mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-12-29 09:26:17 -05:00
249 lines
7.1 KiB
Bash
Executable File
249 lines
7.1 KiB
Bash
Executable File
#!/bin/bash
|
|
# Copyright 2020 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.
|
|
|
|
# Used to generate symlinks for PD-NVMe devices using the disk names reported by
|
|
# the metadata server
|
|
|
|
# Locations of the script's dependencies
|
|
readonly nvme_cli_bin=/usr/sbin/nvme
|
|
|
|
# Bash regex to parse device paths and controller identification
|
|
readonly NAMESPACE_NUMBER_REGEX="/dev/nvme[[:digit:]]+n([[:digit:]]+).*"
|
|
readonly PARTITION_NUMBER_REGEX="/dev/nvme[[:digit:]]+n[[:digit:]]+p([[:digit:]]+)"
|
|
|
|
# Globals used to generate the symlinks for a PD-NVMe disk. These are populated
|
|
# by the identify_pd_disk function and exported for consumption by udev rules.
|
|
ID_SERIAL=''
|
|
ID_SERIAL_SHORT=''
|
|
|
|
#######################################
|
|
# Helper function to log an error message to stderr.
|
|
# Globals:
|
|
# None
|
|
# Arguments:
|
|
# String to print as the log message
|
|
# Outputs:
|
|
# Writes error to STDERR
|
|
#######################################
|
|
function err() {
|
|
echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $*" >&2
|
|
}
|
|
|
|
#######################################
|
|
# Retrieves the device name for an NVMe namespace using nvme-cli.
|
|
# Globals:
|
|
# Uses nvme_cli_bin
|
|
# Arguments:
|
|
# The path to the nvme namespace (/dev/nvme0n?)
|
|
# Outputs:
|
|
# The device name parsed from the JSON in the vendor ext of the ns-id command.
|
|
# Returns:
|
|
# 0 if the device name for the namespace could be retrieved, 1 otherwise
|
|
#######################################
|
|
function get_namespace_device_name() {
|
|
local nvme_json
|
|
nvme_json="$("${nvme_cli_bin}" id-ns -b "$1" | xxd -p -seek 384 | xxd -p -r)"
|
|
if [[ $? -ne 0 ]]; then
|
|
return 1
|
|
fi
|
|
|
|
if [[ -z ${nvme_json} ]]; then
|
|
err "NVMe Vendor Extension disk information not present"
|
|
return 1
|
|
fi
|
|
|
|
local device_name
|
|
device_name="$(echo "${nvme_json}" | grep device_name | sed -e 's/.*"device_name":[ \t]*"\([a-zA-Z0-9_-]\+\)".*/\1/')"
|
|
|
|
# Error if our device name is empty
|
|
if [[ -z ${device_name} ]]; then
|
|
err "Empty name"
|
|
return 1
|
|
fi
|
|
|
|
echo "${device_name}"
|
|
return 0
|
|
}
|
|
|
|
#######################################
|
|
# Retrieves the nsid for an NVMe namespace
|
|
# Globals:
|
|
# None
|
|
# Arguments:
|
|
# The path to the nvme namespace (/dev/nvme0n*)
|
|
# Outputs:
|
|
# The namespace number/id
|
|
# Returns:
|
|
# 0 if the namespace id could be retrieved, 1 otherwise
|
|
#######################################
|
|
function get_namespace_number() {
|
|
local dev_path="$1"
|
|
local namespace_number
|
|
if [[ ${dev_path} =~ ${NAMESPACE_NUMBER_REGEX} ]]; then
|
|
namespace_number="${BASH_REMATCH[1]}"
|
|
else
|
|
return 1
|
|
fi
|
|
|
|
echo "${namespace_number}"
|
|
return 0
|
|
}
|
|
|
|
#######################################
|
|
# Retrieves the partition number for a device path if it exists
|
|
# Globals:
|
|
# None
|
|
# Arguments:
|
|
# The path to the device partition (/dev/nvme0n*p*)
|
|
# Outputs:
|
|
# The value after 'p' in the device path, or an empty string if the path has
|
|
# no partition.
|
|
#######################################
|
|
function get_partition_number() {
|
|
local dev_path="$1"
|
|
local partition_number
|
|
if [[ ${dev_path} =~ ${PARTITION_NUMBER_REGEX} ]]; then
|
|
partition_number="${BASH_REMATCH[1]}"
|
|
echo "${partition_number}"
|
|
else
|
|
echo ''
