Bash script: Code To Attach USB by ID to VM in Qubes 4.0

General Discussion
1

I need a script solution that will consistently attach a USB to a qube & mount it.

@ jevank gave a solution that uses product ID, here: How To Attach A USB To VM Via the USB Name? - #3 by Emily

The solution works in 4.1.

Well several days trying everything, I just can’t get a solution to work in 4.0.

Do you have some working code for this?

2

I’ve never tried it on 4.0 (and you have probably switched away from it at this point), but I wrote a shitty bash function that needs id+name combination used in modern qubes as input (instead of just id) for this purpose:

usb-attach(){ # Attach multiple devices to a domain by name
# Use it like this:
# usb-attach <domain> <list_of_usb_device_names>
    if [ -z "$1" ]; then
        echo "Error: No target domain"
        return 1
    elif [ -z "$2" ]; then
        echo "Error: No devices to attach"
        return 1
    fi
    read -ra devices_target <<< "$2"
    readarray -t devices_all <<< $(qvm-device usb list | cat)
    echo "Attaching devices:"
    for device in "${devices_all[@]}"; do
        read -ra device_entry <<< "${device[@]}"
        for device_name in "${devices_target[@]}"; do
            if [ ${device_entry[1]} = $device_name ]; then
	            qvm-device usb attach "$1" ${device_entry[0]}
                echo ${device_entry[0]}
            fi
        done
    done
    unset \
        devices_target \
        devices_all \
        device \
        device_name \
        device_entry
}

I think it begs for improvement, especially the input parsing “solution”, so contributions are welcome.

How it works:

  1. Checks if inputs are present with this:

       if [ -z "$1" ]; then
       echo "Error: No target domain"
       return 1
   elif [ -z "$2" ]; then
       echo "Error: No devices to attach"
       return 1
   fi

  2. Splits the second input into array devices_target (spaces are delimiters):

    read -ra devices_target <<< "$2"

  3. Splits whatever qvm-device usb list | cat spits out into array of strings devices_all (newlines are delimiters):

    readarray -t devices_all <<< $(qvm-device usb list | cat)

    Pipe to cat is used to get rid of headings in the qvm-device’s output

  4. Checks each present devices’ name (device_entry[1]) against all given target names (device_name); if true, attaches the device:

       for device in "${devices_all[@]}"; do
       read -ra device_entry <<< "${device[@]}"
       for device_name in "${devices_target[@]}"; do
           if [ ${device_entry[1]} = $device_name ]; then
	            qvm-device usb attach "$1" ${device_entry[0]}
                echo ${device_entry[0]}
           fi
       done
   done

  5. Cleans up after itself because I don’t really know how to apply local

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