Initial commit

target/linux/stm32/base-files/lib/preinit/79_move_config

@@ -0,0 +1,15 @@
+
+move_config() {
+	. /lib/upgrade/common.sh
+	. /lib/upgrade/platform.sh
+
+	if export_bootdevice && export_partdevice partdev 4; then
+		mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
+		if [ -f "/mnt/$BACKUP_FILE" ]; then
+			mv -f "/mnt/$BACKUP_FILE" /
+		fi
+		umount /mnt
+	fi
+}
+
+boot_hook_add preinit_mount_root move_config

target/linux/stm32/base-files/lib/upgrade/platform.sh

@@ -0,0 +1,181 @@
+REQUIRE_IMAGE_METADATA=1
+
+UBOOT_ENV_PART=3
+BOOT_PART=4
+ROOTFS_PART=5
+
+RAMFS_COPY_BIN='blockdev'
+
+export_bootdevice() {
+	local cmdline uuid blockdev uevent line class
+	local MAJOR MINOR DEVNAME DEVTYPE
+	local rootpart="$(cmdline_get_var root)"
+
+	case "$rootpart" in
+		PARTUUID=????????-????-????-????-??????????0?/PARTNROFF=1 | \
+		PARTUUID=????????-????-????-????-??????????05)
+			uuid="${rootpart#PARTUUID=}"
+			uuid="${uuid%/PARTNROFF=1}"
+			uuid="${uuid%0?}00"
+			for disk in $(find /dev -type b); do
+				set -- $(dd if=$disk bs=1 skip=568 count=16 2>/dev/null | hexdump -v -e '8/1 "%02x "" "2/1 "%02x""-"6/1 "%02x"')
+				if [ "$4$3$2$1-$6$5-$8$7-$9" = "$uuid" ]; then
+					uevent="/sys/class/block/${disk##*/}/uevent"
+					break
+				fi
+			done
+		;;
+	esac
+
+	if [ -e "$uevent" ]; then
+		while read line; do
+			export -n "$line"
+		done < "$uevent"
+		export BOOTDEV_MAJOR=$MAJOR
+		export BOOTDEV_MINOR=$MINOR
+		return 0
+	fi
+
+	return 1
+}
+
+platform_check_image() {
+	local diskdev partdev diff
+
+        [ "$#" -gt 1 ] && return 1
+
+	export_bootdevice && export_partdevice diskdev 0 || {
+		v "platform_check_image: Unable to determine upgrade device"
+		return 1
+	}
+
+	get_partitions "/dev/$diskdev" bootdisk
+
+	v "Extract the boot sector from the image"
+	get_image_dd "$1" of=/tmp/image.bs count=63 bs=512b
+
+	get_partitions /tmp/image.bs image
+
+	#compare tables
+	diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
+
+	rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
+
+	if [ -n "$diff" ]; then
+		echo "Partition layout has changed. Full image will be written."
+		ask_bool 0 "Abort" && exit 1
+		return 0
+	fi
+}
+
+platform_do_upgrade() {
+	local diskdev partdev diff partlabel
+
+	export_bootdevice && export_partdevice diskdev 0 || {
+		v "platform_do_upgrade: Unable to determine upgrade device"
+		return 1
+	}
+
+	sync
+
+	if [ "$UPGRADE_OPT_SAVE_PARTITIONS" = "1" ]; then
+		get_partitions "/dev/$diskdev" bootdisk
+
+		v "Extract boot sector from the image"
+		get_image_dd "$1" of=/tmp/image.bs count=63 bs=512b
+
+		get_partitions /tmp/image.bs image
+
+		#compare tables
+		diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
+	else
+		diff=1
+	fi
+
+	if [ -n "$diff" ]; then
+		rm -rf /tmp/ubootenv
+
+		if export_partdevice partdev $UBOOT_ENV_PART; then
+			v "Saving u-boot env (/dev/$partdev) before to write image"
+			get_image_dd "/dev/$partdev" of=/tmp/ubootenv
+		fi
+
+		v "Writing image to /dev/$diskdev..."
+		get_image_dd "$1" of="/dev/$diskdev" conv=fsync
+
+		blockdev --rereadpt "/dev/$diskdev"
+
+		[ -f /tmp/ubootenv ] && {
+			# iterate over each partition from the image to find the
+			# u-boot-env partition and restore u-boot env.
+			while read part start size; do
+				if export_partdevice partdev $part; then
+					while read line; do
+						eval "local l$line"
+					done < "/sys/class/block/$partdev/uevent"
+
+					[ "$lPARTNAME" = "u-boot-env" ] || continue
+
+					v "Writting u-boot env to /dev/$partdev"
+					get_image_dd /tmp/ubootenv of="/dev/$partdev" conv=fsync
+
+					return 0
+				fi
+			done < /tmp/partmap.image
+		}
+		return 0
+	fi
+
+	#iterate over each partition from the image and write it to the boot disk
+	while read part start size; do
+		if export_partdevice partdev $part; then
+			# do not erase u-boot env
+			[ "$part" = "$UBOOT_ENV_PART" ] && continue
+
+			v "Writing image to /dev/$partdev..."
+			v "Normal partition, doing DD"
+			get_image_dd "$1" of="/dev/$partdev" ibs=512 obs=1M skip="$start" \
+				count="$size" conv=fsync
+		else
+			v "Unable to find partition $part device, skipped."
+		fi
+	done < /tmp/partmap.image
+
+	if export_partdevice partdev "$BOOT_PART"; then
+		mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
+		local partuuid="$(cmdline_get_var root)"
+		v "Setting rootfs ${partuuid}"
+		sed -i "s/PARTUUID=[a-f0-9-]\+/${partuuid}/ig" \
+			/mnt/extlinux/extlinux.conf
+		umount /mnt
+	fi
+}
+
+platform_copy_config() {
+	local partdev
+
+	# Iterate over each partition from the image to find the boot partition
+	# and copy the config tarball.
+	# The partlabel is used to find the partition.
+	# An hardcoded partition number cannot be used, as it could be wrong if
+	# the partition table changed, and the full image was written.
+	while read part start size; do
+		# config is copied in the boot partition, as for squashfs image, the
+		# rootfs partition is not writable.
+		if export_partdevice partdev "$part"; then
+			while read line; do
+				eval "local l$line"
+			done < "/sys/class/block/$partdev/uevent"
+
+			[ "$lPARTNAME" = "boot" ] || continue
+
+			mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
+			cp -af "$UPGRADE_BACKUP" "/mnt/$BACKUP_FILE"
+			umount /mnt
+			return 0
+		else
+			v "ERROR: Unable to find partition to copy config data to"
+		fi
+	done < /tmp/partmap.image
+}
+