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swh/lister/arch/lister.py

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# Copyright (C) 2022 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
import datetime
import logging
from pathlib import Path
import re
import tarfile
from typing import Any, Dict, Iterator, List, Optional
from urllib.parse import unquote, urljoin
from bs4 import BeautifulSoup
import requests
from swh.model.hashutil import hash_to_hex
from swh.scheduler.interface import SchedulerInterface
from swh.scheduler.model import ListedOrigin
from ..pattern import CredentialsType, StatelessLister
logger = logging.getLogger(__name__)
# Aliasing the page results returned by `get_pages` method from the lister.
ArchListerPage = List[Dict[str, Any]]
def size_to_bytes(size: str) -> int:
"""Convert human readable file size to bytes.
Resulting value is an approximation as input value is in most case rounded.
Args:
size: A string representing a human readable file size (eg: '500K')
Returns:
A decimal representation of file size
Examples::
>>> size_to_bytes("500")
500
>>> size_to_bytes("1K")
1000
"""
units = {
"K": 1000,
"M": 1000**2,
"G": 1000**3,
"T": 1000**4,
"P": 1000**5,
"E": 1000**6,
"Z": 1000**7,
"Y": 1000**8,
}
if size.endswith(tuple(units)):
v, u = (size[:-1], size[-1])
vlorentzUnsubmitted
Done
Inline Actions
"Y": 1000**8,
}
- if size.endswith(tuple(units.keys())):
+ if size.endswith(tuple(units)):
v, u = (size[:-1], size[-1])
vlorentz:
return int(v) * units[u]
else:
return int(size)
class ArchLister(StatelessLister[ArchListerPage]):
"""List Arch linux origins from 'core', 'extra', and 'community' repositories
For 'official' Arch Linux it downloads core.tar.gz, extra.tar.gz and community.tar.gz
from https://archive.archlinux.org/repos/last/ extract to a temp directory and
then walks through each 'desc' files.
Each 'desc' file describe the latest released version of a package and helps
to build an origin url from where scrapping artifacts metadata.
For 'arm' Arch Linux it follow the same discovery process parsing 'desc' files.
The main difference is that we can't get existing versions of an arm package
because https://archlinuxarm.org does not have an 'archive' website or api.
"""
LISTER_NAME = "arch"
VISIT_TYPE = "arch"
INSTANCE = "arch"
DESTINATION_PATH = Path("/tmp/archlinux_archive")
ARCH_PACKAGE_URL_PATTERN = "{base_url}/packages/{repo}/{arch}/{pkgname}"
ARCH_PACKAGE_VERSIONS_URL_PATTERN = "{base_url}/packages/{pkgname[0]}/{pkgname}"
ARCH_PACKAGE_DOWNLOAD_URL_PATTERN = (
"{base_url}/packages/{pkgname[0]}/{pkgname}/{filename}"
)
ARCH_API_URL_PATTERN = "{base_url}/packages/{repo}/{arch}/{pkgname}/json"
ARM_PACKAGE_URL_PATTERN = "{base_url}/packages/{arch}/{pkgname}"
ARM_PACKAGE_DOWNLOAD_URL_PATTERN = "{base_url}/{arch}/{repo}/{filename}"
def __init__(
self,
scheduler: SchedulerInterface,
credentials: Optional[CredentialsType] = None,
flavours: Dict[str, Any] = {
"official": {
"archs": ["x86_64"],
"repos": ["core", "extra", "community"],
"base_info_url": "https://archlinux.org",
"base_archive_url": "https://archive.archlinux.org",
"base_mirror_url": "",
"base_api_url": "https://archlinux.org",
},
"arm": {
"archs": ["armv7h", "aarch64"],
"repos": ["core", "extra", "community"],
"base_info_url": "https://archlinuxarm.org",
"base_archive_url": "",
"base_mirror_url": "https://uk.mirror.archlinuxarm.org",
"base_api_url": "",
},
},
):
super().__init__(
scheduler=scheduler,
credentials=credentials,
url=flavours["official"]["base_info_url"],
instance=self.INSTANCE,
)
self.flavours = flavours
def scrap_package_versions(
self, name: str, repo: str, base_url: str
) -> List[Dict[str, Any]]:
"""Given a package 'name' and 'repo', make an http call to origin url and parse its content
to get package versions artifacts data.
That method is suitable only for 'official' Arch Linux, not 'arm'.
Args:
vlorentzUnsubmitted
Done
Inline Actions

