x86: upgrade: use get_image_dd

Ref: https://bugs.openwrt.org/index.php?do=details&task_id=3140
Reported-by: Philip Prindeville <[email protected]>
Signed-off-by: Yousong Zhou <[email protected]>
Reviewed-By: Philip Prindeville <[email protected]>

target/linux/x86/base-files/lib/upgrade/platform.sh

@@ -20,7 +20,7 @@ platform_check_image() {
 	get_partitions "/dev/$diskdev" bootdisk
 
 	#extract the boot sector from the image
-	get_image "$@" | dd of=/tmp/image.bs count=63 bs=512b 2>/dev/null
+	get_image_dd "$1" of=/tmp/image.bs count=63 bs=512b
 
 	get_partitions /tmp/image.bs image
 
@@ -83,7 +83,7 @@ platform_do_upgrade() {
 		get_partitions "/dev/$diskdev" bootdisk
 
 		#extract the boot sector from the image
-		get_image "$@" | dd of=/tmp/image.bs count=63 bs=512b >/dev/null
+		get_image_dd "$1" of=/tmp/image.bs count=63 bs=512b
 
 		get_partitions /tmp/image.bs image
 
@@ -94,7 +94,7 @@ platform_do_upgrade() {
 	fi
 
 	if [ -n "$diff" ]; then
-		get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
+		get_image_dd "$1" of="/dev/$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
@@ -108,7 +108,7 @@ platform_do_upgrade() {
 	while read part start size; do
 		if export_partdevice partdev $part; then
 			v "Writing image to /dev/$partdev..."
-			get_image "$@" | dd of="/dev/$partdev" ibs=512 obs=1M skip="$start" count="$size" conv=fsync
+			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
@@ -116,7 +116,7 @@ platform_do_upgrade() {
 
 	#copy partition uuid
 	v "Writing new UUID to /dev/$diskdev..."
-	get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
+	get_image_dd "$1" of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
 
 	platform_do_bootloader_upgrade "$diskdev"
 	local parttype=ext4