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#!/bin/sh
PATH=/sbin:/bin:/usr/sbin:/usr/bin
RDEV=""
ROOT_DIR="/new_root"
mkdir -p /proc
mkdir -p /sys
mkdir -p /run
mkdir -p /tmp
mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -t devtmpfs none /dev
udevd --daemon
udevadm trigger --type=subsystems --action=add
udevadm trigger --type=devices --action=add
udevadm settle --timeout=10
for PARAM in $(cat /proc/cmdline); do
case $PARAM in
root=*)
RDEV=${PARAM#root=}
;;
esac
done
if ! [ -b $RDEV ]; then
echo "Missing root command line argument!"
exit 1
fi
case $RDEV in
UUID=*)
RDEV=$(realpath /dev/disk/by-uuid/${RDEV#UUID=})
;;
esac
. /usr/share/dm-verity.env
echo "Mounting $RDEV over dm-verity as the root filesystem"
veritysetup --data-block-size=1024 --hash-offset=$DATA_SIZE create rootfs $RDEV $RDEV $ROOT_HASH
mkdir -p $ROOT_DIR
mount -o ro /dev/mapper/rootfs $ROOT_DIR
exec switch_root $ROOT_DIR /sbin/init
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