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#!/usr/bin/python3
"""
sense the own system when cloning from a Freeduc drive
"""
from subprocess import run
def ownDevice(blockSize = 4194304):
"""
Find the device path of the USB stick itself, when cloning in "own" mode
@param blockSize the size of wanted blocks; defaults to 4194304 == 4M
@return the path of the USB stick's device and its size in blocks unit
"""
cmd="mount | grep /usr/lib/live/mount | grep /dev/sd | awk '{print $1}'| head -n 1"
completed = run(cmd, shell=True, capture_output=True, encoding="utf-8")
device = completed.stdout.strip()
if device == "":
raise Exception("No own device, are we running a non-Freeduc system?")
cmd=f"LANG=C sfdisk -l {device} | head -n1| awk '{{print $7}}'"
completed = run(cmd, shell=True, capture_output=True, encoding="utf-8")
sectors=int(completed.stdout.strip())
count = 1 + sectors*512//blockSize # convert 512 B sectors to 4 MiB blocks
return device, count
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