731 lines
28 KiB
Python
731 lines
28 KiB
Python
"""Prepares a distribution for installation
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"""
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# The following comment should be removed at some point in the future.
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# mypy: strict-optional=False
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import mimetypes
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import os
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import shutil
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from pathlib import Path
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from typing import Dict, Iterable, List, Optional
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from pip._vendor.packaging.utils import canonicalize_name
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from pip._internal.distributions import make_distribution_for_install_requirement
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from pip._internal.distributions.installed import InstalledDistribution
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from pip._internal.exceptions import (
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DirectoryUrlHashUnsupported,
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HashMismatch,
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HashUnpinned,
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InstallationError,
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MetadataInconsistent,
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NetworkConnectionError,
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VcsHashUnsupported,
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)
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from pip._internal.index.package_finder import PackageFinder
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from pip._internal.metadata import BaseDistribution, get_metadata_distribution
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from pip._internal.models.direct_url import ArchiveInfo
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from pip._internal.models.link import Link
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from pip._internal.models.wheel import Wheel
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from pip._internal.network.download import BatchDownloader, Downloader
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from pip._internal.network.lazy_wheel import (
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HTTPRangeRequestUnsupported,
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dist_from_wheel_url,
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)
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from pip._internal.network.session import PipSession
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from pip._internal.operations.build.build_tracker import BuildTracker
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from pip._internal.req.req_install import InstallRequirement
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from pip._internal.utils._log import getLogger
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from pip._internal.utils.direct_url_helpers import (
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direct_url_for_editable,
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direct_url_from_link,
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)
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from pip._internal.utils.hashes import Hashes, MissingHashes
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from pip._internal.utils.logging import indent_log
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from pip._internal.utils.misc import (
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display_path,
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hash_file,
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hide_url,
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redact_auth_from_requirement,
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)
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from pip._internal.utils.temp_dir import TempDirectory
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from pip._internal.utils.unpacking import unpack_file
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from pip._internal.vcs import vcs
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logger = getLogger(__name__)
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def _get_prepared_distribution(
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req: InstallRequirement,
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build_tracker: BuildTracker,
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finder: PackageFinder,
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build_isolation: bool,
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check_build_deps: bool,
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) -> BaseDistribution:
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"""Prepare a distribution for installation."""
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abstract_dist = make_distribution_for_install_requirement(req)
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tracker_id = abstract_dist.build_tracker_id
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if tracker_id is not None:
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with build_tracker.track(req, tracker_id):
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abstract_dist.prepare_distribution_metadata(
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finder, build_isolation, check_build_deps
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)
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return abstract_dist.get_metadata_distribution()
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def unpack_vcs_link(link: Link, location: str, verbosity: int) -> None:
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vcs_backend = vcs.get_backend_for_scheme(link.scheme)
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assert vcs_backend is not None
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vcs_backend.unpack(location, url=hide_url(link.url), verbosity=verbosity)
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class File:
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def __init__(self, path: str, content_type: Optional[str]) -> None:
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self.path = path
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if content_type is None:
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self.content_type = mimetypes.guess_type(path)[0]
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else:
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self.content_type = content_type
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def get_http_url(
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link: Link,
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download: Downloader,
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download_dir: Optional[str] = None,
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hashes: Optional[Hashes] = None,
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) -> File:
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temp_dir = TempDirectory(kind="unpack", globally_managed=True)
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# If a download dir is specified, is the file already downloaded there?
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already_downloaded_path = None
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if download_dir:
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already_downloaded_path = _check_download_dir(link, download_dir, hashes)
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if already_downloaded_path:
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from_path = already_downloaded_path
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content_type = None
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else:
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# let's download to a tmp dir
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from_path, content_type = download(link, temp_dir.path)
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if hashes:
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hashes.check_against_path(from_path)
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return File(from_path, content_type)
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def get_file_url(
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link: Link, download_dir: Optional[str] = None, hashes: Optional[Hashes] = None
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) -> File:
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"""Get file and optionally check its hash."""
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# If a download dir is specified, is the file already there and valid?