Could you assert the href, to make sure we don't accidentally drop an unrelated link if they change the order?

vlorentz: Could you assert the href, to make sure we don't accidentally drop an unrelated link if they…
name: Package name
repo: The repository the package belongs to (one of self.repos)
Returns:
A list of dict of version
Example::
[
{"url": "https://archive.archlinux.org/packages/d/dialog/dialog-1:1.3_20190211-1-x86_64.pkg.tar.xz", # noqa: B950
"arch": "x86_64",
"repo": "core",
"name": "dialog",
"version": "1:1.3_20190211-1",
"length": 180000,
vlorentzUnsubmitted
Done
Inline Actions
m = arch_rex.match(filename)
- if not m:
+ if m is None:
logger.debug(f"Can not find a match for architecture in {filename}")
vlorentz:
"filename": "dialog-1:1.3_20190211-1-x86_64.pkg.tar.xz",
"last_modified": "2019-02-13T08:36:00"},
vlorentzUnsubmitted
Done
Inline Actions

Why break instead of continue? and shouldn't the log be an error?

vlorentz: Why `break` instead of `continue`? and shouldn't the log be an `error`?
]
"""
url = self.ARCH_PACKAGE_VERSIONS_URL_PATTERN.format(
vlorentzUnsubmitted
Done
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m = arch_rex.match(filename)
if not m:
logger.debug(f"Can not find a match for architecture in {filename}")
break
- else:
arch = m.group("arch")
version = m.group("version")
+ else:
# Extract last_modified and an approximate file size
vlorentz:
pkgname=name, base_url=base_url
)
soup = BeautifulSoup(requests.get(url).text, "html.parser")
links = soup.find_all("a", href=True)
# drop the first line (used to go to up directory)
if links[0].attrs["href"] == "../":
links.pop(0)
versions = []
for link in links:
# filename displayed can be cropped if name is too long, get it from href instead
vlorentzUnsubmitted
Done
Inline Actions

ditto on all three accounts.

vlorentz: ditto on all three accounts.
filename = unquote(link.attrs["href"])
if filename.endswith((".tar.xz", ".tar.zst")):
# Extract arch from filename
arch_rex = re.compile(
rf"^{re.escape(name)}-(?P<version>.*)-(?P<arch>any|i686|x86_64)"
rf"(.pkg.tar.(?:zst|xz))$"
)
m = arch_rex.match(filename)
if m is None:
logger.error(
"Can not find a match for architecture in %(filename)s"
% dict(filename=filename)
)
else:
arch = m.group("arch")
version = m.group("version")
# Extract last_modified and an approximate file size
raw_text = link.next_sibling
raw_text_rex = re.compile(
r"^(?P<last_modified>\d+-\w+-\d+ \d\d:\d\d)\s+(?P<size>\w+)$"
)
s = raw_text_rex.search(raw_text.strip())
if s is None:
logger.error(
"Can not find a match for 'last_modified' and/or "
"'size' in '%(raw_text)s'" % dict(raw_text=raw_text)
)
else:
assert s.groups()
assert len(s.groups()) == 2
last_modified_str, size = s.groups()
# format as expected
last_modified = datetime.datetime.strptime(
last_modified_str, "%d-%b-%Y %H:%M"
).isoformat()
length = size_to_bytes(size) # we want bytes
vlorentzUnsubmitted
Done
Inline Actions

why is x86_64 hardcoded here?

vlorentz: why is `x86_64` hardcoded here?
franckbretAuthorUnsubmitted
Done
Inline Actions

Because its the only available path, check the following main links.

https://archive.archlinux.org/repos/last/core/os/
https://archive.archlinux.org/repos/last/extra/os/
https://archive.archlinux.org/repos/last/community/os/

By the way there is only 'any' or 'x86_64' arch available and we can find 'any' arch package in x86_64 path, example :

https://archive.archlinux.org/repos/last/core/os/x86_64/amd-ucode-20220509.b19cbdc-1-any.pkg.tar.zst

I did not found a package that has two different arch too.

franckbret: Because its the only available path, check the following main links. https://archive.archlinux.
vlorentzUnsubmitted
Not Done
Inline Actions

Arch used to have x86, and might add a new architecture in the future, right? I'd rather not silently ignore many packages in case we miss the news.

