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#!/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.
resize_filesystem() {
local disk="$1" fs_type=""
if ! fs_type=$(blkid_get_fstype "$disk"); then
echo "$fs_type"
return 1
fi
case "${fs_type}" in
xfs)
echo "XFS filesystems must be mounted to be resized, deferring."
echo "true" > /tmp/xfs_resize
return 1
;;
ext*)
if ! out=$(e2fsck -pf "$disk"); then
echo "Calling e2fsck \"${disk}\" failed: ${out}"
return 1
fi
if ! out=$(resize2fs "$disk"); then
echo "Calling resize2fs \"${disk}\" failed: ${out}"
return 1
fi
;;
*)
echo "Unsupported filesystem type ${fs_type}, unable to expand size."
return 1
;;
esac
}
blkid_get_fstype() (
local root="$1"
if ! out=$(blkid -o udev "$root"); then
echo "Detecting fstype by blkid failed: ${out}"
return 1
fi
eval "$out"
if [ -z "$ID_FS_TYPE" ]; then
echo "No ID_FS_TYPE from blkid."
return 1
fi
echo $ID_FS_TYPE
)
# Checks for and corrects the end-of-disk GPT backup block in case of expanded
# disk.
parted_fix_gpt() {
local disk="$1"
[ -z "$disk" ] && return
if parted -sm "$rootdisk" print 2>&1 | grep "fix the GPT"; then
# Running parted prompts the user to fix this condition, but only does so in
# the interactive exception handler. In order to pass input we must use the
# hidden triple-dash flag and pass both print and Fix arguments. `print`
# alone will not perform the fix, but `Fix` alone will fail the argument
# parser.
parted -m ---pretend-input-tty "$rootdisk" print Fix
if parted -sm "$rootdisk" print 2>&1 | grep "fix the GPT"; then
echo "Failed to fix the GPT."
return 1
fi
fi
}
# Returns "disk:partition", supporting multiple block types.
split_partition() {
local root="$1" disk="" partnum=""
[ -z "$root" ] && return
if [ -e /sys/block/${root##*/} ]; then
echo "Root is not a partition, skipping partition resize."
return 1
fi
disk=${root%%p[0-9]*}
[ "$disk" = "$root" ] && disk=${root%%[0-9]}
partnum=${root#${disk}}
partnum=${partnum#p}
echo "${disk}:${partnum}"
}
# Checks if partition needs resizing.
parted_needresize() {
local disk="$1" partnum="$2" disksize="" partend=""
[ -z "$root" ] && return
if ! out=$(parted -sm "$disk" unit b print 2>&1); then
echo "Failed to get disk details: ${out}"
return 1
fi
if ! echo -e "$out" | sed '$!d' | grep -q "^${partnum}:"; then
echo "Root partition is not final partition on disk. Not resizing."
return 1
fi
disksize=$(echo -e "$out" | grep "^${disk}" | cut -d: -f2)
partend=$(echo -e "$out" | sed '$!d' | cut -d: -f4)
[ -n "$disksize" -a -n "$partend" ] || return 1
disksize=${disksize%%B}
partend=${partend%%B}
# Check if the distance is > .5GB
[ $((disksize-partend)) -gt 536870912 ]
return
}
# Resizes partition using 'resizepart' command.
parted_resizepart() {
local disk="$1" partnum="$2"
[ -z "$disk" -o -z "$partnum" ] && return
if ! out=$(parted -sm "$disk" -- resizepart $partnum -1 2>&1); then
echo "Unable to resize ${disk}${partnum}: ${out}"
return 1
fi
udevadm settle
}
# Resizes partition by deleting and recreating with end position.
# This is a subshell function to safeguard against modifications of IFS.
parted_resize_mkpart() (
local disk="$1" partnum="$2"
[ -z "$disk" -o -z "$partnum" ] && return
local partnum="" partbegin="" partend="" partsize=""
local fstype="" partname="" flags="" temp=""
# $ parted -sm /dev/sda unit b print
# BYT;
# /dev/sda:18253611008B:scsi:512:4096:msdos:Google PersistentDisk:;
# 1:2097152B:18252611583B:18250514432B:ext4::boot;
#
if ! out=$(parted -sm "$disk" unit b print 2>&1); then
echo "Unable to get partition info."
return 1
fi
temp=/tmp/my_temp
echo -e "$out" | sed '$!d' > $temp
IFS=: read partnum partbegin partend partsize fstype partname flags < $temp
rm $temp
if ! out=$(parted -sm "$disk" rm $partnum 2>&1); then
echo "Failed to delete partition: ${out}"
return 1
fi
if ! out=$(parted -sm "$disk" -- mkpart pri $fstype $partbegin -1 2>&1); then
echo "Failed to recreate original partition: ${out}"
echo "Trying to create with original parameters."
if ! out=$(parted -sm "$disk" mkpart pri $fstype $partbegin $partend 2>&1); then
echo "Failed to recreate original partition: ${out}"
return 1
fi
fi
flags=${flags%%;}
IFS=,
for flag in $flags; do
if ! out=$(parted -sm "$disk" set $partnum $flag on 2>&1); then
echo "Failed to set \"$flag\" on ${disk} part ${partnum}: ${out}"
return 1
fi
done
udevadm settle
)
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