#!/system/bin/sh
### Rozhuk Ivan 2018-2022
### optstart.sh
### 


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


echo "optstart.sh: ${0}: init entware: ${OPT_ROOT_DIR}" > /dev/kmsg


# Check is we need run.
if [ -d /bin ] && [ -d /opt/etc ]; then
	echo "optstart.sh: ${0}: entware already initialized." > /dev/kmsg
	return 0
fi


# Change SeLinux context to magisk, if required and possible.
if [ -r /system/bin/grep ] && [ -r /system/bin/id ] && [ -r /sbin/su ]; then
	if ! /system/bin/id -Z | /system/bin/grep -q 'magisk' ; then
		echo "optstart.sh: ${0}: need to re run ${THIS_SCRIPT_NAME} as root@magisk." > /dev/kmsg
		/sbin/su sh -c "${THIS_SCRIPT_NAME}" > /dev/kmsg 2>&1
		return 0
	else
		echo "optstart.sh: ${0}: running as root@magisk." > /dev/kmsg
	fi
fi


# Prepare rootfs.
# Unprotect.
/system/bin/mount -o rw,remount / > /dev/kmsg 2>&1


# Make /etc
ln -sf /system/etc / > /dev/kmsg 2>&1


# Make /bin and sh.
mkdir -p /bin > /dev/kmsg 2>&1
chmod 0755 /bin > /dev/kmsg 2>&1
ln -s /system/bin/sh /bin/sh > /dev/kmsg 2>&1


# Make /opt.
mkdir -p /opt > /dev/kmsg 2>&1
chmod 0755 /opt > /dev/kmsg 2>&1
/system/bin/mount -o rw,bind "${OPT_ROOT_DIR}" /opt > /dev/kmsg 2>&1
/system/bin/mount -t tmpfs -o rw,nosuid,nodev,size=32m tmpfs /opt/tmp
/system/bin/mount -t tmpfs -o rw,nosuid,nodev,size=8m tmpfs /opt/var/log
/system/bin/mount -t tmpfs -o rw,nosuid,nodev,size=2m tmpfs /opt/var/run


# Protect again.
/system/bin/mount -o ro,remount / > /dev/kmsg 2>&1


# Start services.
unset LD_LIBRARY_PATH
unset LD_PRELOAD
/opt/etc/init.d/rc.unslung start > /dev/kmsg 2>&1


echo "optstart.sh: ${0}: entware init done." > /dev/kmsg


# Workaround: after this process exit init system may kill all child
# zombie processes to cleanup resources. Work forever.
while true; do
        sleep 60000;
done