And is https://uk.mirror.archlinuxarm.org/ out of scope for this lister? It looks similar, but subtly different...

vlorentz: Arch used to have x86, and might add a new architecture in the future, right? I'd rather not…
franckbretAuthorUnsubmitted
Not Done
Inline Actions

I've looked at it and its the quite the same. We can get list of packages by downloading an index archive that contains all packages name and meta. The main difference is that we can't get a list of previous version per package, no need to scrap webpages in this case.

franckbret: I've looked at it and its the quite the same. We can get list of packages by downloading an…
# link url is relative, format a canonical one
vlorentzUnsubmitted
Done
Inline Actions

filename = "foo.tar.gz" should be good enough and will avoid issues with "fun" file names

vlorentz: `filename = "foo.tar.gz"` should be good enough and will avoid issues with "fun" file names
url = self.ARCH_PACKAGE_DOWNLOAD_URL_PATTERN.format(
base_url=base_url, pkgname=name, filename=filename
)
versions.append(
dict(
name=name,
version=version,
repo=repo,
arch=arch,
filename=filename,
url=url,
last_modified=last_modified,
length=length,
)
)
return versions
def get_repo_archive(self, url: str, destination_path: Path) -> Path:
"""Given an url and a destination path, retrieve and extract .tar.gz archive
which contains 'desc' file for each package.
Each .tar.gz archive corresponds to an Arch Linux repo ('core', 'extra', 'community').
Args:
url: url of the .tar.gz archive to download
destination_path: the path on disk where to extract archive
Returns:
a directory Path where the archive has been extracted to.
"""
res = requests.get(url)
destination_path.parent.mkdir(parents=True, exist_ok=True)
destination_path.write_bytes(res.content)
extract_to = Path(str(destination_path).split(".tar.gz")[0])
tar = tarfile.open(destination_path)
tar.extractall(path=extract_to)
tar.close()
return extract_to
def parse_desc_file(
self,
path: Path,
repo: str,
base_url: str,
dl_url_fmt: str,
) -> Dict[str, Any]:
"""Extract package information from a 'desc' file.
There are subtle differences between parsing 'official' and 'arm' des files
vlorentzUnsubmitted
Not Done
Inline Actions

I wonder if it would make more sense to use a relative URL here. (relative to the package's root)

vlorentz: I wonder if it would make more sense to use a relative URL here. (relative to the package's…
franckbretAuthorUnsubmitted
Done
Inline Actions

Not sure too, what does it change to do so?

franckbret: Not sure too, what does it change to do so?
vlorentzUnsubmitted
Not Done
Inline Actions

Concretely, nothing. Absolute URLs just feels redundant

vlorentz: Concretely, nothing. Absolute URLs just feels redundant
Args:
path: A path to a 'desc' file on disk
repo: The repo the package belongs to
vlorentzUnsubmitted
Done
Inline Actions

values computed here do not seem to be tested

vlorentz: values computed here do not seem to be tested
Returns:
A dict of metadata
Example::
{'api_url': 'https://archlinux.org/packages/core/x86_64/dialog/json',
'arch': 'x86_64',
'base': 'dialog',
'builddate': '1650081535',
'csize': '203028',
'desc': 'A tool to display dialog boxes from shell scripts',
'filename': 'dialog-1:1.3_20220414-1-x86_64.pkg.tar.zst',
'isize': '483988',
'license': 'LGPL2.1',
'md5sum': '06407c0cb11c50d7bf83d600f2e8107c',
'name': 'dialog',
'packager': 'Evangelos Foutras <foutrelis@archlinux.org>',
'pgpsig': 'pgpsig content xxx',
'project_url': 'https://invisible-island.net/dialog/',
'provides': 'libdialog.so=15-64',
'repo': 'core',
vlorentzUnsubmitted
Done
Inline Actions

