#!/usr/bin/bash
#
# Copyright (C) 2022 Red Hat, Inc. All rights reserved.
#
# This file is part of LVM2.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# 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
errorexit() {
echo "$1" >&2
exit 1
}
logmsg() {
echo "$1"
logger "${SCRIPTNAME}: $1"
}
# Set to 1 while the fs is temporarily mounted on $TMPDIR
TMP_MOUNT_DONE=0
# Set to 1 if the fs resize command fails
RESIZEFS_FAILED=0
fsextend() {
if [ "$DO_UNMOUNT" -eq 1 ]; then
logmsg "unmount ${MOUNTDIR}"
if umount "$MOUNTDIR"; then
logmsg "unmount done"
else
logmsg "unmount failed"
exit 1
fi
fi
if [ "$DO_FSCK" -eq 1 ]; then
logmsg "e2fsck ${DEVPATH}"
if e2fsck -f -p "$DEVPATH"; then
logmsg "e2fsck done"
else
logmsg "e2fsck failed"
exit 1
fi
fi
if [ "$DO_CRYPTRESIZE" -eq 1 ]; then
logmsg "cryptsetup resize ${DEVPATH}"
if cryptsetup resize "$DEVPATH"; then
logmsg "cryptsetup done"
else
logmsg "cryptsetup failed"
exit 1
fi
fi
if [ "$DO_MOUNT" -eq 1 ]; then
logmsg "mount ${DEVPATH} ${TMPDIR}"
if mount -t "$FSTYPE" "$DEVPATH" "$TMPDIR"; then
logmsg "mount done"
TMP_MOUNT_DONE=1
else
logmsg "mount failed"
exit 1
fi
fi
if [[ "$FSTYPE" == "ext"* ]]; then
logmsg "resize2fs ${DEVPATH}"
if resize2fs "$DEVPATH"; then
logmsg "resize2fs done"
else
logmsg "resize2fs failed"
RESIZEFS_FAILED=1
fi
elif [[ "$FSTYPE" == "xfs" ]]; then
logmsg "xfs_growfs ${DEVPATH}"
if xfs_growfs "$DEVPATH"; then
logmsg "xfs_growfs done"
else
logmsg "xfs_growfs failed"
RESIZEFS_FAILED=1
fi
fi
# If the fs was temporarily mounted, now unmount it.
if [ $TMP_MOUNT_DONE -eq 1 ]; then
logmsg "cleanup unmount ${TMPDIR}"
if umount "$TMPDIR"; then
logmsg "cleanup unmount done"
TMP_MOUNT_DONE=0
rmdir "$TMPDIR"
else
logmsg "cleanup unmount failed"
exit 1
fi
fi
# If the fs was temporarily unmounted, now remount it.
# Not considered a command failure if this fails.
if [[ $DO_UNMOUNT -eq 1 && $REMOUNT -eq 1 ]]; then
logmsg "remount ${DEVPATH} ${MOUNTDIR}"
if mount -t "$FSTYPE" "$DEVPATH" "$MOUNTDIR"; then
logmsg "remount done"
else
logmsg "remount failed"
fi
fi
if [ $RESIZEFS_FAILED -eq 1 ]; then
logmsg "File system extend failed."
exit 1
fi
exit 0
}
fsreduce() {
if [ "$DO_UNMOUNT" -eq 1 ]; then
logmsg "unmount ${MOUNTDIR}"
if umount "$MOUNTDIR"; then
logmsg "unmount done"
else
logmsg "unmount failed"
exit 1
fi
fi
if [ "$DO_FSCK" -eq 1 ]; then
logmsg "e2fsck ${DEVPATH}"
if e2fsck -f -p "$DEVPATH"; then
logmsg "e2fsck done"
else
logmsg "e2fsck failed"
exit 1
fi
fi
if [ "$DO_MOUNT" -eq 1 ]; then
logmsg "mount ${DEVPATH} ${TMPDIR}"
if mount -t "$FSTYPE" "$DEVPATH" "$TMPDIR"; then
logmsg "mount done"
TMP_MOUNT_DONE=1
else
logmsg "mount failed"
exit 1
fi
fi
if [[ "$FSTYPE" == "ext"* ]]; then
NEWSIZEKB=$(( NEWSIZEBYTES / 1024 ))
logmsg "resize2fs ${DEVPATH} ${NEWSIZEKB}k"
if resize2fs "$DEVPATH" "$NEWSIZEKB"k; then
logmsg "resize2fs done"
else
logmsg "resize2fs failed"
