The arithmetic expansion fails when idx becomes a two digit number.
Fix this by relying on expr command.
root@OpenWrt:/# echo $(((028 + 0) % 1000))
/bin/ash: arithmetic syntax error
root@OpenWrt:/# echo $(($(expr 028 + 0) % 1000))
28
Fixes: a6a0b252baa6 ("bcm4908: add sysupgrade support")
Signed-off-by: Sungbo Eo <mans0n@gorani.run>
# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
-RAMFS_COPY_BIN="bcm4908img"
+RAMFS_COPY_BIN="bcm4908img expr"
PART_NAME=firmware
umount $dir
rm -fr $dir
- idx=$(((idx + inc) % 1000))
+ idx=$(($(expr $idx + $inc) % 1000))
echo $(printf "cferam.%03d" $idx)
}