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already_downloaded_path = None
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if download_dir:
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already_downloaded_path = _check_download_dir(link, download_dir, hashes)
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if already_downloaded_path:
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from_path = already_downloaded_path
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else:
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from_path = link.file_path
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# If --require-hashes is off, `hashes` is either empty, the
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# link's embedded hash, or MissingHashes; it is required to
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# match. If --require-hashes is on, we are satisfied by any
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# hash in `hashes` matching: a URL-based or an option-based
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# one; no internet-sourced hash will be in `hashes`.
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if hashes:
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hashes.check_against_path(from_path)
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return File(from_path, None)
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def unpack_url(
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link: Link,
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location: str,
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download: Downloader,
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verbosity: int,
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download_dir: Optional[str] = None,
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hashes: Optional[Hashes] = None,
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) -> Optional[File]:
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"""Unpack link into location, downloading if required.
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:param hashes: A Hashes object, one of whose embedded hashes must match,
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or HashMismatch will be raised. If the Hashes is empty, no matches are
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required, and unhashable types of requirements (like VCS ones, which
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would ordinarily raise HashUnsupported) are allowed.
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"""
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# non-editable vcs urls
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if link.is_vcs:
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unpack_vcs_link(link, location, verbosity=verbosity)
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return None
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assert not link.is_existing_dir()
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# file urls
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if link.is_file:
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file = get_file_url(link, download_dir, hashes=hashes)
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# http urls
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else:
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file = get_http_url(
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link,
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download,
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download_dir,
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hashes=hashes,
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)
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# unpack the archive to the build dir location. even when only downloading
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# archives, they have to be unpacked to parse dependencies, except wheels
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if not link.is_wheel:
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unpack_file(file.path, location, file.content_type)
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return file
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def _check_download_dir(
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link: Link,
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download_dir: str,
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hashes: Optional[Hashes],
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warn_on_hash_mismatch: bool = True,
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) -> Optional[str]:
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"""Check download_dir for previously downloaded file with correct hash
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If a correct file is found return its path else None
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"""
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download_path = os.path.join(download_dir, link.filename)
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if not os.path.exists(download_path):
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return None
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# If already downloaded, does its hash match?
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logger.info("File was already downloaded %s", download_path)
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if hashes:
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try:
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hashes.check_against_path(download_path)
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except HashMismatch:
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if warn_on_hash_mismatch:
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logger.warning(
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"Previously-downloaded file %s has bad hash. Re-downloading.",
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download_path,
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)
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os.unlink(download_path)
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return None
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return download_path
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class RequirementPreparer:
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"""Prepares a Requirement"""
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def __init__(
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self,
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build_dir: str,
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download_dir: Optional[str],
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src_dir: str,
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build_isolation: bool,
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check_build_deps: bool,
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build_tracker: BuildTracker,
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session: PipSession,
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progress_bar: str,
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finder: PackageFinder,
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require_hashes: bool,
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use_user_site: bool,
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lazy_wheel: bool,
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verbosity: int,
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legacy_resolver: bool,
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) -> None:
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super().__init__()
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self.src_dir = src_dir
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self.build_dir = build_dir
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self.build_tracker = build_tracker
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self._session = session
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self._download = Downloader(session, progress_bar)
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self._batch_download = BatchDownloader(session, progress_bar)
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self.finder = finder
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# Where still-packed archives should be written to. If None, they are
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# not saved, and are deleted immediately after unpacking.
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self.download_dir = download_dir
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# Is build isolation allowed?
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self.build_isolation = build_isolation
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# Should check build dependencies?
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self.check_build_deps = check_build_deps
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# Should hash-checking be required?
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self.require_hashes = require_hashes
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# Should install in user site-packages?
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self.use_user_site = use_user_site
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# Should wheels be downloaded lazily?
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self.use_lazy_wheel = lazy_wheel
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# How verbose should underlying tooling be?
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self.verbosity = verbosity
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# Are we using the legacy resolver?
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self.legacy_resolver = legacy_resolver
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# Memoized downloaded files, as mapping of url: path.
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self._downloaded: Dict[str, str] = {}
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# Previous "header" printed for a link-based InstallRequirement
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self._previous_requirement_header = ("", "")
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def _log_preparing_link(self, req: InstallRequirement) -> None:
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"""Provide context for the requirement being prepared."""
