From e86e5ec3a7c087c36d12a3d053ec6cb253bcc556 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Sun, 9 Apr 2017 17:05:27 +0200
Subject: [PATCH] add a script for updating the kernel

Add a script for easily updating a kernel to a newer release, while
refreshing the patches, ensuring they still apply (and optionally also
ensure they build).

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
 update_kernel.sh | 161 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100755 update_kernel.sh

diff --git a/update_kernel.sh b/update_kernel.sh
new file mode 100755
index 0000000..061e6e7
--- /dev/null
+++ b/update_kernel.sh
@@ -0,0 +1,161 @@
+#!/bin/sh
+#
+# update_kernel.sh: (c) 2017 Jonas Gorski <jonas.gorski@gmail.com>
+# Licensed under the terms of the GNU GPL License version 2
+
+BUILD=0
+BUILD_ARGS=
+VERBOSE=w
+TEST=0
+UPDATE=0
+
+KERNEL=
+PATCHVER=
+
+while [ $# > 0 ]; do
+	case $1 in
+		-b|--build)
+			BUILD=1
+			shift
+			BUILD_ARGS=$1
+			;;
+		-q|--quiet)
+			VERBOSE=
+			;;
+		-t|--test)
+			TEST=1
+			;;
+		-u|--update)
+			UPDATE=1
+			;;
+		-v|--verbose)
+			VERBOSE=ws
+			;;
+		[1-9]*)
+			if [ -z "$KERNEL" ]; then
+				KERNEL=$1
+			elif [ -z "$PATCHVER" ]; then
+				PATCHVER=$1
+			else
+				exit 1
+			fi
+			;;
+		*)
+			break
+			;;
+
+	esac
+
+	shift
+done
+
+if [ -z "$KERNEL" ]; then
+	echo "usage: $0 [<options>...] <patchver> [<version>]"
+	echo "example: $0 3.18 3.18.30"
+	echo "If <version> is not given, it will try to find out the latest from kernel.org"
+	echo ""
+	echo "valid options:"
+	echo "-b|--build <args> also do a test build with <args> as extra arguments (e.g. -j 3)"
+	echo "-q|--quiet        less output"
+	echo "-t|--test         don't do anything, just print what it would do"
+	echo "-u|--update       update include/kernel-version.mk after a successful run"
+	echo "-v|--verbose      more output (pass V=ws to all commands)"
+	exit 1
+fi
+
+if [ -z "$PATCHVER" ]; then
+	if [ -n "$(which curl)" ]; then
+		DL_CMD="curl -s "
+	fi
+
+	if [ -n "$(which wget)" ]; then
+		DL_CMD="wget -O - -q "
+	fi
+
+	if [ -z "$DL_CMD" ]; then
+		echo "Failed to find a suitable download program. Please install either curl or wget." >&2
+		exit 1
+	fi
+
+	# https://www.kernel.org/feeds/kdist.xml
+	# $(curl -s https://www.kernel.org/feeds/kdist.xml | sed -ne 's|^.*"html_url": "\(.*/commit/.*\)",|\1.patch|p')
+	# curl -s "https://www.kernel.org/feeds/kdist.xml"
+	CURR_VERS=$($DL_CMD "https://www.kernel.org/feeds/kdist.xml" | sed -ne 's|^.*title>\([1-9][^\w]*\): .*|\1|p')
+
+	for ver in $CURR_VERS; do
+		case $ver in
+			"$KERNEL"*)
+				PATCHVER=$ver
+				;;
+		esac
+
+		if [ -n "$PATCHVER" ]; then
+			break
+		fi
+	done
+
+	if [ -z "$PATCHVER" ]; then
+		echo "Failed to find the latest release on kernel.org, please specify the release manually" >&2
+		exit 1
+	fi
+fi
+
+echo "Refreshing Kernel $KERNEL to release $PATCHVER ..."
+
+targets=$(ls -b target/linux)
+
+if [ "$TEST" -eq 1 ]; then
+	CMD="echo"
+fi
+
+for target in $targets; do
+	if [ "$target" = "generic" -o -f "$target" ]; then
+		continue
+	fi
+
+	grep -q "broken" target/linux/$target/Makefile && { \
+		echo "Skipping $target (broken)"
+		continue
+	}
+
+	if [ -e tmp/${target}_${PATCHVER}_done ]; then
+		continue
+	fi
+
+	grep -q "${PATCHVER}" target/linux/$target/Makefile || \
+	[ -f target/linux/$target/config-${KERNEL} ] || \
+	[ -d target/linux/$target/patches-${KERNEL} ] && {
+		echo "refreshing $target ..."
+		$CMD echo "CONFIG_TARGET_$target=y" > .config || exit 1
+		$CMD echo "CONFIG_ALL_KMODS=y" >> .config || exit 1
+		$CMD make defconfig KERNEL_PATCHVER=${KERNEL} || exit 1
+		if [ ! -f tmp/${target}_${PATCHVER}_refreshed ]; then
+			$CMD make target/linux/refresh V=$VERBOSE KERNEL_PATCHVER=${KERNEL} LINUX_VERSION=${PATCHVER} LINUX_KERNEL_HASH=skip || exit 1
+			$CMD make target/linux/prepare V=$VERBOSE KERNEL_PATCHVER=${KERNEL} LINUX_VERSION=${PATCHVER} || exit 1
+			$CMD touch tmp/${target}_${PATCHVER}_refreshed
+		fi
+		if [ "$BUILD" = "1" ]; then
+			echo "building $target ... "
+			$CMD make V=$VERBOSE KERNEL_PATCHVER=${KERNEL} LINUX_VERSION=${PATCHVER} $BUILD_ARGS || exit 1
+		fi
+		$CMD make target/linux/clean
+		$CMD touch tmp/${target}_${PATCHVER}_done
+	} || {
+		echo "skipping $target (no support for $KERNEL)"
+	}
+done
+
+if [ "$UPDATE" -eq 1 ]; then
+	NEWVER=${PATCHVER#$KERNEL}
+	if [ "$TEST" -eq 1 ]; then
+		echo ./staging_dir/host/bin/mkhash sha256 dl/linux-$PATCHVER.tar.xz
+	fi
+
+	if [ -f dl/linux-$PATCHVER.tar.xz ]; then
+		CHECKSUM=$(./staging_dir/host/bin/mkhash sha256 dl/linux-$PATCHVER.tar.xz)
+	fi
+
+	$CMD sed -i include/kernel-version.mk \
+		-e "s|LINUX_VERSION-${KERNEL} =.*|LINUX_VERSION-${KERNEL} = ${NEWVER}|" \
+		-e "s|LINUX_KERNEL_HASH-${KERNEL}.*|LINUX_KERNEL_HASH-${PATCHVER} = ${CHECKSUM}|"
+fi
-- 
2.30.2