#!/system/bin/sh
### Rozhuk Ivan 2020-2021
### setup_autorun_legacy.sh
### 


# Workaround to find 'dirname' on system, at least at /system/xbin - busybox required.
export PATH=/bin:/sbin:/system/bin:/system/xbin
export THIS_SCRIPT_NAME=`readlink -nf ${0}`
export OPT_BIN_DIR=`dirname ${THIS_SCRIPT_NAME}`
export OPT_ROOT_DIR=`dirname "${OPT_BIN_DIR}"`
export OPT_ROOT_PARENT_DIR=`dirname "${OPT_ROOT_DIR}"`
# Restore PATH.
export PATH=${OPT_ROOT_DIR}/bin:${OPT_ROOT_DIR}/sbin:/bin:/sbin:/system/bin:/system/xbin


echo "setup_autorun_legacy.sh: ${0}: setup autorun legacy for entware: ${OPT_ROOT_DIR}"

if [ -z "${OPT_ROOT_DIR}" ] || [ '/opt' == "${OPT_ROOT_DIR}" ]; then
	echo "setup_autorun_legacy.sh: can not use dir: ${OPT_ROOT_DIR}"
	exit 1
fi


# Create service autorun script for magisk.
if [ ! -f /data/adb/service.d/entware.sh ]; then
	echo 'setup_autorun_legacy.sh: creating /data/adb/service.d/entware.sh.'
	mkdir -p /data/adb/service.d
	echo '#!/system/bin/sh' > /data/adb/service.d/entware.sh
	echo '' >> /data/adb/service.d/entware.sh
	echo "echo 'entware.sh: start' > /dev/kmsg" >> /data/adb/service.d/entware.sh
	echo '' >> /data/adb/service.d/entware.sh
	echo "${OPT_BIN_DIR}/optstart.sh > /dev/kmsg 2>&1" >> /data/adb/service.d/entware.sh
	echo '' >> /data/adb/service.d/entware.sh
	chmod 0755 /data/adb/service.d/entware.sh
	chown root:root /data/adb/service.d/entware.sh
	REBOOT_REQUIRED='yes'
fi


# Samsung patch kernel to not allow run programs from /data:
# https://stackoverflow.com/questions/36674727/permission-denied-on-exec-from-a-binary-running-as-root
# https://github.com/termux/termux-packages/issues/3672
# Move magisk`s busybox to /opt and create symlink to override this.
DEV_VENDOR=`grep -E 'ro.product.*brand=' /system/build.prop | tr -d '\n' | sed -e 's|.*[a-z][0-9]\?=||g' | tr '[:lower:]' '[:upper:]'`
if [ 'SAMSUNG' == "${DEV_VENDOR}" ] && [ -f /data/adb/magisk/busybox ] && [ ! -L /data/adb/magisk/busybox ]; then
	echo "setup_autorun_legacy.sh: moving busybox to ${OPT_ROOT_DIR}/magisk/."
	# Unprotect.
	/system/bin/mount -o rw,remount / > /dev/null 2>&1
	/system/bin/mount -o rw,remount "${OPT_ROOT_PARENT_DIR}" > /dev/null 2>&1
	# Do job.
	mkdir -p "${OPT_ROOT_DIR}/magisk"
	cp -f /data/adb/magisk/busybox /data/adb/magisk/busybox.bak
	mv -f /data/adb/magisk/busybox "${OPT_ROOT_DIR}/magisk/"
	ln -sf "${OPT_ROOT_DIR}/magisk/busybox" /data/adb/magisk/
	# Protect again.
	/system/bin/mount -o ro,remount "${OPT_ROOT_PARENT_DIR}" > /dev/null 2>&1
	/system/bin/mount -o ro,remount / > /dev/null 2>&1
	REBOOT_REQUIRED='yes'
fi


# Legacy auto detect, experemental.
#TARGETS=`dmesg | grep "init: cannot find" | sed -e "s|.*cannot find '||" | sed -e "s|', disabling '.*||"`
#for t in $TARGETS;
#do
#	ln -fvs "${OPT_ROOT_DIR}/bin/optstart.sh" "$t"
#done


echo "setup_autorun_legacy.sh: ${0}: setup autorun legacy done."
if [ 'yes' == "${REBOOT_REQUIRED}" ]; then
	echo "setup_autorun_legacy.sh: ${0}: reboot required, 5 seconds..."
	sleep 5
	/system/bin/reboot
fi