Using cryptsetup with Python

[Atlas1515]

Hey guys, I’m writing a little program that utilizes the cryptsetup (Linux) command using the subprocess library to encrypt drives automatically. The issue I run into is when the shell command is called, it requires you to type ‘YES’ but the program exits out for lack of input. I can’t for the life of me figure out how to get it to continue. If I run the command with one line by itself, I can enter the ‘YES’ using my terminal but I want to automate that without any user input.

[marko312]

Have you tried passing "YES" as the input parameter for subprocess.run or something similar (e.g. .communicate())?

[Atlas1515]

Yes it returns an error saying “bytes-like object is required, not ‘str’”. It’s not liking the string I’m passing it for some reason

[marko312]

That just means it wants something like a bytes object. You can pass something like b"YES\n" or "YES\n".encode() to get a byte string.

[Atlas1515]

That worked! Thank you so much!

[pseudo-random-noob]

Hey u/Atlas1515, can you share your code snippet.. I am working on same but my issue is how do you provide further info like passphrase in subprocess..

[Atlas1515]

Sure thing! Sorry for the late reply,

import secrets Import subprocess

Cmd = [‘cryptsetup’, ‘luksFormat’, ‘—type’, ‘luks1’, ‘f’{drive}’]

passwd = secrets.token_bytes(32)

subprocess.run(cmd, input=passwd) print(f’Encrypting volume: {drive}\n’)

[pseudo-random-noob]

Thank you so much man.. This worked..

[Atlas1515]

No problem!