parse-usb-devices.sh

#!/usr/bin/env bash

# parse-usb-devices.sh
#
# Parse the output of the "usb-devices" bash script and filter
# only for Mass Storage devices (Class 08). Include the active
# device speed (to see whether it is USB2 or USB3.

set -e

bus="N/A"
lev="N/A"
port="N/A"
spd="N/A"

serial="N/A"
vendor="N/A"
idVendor="N/A"
idProduct="N/A"

# command info
if [ "$1" = "-h" ] || [ "$1" = "--help" ] || [ "$1" = "-help" ]; then
  echo "RaspiBlitz check speed of connected hard disk(s)"
  echo "./parse-usb-devices.sh"
  exit 1
fi

# check requirements
if ! [ -f "/usr/bin/usb-devices" ]; then
  echo "ERROR: /usr/bin/usb-devices is missing"
  exit 1
fi

# process output of usb-devices call
while read -r line; do

  firstChar=$(echo "${line}" | cut -d" " -f1)
  if [ "${firstChar}" = "T:" ]; then
    # new device
    bus=$(echo "${line}" | cut -d" " -f3 | cut -d"=" -f2)
    lev=$(echo "${line}" | cut -d" " -f4 | cut -d"=" -f2)
    port=$(echo "${line}" | cut -d" " -f6 | cut -d"=" -f2)
    spd=$(echo "${line}" | cut -d" " -f11 | cut -d"=" -f2)

  elif [ "${firstChar}" = "S:" ]; then
    # get device infos
    if $(echo "${line}" | grep -q "SerialNumber"); then
      serial=$(echo "${line}" | cut -d"=" -f2)
    fi

  elif [ "${firstChar}" = "P:" ]; then
    idVendor=$(echo "${line}" | cut -d" " -f3 | cut -d"=" -f2)
    idProduct=$(echo "${line}" | cut -d" " -f4 | cut -d"=" -f2)

    vendor=$(lsusb | grep "${idVendor}:${idProduct}" | awk '{ s = ""; for (i = 7; i <= NF; i++) s = s $i " "; print s }')

  elif [ "${firstChar}" = "I:" ]; then
    # print all on last line
    ifCls=$(echo "${line}" | cut -d" " -f8 | cut -d"=" -f2)
    if [ "${ifCls}" = "08(stor.)" ]; then
      echo "Port$((bus))-$((lev))-$((port)) USB@$((spd))Mbit/s: ${vendor} (Serial: ${serial})"
    fi
  fi

done < <(/usr/bin/usb-devices)

# EOF