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#!/usr/bin/env python
'''Fetch the MSYS2 installer.'''
from __future__ import annotations
import hashlib
import json
import shutil
import sys
from pathlib import Path
from tempfile import TemporaryDirectory
from typing import Final
from urllib.request import Request, urlopen
REPO: Final = 'msys2/msys2-installer'
def get_latest_release() -> tuple[str, str]:
'''Get the latest release for the repo.'''
REQUEST: Final = Request(
url=f'https://api.github.com/repos/{REPO}/releases',
headers={
'Accept': 'application/vnd.github+json',
'X-GitHub-API-Version': '2022-11-28',
},
method='GET',
)
print('>>> Fetching release list')
with urlopen(REQUEST, timeout=15) as response:
if response.status != 200:
print(f'!!! Failed to fetch release list, status={response.status}')
sys.exit(1)
data = json.load(response)
data = list(filter(lambda x: x['name'] != 'Nightly Installer Build', data))
name = data[0]['name']
version = data[0]['tag_name'].replace('-', '')
return name, version
def fetch_release_asset(tmpdir: Path, name: str, file: str) -> Path:
'''Fetch a specific release asset.'''
REQUEST: Final = Request(
url=f'https://github.com/{REPO}/releases/download/{name}/{file}',
method='GET',
)
TARGET: Final = tmpdir / file
print(f'>>> Downloading {file}')
with urlopen(REQUEST, timeout=15) as response:
if response.status != 200:
print(f'!!! Failed to fetch {file}, status={response.status}')
sys.exit(1)
TARGET.write_bytes(response.read())
return TARGET
def main() -> None:
'''Core program logic.'''
if len(sys.argv) != 2:
print(f'{__file__} must be run with exactly one argument.')
target = Path(sys.argv[1])
tmp_target = target.with_name(f'.{target.name}.tmp')
name, version = get_latest_release()
with TemporaryDirectory() as tmpdir:
tmppath = Path(tmpdir)
installer = fetch_release_asset(tmppath, name, f'msys2-base-x86_64-{version}.tar.zst')
checksums = fetch_release_asset(tmppath, name, f'msys2-base-x86_64-{version}.tar.zst.sha256')
print('>>> Verifying SHA256 checksum')
expected_checksum = checksums.read_text().partition(' ')[0].casefold()
actual_checksum = hashlib.sha256(installer.read_bytes()).hexdigest().casefold()
if expected_checksum != actual_checksum:
print('!!! Checksum mismatch')
print(f'!!! Expected: {expected_checksum}')
print(f'!!! Actual: {actual_checksum}')
sys.exit(1)
print(f'>>> Copying to {target}')
shutil.copy(installer, tmp_target)
tmp_target.replace(target)
if __name__ == '__main__':
main()
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