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#!/bin/bash
# Author: JuanJo Ciarlante <jjo@canonical.com>
# Copyright: Canonical Ltd. 2012
# License: GPLv2
#
# juju storage common shell library
#
#------------------------------
# Returns a mount point from passed vol-id, e.g. /srv/juju/vol-000012345
#
# @param $1 volume id
# @echoes mntpoint-path eg /srv/juju/vol-000012345
#------------------------------
_mntpoint_from_volid() {
local volid=${1?missing volid}
[[ ${volid} != "" ]] && echo /srv/juju/${volid} || echo ""
}
#------------------------------
# Assert that passed mount points hold different filesystems
#
# @param $1 mntpoint1
# @param $2 mntpoint2
# @return 0 different FS
# 1 same FS
#------------------------------
_assert_diff_fs() {
local mnt1="${1:?missing mntpoint1}"
local mnt2="${2:?missing mntpoint2}"
local fsid1 fsid2
fsid1=$(stat --file-system -c '%i' "${mnt1}" 2>/dev/null)
fsid2=$(stat --file-system -c '%i' "${mnt2}" 2>/dev/null)
[[ ${fsid1} != ${fsid2} ]]
return $?
}
#------------------------------
# Initialize volume (sfdisk, mkfs.ext4) IFF NOT already, mount it at
# /srv/juju/<volume-id>
#
# @param $1 volume-id, can be any arbitrary string, better if
# equal to EC2/OS vol-id name (just for consistency)
# @return 0 success
# 1 nil volid/etc
# 2 error while handling the device (non-block device, sfdisk error, etc)
#------------------------------
volume_init_and_mount() {
## Find 1st unused device (reverse sort /dev/vdX)
local volid=${1:?missing volid}
local dev_regexp
local dev found_dev=
local label="${volid}"
local func=${FUNCNAME[0]}
dev_regexp=$(config-get volume-dev-regexp) || return 1
mntpoint=$(_mntpoint_from_volid ${volid})
[[ -z ${mntpoint} ]] && return 1
if mount | egrep -qw "${mntpoint}";then
_assert_diff_fs "/" "${mntpoint}" || {
juju-log "ERROR: returning from ${func} with '${mntpoint}' still at '/' filesystem"
return 1
}
juju-log "NOTICE: mntpoint=${mntpoint} already mounted, skipping volume_init_and_mount"
return 0
fi
# Sanitize
case "${dev_regexp?}" in
# Careful: this is glob matching against an regexp -
# quite narrowed
/dev/*|/dev/disk/by-*)
;; ## Ok
*)
juju-log "ERROR: invalid 'volume-dev-regexp' specified"
return 1
;;
esac
# Assume udev will create only existing devices
for dev in $(ls -rd1 /dev/* | egrep "${dev_regexp}" | egrep -v "[1-9]$" 2>/dev/null);do
## Check it's not already mounted
mount | egrep -q "${dev}[1-9]?" || { found_dev=${dev}; break;}
done
[[ -n "${found_dev}" ]] || {
juju-log "ERROR: ${func}: coult not find an unused device for regexp: ${dev_regexp}"
return 1
}
partition1_dev=${found_dev}1
juju-log "INFO: ${func}: found_dev=${found_dev}"
[[ -b ${found_dev?} ]] || {
juju-log "ERROR: ${func}: ${found_dev} is not a blockdevice"
return 2
}
# Run next set of "dangerous" commands as 'set -e', in a subshell
(
set -e
# Re-read partition - will fail if already in use
blockdev --rereadpt ${found_dev}
# IFF not present, create partition with full disk
if [[ -b ${partition1_dev?} ]];then
juju-log "INFO: ${func}: ${partition1_dev} already present - skipping sfdisk."
else
juju-log "NOTICE: ${func}: ${partition1_dev} not present at ${found_dev}, running: sfdisk ${found_dev} ..."
# Format partition1_dev as max sized
echo ",+," | sfdisk ${found_dev}
fi
# Create an ext4 filesystem if NOT already present
# use e.g. LABEl=vol-000012345
if file -s ${partition1_dev} | egrep -q ext4 ; then
juju-log "INFO: ${func}: ${partition1_dev} already formatted as ext4 - skipping mkfs.ext4."