# will exit after cleanup unmount
RESIZEFS_FAILED=1
fi
fi
# If the fs was temporarily mounted, now unmount it.
if [ $TMP_MOUNT_DONE -eq 1 ]; then
logmsg "cleanup unmount ${TMPDIR}"
if umount "$TMPDIR"; then
logmsg "cleanup unmount done"
TMP_MOUNT_DONE=0
rmdir "$TMPDIR"
else
logmsg "cleanup unmount failed"
exit 1
fi
fi
if [ $RESIZEFS_FAILED -eq 1 ]; then
logmsg "File system reduce failed."
exit 1
fi
if [ "$DO_CRYPTRESIZE" -eq 1 ]; then
NEWSIZESECTORS=$(( NEWSIZEBYTES / 512 ))
logmsg "cryptsetup resize ${NEWSIZESECTORS} sectors ${DEVPATH}"
if cryptsetup resize --size "$NEWSIZESECTORS" "$DEVPATH"; then
logmsg "cryptsetup done"
else
logmsg "cryptsetup failed"
exit 1
fi
fi
# If the fs was temporarily unmounted, now remount it.
# Not considered a command failure if this fails.
if [[ $DO_UNMOUNT -eq 1 && $REMOUNT -eq 1 ]]; then
logmsg "remount ${DEVPATH} ${MOUNTDIR}"
if mount -t "$FSTYPE" "$DEVPATH" "$MOUNTDIR"; then
logmsg "remount done"
else
logmsg "remount failed"
fi
fi
exit 0
}
cryptresize() {
NEWSIZESECTORS=$(( NEWSIZEBYTES / 512 ))
logmsg "cryptsetup resize ${NEWSIZESECTORS} sectors ${DEVPATH}"
if cryptsetup resize --size "$NEWSIZESECTORS" "$DEVPATH"; then
logmsg "cryptsetup done"
else
logmsg "cryptsetup failed"
exit 1
fi
exit 0
}
usage() {
echo "${SCRIPTNAME}: helper script called by lvresize to resize file systems."
echo ""
echo "${SCRIPTNAME} --fsextend --fstype name --lvpath path"
echo " [ --mountdir path ]"
echo " [ --mount ]"
echo " [ --unmount ]"
echo " [ --remount ]"
echo " [ --fsck ]"
echo " [ --cryptresize ]"
echo " [ --cryptpath path ]"
echo ""
echo "${SCRIPTNAME} --fsreduce --fstype name --lvpath path"
echo " [ --newsizebytes num ]"
echo " [ --mountdir path ]"
echo " [ --mount ]"
echo " [ --unmount ]"
echo " [ --remount ]"
echo " [ --fsck ]"
echo " [ --cryptresize ]"
echo " [ --cryptpath path ]"
echo ""
echo "${SCRIPTNAME} --cryptresize --cryptpath path --newsizebytes num"
echo ""
echo "Options:"
echo " --fsextend"
echo " Extend the file system."
echo " --fsreduce"
echo " Reduce the file system."
echo " --fstype name"
echo " The type of file system (ext*, xfs)."
echo " --lvpath path"
echo " The path to the LV being resized."
echo " --mountdir path"
echo " The file system is currently mounted here."
echo " --mount"
echo " Mount the file system on a temporary directory before resizing."
echo " --unmount"
echo " Unmount the file system before resizing."
echo " --remount"
echo " Remount the file system after resizing if unmounted."
echo " --fsck"
echo " Run fsck on the file system before resizing (only with ext*)."
echo " --newsizebytes num"
echo " The new size of the file system."
echo " --cryptresize"
echo " Resize the crypt device between the LV and file system."
echo " --cryptpath path"
echo " The path to the crypt device."
echo ""
}
#
# BEGIN SCRIPT
#
PATH="/sbin:/usr/sbin:/bin:/usr/sbin:$PATH"
SCRIPTNAME=$(basename "$0")
# These are the only commands that this script will run.
# Each is enabled (1) by the corresponding command options:
# --fsextend, --fsreduce, --cryptresize, --mount, --unmount, --fsck
DO_FSEXTEND=0
DO_FSREDUCE=0
DO_CRYPTRESIZE=0
DO_MOUNT=0
DO_UNMOUNT=0
DO_FSCK=0
# --remount: attempt to remount the fs if it was originally
# mounted and the script unmounted it.
REMOUNT=0
if [ "$UID" != 0 ] && [ "$EUID" != 0 ]; then
errorexit "${SCRIPTNAME} must be run as root."
