SYSTEM=${1:-/nix/var/nix/profiles/system}

if [[ ! -e "$SYSTEM/kernel" ]]; then
  echo "error: no kernel found at $SYSTEM" >&2
  exit 1
fi

echo "kexec: loading $SYSTEM"
echo "kernel-params: $(cat "$SYSTEM/kernel-params")"

sudo kexec \
  --load "$SYSTEM/kernel" \
  --initrd="$SYSTEM/initrd" \
  --command-line="$(cat "$SYSTEM/kernel-params") init=$SYSTEM/init"

echo "kexec: executing (systemd will stop services first)"
sudo systemctl kexec