mdev-helpers

block-device (1038B)

#!/bin/sh
# Copyright ⓞ 2026 Haelwenn (lanodan) Monnier
# SPDX-License-Identifier: BSD-3-Clause
[ -n "${MDEV}" ] || exit 2
case "$MDEV" in
	nvme*) type="nvme" ;;
	sd*) type="ata" ;;
	*) type="generic" ;;
esac
set -e
# set >> /tmp/mdev_block_dev_"${MDEV}"_"$(date +%s.%N)".txt
str_norm() {
	sed -n 's/^ *// ; s/ *$// ; s/[^a-zA-Z0-9]/_/g ; p' "$@"
}
model_path="/sys/class/block/${MDEV}/device/model"
serial_path="/sys/class/block/${MDEV}/device/serial"
disk_id="${MDEV}"
if test -f "${model_path}" && test -f "${serial_path}" ; then
	serial=$(str_norm "$serial_path")
	model=$(str_norm "$model_path")
	disk_id="${type}-${model}_${serial}"
	[ -n "$PARTN" ] && disk_id="${disk_id}-part${PARTN}"
else
	disk_id=$(disk_id "/dev/${MDEV}")
	[ -n "${disk_id}" ] || exit 2
	disk_id="${type}-${disk_id}"
	[ -n "$PARTN" ] && disk_id="${disk_id}-part${PARTN}"
fi
case "${ACTION}" in
	'add'|'')
		mkdir -p /dev/disk/by-id
		ln -snf "/dev/${MDEV}" "/dev/disk/by-id/${disk_id}"
	;;
	'remove')
		rm -f "/dev/disk/by-id/${disk_id}"
	;;
esac