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if req.link.is_file and not req.is_wheel_from_cache:
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message = "Processing %s"
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information = str(display_path(req.link.file_path))
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else:
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message = "Collecting %s"
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information = redact_auth_from_requirement(req.req) if req.req else str(req)
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# If we used req.req, inject requirement source if available (this
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# would already be included if we used req directly)
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if req.req and req.comes_from:
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if isinstance(req.comes_from, str):
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comes_from: Optional[str] = req.comes_from
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else:
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comes_from = req.comes_from.from_path()
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if comes_from:
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information += f" (from {comes_from})"
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if (message, information) != self._previous_requirement_header:
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self._previous_requirement_header = (message, information)
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logger.info(message, information)
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if req.is_wheel_from_cache:
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with indent_log():
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logger.info("Using cached %s", req.link.filename)
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def _ensure_link_req_src_dir(
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self, req: InstallRequirement, parallel_builds: bool
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) -> None:
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"""Ensure source_dir of a linked InstallRequirement."""
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# Since source_dir is only set for editable requirements.
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if req.link.is_wheel:
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# We don't need to unpack wheels, so no need for a source
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# directory.
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return
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assert req.source_dir is None
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if req.link.is_existing_dir():
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# build local directories in-tree
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req.source_dir = req.link.file_path
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return
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# We always delete unpacked sdists after pip runs.
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req.ensure_has_source_dir(
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self.build_dir,
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autodelete=True,
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parallel_builds=parallel_builds,
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)
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req.ensure_pristine_source_checkout()
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def _get_linked_req_hashes(self, req: InstallRequirement) -> Hashes:
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# By the time this is called, the requirement's link should have
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# been checked so we can tell what kind of requirements req is
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# and raise some more informative errors than otherwise.
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# (For example, we can raise VcsHashUnsupported for a VCS URL
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# rather than HashMissing.)
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if not self.require_hashes:
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return req.hashes(trust_internet=True)
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# We could check these first 2 conditions inside unpack_url
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# and save repetition of conditions, but then we would
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# report less-useful error messages for unhashable
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# requirements, complaining that there's no hash provided.
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if req.link.is_vcs:
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raise VcsHashUnsupported()
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if req.link.is_existing_dir():
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raise DirectoryUrlHashUnsupported()
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# Unpinned packages are asking for trouble when a new version
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# is uploaded. This isn't a security check, but it saves users
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# a surprising hash mismatch in the future.
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# file:/// URLs aren't pinnable, so don't complain about them
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# not being pinned.
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if not req.is_direct and not req.is_pinned:
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raise HashUnpinned()
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# If known-good hashes are missing for this requirement,
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# shim it with a facade object that will provoke hash
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# computation and then raise a HashMissing exception
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# showing the user what the hash should be.
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return req.hashes(trust_internet=False) or MissingHashes()
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def _fetch_metadata_only(
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self,
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req: InstallRequirement,
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) -> Optional[BaseDistribution]:
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if self.legacy_resolver:
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logger.debug(
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"Metadata-only fetching is not used in the legacy resolver",
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)
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return None
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if self.require_hashes:
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logger.debug(
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"Metadata-only fetching is not used as hash checking is required",
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)
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return None
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# Try PEP 658 metadata first, then fall back to lazy wheel if unavailable.
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return self._fetch_metadata_using_link_data_attr(
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req
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) or self._fetch_metadata_using_lazy_wheel(req.link)
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def _fetch_metadata_using_link_data_attr(
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self,
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req: InstallRequirement,
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) -> Optional[BaseDistribution]:
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"""Fetch metadata from the data-dist-info-metadata attribute, if possible."""
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# (1) Get the link to the metadata file, if provided by the backend.
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metadata_link = req.link.metadata_link()
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if metadata_link is None:
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return None
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assert req.req is not None
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logger.verbose(
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"Obtaining dependency information for %s from %s",
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req.req,
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metadata_link,
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)
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# (2) Download the contents of the METADATA file, separate from the dist itself.
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metadata_file = get_http_url(
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metadata_link,
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self._download,
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hashes=metadata_link.as_hashes(),
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)
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with open(metadata_file.path, "rb") as f:
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metadata_contents = f.read()
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# (3) Generate a dist just from those file contents.
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metadata_dist = get_metadata_distribution(
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metadata_contents,
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req.link.filename,
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req.req.name,
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)
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# (4) Ensure the Name: field from the METADATA file matches the name from the
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# install requirement.
