| #!/bin/bash |
| # Copyright 2018 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| # |
| # This script creates a symlink using udev to the stateful device. |
| # |
| # Positional arguments: symlink device_path |
| # symlink is a relative path in /dev to the desired location of the output |
| # symlink. |
| # device_path is an absolute file path or absolute file path prefix. It is |
| # interpreted as an absolute file path prefix if and only if it ends with |
| # a * character. |
| |
| set -o errexit |
| set -o pipefail |
| |
| get_device() { |
| local -r dev="$1" |
| udevadm settle |
| if [[ "${dev: -1}" != "*" ]]; then |
| echo "${dev}" |
| return |
| fi |
| echo "${dev::-1}"* | tr " " "\n" | sort -V | tail -n 1 |
| } |
| |
| main() { |
| local -r symlink="$1" |
| local -r input_dev="$2" |
| local -r dev="$(get_device "${input_dev}")" |
| local real_dev |
| if [[ -b "${dev}" ]]; then |
| real_dev="$(realpath "${dev}")" |
| echo "KERNEL==\"${real_dev#/dev/}\", SYMLINK+=\"${symlink}\"" > \ |
| /etc/udev/rules.d/00-stateful-dev.rules |
| udevadm control -R |
| udevadm trigger "${real_dev}" |
| else |
| echo "not a valid device: ${dev}" |
| return 1 |
| fi |
| } |
| |
| main "$@" |
