sunxi: sysupgrade: sync with x86

sunxi sysupgrade was based on the x86 implementation; sync fixes and other
changes from the current x86 version:

x86: fix sysupgrades on disks with 4k block size
x86: sysupgrade: move partition table change check to platform_check_image
x86: sysupgrade: refactor platform_do_upgrade
x86: sysupgrade: explicitly rescan disk after writing partition table

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

target/linux/sunxi/Makefile

@@ -28,6 +28,6 @@ KERNELNAME:=zImage dtbs
 include $(INCLUDE_DIR)/target.mk
 
 DEFAULT_PACKAGES += uboot-envtools
-DEFAULT_PACKAGES += mkf2fs e2fsprogs
+DEFAULT_PACKAGES += partx-utils mkf2fs e2fsprogs
 
 $(eval $(call BuildTarget))

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

@@ -1,5 +1,28 @@
 platform_check_image() {
-	true
+	local diskdev partdev diff
+
+	export_bootdevice && export_partdevice diskdev -2 || {
+		echo "Unable to determine upgrade device"
+		return 1
+	}
+
+	get_partitions "/dev/$diskdev" bootdisk
+
+	#extract the boot sector from the image
+	get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
+
+	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_copy_config() {
@@ -13,20 +36,18 @@ platform_copy_config() {
 }
 
 platform_do_upgrade() {
-	local diskdev partdev ibs diff
+	local diskdev partdev diff
+
+	export_bootdevice && export_partdevice diskdev -2 || {
+		echo "Unable to determine upgrade device"
+		return 1
+	}
 
-	if export_bootdevice && export_partdevice diskdev -2; then
 	sync
+
 	if [ "$SAVE_PARTITIONS" = "1" ]; then
 		get_partitions "/dev/$diskdev" bootdisk
 
-			#get block size
-			if [ -f "/sys/block/$diskdev/queue/physical_block_size" ]; then
-				ibs="$(cat "/sys/block/$diskdev/queue/physical_block_size")"
-			else
-				ibs=512
-			fi
-
 		#extract the boot sector from the image
 		get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
 
@@ -34,11 +55,18 @@ platform_do_upgrade() {
 
 		#compare tables
 		diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
-			if [ -n "$diff" ]; then
+	else
-				echo "Partition layout is changed.  Full image will be written."
+		diff=1
-				ask_bool 0 "Abort" && exit
+	fi
 
+	if [ -n "$diff" ]; then
 		get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
+
+		# Separate removal and addtion is necessary; otherwise, partition 1
+		# will be missing if it overlaps with the old partition 2
+		partx -d - "/dev/$diskdev"
+		partx -a - "/dev/$diskdev"
+
 		return 0
 	fi
 
@@ -49,7 +77,7 @@ platform_do_upgrade() {
 		part="$(($part - 2))"
 		if export_partdevice partdev $part; then
 			echo "Writing image to /dev/$partdev..."
-					get_image "$@" | dd of="/dev/$partdev" ibs="$ibs" obs=1M skip="$start" count="$size" conv=fsync
+			get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
 		else
 			echo "Unable to find partition $part device, skipped."
 		fi
@@ -58,10 +86,4 @@ platform_do_upgrade() {
 	#copy partition uuid
 	echo "Writing new UUID to /dev/$diskdev..."
 	get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
-		else
-			get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
-		fi
-
-		sleep 1
-	fi
 }