#!/bin/bash

# source in the functions
source /opt/vyatta/sbin/install-functions

# export INSTALL_LOG for the scripts invoked
export INSTALL_LOG=/tmp/install-$$.log

# file for get-partition output
PART_FILE=''

fail_exit ()
{
  echo "$*"
  echo 'Exiting...'
  exit 1
}

clean_up ()
{
  if [ -n "$PART_FILE" ]; then
    rm -f $PART_FILE >&/dev/null
  fi
  umount $CD_SQUASH_ROOT >&/dev/null || true
  umount $CD_ROOT >&/dev/null || true
  umount $INST_ROOT >&/dev/null || true
  umount $READ_ROOT >&/dev/null || true
  umount $WRITE_ROOT >&/dev/null || true
}

sig_handler () {
  echo "ERROR: Signal received. Exiting..."
  clean_up
  echo "Done"
  trap - EXIT
  exit 1
}

exit_handler () {
  clean_up
}

# set up the specified ISO image for install
set_up_new_iso ()
{
  if [ ! -f "$NEW_ISO" ] || ! (file $NEW_ISO | grep -q 9660); then
    fail_exit "\"$NEW_ISO\" is not a valid ISO image file."
  fi

  # make sure mount points exist
  mkdir -p $INST_ROOT $WRITE_ROOT $READ_ROOT $CD_ROOT $CD_SQUASH_ROOT 

  # mount ISO
  margs="-o loop,ro $NEW_ISO $CD_ROOT"
  if ! try_mount "$margs"; then
    fail_exit 'Failed to mount the new image.'
  fi

  # check squash image
  local squash_file=$CD_ROOT/live/filesystem.squashfs
  if [ ! -f "$squash_file" ] || ! (file $squash_file | grep -q Squashfs) \
      || ! grep -q '^ii  vyatta-version ' $CD_ROOT/live/packages.txt; then
    fail_exit "\"$NEW_ISO\" is not a Vyatta ISO image file."
  fi

  # mount squash image
  margs="-o loop,ro $squash_file $CD_SQUASH_ROOT"
  if ! try_mount "$margs"; then
    fail_exit 'Failed to mount the squashfs image.'
  fi
}

# install new image into a newly-formatted partition.
# will exit with error if installation fails.
install_new ()
{
  local root_part=$1
  local inst_drv=$2

  if [ ! -e "/dev/$root_part" ] || [ ! -e "/dev/$inst_drv" ]; then
    fail_exit "Invalid drive/partition ($inst_drv and $root_part)."
  fi

  # install new image
  if ! /opt/vyatta/sbin/install-image-new "$root_part"; then
    exit 1
  fi

  # postinst operations
  if ! /opt/vyatta/sbin/install-postinst-new \
         "$inst_drv" "$root_part" union; then
    exit 1
  fi
}

# install new image into the current boot partition.
# will exit with error if installation fails.
install_existing ()
{
  local ctype=$1
  if ! /opt/vyatta/sbin/install-image-existing "$ctype"; then
    exit 1
  fi
}

# the image to be installed. only used if installing from an installed,
# running system.
NEW_ISO=$1

if [ `whoami` != 'root' ] ; then
  fail_exit 'This script must be run with root privileges.'
fi

trap sig_handler INT KILL
trap exit_handler EXIT

if is_live_cd_boot; then
  if [ -n "$NEW_ISO" ]; then
    fail_exit 'Do not specify an image when installing from a live CD.'
  fi
elif [ -z "$NEW_ISO" ]; then
  fail_exit 'Must specify an image to install.'
else
  # installing on an installed system. set up the new image.
  set_up_new_iso
fi

# check versions
if is_live_cd_boot; then
  CURVER=LIVECD
else
  CURVER=$(get_cur_version)
fi
NEWVER=$(get_new_version)
if [ -z "$CURVER" ] || [ -z "$NEWVER" ]; then
  fail_exit 'Cannot find release version.'
fi
if [ "$CURVER" == "$NEWVER" ]; then
  fail_exit "Version \"$NEWVER\" is already installed."
fi

# get install partition
PART_FILE=$(mktemp /tmp/inst-get-part.XXXXXX) \
  || fail_exit 'Failed to create temporary file'
if ! /opt/vyatta/sbin/install-get-partition $PART_FILE; then
  exit 1
fi

# get the partition params
root_part_type=''
root_part=''
inst_drv=''
eval "read root_part_type root_part inst_drv <$PART_FILE" >&/dev/null
rm -f $PART_FILE >&/dev/null

# handle different types
case "$root_part_type" in
  new)
    install_new "$root_part" "$inst_drv"
    exit 0
    ;;
  union|old)
    install_existing "$root_part_type"
    exit 0
    ;;
  *)
    fail_exit "Unknown partition type \"$root_part_type\"."
    ;;
esac