Mercurial > hg
view contrib/packaging/hgpackaging/downloads.py @ 48848:17d5e25b8e78
packaging: remove py2exe / Python 2.7 support
This commit started by deleting references to py2exe (which is only used
on Python 2). After pulling the thread, quite a lot of code was orphaned
and was deleted.
Differential Revision: https://phab.mercurial-scm.org/D12265
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sat, 19 Feb 2022 22:13:11 -0700 |
parents | 2372284d9457 |
children | a7fe96abcf56 |
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# downloads.py - Code for downloading dependencies. # # Copyright 2019 Gregory Szorc <gregory.szorc@gmail.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. # no-check-code because Python 3 native. import gzip import hashlib import pathlib import urllib.request DOWNLOADS = { 'gettext': { 'url': 'https://versaweb.dl.sourceforge.net/project/gnuwin32/gettext/0.14.4/gettext-0.14.4-bin.zip', 'size': 1606131, 'sha256': '60b9ef26bc5cceef036f0424e542106cf158352b2677f43a01affd6d82a1d641', 'version': '0.14.4', }, 'gettext-dep': { 'url': 'https://versaweb.dl.sourceforge.net/project/gnuwin32/gettext/0.14.4/gettext-0.14.4-dep.zip', 'size': 715086, 'sha256': '411f94974492fd2ecf52590cb05b1023530aec67e64154a88b1e4ebcd9c28588', }, } def hash_path(p: pathlib.Path): h = hashlib.sha256() with p.open('rb') as fh: while True: chunk = fh.read(65536) if not chunk: break h.update(chunk) return h.hexdigest() class IntegrityError(Exception): """Represents an integrity error when downloading a URL.""" def secure_download_stream(url, size, sha256): """Securely download a URL to a stream of chunks. If the integrity of the download fails, an IntegrityError is raised. """ h = hashlib.sha256() length = 0 with urllib.request.urlopen(url) as fh: if ( not url.endswith('.gz') and fh.info().get('Content-Encoding') == 'gzip' ): fh = gzip.GzipFile(fileobj=fh) while True: chunk = fh.read(65536) if not chunk: break h.update(chunk) length += len(chunk) yield chunk digest = h.hexdigest() if length != size: raise IntegrityError( 'size mismatch on %s: wanted %d; got %d' % (url, size, length) ) if digest != sha256: raise IntegrityError( 'sha256 mismatch on %s: wanted %s; got %s' % (url, sha256, digest) ) def download_to_path(url: str, path: pathlib.Path, size: int, sha256: str): """Download a URL to a filesystem path, possibly with verification.""" # We download to a temporary file and rename at the end so there's # no chance of the final file being partially written or containing # bad data. print('downloading %s to %s' % (url, path)) if path.exists(): good = True if path.stat().st_size != size: print('existing file size is wrong; removing') good = False if good: if hash_path(path) != sha256: print('existing file hash is wrong; removing') good = False if good: print('%s exists and passes integrity checks' % path) return path.unlink() tmp = path.with_name('%s.tmp' % path.name) try: with tmp.open('wb') as fh: for chunk in secure_download_stream(url, size, sha256): fh.write(chunk) except IntegrityError: tmp.unlink() raise tmp.rename(path) print('successfully downloaded %s' % url) def download_entry( name: dict, dest_path: pathlib.Path, local_name=None ) -> pathlib.Path: entry = DOWNLOADS[name] url = entry['url'] local_name = local_name or url[url.rindex('/') + 1 :] local_path = dest_path / local_name download_to_path(url, local_path, entry['size'], entry['sha256']) return local_path, entry