mirror of https://github.com/pypa/pip
745 lines
26 KiB
Python
745 lines
26 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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# mypy: disallow-untyped-defs=False
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import cgi
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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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import sys
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from pip._vendor import requests
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from pip._vendor.requests.models import CONTENT_CHUNK_SIZE, Response
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from pip._vendor.six import PY2
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from pip._internal.distributions import (
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make_distribution_for_install_requirement,
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)
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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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PreviousBuildDirError,
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VcsHashUnsupported,
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)
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from pip._internal.models.index import PyPI
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from pip._internal.network.cache import is_from_cache
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from pip._internal.network.session import PipSession
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from pip._internal.network.utils import response_chunks
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from pip._internal.utils.compat import expanduser
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from pip._internal.utils.filesystem import copy2_fixed
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from pip._internal.utils.hashes import MissingHashes
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from pip._internal.utils.logging import indent_log
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from pip._internal.utils.marker_files import write_delete_marker_file
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from pip._internal.utils.misc import (
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ask_path_exists,
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backup_dir,
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consume,
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display_path,
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format_size,
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hide_url,
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normalize_path,
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path_to_display,
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rmtree,
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splitext,
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)
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from pip._internal.utils.temp_dir import TempDirectory
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from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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from pip._internal.utils.ui import DownloadProgressProvider
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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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if MYPY_CHECK_RUNNING:
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from typing import (
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Any, Callable, IO, List, Optional, Tuple,
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)
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from mypy_extensions import TypedDict
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from pip._internal.distributions import AbstractDistribution
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from pip._internal.index.package_finder import PackageFinder
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from pip._internal.models.link import Link
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from pip._internal.req.req_install import InstallRequirement
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from pip._internal.req.req_tracker import RequirementTracker
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from pip._internal.utils.hashes import Hashes
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if PY2:
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CopytreeKwargs = TypedDict(
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'CopytreeKwargs',
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{
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'ignore': Callable[[str, List[str]], List[str]],
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'symlinks': bool,
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},
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total=False,
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)
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else:
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CopytreeKwargs = TypedDict(
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'CopytreeKwargs',
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{
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'copy_function': Callable[[str, str], None],
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'ignore': Callable[[str, List[str]], List[str]],
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'ignore_dangling_symlinks': bool,
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'symlinks': bool,
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},
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total=False,
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)
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logger = logging.getLogger(__name__)
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def _get_prepared_distribution(req, req_tracker, finder, build_isolation):
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"""Prepare a distribution for installation.
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"""
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abstract_dist = make_distribution_for_install_requirement(req)
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with req_tracker.track(req):
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abstract_dist.prepare_distribution_metadata(finder, build_isolation)
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return abstract_dist
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def unpack_vcs_link(link, location):
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# type: (Link, str) -> 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))
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def _progress_indicator(iterable, *args, **kwargs):
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return iterable
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def _download_url(
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resp, # type: Response
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link, # type: Link
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content_file, # type: IO[Any]
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hashes, # type: Optional[Hashes]
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progress_bar # type: str
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):
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# type: (...) -> None
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try:
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total_length = int(resp.headers['content-length'])
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except (ValueError, KeyError, TypeError):
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total_length = 0
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if link.netloc == PyPI.file_storage_domain:
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url = link.show_url
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else:
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url = link.url_without_fragment
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if total_length:
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logger.info("Downloading %s (%s)", url, format_size(total_length))
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elif is_from_cache(resp):
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logger.info("Using cached %s", url)
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else:
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logger.info("Downloading %s", url)
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if logger.getEffectiveLevel() > logging.INFO:
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show_progress = False
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elif is_from_cache(resp):
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show_progress = False
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elif total_length > (40 * 1000):
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show_progress = True
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elif not total_length:
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show_progress = True
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else:
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show_progress = False
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def written_chunks(chunks):
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for chunk in chunks:
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content_file.write(chunk)
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yield chunk
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progress_indicator = _progress_indicator
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if show_progress: # We don't show progress on cached responses
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progress_indicator = DownloadProgressProvider(progress_bar,
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max=total_length)
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downloaded_chunks = written_chunks(
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progress_indicator(
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response_chunks(resp, CONTENT_CHUNK_SIZE),
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CONTENT_CHUNK_SIZE
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)
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)
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if hashes:
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hashes.check_against_chunks(downloaded_chunks)
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else:
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consume(downloaded_chunks)
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def _copy_file(filename, location, link):
