FInd the largest available block device

aws-find-disk.py

#!/usr/bin/env python3

import subprocess
import json
from pprint import pprint

res = subprocess.check_output('lsblk --json --bytes', shell=True)

d = json.loads(res)

max_size = 0
device_name = None
for device in d['blockdevices']:
    if device['mountpoint'] is not None:
        continue # skip mounted devices
    if 'children' in device:
        continue # skip master devices
    if int(device['size']) > max_size:
        max_size = int(device['size'])
        device_name = device['name']

print(f'/dev/{device_name}')