668 lines
24 KiB
Python
668 lines
24 KiB
Python
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"""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 logging
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import mimetypes
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import os
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import shutil
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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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PreviousBuildDirError,
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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.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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is_installable_dir,
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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 = logging.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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with build_tracker.track(req):
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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, download_dir: str, hashes: Optional[Hashes]
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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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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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) -> 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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# 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.original_link_is_in_wheel_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 = str(req.req or req)
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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.original_link_is_in_wheel_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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# If a checkout exists, it's unwise to keep going. version
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# inconsistencies are logged later, but do not fail the
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# installation.
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# FIXME: this won't upgrade when there's an existing
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# package unpacked in `req.source_dir`
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# TODO: this check is now probably dead code
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if is_installable_dir(req.source_dir):
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raise PreviousBuildDirError(
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"pip can't proceed with requirements '{}' due to a"
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"pre-existing build directory ({}). This is likely "
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"due to a previous installation that failed . pip is "
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"being responsible and not assuming it can delete this. "
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"Please delete it and try again.".format(req, req.source_dir)
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)
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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 req.original_link is None 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.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.info(
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|
"Obtaining dependency information for %s from %s",
|
||
|
|
req.req,
|
||
|
|
metadata_link,
|
||
|
|
)
|
||
|
|
# (2) Download the contents of the METADATA file, separate from the dist itself.
|
||
|
|
metadata_file = get_http_url(
|
||
|
|
metadata_link,
|
||
|
|
self._download,
|
||
|
|
hashes=metadata_link.as_hashes(),
|
||
|
|
)
|
||
|
|
with open(metadata_file.path, "rb") as f:
|
||
|
|
metadata_contents = f.read()
|
||
|
|
# (3) Generate a dist just from those file contents.
|
||
|
|
metadata_dist = get_metadata_distribution(
|
||
|
|
metadata_contents,
|
||
|
|
req.link.filename,
|
||
|
|
req.req.name,
|
||
|
|
)
|
||
|
|
# (4) Ensure the Name: field from the METADATA file matches the name from the
|
||
|
|
# install requirement.
|
||
|
|
#
|
||
|
|
# NB: raw_name will fall back to the name from the install requirement if
|
||
|
|
# the Name: field is not present, but it's noted in the raw_name docstring
|
||
|
|
# that that should NEVER happen anyway.
|
||
|
|
if metadata_dist.raw_name != req.req.name:
|
||
|
|
raise MetadataInconsistent(
|
||
|
|
req, "Name", req.req.name, metadata_dist.raw_name
|
||
|
|
)
|
||
|
|
return metadata_dist
|
||
|
|
|
||
|
|
def _fetch_metadata_using_lazy_wheel(
|
||
|
|
self,
|
||
|
|
link: Link,
|
||
|
|
) -> Optional[BaseDistribution]:
|
||
|
|
"""Fetch metadata using lazy wheel, if possible."""
|
||
|
|
# --use-feature=fast-deps must be provided.
|
||
|
|
if not self.use_lazy_wheel:
|
||
|
|
return None
|
||
|
|
if link.is_file or not link.is_wheel:
|
||
|
|
logger.debug(
|
||
|
|
"Lazy wheel is not used as %r does not point to a remote wheel",
|
||
|
|
link,
|
||
|
|
)
|
||
|
|
return None
|
||
|
|
|
||
|
|
wheel = Wheel(link.filename)
|
||
|
|
name = canonicalize_name(wheel.name)
|
||
|
|
logger.info(
|
||
|
|
"Obtaining dependency information from %s %s",
|
||
|
|
name,
|
||
|
|
wheel.version,
|
||
|
|
)
|
||
|
|
url = link.url.split("#", 1)[0]
|
||
|
|
try:
|
||
|
|
return dist_from_wheel_url(name, url, self._session)
|
||
|
|
except HTTPRangeRequestUnsupported:
|
||
|
|
logger.debug("%s does not support range requests", url)
|
||
|
|
return None
|
||
|
|
|
||
|
|
def _complete_partial_requirements(
|
||
|
|
self,
|
||
|
|
partially_downloaded_reqs: Iterable[InstallRequirement],
|
||
|
|
parallel_builds: bool = False,
|
||
|
|
) -> None:
|
||
|
|
"""Download any requirements which were only fetched by metadata."""
|
||
|
|
# Download to a temporary directory. These will be copied over as
|
||
|
|
# needed for downstream 'download', 'wheel', and 'install' commands.
|
||
|
|
temp_dir = TempDirectory(kind="unpack", globally_managed=True).path
|
||
|
|
|
||
|
|
# Map each link to the requirement that owns it. This allows us to set
|
||
|
|
# `req.local_file_path` on the appropriate requirement after passing
|
||
|
|
# all the links at once into BatchDownloader.
|
||
|
|
links_to_fully_download: Dict[Link, InstallRequirement] = {}
|
||
|
|
for req in partially_downloaded_reqs:
|
||
|
|
assert req.link
|
||
|
|
links_to_fully_download[req.link] = req
|
||
|
|
|
||
|
|
batch_download = self._batch_download(
|
||
|
|
links_to_fully_download.keys(),
|
||
|
|
temp_dir,
|
||
|
|
)
|
||
|
|
for link, (filepath, _) in batch_download:
|
||
|
|
logger.debug("Downloading link %s to %s", link, filepath)
|
||
|
|
req = links_to_fully_download[link]
|
||
|
|
req.local_file_path = filepath
|
||
|
|
|
||
|
|
# This step is necessary to ensure all lazy wheels are processed
|
||
|
|
# successfully by the 'download', 'wheel', and 'install' commands.
|
||
|
|
for req in partially_downloaded_reqs:
|
||
|
|
self._prepare_linked_requirement(req, parallel_builds)
|
||
|
|
|
||
|
|
def prepare_linked_requirement(
|
||
|
|
self, req: InstallRequirement, parallel_builds: bool = False
|
||
|
|
) -> BaseDistribution:
|
||
|
|
"""Prepare a requirement to be obtained from req.link."""
|
||
|
|
assert req.link
|
||
|
|
self._log_preparing_link(req)
|
||
|
|
with indent_log():
|
||
|
|
# Check if the relevant file is already available
|
||
|
|
# in the download directory
|
||
|
|
file_path = None
|
||
|
|
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:
|
||
|
|
# 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
|
||
|
|
|
||
|
|
self._ensure_link_req_src_dir(req, parallel_builds)
|
||
|
|
hashes = self._get_linked_req_hashes(req)
|
||
|
|
|
||
|
|
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(
|
||
|
|
"Could not install requirement {} because of HTTP "
|
||
|
|
"error {} for URL {}".format(req, exc, 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.
|
||
|
|
if (
|
||
|
|
isinstance(req.download_info.info, ArchiveInfo)
|
||
|
|
and not req.download_info.info.hash
|
||
|
|
and local_file
|
||
|
|
):
|
||
|
|
hash = hash_file(local_file.path)[0].hexdigest()
|
||
|
|
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(
|
||
|
|
"The editable requirement {} cannot be installed when "
|
||
|
|
"requiring hashes, because there is no single file to "
|
||
|
|
"hash.".format(req)
|
||
|
|
)
|
||
|
|
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 "
|
||
|
|
"is set to {}".format(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()
|