Custom script not running in Android 7

[meoit]

Hi friends,

Sorry for my bad English.

I am trying to add my_script.sh to get Total RAM size.

Then if the Total RAM size < 512 MB RAM, it's delete some APKs in /system/app

Here is the sequence I did.

1. Unpacking boot.img to get file init.rk30board.rc

2. In the init.rk30board.rc, added below on post-fs:

exec u:r:init:s0 root root -- /oem/my_script.sh

3. Put file my_script.sh to folder /oem/ of unpacking boot.img

Content of file my_script.sh

is_mounted() {
if [ -z "$2" ] ; then
cat /proc/mounts | grep $1 >/dev/null
else
cat /proc/mounts | grep $1 | grep "$2," >/dev/null
fi
return $?
}
#
cm_vd_dir=/vendor/etc/my_log
cm_vd_logfile=$cm_vd_dir/install.txt
#
rw_my_log()
{
if [ ! -f "$cm_vd_logfile" ]; then
touch $cm_vd_logfile
chmod 644 $cm_vd_logfile
fi
echo "$1" >> $cm_vd_logfile
}
#
ok_run_now()
{
TOT=`cat /proc/meminfo | grep MemTotal: | awk '{print $2}'`
rw_my_log "$TOT"
}
#
SYSTEM=$(resolve_link $(find /dev/block/platform -type l | grep -i -m 1 "/app$")) ||
SYSTEM=$(resolve_link $(find /dev/block/platform -type l | grep -i -m 1 "/system$"))
if (! is_mounted /system) ; then mount -o rw /system ; fi
if (! is_mounted /system rw) ; then mount -o rw,remount /system ; fi
if (! is_mounted /system rw) ; then mount -t ext4 -o rw $SYSTEM /system ; fi
if (! is_mounted /system rw) ; then mount -t f2fs -o rw $SYSTEM /system ; fi
if (! is_mounted /system rw) ; then
rw_my_log "Failed! Can not mount /system rw, aborting!"
exit 1
fi
case "$1" in
ON_POST_FS)
ok_run_now
;;
ON_BOOT_OK)
#ok_run_now
;;
esac
return 0

4. Packing boot.img, then flash to my RockChip TV Box

RESULT: It looks like the script is not executing.

I am not see $TOT output for the log in file: /vendor/etc/my_log/intall.txt

Please help me.

Thanks.