#! /bin/bash

# Copyright (C) 2011 GRNET S.A. 
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.

### BEGIN TASK INFO
# Provides:		FilesystemResizeUnmounted
# RunBefore:		MountImage
# RunAfter:             FixPartitionTable
# Short-Description:	Resize filesystem to use all the available space
### END TASK INFO

set -e
. "@commondir@/common.sh"

trap task_cleanup EXIT
report_task_start
# Check if the task should be prevented from running.
check_if_excluded

if [ ! -b "$SNF_IMAGE_DEV" ]; then
    log_error "Device file:\`${SNF_IMAGE_DEV}' is not a block device"
fi

if [ -z "$SNF_IMAGE_RESIZE_PART" ]; then
    warn "No partition chosen for resize"
    exit 0
fi

if [ -n "$SNF_IMAGE_PROPERTY_DO_SYNC" ]; then
    unset EATMYDATA
fi

if [[ "$SNF_IMAGE_PROPERTY_OSFAMILY" =~ (net)|(open)bsd ]]; then
    os=${SNF_IMAGE_PROPERTY_OSFAMILY^^[bsd]}
    warn "File sytem resizing currently not supported for ${os^?}"
    exit 0
fi

table=$(get_partition_table "$SNF_IMAGE_DEV")
partition=$(get_partition_by_num "$table" "$SNF_IMAGE_RESIZE_PART")
id=$(cut -d: -f1 <<< "$partition")
ptype=$(cut -d: -f5 <<< "$partition")

device="${SNF_IMAGE_DEV}${id}"

if [[ "$ptype" == ext[234] ]]; then
    state=$($TUNE2FS -l "$device" | grep ^Filesystem\ state: | cut -d: -f2);
    state=$(echo $state) #trim the value

    # We force a filesystem resize here if the file system is clean, even if
    # resize2fs complains. By default resize2fs will refuse to resize a file
    # system that has been mounted after the last fs check, but since we are
    # sure the file system is clean it's safe enough to bypass this.
    if [ "$state" = "clean" ]; then
        $EATMYDATA $RESIZE2FS -f "$device"
    else
        log_error "The file system state of partition: \`$device' " \
            " is not clean (state = $state)"
    fi
elif [[ "$ptype" == "freebsd-ufs" ]]; then
    $GROWFS_UFS -y "$device"
else
    warn "Don't know how to resize partition \`$id' with file system \`$ptype'."
fi

exit 0

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