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#!/bin/sh
symlink_action() {
case "$ACTION" in
add) ln -sf "$1" "$2";;
remove) rm -f "$2";;
esac
}
: ${SYSFS:=/sys}
# cdrom symlink
case "$MDEV" in
sr*|xvd*)
caps="$(cat $SYSFS/block/$MDEV/capability 2>/dev/null)"
if [ $(( 0x${caps:-0} & 8 )) -gt 0 ]; then
symlink_action $MDEV cdrom
fi
esac
# by-id symlinks
mkdir -p disk/by-id
partition=$(cat $SYSFS/class/block/$MDEV/partition 2>/dev/null)
case "$partition" in
[0-9]*) partsuffix="-part$partition";;
esac
wwid=$(cat $SYSFS/class/block/$MDEV/wwid 2>/dev/null)
: ${wwid:=$(cat $SYSFS/class/block/$MDEV/device/wwid 2>/dev/null)}
if [ -n "$wwid" ]; then
case "$MDEV" in
nvme*) symlink_action ../../$MDEV disk/by-id/nvme-${wwid}${partsuffix};;
esac
case "$wwid" in
naa.*) symlink_action ../../$MDEV disk/by-id/wwn-0x${wwid#naa.};;
esac
fi
serial=$(sed -E -e 's/^\s+//' -e 's/\s+$//' -e 's/ /_/g' \
$SYSFS/class/block/$MDEV/device/serial 2>/dev/null)
model=$(sed -E -e 's/^\s+//' -e 's/\s+$//' -e 's/ /_/g' \
$SYSFS/class/block/$MDEV/device/model 2>/dev/null)
if [ -n "$serial" ] && [ -n "$model" ]; then
case "$MDEV" in
nvme*) symlink_action ../../$MDEV disk/by-id/nvme-${model}_${serial}${partsuffix};;
esac
fi
# virtio-blk
if [ -n "$serial" ]; then
case "$MDEV" in
vd*) symlink_action ../../$MDEV disk/by-id/virtio-${serial}${partsuffix};;
esac
fi
# by-uuid, by-partuuid
eval $(blkid /dev/$MDEV | cut -d: -f2-)
if [ -n "$UUID" ]; then
mkdir -p disk/by-uuid
symlink_action ../../$MDEV disk/by-uuid/$UUID
fi
if [ -n "$PARTUUID" ]; then
mkdir -p disk/by-partuuid
symlink_action ../../$MDEV disk/by-partuuid/$PARTUUID
fi
# backwards compatibility with /dev/usbdisk for /dev/sd*
if [ "${MDEV#sd}" != "$MDEV" ]; then
sysdev=$(readlink $SYSFS/class/block/$MDEV)
case "$sysdev" in
*usb[0-9]*)
# require vfat for devices without partition
if ! [ -e $SYSFS/block/$MDEV ] || [ TYPE="vfat" ]; then
symlink_action $MDEV usbdisk
fi
;;
esac
fi
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