Source code for swh.loader.package.debian.loader

# Copyright (C) 2017-2019  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 email.utils
import logging
from os import path
import re
import subprocess
from typing import (
    Any,
    Dict,
    FrozenSet,
    Iterator,
    List,
    Mapping,
    Optional,
    Sequence,
    Tuple,
)

import attr
from dateutil.parser import parse as parse_date
from debian.changelog import Changelog
from debian.deb822 import Dsc

from swh.loader.package.loader import BasePackageInfo, PackageLoader
from swh.loader.package.utils import download, release_name
from swh.model.model import (
    Person,
    Revision,
    RevisionType,
    Sha1Git,
    TimestampWithTimezone,
)

logger = logging.getLogger(__name__)
UPLOADERS_SPLIT = re.compile(r"(?<=\>)\s*,\s*")


[docs]@attr.s class DebianFileMetadata: md5sum = attr.ib(type=str) name = attr.ib(type=str) """Filename""" sha256 = attr.ib(type=str) size = attr.ib(type=int) uri = attr.ib(type=str) """URL of this specific file"""
[docs]@attr.s class DebianPackageChangelog: person = attr.ib(type=Dict[str, str]) """A dict with fields like, model.Person, except they are str instead of bytes, and 'email' is optional.""" date = attr.ib(type=str) """Date of the changelog entry.""" history = attr.ib(type=List[Tuple[str, str]]) """List of tuples (package_name, version)"""
[docs]@attr.s class DebianPackageInfo(BasePackageInfo): raw_info = attr.ib(type=Dict[str, Any]) files = attr.ib(type=Dict[str, DebianFileMetadata]) """Metadata of the files (.deb, .dsc, ...) of the package.""" name = attr.ib(type=str) version = attr.ib(type=str)
[docs] @classmethod def from_metadata(cls, a_metadata: Dict[str, Any], url: str) -> "DebianPackageInfo": return cls( url=url, filename=None, raw_info=a_metadata, files={ file_name: DebianFileMetadata(**file_metadata) for (file_name, file_metadata) in a_metadata.get("files", {}).items() }, name=a_metadata["name"], version=a_metadata["version"], )
[docs]@attr.s class IntrinsicPackageMetadata: """Metadata extracted from a package's .dsc file.""" name = attr.ib(type=str) version = attr.ib(type=str) changelog = attr.ib(type=DebianPackageChangelog) maintainers = attr.ib(type=List[Dict[str, str]]) """A list of dicts with fields like, model.Person, except they are str instead of bytes, and 'email' is optional."""
[docs]class DebianLoader(PackageLoader[DebianPackageInfo]): """Load debian origins into swh archive. """ visit_type = "deb" def __init__(self, url: str, date: str, packages: Mapping[str, Any]): """Debian Loader implementation. Args: url: Origin url (e.g. deb://Debian/packages/cicero) date: Ignored packages: versioned packages and associated artifacts, example:: { 'stretch/contrib/0.7.2-3': { 'name': 'cicero', 'version': '0.7.2-3' 'files': { 'cicero_0.7.2-3.diff.gz': { 'md5sum': 'a93661b6a48db48d59ba7d26796fc9ce', 'name': 'cicero_0.7.2-3.diff.gz', 'sha256': 'f039c9642fe15c75bed5254315e2a29f...', 'size': 3964, 'uri': 'http://d.d.o/cicero_0.7.2-3.diff.gz', }, 'cicero_0.7.2-3.dsc': { 'md5sum': 'd5dac83eb9cfc9bb52a15eb618b4670a', 'name': 'cicero_0.7.2-3.dsc', 'sha256': '35b7f1048010c67adfd8d70e4961aefb...', 'size': 1864, 'uri': 'http://d.d.o/cicero_0.7.2-3.dsc', }, 'cicero_0.7.2.orig.tar.gz': { 'md5sum': '4353dede07c5728319ba7f5595a7230a', 'name': 'cicero_0.7.2.orig.tar.gz', 'sha256': '63f40f2436ea9f67b44e2d4bd669dbab...', 'size': 96527, 'uri': 'http://d.d.o/cicero_0.7.2.orig.tar.gz', } }, }, # ... } """ super().__init__(url=url) self.packages = packages
[docs] def get_versions(self) -> Sequence[str]: """Returns the keys of the packages input (e.g. stretch/contrib/0.7.2-3, etc...) """ return list(self.packages.keys())
[docs] def get_package_info(self, version: str) -> Iterator[Tuple[str, DebianPackageInfo]]: meta = self.packages[version] p_info = DebianPackageInfo.from_metadata(meta, url=self.url) yield release_name(version), p_info
[docs] def resolve_revision_from( self, known_package_artifacts: Mapping, p_info: DebianPackageInfo ) -> Optional[bytes]: return resolve_revision_from(known_package_artifacts, p_info)
