#!/bin/busybox sh

rescue_shell() {
	printf '\e[1;31m' # bold red foreground
	printf "$1 Dropping you to a shell."
	printf "\e[00m\n" # normal colour foreground
	# load the keymap
	[ -f /keymap ] && loadkmap < /keymap
	exec setsid cttyhack /bin/sh
}

# initialise
mount -t proc none /proc || rescue_shell "mount /proc failed."
mount -t sysfs none /sys || rescue_shell "mount /sys failed."
mount -t devtmpfs none /dev || rescue_shell "mount /dev failed."

# set hardcoded default values
crypt_root=""
root=""
resume=""
mount_ro_rw='ro'

# parse kernel command line
for p in $(cat /proc/cmdline); do
	case "${p}" in
#		crypt_root=*)
#			crypt_root="${p#*=}"
#			;;
		root=*)
			root="${p#*=}"
			;;
		resume=*)
			resume="${p#*=}"
			;;
		ro|rw)
			mount_ro_rw="${p}"
			;;
	esac
done


# # decrypt
# #  convert UUID or LABEL to device node
# crypt_root="$(findfs "${crypt_root}")"
# #  decryption is first tried using the key file /crypto_key.bin
# #  if this fails, prompt for a password
# cryptsetup open "${crypt_root}" lvm --type luks --key-file /crypto_key.bin || \
# 	cryptsetup open "${crypt_root}" lvm --type luks || \
# 	rescue_shell "Decryption failed."

# activate lvm
#  create /dev/mapper/control
lvm vgscan --mknodes || rescue_shell "vgscan failed."
#  activate all LVM volumes
lvm vgchange --sysinit -a ly || rescure_shell "vgchange failed."
#  create device nodes for the volumes
lvm vgscan --mknodes || rescue_shell "vgscan failed."

# mount the real root
#  convert UUID or LABEL to device node
root="$(findfs "${root}")"
mount -o "${mount_ro_rw}" "${root}" /mnt/root || rescue_shell "mount ${root} failed."

# enable resume from hibernate
if [ -n "${resume}" ]; then
	# copy the major:minor of the swap block device into /sys/power/resume
	printf '%u:%u\n' $(stat -L -c '0x%t 0x%T' "${resume}") > /sys/power/resume || \
		rescue_shell "Activating resume failed."
fi

# clean up
umount /proc
umount /sys
umount /dev

# boot the real system
exec switch_root /mnt/root /sbin/init