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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.
# Contains dracut-specific logic for detecting disk, then calls appropriate
# library functions.
# Notes for developing dracut modules: this module must never exit with anything
# other than a 0 exit code. That means no use of set -e or traps on err, and
# every command must be defensively written so that errors are caught and
# logged, rather than causing end of execution. Note that error handling in the
# main() function always calls return 0
main() {
local rootdev="" disk="" partnum=""
# Remove 'block:' prefix and find the root device.
if ! rootdev=$(readlink -f "${root#block:}") || [ -z "${rootdev}" ]; then
kmsg "Unable to find root device."
return
fi
if ! out=$(split_partition "$rootdev"); then
kmsg "Failed to detect disk and partition info: ${out}"
return
fi
disk=${out%:*}
partnum=${out#*:}
(
# If we can't obtain an exclusive lock on FD 9 (which is associated in this
# subshell with the root device we're modifying), then exit. This is needed
# to prevent systemd from issuing udev re-enumerations and fsck calls before
# we're done. See https://systemd.io/BLOCK_DEVICE_LOCKING/
if ! flock -n 9; then
kmsg "couldn't obtain lock on ${rootdev}"
exit
fi
if ! parted_needresize "$disk" "$partnum"; then
kmsg "Disk ${rootdev} doesn't need resizing"
exit
fi
if ! parted --help | grep -q 'resizepart'; then
kmsg "No 'resizepart' command in this parted"
exit
fi
kmsg "Resizing disk ${rootdev}"
# First, move the secondary GPT to the end.
if ! out=$(sgdisk_fix_gpt "$disk"); then
kmsg "Failed to fix GPT: ${out}"
fi
if ! out=$(parted_resizepart "$disk" "$partnum"); then
kmsg "Failed to resize partition: ${out}"
exit
fi
if ! out=$(resize_filesystem "$rootdev"); then
kmsg "Failed to resize filesystem: ${out}"
exit
fi
) 9<$rootdev
}
. /lib/expandfs-lib.sh
udevadm settle
main
udevadm settle
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