ditto

vlorentz: ditto
'sha256sum': 'ef8c8971f591de7db0f455970ef5d81d5aced1ddf139f963f16f6730b1851fa7',
'url': 'https://archive.archlinux.org/packages/.all/dialog-1:1.3_20220414-1-x86_64.pkg.tar.zst', # noqa: B950
'version': '1:1.3_20220414-1'}
"""
rex = re.compile(r"^\%(?P<k>\w+)\%\n(?P<v>.*)\n$", re.M)
with path.open("rb") as content:
parsed = rex.findall(content.read().decode())
data = {entry[0].lower(): entry[1] for entry in parsed}
if "url" in data.keys():
data["project_url"] = data["url"]
assert data["name"]
assert data["filename"]
assert data["arch"]
data["repo"] = repo
data["url"] = urljoin(
base_url,
dl_url_fmt.format(
base_url=base_url,
pkgname=data["name"],
filename=data["filename"],
arch=data["arch"],
repo=repo,
),
)
assert data["md5sum"]
assert data["sha256sum"]
data["checksums"] = {
"md5sum": hash_to_hex(data["md5sum"]),
"sha256sum": hash_to_hex(data["sha256sum"]),
}
return data
def get_pages(self) -> Iterator[ArchListerPage]:
"""Yield an iterator sorted by name in ascending order of pages.
Each page is a list of package belonging to a flavour ('official', 'arm'),
and a repo ('core', 'extra', 'community')
"""
for name, flavour in self.flavours.items():
for arch in flavour["archs"]:
for repo in flavour["repos"]:
page = []
if name == "official":
prefix = urljoin(flavour["base_archive_url"], "/repos/last/")
filename = f"{repo}.files.tar.gz"
archive_url = urljoin(prefix, f"{repo}/os/{arch}/{filename}")
destination_path = Path(self.DESTINATION_PATH, arch, filename)
base_url = flavour["base_archive_url"]
dl_url_fmt = self.ARCH_PACKAGE_DOWNLOAD_URL_PATTERN
base_info_url = flavour["base_info_url"]
info_url_fmt = self.ARCH_PACKAGE_URL_PATTERN
elif name == "arm":
filename = f"{repo}.files.tar.gz"
archive_url = urljoin(
flavour["base_mirror_url"], f"{arch}/{repo}/{filename}"
)
destination_path = Path(self.DESTINATION_PATH, arch, filename)
base_url = flavour["base_mirror_url"]
dl_url_fmt = self.ARM_PACKAGE_DOWNLOAD_URL_PATTERN
base_info_url = flavour["base_info_url"]
info_url_fmt = self.ARM_PACKAGE_URL_PATTERN
archive = self.get_repo_archive(
url=archive_url, destination_path=destination_path
)
assert archive
packages_desc = list(archive.glob("**/desc"))
logger.debug(
"Processing %(instance)s source packages info from "
"%(flavour)s %(arch)s %(repo)s repository, "
"(%(qty)s packages)."
% dict(
instance=self.instance,
flavour=name,
arch=arch,
repo=repo,
qty=len(packages_desc),
)
)
for package_desc in packages_desc:
data = self.parse_desc_file(
path=package_desc,
repo=repo,
base_url=base_url,
dl_url_fmt=dl_url_fmt,
)
assert data["builddate"]
last_modified = datetime.datetime.fromtimestamp(
float(data["builddate"]), tz=datetime.timezone.utc
)
assert data["name"]
assert data["filename"]
assert data["arch"]
url = info_url_fmt.format(
base_url=base_info_url,
pkgname=data["name"],
filename=data["filename"],
repo=repo,
arch=data["arch"],
)
assert data["version"]
if name == "official":
# find all versions of a package scrapping archive
versions = self.scrap_package_versions(
name=data["name"],
repo=repo,
base_url=base_url,
)
elif name == "arm":
# There is no way to get related versions of a package,
# but 'data' represents the latest released version,
# use it in this case
assert data["builddate"]
assert data["csize"]
assert data["url"]
versions = [
dict(
name=data["name"],
version=data["version"],
repo=repo,
arch=data["arch"],
filename=data["filename"],
url=data["url"],
last_modified=last_modified.replace(
tzinfo=None
).isoformat(timespec="seconds"),
length=int(data["csize"]),
)
]
package = {
"name": data["name"],
"version": data["version"],
"last_modified": last_modified,
"url": url,
"versions": versions,
"data": data,
}
page.append(package)
yield page
def get_origins_from_page(self, page: ArchListerPage) -> Iterator[ListedOrigin]:
"""Iterate on all arch pages and yield ListedOrigin instances."""
assert self.lister_obj.id is not None
for origin in page:
yield ListedOrigin(
lister_id=self.lister_obj.id,
visit_type=self.VISIT_TYPE,
url=origin["url"],
last_update=origin["last_modified"],
extra_loader_arguments={
"artifacts": origin["versions"],
},
)
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