|
|
fi
|
|
return 0
|
|
}
|
|
|
|
#######################################
|
|
# Generates a symlink for a PD-NVMe device using the metadata's disk name.
|
|
# Primarily used for testing but can be used if the script is directly invoked.
|
|
# Globals:
|
|
# Uses ID_SERIAL_SHORT (can be populated by identify_pd_disk)
|
|
# Arguments:
|
|
# The device path for the disk
|
|
#######################################
|
|
function gen_symlink() {
|
|
local dev_path="$1"
|
|
local partition_number
|
|
partition_number="$(get_partition_number "${dev_path}")"
|
|
|
|
if [[ -n ${partition_number} ]]; then
|
|
ln -s "${dev_path}" /dev/disk/by-id/google-"${ID_SERIAL_SHORT}"-part"${partition_number}" > /dev/null 2>&1
|
|
else
|
|
ln -s "${dev_path}" /dev/disk/by-id/google-"${ID_SERIAL_SHORT}" > /dev/null 2>&1
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
#######################################
|
|
# Populates the ID_* global variables with a disk's device name and namespace
|
|
# Globals:
|
|
# Populates ID_SERIAL_SHORT, and ID_SERIAL
|
|
# Arguments:
|
|
# The device path for the disk
|
|
# Returns:
|
|
# 0 on success and 1 if an error occurrs
|
|
#######################################
|
|
function identify_pd_disk() {
|
|
local dev_path="$1"
|
|
local dev_name
|
|
dev_name="$(get_namespace_device_name "${dev_path}")"
|
|
if [[ $? -ne 0 ]]; then
|
|
return 1
|
|
fi
|
|
|
|
ID_SERIAL_SHORT="${dev_name}"
|
|
ID_SERIAL="Google_PersistentDisk_${ID_SERIAL_SHORT}"
|
|
return 0
|
|
}
|
|
|
|
function print_help_message() {
|
|
echo "Usage: google_nvme_id [-s] [-h] -d device_path"
|
|
echo " -d <device_path> (Required): Specifies the path to generate a name"
|
|
echo " for. This needs to be a path to an nvme device or namespace"
|
|
echo " -s: Create symbolic link for the disk under /dev/disk/by-id."
|
|
echo " Otherwise, the disk name will be printed to STDOUT"
|
|
echo " -h: Print this help message"
|
|
}
|
|
|
|
function main() {
|
|
local opt_gen_symlink='false'
|
|
local device_path=''
|
|
|
|
while getopts :d:sh flag; do
|
|
case "${flag}" in
|
|
d) device_path="${OPTARG}" ;;
|
|
s) opt_gen_symlink='true' ;;
|
|
h)
|
|
print_help_message
|
|
return 0
|
|
;;
|
|
:)
|
|
echo "Invalid option: ${OPTARG} requires an argument" 1>&2
|
|
return 1
|
|
;;
|
|
*) return 1 ;;
|
|
esac
|
|
done
|
|
|
|
if [[ -z ${device_path} ]]; then
|
|
echo "Device path (-d) argument required. Use -h for full usage." 1>&2
|
|
exit 1
|
|
fi
|
|
|
|
# Ensure the nvme-cli command is installed
|
|
command -v "${nvme_cli_bin}" > /dev/null 2>&1
|
|
if [[ $? -ne 0 ]]; then
|
|
err "The nvme utility (/usr/sbin/nvme) was not found. You may need to run \
|
|
with sudo or install nvme-cli."
|
|
return 1
|
|
fi
|
|
|
|
# Ensure the passed device is actually an NVMe device
|
|
"${nvme_cli_bin}" id-ctrl "${device_path}" &> /dev/null
|
|
if [[ $? -ne 0 ]]; then
|
|
err "Passed device was not an NVMe device. (You may need to run this \
|
|
script as root/with sudo)."
|
|
return 1
|
|
fi
|
|
|
|
# Detect the type of attached nvme device
|
|
local controller_id
|
|
controller_id=$("${nvme_cli_bin}" id-ctrl "${device_path}")
|
|
if [[ ! ${controller_id} =~ nvme_card-pd ]]; then
|
|
err "Device is not a PD-NVMe device"
|
|
return 1
|
|
fi
|
|
|
|
# Fill the global variables for the id command for the given disk type
|
|
# Error messages will be printed closer to error, no need to reprint here
|
|
identify_pd_disk "${device_path}"
|
|
ret=$?
|
|
if [[ ${ret} -ne 0 ]]; then
|
|
return "${ret}"
|
|
fi
|
|
|
|
# Gen symlinks or print out the globals set by the identify command
|
|
if [[ ${opt_gen_symlink} == 'true' ]]; then
|
|
gen_symlink "${device_path}"
|
|
else
|
|
# These will be consumed by udev
|
|
echo "ID_SERIAL_SHORT=${ID_SERIAL_SHORT}"
|
|
echo "ID_SERIAL=${ID_SERIAL}"
|
|
fi
|
|
|
|
return $?
|
|
|
|
}
|
|
main "$@"
|