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#
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# NB: raw_name will fall back to the name from the install requirement if
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# the Name: field is not present, but it's noted in the raw_name docstring
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# that that should NEVER happen anyway.
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if canonicalize_name(metadata_dist.raw_name) != canonicalize_name(req.req.name):
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raise MetadataInconsistent(
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req, "Name", req.req.name, metadata_dist.raw_name
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)
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return metadata_dist
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def _fetch_metadata_using_lazy_wheel(
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self,
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link: Link,
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) -> Optional[BaseDistribution]:
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"""Fetch metadata using lazy wheel, if possible."""
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# --use-feature=fast-deps must be provided.
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if not self.use_lazy_wheel:
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return None
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if link.is_file or not link.is_wheel:
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logger.debug(
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"Lazy wheel is not used as %r does not point to a remote wheel",
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link,
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)
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return None
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wheel = Wheel(link.filename)
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name = canonicalize_name(wheel.name)
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logger.info(
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"Obtaining dependency information from %s %s",
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name,
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wheel.version,
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)
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url = link.url.split("#", 1)[0]
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try:
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return dist_from_wheel_url(name, url, self._session)
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except HTTPRangeRequestUnsupported:
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logger.debug("%s does not support range requests", url)
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return None
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|
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def _complete_partial_requirements(
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self,
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partially_downloaded_reqs: Iterable[InstallRequirement],
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parallel_builds: bool = False,
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) -> None:
|
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"""Download any requirements which were only fetched by metadata."""
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# Download to a temporary directory. These will be copied over as
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# needed for downstream 'download', 'wheel', and 'install' commands.
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temp_dir = TempDirectory(kind="unpack", globally_managed=True).path
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|
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# Map each link to the requirement that owns it. This allows us to set
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# `req.local_file_path` on the appropriate requirement after passing
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# all the links at once into BatchDownloader.
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links_to_fully_download: Dict[Link, InstallRequirement] = {}
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for req in partially_downloaded_reqs:
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assert req.link
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links_to_fully_download[req.link] = req
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batch_download = self._batch_download(
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links_to_fully_download.keys(),
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temp_dir,
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)
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for link, (filepath, _) in batch_download:
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logger.debug("Downloading link %s to %s", link, filepath)
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req = links_to_fully_download[link]
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# Record the downloaded file path so wheel reqs can extract a Distribution
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# in .get_dist().
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req.local_file_path = filepath
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# Record that the file is downloaded so we don't do it again in
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# _prepare_linked_requirement().
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self._downloaded[req.link.url] = filepath
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# If this is an sdist, we need to unpack it after downloading, but the
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# .source_dir won't be set up until we are in _prepare_linked_requirement().
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# Add the downloaded archive to the install requirement to unpack after
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# preparing the source dir.
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if not req.is_wheel:
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req.needs_unpacked_archive(Path(filepath))
|
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|
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# This step is necessary to ensure all lazy wheels are processed
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# successfully by the 'download', 'wheel', and 'install' commands.
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for req in partially_downloaded_reqs:
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self._prepare_linked_requirement(req, parallel_builds)
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|
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def prepare_linked_requirement(
|
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self, req: InstallRequirement, parallel_builds: bool = False
|
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) -> BaseDistribution:
|
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"""Prepare a requirement to be obtained from req.link."""
|
|
assert req.link
|
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self._log_preparing_link(req)
|
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with indent_log():
|
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# Check if the relevant file is already available
|
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# in the download directory
|
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file_path = None
|
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if self.download_dir is not None and req.link.is_wheel:
|
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hashes = self._get_linked_req_hashes(req)
|
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file_path = _check_download_dir(
|
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req.link,
|
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self.download_dir,
|
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hashes,
|
|
# When a locally built wheel has been found in cache, we don't warn
|
|
# about re-downloading when the already downloaded wheel hash does
|
|
# not match. This is because the hash must be checked against the
|
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# original link, not the cached link. It that case the already
