update_cores.py

"""
Retroarch update existing cores script
created by /u/dafzor based on idea from /u/toeshred
version: 2017-09-04
"""
from os import listdir, remove
from os.path import isfile, join, abspath, expandvars
from urllib.request import urlretrieve
from tempfile import gettempdir
from zipfile import ZipFile
from shutil import copyfile

# variables to edit, platform is part of the path in the cores_url
PLATFORM = "windows/x86_64"
CORES_PATH = "./cores"


# sets the temporary file we'll be using for all our cores and the download directory
TEMP_FILE = join(gettempdir(), 'temp.zip')
CORES_URL = 'http://buildbot.libretro.com/nightly/{}/latest'.format(PLATFORM)
CORES_PATH = abspath(expandvars(CORES_PATH))

# gets all the cores in the retroarch core folder
for file in [f for f in listdir(CORES_PATH) if isfile(join(CORES_PATH, f))]:
    # downloads the latest version of the url
    remote_file = '{}/{}.zip'.format(CORES_URL, file)
    print ('downloading: {}'.format(remote_file))
    urlretrieve(remote_file, TEMP_FILE)

    # extracts the zip file we just downloaded
    print ('extracting: ', TEMP_FILE)
    zip = ZipFile(TEMP_FILE)
    zip.extractall(gettempdir())
    zip.close()

    # copies the cores over the existing ones
    target_file = join(CORES_PATH, file)
    print('copying over to: ', target_file)
    copyfile(join(gettempdir(), file), target_file)

# clean up the temporary file
print('deleting temp file: ', TEMP_FILE)
remove(TEMP_FILE)