fi
GETOPT="getopt"
OPTIONS=$("$GETOPT" -o h -l help,fsextend,fsreduce,cryptresize,mount,unmount,remount,fsck,fstype:,lvpath:,newsizebytes:,mountdir:,cryptpath: -n "${SCRIPTNAME}" -- "$@")
eval set -- "$OPTIONS"
while true
do
case $1 in
--fsextend)
DO_FSEXTEND=1
shift
;;
--fsreduce)
DO_FSREDUCE=1
shift
;;
--cryptresize)
DO_CRYPTRESIZE=1
shift
;;
--mount)
DO_MOUNT=1
shift
;;
--unmount)
DO_UNMOUNT=1
shift
;;
--fsck)
DO_FSCK=1
shift
;;
--remount)
REMOUNT=1
shift
;;
--fstype)
FSTYPE=$2;
shift; shift
;;
--lvpath)
LVPATH=$2;
shift; shift
;;
--newsizebytes)
NEWSIZEBYTES=$2;
shift; shift
;;
--mountdir)
MOUNTDIR=$2;
shift; shift
;;
--cryptpath)
CRYPTPATH=$2;
shift; shift
;;
-h|--help)
usage
shift
exit 0
;;
--)
shift
break
;;
*)
errorexit "Unknown option \"$1\."
exit 1
;;
esac
done
#
# Input arg checking
#
# There are three top level commands: --fsextend, --fsreduce, --cryptresize.
if [[ "$DO_FSEXTEND" -eq 0 && "$DO_FSREDUCE" -eq 0 && "$DO_CRYPTRESIZE" -eq 0 ]]; then
errorexit "Missing --fsextend|--fsreduce|--cryptresize."
fi
if [[ "$DO_FSEXTEND" -eq 1 || "$DO_FSREDUCE" -eq 1 ]]; then
case "$FSTYPE" in
ext[234]) ;;
"xfs") ;;
*) errorexit "Cannot resize --fstype \"$FSTYPE\"."
esac
if [ -z "$LVPATH" ]; then
errorexit "Missing required --lvpath."
fi
fi
if [[ "$DO_CRYPTRESIZE" -eq 1 && -z "$CRYPTPATH" ]]; then
errorexit "Missing required --cryptpath for --cryptresize."
fi
if [ "$DO_CRYPTRESIZE" -eq 1 ]; then
DEVPATH=$CRYPTPATH
else
DEVPATH=$LVPATH
fi
if [ -z "$DEVPATH" ]; then
errorexit "Missing path to device."
fi
if [ ! -e "$DEVPATH" ]; then
errorexit "Device does not exist \"$DEVPATH\"."
fi
if [[ "$DO_UNMOUNT" -eq 1 && -z "$MOUNTDIR" ]]; then
errorexit "Missing required --mountdir for --unmount."
fi
if [[ "$DO_FSREDUCE" -eq 1 && "$FSTYPE" == "xfs" ]]; then
errorexit "Cannot reduce xfs."
fi
if [[ "$DO_FSCK" -eq 1 && "$FSTYPE" == "xfs" ]]; then
errorexit "Cannot use --fsck with xfs."
fi
if [ "$DO_MOUNT" -eq 1 ]; then
TMPDIR=$(mktemp --suffix _lvresize_$$ -d -p /tmp)
if [ ! -e "$TMPDIR" ]; then
errorexit "Failed to create temp dir."
fi
# In case the script terminates without doing cleanup
function finish {
if [ "$TMP_MOUNT_DONE" -eq 1 ]; then
logmsg "exit unmount ${TMPDIR}"
umount "$TMPDIR"
rmdir "$TMPDIR"
fi
}
trap finish EXIT
fi
#
# Main program function:
# - the two main functions are fsextend and fsreduce.
# - one special case function is cryptresize.
#
if [ "$DO_FSEXTEND" -eq 1 ]; then
fsextend
elif [ "$DO_FSREDUCE" -eq 1 ]; then
fsreduce
elif [ "$DO_CRYPTRESIZE" -eq 1 ]; then
cryptresize
fi
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