#!/bin/sh

set -ex

if [ -z "$part1" ] || [ -z "$part2" ] || [ -z "$part3" ]; then
  printf "Error: missing environment variable part1, part2 or part3\n" 1>&2
  exit 1
fi

mkdir -p /tmp/1 /tmp/2 /tmp/3
   
mount "$part1" /tmp/1
mount "$part2" /tmp/2
mount "$part3" /tmp/3

bootuuid=$(blkid $part1 -o value -s UUID)
sed /tmp/1/cmdline -i -e "s|root=[^ ]*|root=UUID=${bootuuid}|"
  
#sed /tmp/1/cmdline -i -e "s|root=[^ ]*|root=${part2}|"
#sed /tmp/2/etc/fstab -i -e "s|^.* / |${part2}  / |"
#sed /tmp/2/etc/fstab -i -e "s|^.* /boot |${part1}  /boot |"

umount /tmp/1
umount /tmp/2
umount /tmp/3