Script for windows that converts IntxLNK files to NTFS junctions

IntxLNK2Junction.py

#! /C/Windows/System32/cmd.exe /s /c python
from subprocess import run, PIPE
from sys import argv, executable
from os.path import realpath
import os
try:
    run(['mklink'], shell=True, stdout=PIPE, stderr=PIPE)
except FileNotFoundError:
    print('Python seems to be launched not from cmd.exe.\nPress enter to restart in cmd....', end='')
    input()
    run(['C:/Windows/System32/cmd.exe', '/s', '/c', executable] + argv)
argv0, *argv = argv
reps = []
files = []
nolog = False
nokeep = False
logfile = None

def proceed_file(f):
    ff = open(f, 'rb')
    data = ff.read()
    ff.close()
    if data[:8] != b'IntxLNK\x01':
        if not nolog:
            logfile.write('{0} - not IntxLNK\r\n'.format(f))
        return
    p = data[8:].decode('utf-16')
    for r in reps:
        l = len(r[0])
        if p[:l] == r[0]:
            p = r[1] + p[l:]
            break
    if nokeep:
        os.remove(f)
    else:
        os.rename(f, f + '.i2j_old')
    pr = run(['mklink', '/j', f, realpath(p)], shell=True)
    rc = pr.returncode
    if not nolog:
        logfile.write('{0} - {1}\r\n'.format(f, 'OK' if rc == 0 else 'error ' + str(rc)))

while len(argv) != 0:
    a, *argv = argv
    if len(a) == 0:
        continue
    if a[0] != '-':
        files.append(a)
    elif a in ('-n', '--nolog'):
        nolog = True
    elif a in ('-N', '--nokeep'):
        nokeep = True
    elif a in ('-r', '--replace'):
        if len(argv) < 2:
            print('Key `-r\' requires 2 arguments')
            exit(1)
        reps.append(argv[:2])
        argv = argv[2:]
    elif a in ('-h', '--help'):
        print('Usage:\n{0} [{{-n|--nolog}}] [{{-N|--nokeep}}] [{{-r|--replace}} <POSIX mount point> <DOS disk path>] <files...>'.format(argv0))
        exit(0)
    else:
        print('Unknown key: `{0}\''.format(a))
        exit(1)
if not nolog:
    logfile = open('.i2j.log', 'a')
try:
    for f in files:
        proceed_file(f)
except BaseException as e:
    if logfile:
        logfile.close()
    raise e
if logfile:
    logfile.close()