|
|
# downloaded file will be removed and re-fetched from cache (which
|
|
# implies a hash check against the cache entry's origin.json).
|
|
warn_on_hash_mismatch=not req.is_wheel_from_cache,
|
|
)
|
|
|
|
if file_path is not None:
|
|
# The file is already available, so mark it as downloaded
|
|
self._downloaded[req.link.url] = file_path
|
|
else:
|
|
# The file is not available, attempt to fetch only metadata
|
|
metadata_dist = self._fetch_metadata_only(req)
|
|
if metadata_dist is not None:
|
|
req.needs_more_preparation = True
|
|
return metadata_dist
|
|
|
|
# None of the optimizations worked, fully prepare the requirement
|
|
return self._prepare_linked_requirement(req, parallel_builds)
|
|
|
|
def prepare_linked_requirements_more(
|
|
self, reqs: Iterable[InstallRequirement], parallel_builds: bool = False
|
|
) -> None:
|
|
"""Prepare linked requirements more, if needed."""
|
|
reqs = [req for req in reqs if req.needs_more_preparation]
|
|
for req in reqs:
|
|
# Determine if any of these requirements were already downloaded.
|
|
if self.download_dir is not None and req.link.is_wheel:
|
|
hashes = self._get_linked_req_hashes(req)
|
|
file_path = _check_download_dir(req.link, self.download_dir, hashes)
|
|
if file_path is not None:
|
|
self._downloaded[req.link.url] = file_path
|
|
req.needs_more_preparation = False
|
|
|
|
# Prepare requirements we found were already downloaded for some
|
|
# reason. The other downloads will be completed separately.
|
|
partially_downloaded_reqs: List[InstallRequirement] = []
|
|
for req in reqs:
|
|
if req.needs_more_preparation:
|
|
partially_downloaded_reqs.append(req)
|
|
else:
|
|
self._prepare_linked_requirement(req, parallel_builds)
|
|
|
|
# TODO: separate this part out from RequirementPreparer when the v1
|
|
# resolver can be removed!
|
|
self._complete_partial_requirements(
|
|
partially_downloaded_reqs,
|
|
parallel_builds=parallel_builds,
|
|
)
|
|
|
|
def _prepare_linked_requirement(
|
|
self, req: InstallRequirement, parallel_builds: bool
|
|
) -> BaseDistribution:
|
|
assert req.link
|
|
link = req.link
|
|
|
|
hashes = self._get_linked_req_hashes(req)
|
|
|
|
if hashes and req.is_wheel_from_cache:
|
|
assert req.download_info is not None
|
|
assert link.is_wheel
|
|
assert link.is_file
|
|
# We need to verify hashes, and we have found the requirement in the cache
|
|
# of locally built wheels.
|
|
if (
|
|
isinstance(req.download_info.info, ArchiveInfo)
|
|
and req.download_info.info.hashes
|
|
and hashes.has_one_of(req.download_info.info.hashes)
|
|
):
|
|
# At this point we know the requirement was built from a hashable source
|
|
# artifact, and we verified that the cache entry's hash of the original
|
|
# artifact matches one of the hashes we expect. We don't verify hashes
|
|
# against the cached wheel, because the wheel is not the original.
|
|
hashes = None
|
|
else:
|
|
logger.warning(
|
|
"The hashes of the source archive found in cache entry "
|
|
"don't match, ignoring cached built wheel "
|
|
"and re-downloading source."
|
|
)
|
|
req.link = req.cached_wheel_source_link
|
|
link = req.link
|
|
|
|
self._ensure_link_req_src_dir(req, parallel_builds)
|
|
|
|
if link.is_existing_dir():
|
|
local_file = None
|
|
elif link.url not in self._downloaded:
|
|
try:
|
|
local_file = unpack_url(
|
|
link,
|
|
req.source_dir,
|
|
self._download,
|
|
self.verbosity,
|
|
self.download_dir,
|
|
hashes,
|
|
)
|
|
except NetworkConnectionError as exc:
|
|
raise InstallationError(
|
|
f"Could not install requirement {req} because of HTTP "
|
|
f"error {exc} for URL {link}"
|
|
)
|
|
else:
|
|
file_path = self._downloaded[link.url]
|
|
if hashes:
|
|
hashes.check_against_path(file_path)
|
|
local_file = File(file_path, content_type=None)
|
|
|
|
# If download_info is set, we got it from the wheel cache.
|
|
if req.download_info is None:
