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#!/bin/sh
# Copyright 2018 Google Inc. All Rights Reserved.
#
# 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, version 3 of the License.
#
# 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, see <https://www.gnu.org/licenses/>.
# Expands a filesystem and its corresponding partition (if it exists) to fill
# all available disk space. Takes as an argument the mountpoint or device to
# expand, with any specification supported by findmnt.
[ $# -ne 1 ] && { echo "Usage: $0 device|mountpoint"; exit 1; }
# Find the device to expand.
if [ -b "$1" ]; then
dev="$1"
else
dev="$(findmnt -nfvo SOURCE -- "$1")"
[ -b "$dev" ] || { echo "Cannot find device for '$1'"; exit 1; }
fi
# If it's a partition, expand that first using growpart.
if [ "$(lsblk -ndo TYPE -- "$dev")" = part ]; then
disk="$(lsblk -ndpo PKNAME -- "$dev")"
partnum="${dev##*[!0-9]}"
growpart "$disk" "$partnum" || { [ $? -ne 1 ] && exit 1; }
fi
# Expand the filesystem.
fs="$(lsblk -ndo FSTYPE -- "$dev")"
mnt="$(lsblk -ndo MOUNTPOINT -- "$dev")"
case "$fs" in
btrfs) btrfs filesystem resize max "$mnt" || exit 1 ;;
ext[2-4]) resize2fs -- "$dev" || exit 1 ;;
xfs) xfs_growfs "$mnt" || exit 1 ;;
*) echo "Unsupported filesystem type '$fs'"; exit 1 ;;
esac
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