociImageDestination{ref: ref, index: *index}
 	if sys != nil {
 		d.sharedBlobDir = sys.OCISharedBlobDirPath
+		d.acceptUncompressedLayers = sys.OCIAcceptUncompressedLayers
 	}
 
 	if err := ensureDirectoryExists(d.ref.dir); err != nil {
@@ -81,6 +83,9 @@ func (d *ociImageDestination) SupportsSignatures(ctx context.Context) error {
 }
 
 func (d *ociImageDestination) DesiredLayerCompression() types.LayerCompression {
+	if d.acceptUncompressedLayers {
+		return types.PreserveOriginal
+	}
 	return types.Compress
 }
 
diff --git a/types/types.go b/types/types.go
index 3ec77e0d..5d05b711 100644
--- a/types/types.go
+++ b/types/types.go
@@ -364,6 +364,8 @@ type SystemContext struct {
 	OCIInsecureSkipTLSVerify bool
 	// If not "", use a shared directory for storing blobs rather than within OCI layouts
 	OCISharedBlobDirPath string
+	// Allow UnCompress image layer for OCI image layer
+	OCIAcceptUncompressedLayers bool
 
 	// === docker.Transport overrides ===
 	// If not "", a directory containing a CA certificate (ending with ".crt"),