[systemd-devel] How to grant systemd-nspawn access to USB device?

[Kevin P]

Good evening everyone.
I would like a nspawn container on my Raspberry Pi (Raspbian, systemd 247)
to access a RTL2838 DVB-T USB stick.
Inside the container, dump1090 will run and feed aircraft data (piaware and
adsbexchange projects).

lsusb gives:
Bus 001 Device 005: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T

file /dev/bus/usb/001/005 returns:
/dev/bus/usb/001/005: character special (189/4)

And finally grep 189 /proc/devices shows:
189 usb_device

I edited both the .nspawn file and the .service file, of which I'm
reporting the relevant parts below.
/etc/systemd/nspawn/ads-b.nspawn
[Files]
Bind=/dev/bus/usb/001/005

systemd-nspawn at ads-b.service
[Service]
DeviceAllow=/dev/bus/usb/001/005 rwm
DeviceAllow=usb_device rwm

However I feel like I am doing something wrong, as starting dump1090 from
within the container returns permission denied.
I'll gladly take any advice :)

Kevin P.
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