|
|
# Editables don't go through this function (see
|
|
# prepare_editable_requirement).
|
|
assert not req.editable
|
|
req.download_info = direct_url_from_link(link, req.source_dir)
|
|
# Make sure we have a hash in download_info. If we got it as part of the
|
|
# URL, it will have been verified and we can rely on it. Otherwise we
|
|
# compute it from the downloaded file.
|
|
# FIXME: https://github.com/pypa/pip/issues/11943
|
|
if (
|
|
isinstance(req.download_info.info, ArchiveInfo)
|
|
and not req.download_info.info.hashes
|
|
and local_file
|
|
):
|
|
hash = hash_file(local_file.path)[0].hexdigest()
|
|
# We populate info.hash for backward compatibility.
|
|
# This will automatically populate info.hashes.
|
|
req.download_info.info.hash = f"sha256={hash}"
|
|
|
|
# For use in later processing,
|
|
# preserve the file path on the requirement.
|
|
if local_file:
|
|
req.local_file_path = local_file.path
|
|
|
|
dist = _get_prepared_distribution(
|
|
req,
|
|
self.build_tracker,
|
|
self.finder,
|
|
self.build_isolation,
|
|
self.check_build_deps,
|
|
)
|
|
return dist
|
|
|
|
def save_linked_requirement(self, req: InstallRequirement) -> None:
|
|
assert self.download_dir is not None
|
|
assert req.link is not None
|
|
link = req.link
|
|
if link.is_vcs or (link.is_existing_dir() and req.editable):
|
|
# Make a .zip of the source_dir we already created.
|
|
req.archive(self.download_dir)
|
|
return
|
|
|
|
if link.is_existing_dir():
|
|
logger.debug(
|
|
"Not copying link to destination directory "
|
|
"since it is a directory: %s",
|
|
link,
|
|
)
|
|
return
|
|
if req.local_file_path is None:
|
|
# No distribution was downloaded for this requirement.
|
|
return
|
|
|
|
download_location = os.path.join(self.download_dir, link.filename)
|
|
if not os.path.exists(download_location):
|
|
shutil.copy(req.local_file_path, download_location)
|
|
download_path = display_path(download_location)
|
|
logger.info("Saved %s", download_path)
|
|
|
|
def prepare_editable_requirement(
|
|
self,
|
|
req: InstallRequirement,
|
|
) -> BaseDistribution:
|
|
"""Prepare an editable requirement."""
|
|
assert req.editable, "cannot prepare a non-editable req as editable"
|
|
|
|
logger.info("Obtaining %s", req)
|
|
|
|
with indent_log():
|
|
if self.require_hashes:
|
|
raise InstallationError(
|
|
f"The editable requirement {req} cannot be installed when "
|
|
"requiring hashes, because there is no single file to "
|
|
"hash."
|
|
)
|
|
req.ensure_has_source_dir(self.src_dir)
|
|
req.update_editable()
|
|
assert req.source_dir
|
|
req.download_info = direct_url_for_editable(req.unpacked_source_directory)
|
|
|
|
dist = _get_prepared_distribution(
|
|
req,
|
|
self.build_tracker,
|
|
self.finder,
|
|
self.build_isolation,
|
|
self.check_build_deps,
|
|
)
|
|
|
|
req.check_if_exists(self.use_user_site)
|
|
|
|
return dist
|
|
|
|
def prepare_installed_requirement(
|
|
self,
|
|
req: InstallRequirement,
|
|
skip_reason: str,
|
|
) -> BaseDistribution:
|
|
"""Prepare an already-installed requirement."""
|
|
assert req.satisfied_by, "req should have been satisfied but isn't"
|
|
assert skip_reason is not None, (
|
|
"did not get skip reason skipped but req.satisfied_by "
|
|
f"is set to {req.satisfied_by}"
|
|
)
|
|
logger.info(
|
|
"Requirement %s: %s (%s)", skip_reason, req, req.satisfied_by.version
|
|
)
|
|
with indent_log():
|
|
if self.require_hashes:
|
|
logger.debug(
|
|
"Since it is already installed, we are trusting this "
|
|
"package without checking its hash. To ensure a "
|
|
"completely repeatable environment, install into an "
|
|
"empty virtualenv."
|
|
)
|
|
return InstalledDistribution(req).get_metadata_distribution()
|