USB Attachment "Backend Side" Logs?

[Matthew Roy]

When attaching a USB device from a new, disposable & minimal-template-based, sys-usb, I get the following error:

user@dom0 ~]$ qvm-usb attach disp6xx5 sys-usb-dvm:2-2
Device attach failed: No device info received, connection failed, check backend side for details

I'm not sure where to look for logs or error output on the "backend side". Can anyone shed some light on this?

When I looked in the source code I can see the error comes from qubes-app-linux-usb-proxy in the bash shell script "usb-import", line 101:

# check for unexpected EOF
if [ -z "$untrusted_devid" -a -z "$untrusted_speed" ]; then
    echo "No device info received, connection failed, check backend side for details" >&2
    exit 1
fi

But I'm not really sure at a higher level what's going on in those lines and where I should look for the issue.

Thank you,

Matthew

[awokd]

Matthew Roy:

> When attaching a USB device from a new, disposable &
> minimal-template-based, sys-usb, I get the following error:
>
> user@dom0 ~]$ qvm-usb attach disp6xx5 sys-usb-dvm:2-2
>> Device attach failed: No device info received, connection failed, check
>> backend side for details

Try making a regular AppVM sys-usb from that same template and see if
you have the same issue. You might not have the required usb proxy
packages installed in the template.

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[Matthew Roy]

Thanks, that approach helped.

While I never did find any "backend" logs, I solved this problem by also installing the package `qubes-usb-proxy` in the template for the new disposable sys-usb.

Matthew

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