systemd [/lib/systemd/system-sleep/usb] USB hub unbind/bind properly on suspend/resume

usb

#!/bin/sh

mount_path=/media/neutron
mount_match="(DataBackup|DataLife)"
usb_drivers_path=/sys/bus/usb/drivers
usb_hub_list=/tmp/usb-hub.list

unbind_usb_hub () {
  > $usb_hub_list

  for i in $(find $usb_drivers_path/hub 2>/dev/null | egrep '[0-9]+\-[0-9]+\:.*$'); do
    device=$(basename $i)
    path=$(dirname $i)/unbind

    echo "Unbind device $device in $path ..."
    echo -n $device > $path
    echo $i >> $usb_hub_list
  done
}

bind_usb_hub () {
  for i in $(cat $usb_hub_list); do
    device=$(basename $i)
    path=$(dirname $i)/bind

    echo "Bind device $device in $path ..."
    echo -n $device > $path
  done
}

close_all_usb_disks_programs () {
  pids=$(lsof -n | egrep "$mount_path/$mount_match" | awk '{print $2}' | sort | uniq)
  retry=3
  alive=

  test -n "$pids" && kill $pids

  while [ -n "$pids" ] && [ $retry -gt 0 ]; do
    test -n "$alive" && kill $alive

    alive=
    for p in $pids; do
      if ps aux | awk '{print $2}' | grep -w $p >/dev/null ; then
        alive="$p $alive"
      fi
    done

    if [ -z "$alive" ]; then
      retry=0
    else
      retry=$((retry - 1))
      sleep 2
    fi
  done

  test -n "$alive" && kill -9 $alive
}

unmount_all () {
  sync
  mounts=$(mount | egrep "$mount_path/$mount_match" | awk '{print $1}')
  for m in $mounts; do
    echo "Unmount $m ..."
    umount $m
  done
}

case $1 in
  pre)
    close_all_usb_disks_programs
    unmount_all
    unbind_usb_hub
    modprobe -r uas
    ;;
  post)
    modprobe uas
    bind_usb_hub
    ;;
esac