## Check e2label - log if it has changed (e.g. already used / initialized with a diff label)
local curr_label=$(e2label "${partition1_dev}")
if [[ ${curr_label} != ${label} ]]; then
juju-log "WARNING: ${func}: ${partition1_dev} had label=${curr_label}, overwritting with label=${label}"
e2label ${partition1_dev} "${label}"
fi
else
juju-log "NOTICE: ${func}: running: mkfs.ext4 -L ${label} ${partition1_dev}"
mkfs.ext4 -L "${label}" ${partition1_dev}
fi
# Mount it at e.g. /srv/juju/vol-000012345
[[ -d "${mntpoint}" ]] || mkdir -p "${mntpoint}"
mount | fgrep -wq "${partition1_dev}" || {
local files_below_mntpoint="$(cd ${mntpoint}; ls -1A |wc -l )"
if [[ ${files_below_mntpoint} -ne 0 ]]; then
juju-log "ERROR: *not* doing 'mount "${partition1_dev}" "${mntpoint}"' because there are already ${files_below_mntpoint} files/dirs beneath '${mntpoint}'"
exit 1
fi
## should always fsck before mounting (e.g. fsck after max time (-i) / max mounts (-c) )
fsck "${partition1_dev}"
mount "${partition1_dev}" "${mntpoint}"
juju-log "INFO: ${func}: mounted as: '$(mount | fgrep -w ${partition1_dev})'"
}
# Add it to fstab is not already there
fgrep -wq "LABEL=${label}" /etc/fstab || {
echo "LABEL=${label} ${mntpoint} ext4 defaults,nobootwait,comment=${volid}" | tee -a /etc/fstab
juju-log "INFO: ${func}: LABEL=${label} added to /etc/fstab"
}
)
# Final assertion: mounted filesystem id is different from '/' (effectively mounted)
_assert_diff_fs "/" "${mntpoint}" || {
juju-log "ERROR: returning from ${func} with '${mntpoint}' still at '/' filesystem (couldn't mount new volume)"
## try to rmdir mntpoint directory - should not be 'mistakenly' used
rmdir ${mntpoint}
return 1
}
return $?
}
#------------------------------
# Get volume-id from juju config "volume-map" dictionary as
# volume-map[JUJU_UNIT_NAME]
# @return 0 if volume-map value found ( does echo volid or ""), else:
# 1 if not found or None
#
#------------------------------
volume_get_volid_from_volume_map() {
local volid=$(config-get "volume-map"|python -c$'import sys;import os;from yaml import load;from itertools import chain; volume_map = load(sys.stdin)\nif volume_map: print volume_map.get(os.environ["JUJU_UNIT_NAME"])')
[[ $volid == None ]] && return 1
echo "$volid"
}
# Returns true if permanent storage (considers --ephemeral)
# @returns 0 if volid set and not --ephemeral, else:
# 1
volume_is_permanent() {
local volid=${1:?missing volid}
[[ -n ${volid} && ${volid} != --ephemeral ]] && return 0 || return 1
}
volume_mount_point_from_volid(){
local volid=${1:?missing volid}
if volume_is_permanent "${volid}";then
echo "/srv/juju/${volid}"
return 0
else
return 1
fi
}
# Do we have a valid storage state?
# @returns 0 does echo $volid (can be "--ephemeral")
# 1 config state is invalid - we should not serve
volume_get_volume_id() {
local ephemeral_storage
local volid
ephemeral_storage=$(config-get volume-ephemeral-storage) || return 1
volid=$(volume_get_volid_from_volume_map) || return 1
if [[ $ephemeral_storage == True ]];then
# Ephemeral -> should not have a valid volid
if [[ $volid != "" ]];then
juju-log "ERROR: volume-ephemeral-storage is True, but $JUJU_UNIT_NAME maps to volid=${volid}"
return 1
fi
else
# Durable (not ephemeral) -> must have a valid volid for this unit
if [[ $volid == "" ]];then
juju-log "ERROR: volume-ephemeral-storage is False, but no volid found for: $JUJU_UNIT_NAME"
return 1
fi
fi
echo "$volid"
return 0
}
case "$1" in
## allow non SHELL scripts to call helper functions
call)
: ${JUJU_UNIT_NAME?} ## Must be called in juju environment
shift;
function="${1:?usage: ${0##*/} call function arg1 arg2 ...}"
shift;
${function} "$@" && exit 0 || exit 1
esac
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