init_prelinux

#! /bin/sh

MBR_DISK=/dev/sda
BOOT_PARTITION=/dev/sda1
REAL_PARTITION=/dev/sda3

export PATH=/bin:/sbin:/usr/bin:/usr/sbin

mount -n -t proc -o nosuid,noexec,nodev proc /proc
mount -n -t sysfs -o nosuid,noexec,nodev sysfs /sys
mount -n -t tmpfs -o nosuid,mode=0755 dev /dev

smdev -s
echo "/usr/bin/smdev" > /proc/sys/kernel/hotplug

# dd needs these
# ideally smdev would do this for us
ln -s /proc/self/fd/0 /dev/stdin
ln -s /proc/self/fd/1 /dev/stdout
ln -s /proc/self/fd/2 /dev/stderr

# load checksums, assume this defines $GOOD_MBR and $GOOD_BOOT
. /shasums.sh

MBR=`dd if=$MBR_DISK bs=512 count=1 quiet | sha256sum`
if [[ "$GOOD_MBR" == "$MBR" ]]; then
        echo "MBR looks fine"
else
        echo "fuck fuck fuck fuck fuck"
fi

BOOT=`dd if=$BOOT_PARTITION bs=8192 count=2048 quiet | sha256sum`
if [[ "$GOOD_BOOT" == "$BOOT" ]]; then
        echo "/boot looks fine"
else
        echo "shit shit shit shit shit"
fi

# mount another LUKS partition
cryptsetup luksOpen $REAL_PARTITION real
mkdir -p /new_root
mount -t ext4 /dev/mapper/real /new_root

echo > /proc/sys/kernel/hotplug

umount /sys
umount /proc
umount /dev

# pivot into it
mkdir -p /new_root/pivot
cd /new_root
pivot_root . pivot

# hand off to a real init
exec /sbin/init