On Wed, Jun 10, 2026 at 04:41:26PM -0500, izzy Meyer wrote:
> Hello misc@
>
> I have slowly been working on this now-sprawling hotplugd(8) attach
> script but I'm not a fan of how messy and complex it has gotten. Any
> tips to clean it up and make it more modular? I don't like the usbdevs
> hack, it feels uncomfortable to me for some reason. How do your
> hotplugd(8) scripts look?
Here's mine
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#!/bin/sh
DEVCLASS=$1
DEVNAME=$2
case $DEVNAME in
audio[0-9])
sndioctl server.device=${DEVNAME#audio}
;;
midi[0-9])
sndioctl -f midithru/0 server.port=+${DEVNAME#midi}
;;
urndis0)
ifconfig $DEVNAME autoconf
esac
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
The midi part requires the diff that just went to tech@, though
>
> /etc/hotplug $ bat -l sh -pp attach
> #!/bin/ksh
>
> DEVCLASS=$1
> DEVICE=$2
>
> [ "$DEVCLASS" -eq 0 ] || exit 0
>
> case "$DEVICE" in
> ugen*)
> # printer for CUPS
> if usbdevs -v | grep -q '03f0:dd11'; then
>
> ugen=$(usbdevs -v | awk '
> /03f0:dd11/ { found=1 }
> found && /driver: ugen[0-9]+/ {
> sub(/^[[:space:]]*driver: /, "")
> print
> exit
> }
> ')
>
> [ "$DEVICE" = "$ugen" ] || exit 0
>
> usbctl=$(usbdevs -v | awk -v dev="$ugen" '
> /^Controller \/dev\/usb[0-9]+:/ {
> ctl=$2
> sub(":", "", ctl)
> }
> $0 ~ ("driver: " dev "$") {
> print ctl
> exit
> }
> ')
>
> logger -t hotplug "Printer attached"
>
> if [ -n "$usbctl" ]; then
> chown _cups:_saned /dev/${ugen}.* "$usbctl"
> chmod 660 /dev/${ugen}.* "$usbctl"
> fi
> # usb midi keyboard setup for LMMS
> elif usbdevs -v | grep -q '28e9:0001'; then
> logger -t hotplug "USB Midi Keyboard Attached"
>
> ( midicat -q midi/0 -q midithru/0 ) &
> fi
> ;;
Hopefully the midicat(1)-based plmbing won't be needed anymore. See:
https://marc.info/?l=openbsd-tech&m=178116365373422
> uvideo*)
> # usb webcam setup for video calls
> logger -t hotplug "USB Webcam attached"
>
> chown nobody:nobody /dev/video*
> chmod 0777 /dev/video*
> ;;
I'd suggest simply changing /dev/video* ownership to your user id,
after each upgrade.
Another option, for multi-user machines, would be to add /dev/video*
to /etc/fbtab, ex:
/dev/ttyC0 0600 /dev/video0:/dev/video1
This changes the video devices ownership to the user logged on the
console. Not perfect as /dev/videoN are not revoked when you logout,
but it's much better than world readable devices.