[docs] def download_package( self, p_info: DebianPackageInfo, tmpdir: str ) -> List[Tuple[str, Mapping]]: """Contrary to other package loaders (1 package, 1 artifact), `p_info.files` represents the package's datafiles set to fetch: - <package-version>.orig.tar.gz - <package-version>.dsc - <package-version>.diff.gz This is delegated to the `download_package` function. """ all_hashes = download_package(p_info, tmpdir) logger.debug("all_hashes: %s", all_hashes) res = [] for hashes in all_hashes.values(): res.append((tmpdir, hashes)) logger.debug("res: %s", res) return res
[docs] def uncompress( self, dl_artifacts: List[Tuple[str, Mapping[str, Any]]], dest: str ) -> str: logger.debug("dl_artifacts: %s", dl_artifacts) return extract_package(dl_artifacts, dest=dest)
[docs] def build_revision( self, p_info: DebianPackageInfo, uncompressed_path: str, directory: Sha1Git ) -> Optional[Revision]: dsc_url, dsc_name = dsc_information(p_info) if not dsc_name: raise ValueError("dsc name for url %s should not be None" % dsc_url) dsc_path = path.join(path.dirname(uncompressed_path), dsc_name) intrinsic_metadata = get_intrinsic_package_metadata( p_info, dsc_path, uncompressed_path ) logger.debug("intrinsic_metadata: %s", intrinsic_metadata) logger.debug("p_info: %s", p_info) msg = "Synthetic revision for Debian source package %s version %s" % ( p_info.name, p_info.version, ) author = prepare_person(intrinsic_metadata.changelog.person) date = TimestampWithTimezone.from_iso8601(intrinsic_metadata.changelog.date) # inspired from swh.loader.debian.converters.package_metadata_to_revision # noqa return Revision( type=RevisionType.DSC, message=msg.encode("utf-8"), author=author, date=date, committer=author, committer_date=date, parents=(), directory=directory, synthetic=True, metadata={ "intrinsic": {"tool": "dsc", "raw": attr.asdict(intrinsic_metadata),}, "extrinsic": { "provider": dsc_url, "when": self.visit_date.isoformat(), "raw": p_info.raw_info, }, }, )
[docs]def resolve_revision_from( known_package_artifacts: Mapping, p_info: DebianPackageInfo ) -> Optional[bytes]: """Given known package artifacts (resolved from the snapshot of previous visit) and the new artifact to fetch, try to solve the corresponding revision. """ artifacts_to_fetch = p_info.files if not artifacts_to_fetch: return None def to_set(data: DebianPackageInfo) -> FrozenSet[Tuple[str, str, int]]: return frozenset( (name, meta.sha256, meta.size) for name, meta in data.files.items() ) # what we want to avoid downloading back if we have them already set_new_artifacts = to_set(p_info) known_artifacts_revision_id = {} for rev_id, known_artifacts in known_package_artifacts.items(): extrinsic = known_artifacts.get("extrinsic") if not extrinsic: continue s = to_set(DebianPackageInfo.from_metadata(extrinsic["raw"], url=p_info.url)) known_artifacts_revision_id[s] = rev_id return known_artifacts_revision_id.get(set_new_artifacts)
[docs]def uid_to_person(uid: str) -> Dict[str, str]: """Convert an uid to a person suitable for insertion. Args: uid: an uid of the form "Name <email@ddress>" Returns: a dictionary with the following keys: - name: the name associated to the uid - email: the mail associated to the uid - fullname: the actual uid input """ logger.debug("uid: %s", uid) ret = { "name": "", "email": "", "fullname": uid, } name, mail = email.utils.parseaddr(uid) if name and email: ret["name"] = name ret["email"] = mail else: ret["name"] = uid return ret
[docs]def prepare_person(person: Mapping[str, str]) -> Person: """Prepare person for swh serialization... Args: A person dict Returns: A person ready for storage """ return Person.from_dict( {key: value.encode("utf-8") for (key, value) in person.items()} )
