#!/bin/sh
# Copyright 2018 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

PREREQ=""
prereqs()
{
  echo "$PREREQ"
}
case $1 in
  prereqs)
    prereqs
    exit 0
    ;;
esac

. /scripts/functions
. /local-premount/expandfs-lib.sh

if ! rootdev=$(resolve_device "${ROOT}"); then
  log_failure_message "Failed to resolve root device for \"${ROOT}\""
fi

if ! fs_type=$(get_fstype "${rootdev}"); then
  log_failure_message "Failed to determine fstype for \"${rootdev}\""
fi

if ! out=$(get_partition "$rootdev"); then
  echo "Failed to detect disk and partition info: ${out}"
  exit 0
fi

disk=${out%:*}
partnum=${out#*:}

if ! parted_needresize "$rootdisk" "$partnum"; then
  exit 0
fi

echo "Resizing disk ${rootdev}"

if ! out=$(parted_fix_gpt); then
  echo "$out"
  exit 0
fi

if parted --help | grep -q 'resizepart'; then
  if ! out=$(parted_resizepart "$disk" "$partnum"); then
    echo "Failed to resize partition: ${out}"
    exit 0
  fi
else
  echo "No 'resizepart' command in this parted, trying rm&&mkpart"
  if ! out=$(parted_resize_mkpart "$disk" "$partnum"); then
    echo "Failed to resize partition: ${out}"
    exit 0
  fi
fi
