Python script to detect any new SD card and copy some files on it. Used to flash firmware for dVRK controllers.

firmware-updater.py

#
# Script used to monitor new block device (SD card) and copy new dVRK
# firmware files automatically
#
# Anton Deguet
#

import pyudev
import subprocess
import time
import datetime
import os
import shutil

context = pyudev.Context()
monitor = pyudev.Monitor.from_netlink(context)
monitor.filter_by(subsystem='block')

now = datetime.datetime.now()
date_time = now.strftime("%Y-%m-%d-%H.%M.%S")

for device in iter(monitor.poll, None):
    if device.action == 'add':
        # find the device and path
        dir(device)
        print('udev device: {}'.format(device))
        slash_dev = device.device_node
        print('/dev device: {}'.format(slash_dev))
        time.sleep(1.0) # 1 second to let the OS mount the device
        mount_path = subprocess.run(['findmnt', '-n', '-o', 'TARGET', slash_dev],
                                    stdout=subprocess.PIPE).stdout.decode('utf-8').strip()
        print('mount point: {}'.format(mount_path))

        # create backup dirctory if needed
        existing_files = os.listdir(mount_path)
        if existing_files:
            # create back dir
            backup_path = mount_path + '/backups'
            if not os.path.exists(backup_path):
                os.mkdir(backup_path)
            backup_path = backup_path + '/' + date_time
            if not os.path.exists(backup_path):
                os.mkdir(backup_path)
            # move files
            for f in existing_files:
                if f != 'backups':
                    full_file = mount_path + '/' + f
                    print('move {} to backup directory {}'.format(full_file, backup_path))
                    shutil.move(full_file, backup_path)

            # copy files
            files = ['BOOT.bin', 'firmware.xsvf']
            for f in files:
                print('copy {} to {}'.format(f, mount_path))
                shutil.copy(f, mount_path)

            # leave a timestamp on card
            subprocess.run(['touch', mount_path + '/created-' + date_time],
                           stdout=subprocess.PIPE)

            # and finally, umount
            umount_result = subprocess.run(['umount', mount_path],
                                           stdout=subprocess.PIPE).stdout.decode('utf-8').strip()
            print('umount {}'.format(umount_result))

Looks o.k., but why not unzip the file directly to the SD card (with -o option to overwrite)? That would preserve the original file dates, which may be useful as another check that it is the released version.

I was trying to save CPU time by only unzipping once, but preserving the original file dates is more important.

For the dVRK, the script has been moved to the main repository: jhu-dvrk/sawIntuitiveResearchKit@1313fba