[docs]def download_package(p_info: DebianPackageInfo, tmpdir: Any) -> Mapping[str, Any]: """Fetch a source package in a temporary directory and check the checksums for all files. Args: p_info: Information on a package tmpdir: Where to download and extract the files to ingest Returns: Dict of swh hashes per filename key """ all_hashes = {} for filename, fileinfo in p_info.files.items(): uri = fileinfo.uri logger.debug("fileinfo: %s", fileinfo) extrinsic_hashes = {"sha256": fileinfo.sha256} logger.debug("extrinsic_hashes(%s): %s", filename, extrinsic_hashes) filepath, hashes = download( uri, dest=tmpdir, filename=filename, hashes=extrinsic_hashes ) all_hashes[filename] = hashes logger.debug("all_hashes: %s", all_hashes) return all_hashes
[docs]def dsc_information(p_info: DebianPackageInfo) -> Tuple[Optional[str], Optional[str]]: """Retrieve dsc information from a package. Args: p_info: Package metadata information Returns: Tuple of dsc file's uri, dsc's full disk path """ dsc_name = None dsc_url = None for filename, fileinfo in p_info.files.items(): if filename.endswith(".dsc"): if dsc_name: raise ValueError( "Package %s_%s references several dsc files." % (p_info.name, p_info.version) ) dsc_url = fileinfo.uri dsc_name = filename return dsc_url, dsc_name
[docs]def extract_package(dl_artifacts: List[Tuple[str, Mapping]], dest: str) -> str: """Extract a Debian source package to a given directory. Note that after extraction the target directory will be the root of the extracted package, rather than containing it. Args: package: package information dictionary dest: directory where the package files are stored Returns: Package extraction directory """ a_path = dl_artifacts[0][0] logger.debug("dl_artifacts: %s", dl_artifacts) for _, hashes in dl_artifacts: logger.debug("hashes: %s", hashes) filename = hashes["filename"] if filename.endswith(".dsc"): dsc_name = filename break dsc_path = path.join(a_path, dsc_name) destdir = path.join(dest, "extracted") logfile = path.join(dest, "extract.log") logger.debug( "extract Debian source package %s in %s" % (dsc_path, destdir), extra={"swh_type": "deb_extract", "swh_dsc": dsc_path, "swh_destdir": destdir,}, ) cmd = [ "dpkg-source", "--no-copy", "--no-check", "--ignore-bad-version", "-x", dsc_path, destdir, ] try: with open(logfile, "w") as stdout: subprocess.check_call(cmd, stdout=stdout, stderr=subprocess.STDOUT) except subprocess.CalledProcessError as e: logdata = open(logfile, "r").read() raise ValueError( "dpkg-source exited with code %s: %s" % (e.returncode, logdata) ) from None return destdir
[docs]def get_intrinsic_package_metadata( p_info: DebianPackageInfo, dsc_path: str, extracted_path: str ) -> IntrinsicPackageMetadata: """Get the package metadata from the source package at dsc_path, extracted in extracted_path. Args: p_info: the package information dsc_path: path to the package's dsc file extracted_path: the path where the package got extracted Returns: dict: a dictionary with the following keys: - history: list of (package_name, package_version) tuples parsed from the package changelog """ with open(dsc_path, "rb") as dsc: parsed_dsc = Dsc(dsc) # Parse the changelog to retrieve the rest of the package information changelog_path = path.join(extracted_path, "debian/changelog") with open(changelog_path, "rb") as changelog_file: try: parsed_changelog = Changelog(changelog_file) except UnicodeDecodeError: logger.warning( "Unknown encoding for changelog %s," " falling back to iso" % changelog_path, extra={ "swh_type": "deb_changelog_encoding", "swh_name": p_info.name, "swh_version": str(p_info.version), "swh_changelog": changelog_path, }, ) # need to reset as Changelog scrolls to the end of the file changelog_file.seek(0) parsed_changelog = Changelog(changelog_file, encoding="iso-8859-15") history: List[Tuple[str, str]] = [] for block in parsed_changelog: assert block.package is not None history.append((block.package, str(block.version))) changelog = DebianPackageChangelog( person=uid_to_person(parsed_changelog.author), date=parse_date(parsed_changelog.date).isoformat(), history=history[1:], ) maintainers = [ uid_to_person(parsed_dsc["Maintainer"]), ] maintainers.extend( uid_to_person(person) for person in UPLOADERS_SPLIT.split(parsed_dsc.get("Uploaders", "")) ) return IntrinsicPackageMetadata( name=p_info.name, version=str(p_info.version), changelog=changelog, maintainers=maintainers, )