sysupgrade: on usb-upgrade do not modify image refs #17396

When upgrading from usb storage, do not modify the image
on the storage device

base-files/iop-files/lib/upgrade/iopsys.sh

@@ -296,7 +296,41 @@ check_sig() {
 	return 1
 }
 
+#if user upg by command line sysupgrade, so need to check image in usb disk
+
+image_in_usb()
+{
+        local from=$1
+        local file_name=$(basename $from)
+        local file_path
+        file_path="$(mount -t vfat | awk '{print $3}')"
+        if [ -z "$file_path" ];then
+                echo 0
+        else
+                find /mnt/ -name "$file_name" | grep -q mnt && echo 1 || echo 0
+        fi
+}
+
+
+do_usb_image_op(){
+	case "$1" in
+	save)
+		#check if the file exist in the usb disk
+		[ "$(image_in_usb $2)" == "1" ] && cp -f $2 $2.bak
+	;;
+	restore)
+		if [  -f $2.bak  ] ;then
+			mv  $2.bak $2
+		fi
+	;;
+	clean)
+		if [  -f $2.bak  ] ;then
+			rm -f $2.bak
+		fi
+	;;
+	esac
 
+}
 
 #--------------------------------------------------------------
 # Verify an Iopsys image is good for writing
@@ -326,6 +360,8 @@ iopsys_check_image() {
 			;;
 	esac
 
+	do_usb_image_op "save" $from
+
 	[ "$(check_crc $from)" == "CRC_OK" ] || {
 		echo "CRC check failed"
 		return 1
@@ -444,7 +480,8 @@ iopsys_upgrade() {
 	fi
 
 	# Product specific low level write to flash
-	target_upgrade $from || return
+	target_upgrade $from || ( do_usb_image_op "clean" $from ; return )
+	do_usb_image_op "restore" $from
 }