#! /bin/bash
# support for GRUB version 2

error=0; trap 'error=$(($?>$error?$?:$error))' ERR # save maximum error code

set -x
set -a

# do not set up grub during dirinstall
if [ "$FAI_ACTION" = "dirinstall" ] ; then
    exit 0
fi
# during softupdate use this file
[ -r $LOGDIR/disk_var.sh ] && . $LOGDIR/disk_var.sh

if [ -z "$BOOT_DEVICE" ]; then
    exit 189
fi

# disable os-prober because of #802717
ainsl /etc/default/grub 'GRUB_DISABLE_OS_PROBER=true'

# skip the rest, if not an initial installation
if [ $FAI_ACTION != "install" ]; then
    $ROOTCMD update-grub
    exit $error
fi

get_stable_devname() {

    local _DEV="$1"
    local i
    declare -a _RES

    # prefer SCSI over ATA over WWN over path
    # do not use by-path

    for i in $($ROOTCMD udevadm info -r --query=symlink "$_DEV"); do
        if [[ "$i" =~ /by-id/scsi ]]; then
            _RES[10]="$i"
        elif [[ "$i" =~ /by-id/ata ]]; then
            _RES[20]="$i"
        elif [[ "$i" =~ /by-id/wwn ]]; then
            _RES[99]="$i"
        fi
    done

    echo "${_RES[@]::1}"
}

# handle /boot in lvm-on-md
_bdev=$(readlink -f $BOOT_DEVICE)
if [ "${_bdev%%-*}" = "/dev/dm" ]; then
  BOOT_DEVICE=$( lvs --noheadings -o devices $BOOT_DEVICE | sed -e 's/^*\([^(]*\)(.*$/\1/' )
fi

# Check if RAID is used for the boot device
if [[ $BOOT_DEVICE =~ '/dev/md' ]]; then
    GROOT=$($ROOTCMD grub-probe -tdrive -d $BOOT_DEVICE)
    raiddev=${BOOT_DEVICE#/dev/}
    # install grub on all members of RAID
    for device in $(LC_ALL=C perl -ne 'if(/^'$raiddev'\s.+raid\d+\s(.+)/){ $_=$1; s/\d+\[\d+\]//g; s/(nvme.+?)p/$1/g; print }' /proc/mdstat); do
	pdevice=$(get_stable_devname /dev/$device)
	if [ -z "$pdevice" ]; then
	    # if we cannot find a persistent name (for e.g. in a VM) use old name
	    pdevice="/dev/$device"
	fi
	mbrdevices+="$pdevice, "
	echo Installing grub on /dev/$device = $pdevice
	$ROOTCMD grub-install --no-floppy "/dev/$device"
    done
    # remove last ,
    mbrdevices=${mbrdevices%, }
else
  for dev in $BOOT_DEVICE; do
    mbrdevices=$(get_stable_devname $dev)
    if [ -z "$mbrdevices" ]; then
      # if we cannot find a persistent name (for e.g. in a VM) use old name
      mbrdevices=$dev
    fi
    echo "Installing grub on $dev = $mbrdevices"
    $ROOTCMD grub-install --no-floppy "$mbrdevices"
  done
fi

echo "grub-pc grub-pc/install_devices multiselect $mbrdevices" | $ROOTCMD debconf-set-selections
$ROOTCMD dpkg-reconfigure grub-pc
exit $error