Created
January 30, 2015 16:20
-
-
Save theacodes/e086afa7243a0d20db12 to your computer and use it in GitHub Desktop.
Safe format and mount from GCE
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#! /bin/bash | |
# Copyright 2013 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. | |
# Mount a disk, formatting it if necessary. If the disk looks like it may | |
# have been formatted before, we will not format it. | |
# | |
# This script uses blkid and file to search for magic "formatted" bytes | |
# at the beginning of the disk. Furthermore, it attempts to use fsck to | |
# repair the filesystem before formatting it. | |
FSCK=fsck.ext4 | |
MOUNT_OPTIONS="discard,defaults" | |
MKFS="mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 -F" | |
if grep -q '6\..' /etc/redhat-release; then | |
# lazy_journal_init is not recognized in redhat 6 | |
MKFS="mkfs.ext4 -E lazy_itable_init=0 -F" | |
elif grep -q '7\..' /etc/redhat-release; then | |
FSCK=fsck.xfs | |
MKFS=mkfs.xfs | |
fi | |
LOGTAG=safe_format_and_mount | |
LOGFACILITY=user | |
function log() { | |
local readonly severity=$1; shift; | |
logger -t ${LOGTAG} -p ${LOGFACILITY}.${severity} -s "$@" | |
} | |
function log_command() { | |
local readonly log_file=$(mktemp) | |
local readonly retcode | |
log info "Running: $*" | |
$* > ${log_file} 2>&1 | |
retcode=$? | |
# only return the last 1000 lines of the logfile, just in case it's HUGE. | |
tail -1000 ${log_file} | logger -t ${LOGTAG} -p ${LOGFACILITY}.info -s | |
rm -f ${log_file} | |
return ${retcode} | |
} | |
function help() { | |
cat >&2 <<EOF | |
$0 [-f fsck_cmd] [-m mkfs_cmd] [-o mount_opts] <device> <mountpoint> | |
EOF | |
exit 0 | |
} | |
while getopts ":hf:o:m:" opt; do | |
case $opt in | |
h) help;; | |
f) FSCK=$OPTARG;; | |
o) MOUNT_OPTIONS=$OPTARG;; | |
m) MKFS=$OPTARG;; | |
-) break;; | |
\?) log error "Invalid option: -${OPTARG}"; exit 1;; | |
:) log "Option -${OPTARG} requires an argument."; exit 1;; | |
esac | |
done | |
shift $(($OPTIND - 1)) | |
readonly DISK=$1 | |
readonly MOUNTPOINT=$2 | |
[[ -z ${DISK} ]] && help | |
[[ -z ${MOUNTPOINT} ]] && help | |
function disk_looks_unformatted() { | |
blkid ${DISK} | |
if [[ $? == 0 ]]; then | |
return 0 | |
fi | |
local readonly file_type=$(file --special-files ${DISK}) | |
case ${file_type} in | |
*filesystem*) | |
return 0;; | |
esac | |
return 1 | |
} | |
function format_disk() { | |
log_command ${MKFS} ${DISK} | |
} | |
function try_repair_disk() { | |
log_command ${FSCK} -a ${DISK} | |
local readonly fsck_return=$? | |
if [[ ${fsck_return} -ge 8 ]]; then | |
log error "Fsck could not correct errors on ${DISK}" | |
return 1 | |
fi | |
if [[ ${fsck_return} -gt 0 ]]; then | |
log warning "Fsck corrected errors on ${DISK}" | |
fi | |
return 0 | |
} | |
function try_mount() { | |
local mount_retcode | |
try_repair_disk | |
log_command mount -o ${MOUNT_OPTIONS} ${DISK} ${MOUNTPOINT} | |
mount_retcode=$? | |
if [[ ${mount_retcode} == 0 ]]; then | |
return 0 | |
fi | |
# Check to see if it looks like a filesystem before formatting it. | |
disk_looks_unformatted ${DISK} | |
if [[ $? == 0 ]]; then | |
log error "Disk ${DISK} looks formatted but won't mount. Giving up." | |
return ${mount_retcode} | |
fi | |
# The disk looks like it's not been formatted before. | |
format_disk | |
if [[ $? != 0 ]]; then | |
log error "Format of ${DISK} failed." | |
fi | |
log_command mount -o ${MOUNT_OPTIONS} ${DISK} ${MOUNTPOINT} | |
mount_retcode=$? | |
if [[ ${mount_retcode} == 0 ]]; then | |
return 0 | |
fi | |
log error "Tried everything we could, but could not mount ${DISK}." | |
return ${mount_retcode} | |
} | |
try_mount | |
exit $? |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment