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#!/usr/bin/env python3

import argparse

import os

import pathlib

import sys

import time

import zipfile

from urllib.request import urlretrieve

def fetch_zip(commit_hash, zip_dir, *, org='python', binary=False, verbose):

repo = f'cpython-{"bin" if binary else "source"}-deps'

url = f'https://github.com/{org}/{repo}/archive/{commit_hash}.zip'

reporthook = None

if verbose:

reporthook = print

zip_dir.mkdir(parents=True, exist_ok=True)

filename, headers = urlretrieve(

url,

zip_dir / f'{commit_hash}.zip',

reporthook=reporthook,

)

return filename

def extract_zip(externals_dir, zip_path):

with zipfile.ZipFile(os.fspath(zip_path)) as zf:

zf.extractall(os.fspath(externals_dir))

return externals_dir / zf.namelist()[0].split('/')[0]

def parse_args():

p = argparse.ArgumentParser()

p.add_argument('-v', '--verbose', action='store_true')

p.add_argument('-b', '--binary', action='store_true',

help='Is the dependency in the binary repo?')

p.add_argument('-O', '--organization',

help='Organization owning the deps repos', default='python')

p.add_argument('-e', '--externals-dir', type=pathlib.Path,

help='Directory in which to store dependencies',

default=pathlib.Path(__file__).parent.parent / 'externals')

p.add_argument('tag',

help='tag of the dependency')

return p.parse_args()

def main():

args = parse_args()

zip_path = fetch_zip(

args.tag,

args.externals_dir / 'zips',

org=args.organization,

binary=args.binary,

verbose=args.verbose,

)

final_name = args.externals_dir / args.tag

extracted = extract_zip(args.externals_dir, zip_path)

for wait in [1, 2, 3, 5, 8, 0]:

try:

extracted.replace(final_name)

break

except PermissionError as ex:

retry = f" Retrying in {wait}s..." if wait else ""

print(f"Encountered permission error '{ex}'.{retry}", file=sys.stderr)

time.sleep(wait)

else:

print(

f"ERROR: Failed to extract {final_name}.",

"You may need to restart your build",

file=sys.stderr,

)

sys.exit(1)

if __name__ == '__main__':

main()

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