#!/bin/sh
set -e

. /usr/share/debconf/confmodule

db_capb backup

log() {
	logger -t elilo-installer "$@"
}

error() {
	log "error: $@"
}

info() {
    log "info: $@"
}

if [ -f /etc/mtab ]; then
    MTAB=/etc/mtab
else
    MTAB=/proc/mounts
fi

# detect which is the root partition: /target
rootfs=`grep ' /target ' $MTAB |cut -d' ' -f1 -s`

# Find all partitions with fat filesystems and the boot flag set.  May be
# enough just to look for one of those.  OTOH, elilo will convert any
# partition you give it to FAT...  Also translates /dev/discs paths in to
# real /dev/scsi (or ide) paths.

rm -f /tmp/efi_boot.list

/usr/lib/partconf/find-partitions --flag boot | while read part fs size; do
    case $fs in
	fat16|fat32)
	    echo "$part" >> /tmp/efi_boot.list
	    ;;
    esac
done
bootpart_priority=medium
default_bootpart=
if [ -s /tmp/efi_boot.list ]; then
    for d in `cat /tmp/efi_boot.list`; do
	d=`mapdevfs $d`
	if [ -n "$BOOTPARTS" ]; then
	    BOOTPARTS="$BOOTPARTS, $d"
	    bootpart_priority=critical
	else
	    default_bootpart=$d
	    BOOTPARTS=$d
	fi
    done
else
	db_capb
	db_input critical elilo-installer/no-bootpart
	db_go || true
	exit 1
fi
rm -f /tmp/efi_boot.list
db_subst elilo-installer/bootpart BOOTPARTS $BOOTPARTS
db_fget elilo-installer/bootpart seen
if [ "$RET" = false ]; then
    db_set elilo-installer/bootpart "$default_bootpart"
fi

db_input "$bootpart_priority" elilo-installer/bootpart || true
db_go || exit 10

db_get elilo-installer/bootpart
bootpart=$RET
rootfs=`mapdevfs $rootfs`

# Write out elilo.conf

# TODO: this template doesn't have the right text; need a different template
# for the progress bar title.
db_progress START 0 2 debian-installer/elilo-installer/title

db_progress INFO elilo-installer/progress_installing

if ! apt-install elilo ; then
	info "Calling 'apt-install elilo' failed"
	# Hm, unable to install elilo into /target/, what should we do?
	db_input critical elilo-installer/apt-install-failed || [ $? -eq 30 ]
	if ! db_go; then
		db_progress STOP
		exit 10 # back up to menu
	fi
	db_get elilo-installer/apt-install-failed
	if [ true != "$RET" ] ; then
		db_progress STOP
		exit 1
	fi
fi

db_progress STEP 1

db_subst elilo-installer/progress_running bootdev "$bootpart"
db_progress INFO elilo-installer/progress_running

## efibootmgr, which is called by elilo, needs this
if [ ! -f /proc/efivars ] && [ ! -d /sys/firmware/efi/vars ] ; then
  if ! modprobe efivars ; then
    log "Couldn't load efivars module - is it statically linked?"
  fi
fi

## efi variables (needed by efibootmgr) are exported via proc in 2.4,
## or via sysfs in 2.6.  Make sure sysfs is mounted if it needs to be.
## We should probably also make sure proc is mounted, since whatever is
## mounting /proc today may not always do so in the future.
sysmount=0

if grep -q sysfs /proc/filesystems ; then
  if [ ! -d /target/sys ] ; then
    error "/target/sys does not exist"
  fi
  ## check to see if sysfs is already mounted in the target
  if ! grep '^sysfs ' /proc/mounts | cut -d' ' -f2 | grep -q '^/target/sys$' ; then
    if mount sysfs /target/sys -t sysfs ; then
      sysmount=1
    else
      log "Couldn't mount sysfs, continuing in case its not needed"
    fi
  fi
fi

errcode=0
chroot /target /usr/sbin/elilo --autoconf --boot $bootpart \
      --root $rootfs --efiboot || errcode=$?

## umount sysfs if we mounted it above
if [ $sysmount -eq 1 ]; then
  if ! umount /target/sys; then
    log "Couldn't umount sysfs, continuing in case that's ok"
  fi
fi

if [ "$errcode" = 0 ] ; then
	info "Boot loader successfully installed into EFI partition"
else
	db_subst elilo-installer/failed ERRCODE "$errcode"
	db_input critical elilo-installer/failed || [ $? -eq 30 ]
	db_progress STOP
	db_go || exit 10 # back up
	exit 1
fi

db_progress STEP 1

db_progress STOP

sed 's/do_bootloader = no/do_bootloader = yes/' < /target/etc/kernel-img.conf > /target/etc/kernel-img.conf.$$
mv /target/etc/kernel-img.conf.$$ /target/etc/kernel-img.conf

exit 0