nvchecker/nvchecker_source/apt.py

79 lines
2.2 KiB
Python

# MIT licensed
# Copyright (c) 2020 Felix Yan <felixonmars@archlinux.org>, et al.
import asyncio
from nvchecker.api import (
session, GetVersionError,
VersionResult, Entry, AsyncCache, KeyManager,
)
APT_RELEASE_URL = "%s/dists/%s/Release"
APT_PACKAGES_PATH = "%s/binary-%s/Packages%s"
APT_PACKAGES_URL = "%s/dists/%s/%s"
APT_PACKAGES_SUFFIX_PREFER = (".xz", ".gz", "")
def _decompress_data(url: str, data: bytes) -> str:
if url.endswith(".xz"):
import lzma
data = lzma.decompress(data)
elif url.endswith(".gz"):
import gzip
data = gzip.decompress(data)
else:
raise NotImplementedError(url)
return data.decode('utf-8')
async def get_url(url: str) -> str:
res = await session.get(url)
data = res.body
loop = asyncio.get_running_loop()
return await loop.run_in_executor(
None, _decompress_data,
url, data)
async def get_version(
name: str, conf: Entry, *,
cache: AsyncCache, keymanager: KeyManager,
**kwargs,
) -> VersionResult:
srcpkg = conf.get('srcpkg')
pkg = conf.get('pkg')
mirror = conf['mirror']
suite = conf['suite']
repo = conf.get('repo', 'main')
arch = conf.get('arch', 'amd64')
strip_release = conf.get('strip_release', False)
if srcpkg and pkg:
raise GetVersionError('Setting both srcpkg and pkg is ambigious')
elif not srcpkg and not pkg:
pkg = name
apt_release = await cache.get(
APT_RELEASE_URL % (mirror, suite), get_url) # type: ignore
for suffix in APT_PACKAGES_SUFFIX_PREFER:
packages_path = APT_PACKAGES_PATH % (repo, arch, suffix)
if " " + packages_path in apt_release:
break
else:
raise GetVersionError('Packages file not found in APT repository')
apt_packages = await cache.get(
APT_PACKAGES_URL % (mirror, suite, packages_path), get_url) # type: ignore
pkg_found = False
for line in apt_packages.split("\n"):
if pkg and line == "Package: " + pkg:
pkg_found = True
if srcpkg and line == "Source: " + srcpkg:
pkg_found = True
if pkg_found and line.startswith("Version: "):
version = line[9:]
if strip_release:
version = version.split("-")[0]
return version
raise GetVersionError('package not found in APT repository')