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nixos-images: update
https://discourse.nixos.org/t/announcement-moving-nixos-org-to-netlify/6212
This commit is contained in:
dramforever
parent
a14304c1b2
commit
4afe8ac16d
188
nixos-images.py
188
nixos-images.py
@ -2,6 +2,7 @@
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import hashlib
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import logging
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import lzma
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import minio
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import os
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import re
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import sys
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@ -11,6 +12,7 @@ import subprocess
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from pyquery import PyQuery as pq
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from datetime import datetime, timedelta
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from pathlib import Path
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from collections import defaultdict
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from urllib3.util.retry import Retry
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@ -38,14 +40,8 @@ def http_head(*args, **kwargs):
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def http_get(*args, **kwargs):
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return session.get(*args, timeout=TIMEOUT, **kwargs)
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def file_sha256(dest):
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sha = subprocess.check_output(
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[ 'sha256sum', str(dest) ],
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universal_newlines=True
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)
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return sha.split(' ')[0]
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def atomic_write_file(dest, contents):
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dest.parent.mkdir(parents=True, exist_ok=True)
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tmp_dest = dest.parent / f'.{dest.name}.tmp'
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with tmp_dest.open('w') as f:
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f.write(contents)
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@ -93,156 +89,50 @@ def download(url, dest):
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download_dest.rename(dest)
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def get_links(url):
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r = http_get(url)
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r.raise_for_status()
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client = minio.Minio('s3.amazonaws.com')
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node = pq(r.content)
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links = []
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for row in node('tr'):
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td = pq(row)('td')
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if len(td) != 5:
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continue
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link_target = td[1].find('a').get('href')
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if link_target.startswith('/'):
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# Link to parent directory
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continue
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last_updated = td[2].text.strip()
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links.append((link_target, last_updated))
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return links
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def get_channel(chan_location):
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release_res = http_get(chan_location)
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release_res.raise_for_status()
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node = pq(release_res.text)
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tagline = node('p').text()
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tagline_res = re.match(r'^Released on (.+) from', tagline)
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assert tagline_res is not None
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released_time = tagline_res[1]
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files = []
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for row in node('tr'):
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td = pq(row)('td')
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if len(td) != 3:
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continue
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file_name, file_size, file_hash = (pq(x).text() for x in td)
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files.append((file_name, file_size, file_hash))
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return {
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'released_time': released_time,
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'files': files
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}
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def get_url(name):
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response = client.get_object('nix-channels', name)
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return response.headers['x-amz-website-redirect-location']
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def clone_images():
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for channel, chan_updated in get_links(f'{UPSTREAM_URL}/'):
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if not channel.startswith('nixos-') \
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or channel.endswith('-small') \
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or channel == 'nixos-unstable':
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DOWNLOAD_MATCH = r'nixos-\d\d.\d\d/latest-nixos-\w+-\w+-linux.\w+(.sha256)?'
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object_names = [
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x.object_name
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for x in client.list_objects_v2('nix-channels', recursive=True)
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if re.fullmatch(DOWNLOAD_MATCH, x.object_name)
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]
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channels = defaultdict(lambda: [])
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for name in object_names:
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chan, file = name.split('/', 1)
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channels[chan].append(file)
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for channel, files in channels.items():
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chan_dir = working_dir / channel
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git_rev = http_get(get_url(f'{channel}/git-revision')).text
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git_rev_path = chan_dir / 'git-revision'
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if git_rev_path.exists() and git_rev == git_rev_path.read_text():
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continue
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if datetime.strptime(chan_updated, '%Y-%m-%d %H:%M') < CLONE_SINCE:
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continue
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logging.info(f'- {channel} -> {git_rev}')
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chan_path = working_dir / channel
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chan_path.mkdir(parents=True, exist_ok=True)
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for file in files:
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logging.info(f' - {file}')
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url = get_url(f'{channel}/{file}')
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res = http_head(f'{UPSTREAM_URL}/{channel}', allow_redirects=False)
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res.raise_for_status()
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try:
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download(url, chan_dir / file)
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except requests.HTTPError as e:
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if e.response.status_code == 404:
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logging.info(f' - 404, skipped')
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else:
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raise
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chan_location = res.headers['Location']
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chan_release_basename = chan_location.split('/')[-1]
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try:
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last_url = (chan_path / '.last-url').read_text()
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except (IOError, OSError):
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last_url = 'not available'
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if chan_location == last_url:
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continue
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logging.info(f'- {channel} -> {chan_release_basename}')
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# Matches nixos-19.03 -> nixos-19.03beta171840.23fd1394dc6
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# ^-------------^
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if chan_release_basename.startswith(channel + 'beta'):
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logging.info(f' - Beta channel, not updating')
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continue
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chan_info = get_channel(chan_location)
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atomic_write_file(chan_path / '.released-time', chan_info['released_time'])
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has_hash_fail = False
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keep_files = { '.last-url', '.released-time' }
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rename_files = []
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logging.info(f' - Downloading new files')
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chan_version = channel.split('-', 1)[1]
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chan_release_version = chan_release_basename.split('-', 1)[1]
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simplify_name = lambda fname: fname.replace(f'-{chan_release_version}-', f'-{chan_version}-')
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image_files = [
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(simplify_name(file_name), file_name, file_hash)
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for file_name, _file_size, file_hash in chan_info['files']
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if file_name.endswith('.iso') or file_name.endswith('ova')
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]
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for mirror_file_name, upstream_file_name, file_hash in image_files:
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keep_files.add(mirror_file_name)
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logging.info(f' - {upstream_file_name} -> {mirror_file_name}')
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tmp_dest = f'.update.{upstream_file_name}'
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rename_files.append((tmp_dest, mirror_file_name))
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download(f'{chan_location}/{upstream_file_name}', chan_path / tmp_dest)
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actual_hash = file_sha256(chan_path / tmp_dest)
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if file_hash != actual_hash:
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has_hash_fail = True
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logging.error(f' - Incorrect hash')
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logging.error(f' actual {actual_hash}')
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logging.error(f' expected {file_hash}')
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logging.info(f' - File saved as {tmp_dest}')
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if has_hash_fail:
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logging.warn(f' - Found bad files. Will retry next time.')
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else:
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logging.info(f' - Renaming files')
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for tmp_dest, mirror_file_name in rename_files:
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(chan_path / tmp_dest).rename(chan_path / mirror_file_name)
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logging.info(f' - Removing useless files')
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for file_path in chan_path.iterdir():
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file_name = file_path.name
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if file_name not in keep_files:
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logging.info(f' - {file_name}')
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file_path.unlink()
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logging.info(f' - Writing SHA256SUMS')
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with (chan_path / 'SHA256SUMS').open('w') as f:
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for mirror_file_name, _upstream_file_name, file_hash in image_files:
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f.write(f'{file_hash} *{mirror_file_name}\n')
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logging.info(f' - Update finished')
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atomic_write_file(chan_path / '.last-url', chan_location)
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atomic_write_file(git_rev_path, git_rev)
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if __name__ == "__main__":
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clone_images()
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