Update Makefile to provision the ability of building with non-upstrea…

…m patches (sonic-net#296)

* Update Makefile to include non-upstream patches

This adds the ability to include patches that are not yet upstream into the kernel build. This is not meant to be used in regular SONiC builds.

Signed-off-by: Vivek Reddy <vkarri@nvidia.com>

* Fix external link approach

Signed-off-by: Vivek Reddy <vkarri@nvidia.com>

* Use MLNX_PATCH_LOC as an absolute path

Signed-off-by: Vivek Reddy <vkarri@nvidia.com>

* Use MLNX_PATCH_LOC as absolute path

Signed-off-by: Vivek Reddy <vkarri@nvidia.com>

* Update minor mistake

Signed-off-by: Vivek Reddy <vkarri@nvidia.com>

* Removed hard-coded req on compression algo

Signed-off-by: Vivek Reddy <vkarri@nvidia.com>

* Handle Comments

Signed-off-by: Vivek Reddy <vkarri@nvidia.com>

* Minor update

Signed-off-by: Vivek Reddy <vkarri@nvidia.com>

Signed-off-by: Vivek Reddy <vkarri@nvidia.com>

Makefile

@@ -56,6 +56,7 @@ SOURCE_FILE_BASE_URL="https://sonicstorage.blob.core.windows.net/debian-security
 DSC_FILE_URL = "$(SOURCE_FILE_BASE_URL)/$(DSC_FILE)"
 DEBIAN_FILE_URL = "$(SOURCE_FILE_BASE_URL)/$(DEBIAN_FILE)"
 ORIG_FILE_URL = "$(SOURCE_FILE_BASE_URL)/$(ORIG_FILE)"
+NON_UP_DIR = /tmp/non_upstream_patches
 
 $(addprefix $(DEST)/, $(MAIN_TARGET)): $(DEST)/% :
 	# Obtaining the Debian kernel source
@@ -99,6 +100,27 @@ $(addprefix $(DEST)/, $(MAIN_TARGET)): $(DEST)/% :
 	stg repair
 	stg import -s ../patch/series
 
+	rm -rf $(NON_UP_DIR)
+	mkdir -p $(NON_UP_DIR)
+
+	if [ ! -z ${EXTERNAL_KERNEL_PATCH_URL} ];  then
+		wget $(EXTERNAL_KERNEL_PATCH_URL) -O patches.tar
+		tar -xf patches.tar -C $(NON_UP_DIR)
+	fi
+
+	# Precedence is given for external URL
+	if [ -z ${EXTERNAL_KERNEL_PATCH_URL} ] && [ x${INCLUDE_EXTERNAL_PATCH_TAR} == xy ]; then
+		if [ -f "$(EXTERNAL_KERNEL_PATCH_TAR)" ]; then
+			tar -xf $(EXTERNAL_KERNEL_PATCH_TAR) -C $(NON_UP_DIR)
+		fi
+	fi
+
+	if [ -f "$(NON_UP_DIR)/series" ]; then
+		echo "External Patches applied:"
+		cat $(NON_UP_DIR)/series
+		stg import -s $(NON_UP_DIR)/series
+	fi
+
 	# Optionally add/remove kernel options
 	if [ -f ../manage-config ]; then
 		../manage-config $(CONFIGURED_ARCH) $(CONFIGURED_PLATFORM)