SUMMARY

I'm trying to download configuration file from remote router and getting only last chunk of the file.

ISSUE TYPE

• Bug Report

PYLISSH and LIBSSH VERSION

0.4.0

OS / ENVIRONMENT

Ubuntu 22.04 LTS
Python 3.10.4

STEPS TO REPRODUCE

Narrowing the problem I wrote a piece of code below.
You need a file on remote host to reproduce it.

from pylibsshext.session import Session, AutoAddPolicy

hssh = Session()
p = AutoAddPolicy()
hssh.set_missing_host_key_policy(p)

HOST = 'hostname'
USER = 'username'
PASSWORD = 'password'
TIMEOUT = 30
PORT = 22

hssh.connect(
    host=HOST,
    user=USER,
    password=PASSWORD,
    timeout=TIMEOUT,
    port=PORT,
)
sftp = hssh.sftp()
sftp.get('m8.rsc', 'm8.rsc')

EXPECTED RESULTS

File 'm8.rsc' in current directory, size of 16K

ACTUAL RESULTS

File 'm8.rsc', containing last 223b of source file.

As I found out, the problem lays in line #103 of sftp.pyx

           with open(local_file, 'wb+') as f:

In python3, "w" parameter truncates the file, so during reading the source file new data overwrites old.
Please check and consider changing open mode to 'ab'