#!/bin/bash

# Configure grub. Note that the various conditionals here are to handle
# different distributions gracefully.

set -e

# XXX: grub-probe on the nbd0 device returns nothing - workaround, manually
# specify modules. https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1073731
GRUBNAME=`which grub-install` || echo "trying grub2-install"
if [ -z "$GRUBNAME" ]; then
    GRUBNAME=`which grub2-install`
fi
if [ -z "$GRUBNAME" ]; then
    echo "NO grub-install or grub2-install found"
    exit 1
fi
BOOT_DEV=/dev/nbd0
PART_DEV=/dev/nbd0p1
$GRUBNAME --modules="biosdisk part_msdos" $BOOT_DEV
# This might be better factored out into a per-distro 'install-bootblock'
# helper.
if [ -f "/boot/grub/grub.cfg" ] ; then
  GRUB_CFG=/boot/grub/grub.cfg
elif [ -f "/boot/grub2/grub.cfg" ] ; then
  GRUB_CFG=/boot/grub2/grub.cfg
fi
# grub-mkconfig generates a config with the device in it,
# force use of a LABEL:
# NOTE: Updating the grub config by hand once deployed should work, its just
# prepping it in a different environment that needs fiddling.
sed -i "s%$PART_DEV%LABEL=cloudimg-rootfs%" $GRUB_CFG