#!/bin/bash
#    Copyright 2015 Mirantis, Inc.
#
#    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.
#

# Use this script if you want to allocate a new partition.
# Ubuntu and CentOS are not configured the same way by Fuel. CentOS is doing
# RAID 1 with /boot on all disks so we need to deal with that.

# $1 -> The disk (example: "/dev/sdb")
# $2 -> Size of the partition (use all free space if not provided)

set -eux

DISK=$1
DISK_SIZE=${2:-""}

PARTED="$(which parted 2>/dev/null) -s -m"

if ${PARTED} "${DISK}" p | grep -q "unrecognised disk label"; then
    # We need to create a new label
    ${PARTED} "${DISK}" mklabel gpt
fi

# We take the free space at the end of the disk.
FREESPACE=$(${PARTED} "${DISK}" unit B p free | grep "free" | tail -1)
if [[ -z "${FREESPACE}" ]]; then
    echo "Failed to find free space"
    exit 1
fi

BEGIN=$(echo "${FREESPACE}" | awk -F: '{print $2}')
if [ -z "${DISK_SIZE}" ]; then
    END=$(echo "${FREESPACE}" | awk -F: '{print $3}')
else
    END="$(( $(echo "$BEGIN" | rev | cut -c 2- | rev) + $(( DISK_SIZE*1024*1024*1024 )) ))B"
fi

# If you create a partition on a mounted disk, this command returns 1
# So we need a different way to catch the error
if ${PARTED} "${DISK}" unit B mkpart primary "${BEGIN}" "${END}" | grep -q "^Error"; then
    echo "Failed to create a new primary partition"
    exit 1
fi

# Get the ID of the partition and set flags to LVM
# Like when we create a new partition, if you run this command on a mounted
# FS the kernel failed to re-read the partition and the command returns 1
# event in case of success.
PARTID=$(${PARTED} "${DISK}" p | tail -1 | awk -F: '{print $1}')
if ${PARTED} "${DISK}" set "${PARTID}" lvm on | grep -q "^Error"; then
    echo "Failed to set the lvm flag on partition ${PARTID}."
    exit 1
fi