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copy = True
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download_location = os.path.join(location, link.filename)
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if os.path.exists(download_location):
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response = ask_path_exists(
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'The file %s exists. (i)gnore, (w)ipe, (b)ackup, (a)abort' %
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display_path(download_location), ('i', 'w', 'b', 'a'))
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if response == 'i':
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copy = False
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elif response == 'w':
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logger.warning('Deleting %s', display_path(download_location))
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os.remove(download_location)
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elif response == 'b':
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dest_file = backup_dir(download_location)
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logger.warning(
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'Backing up %s to %s',
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display_path(download_location),
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display_path(dest_file),
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)
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shutil.move(download_location, dest_file)
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elif response == 'a':
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sys.exit(-1)
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if copy:
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shutil.copy(filename, download_location)
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logger.info('Saved %s', display_path(download_location))
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def unpack_http_url(
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link, # type: Link
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location, # type: str
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download_dir=None, # type: Optional[str]
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session=None, # type: Optional[PipSession]
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hashes=None, # type: Optional[Hashes]
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progress_bar="on" # type: str
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):
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# type: (...) -> None
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if session is None:
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raise TypeError(
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"unpack_http_url() missing 1 required keyword argument: 'session'"
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)
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with TempDirectory(kind="unpack") as temp_dir:
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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,
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download_dir,
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hashes)
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if already_downloaded_path:
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from_path = already_downloaded_path
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content_type = mimetypes.guess_type(from_path)[0]
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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_http_url(link,
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session,
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temp_dir.path,
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hashes,
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progress_bar)
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# unpack the archive to the build dir location. even when only
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# downloading archives, they have to be unpacked to parse dependencies
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unpack_file(from_path, location, content_type)
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# a download dir is specified; let's copy the archive there
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if download_dir and not already_downloaded_path:
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_copy_file(from_path, download_dir, link)
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if not already_downloaded_path:
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os.unlink(from_path)
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def _copy2_ignoring_special_files(src, dest):
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# type: (str, str) -> None
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"""Copying special files is not supported, but as a convenience to users
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we skip errors copying them. This supports tools that may create e.g.
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socket files in the project source directory.
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"""
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try:
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copy2_fixed(src, dest)
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except shutil.SpecialFileError as e:
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# SpecialFileError may be raised due to either the source or
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# destination. If the destination was the cause then we would actually
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# care, but since the destination directory is deleted prior to
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# copy we ignore all of them assuming it is caused by the source.
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logger.warning(
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"Ignoring special file error '%s' encountered copying %s to %s.",
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str(e),
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path_to_display(src),
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path_to_display(dest),
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)
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def _copy_source_tree(source, target):
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# type: (str, str) -> None
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def ignore(d, names):
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# Pulling in those directories can potentially be very slow,
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# exclude the following directories if they appear in the top
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# level dir (and only it).
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# See discussion at https://github.com/pypa/pip/pull/6770
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return ['.tox', '.nox'] if d == source else []
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kwargs = dict(ignore=ignore, symlinks=True) # type: CopytreeKwargs
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if not PY2:
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# Python 2 does not support copy_function, so we only ignore
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# errors on special file copy in Python 3.
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kwargs['copy_function'] = _copy2_ignoring_special_files
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shutil.copytree(source, target, **kwargs)
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def unpack_file_url(
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link, # type: Link
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location, # type: str
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download_dir=None, # type: Optional[str]
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hashes=None # type: Optional[Hashes]
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):
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# type: (...) -> None
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"""Unpack link into location.
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If download_dir is provided and link points to a file, make a copy
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of the link file inside download_dir.
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"""
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link_path = link.file_path
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# If it's a url to a local directory
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if link.is_existing_dir():
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if os.path.isdir(location):
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rmtree(location)
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_copy_source_tree(link_path, location)
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if download_dir:
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logger.info('Link is a directory, ignoring download_dir')
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return
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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(link_path)
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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,
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download_dir,
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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_path
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content_type = mimetypes.guess_type(from_path)[0]
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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
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unpack_file(from_path, location, content_type)
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# a download dir is specified and not already downloaded
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if download_dir and not already_downloaded_path:
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_copy_file(from_path, download_dir, link)
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def unpack_url(
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link, # type: Link
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location, # type: str
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download_dir=None, # type: Optional[str]
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session=None, # type: Optional[PipSession]
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hashes=None, # type: Optional[Hashes]
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progress_bar="on" # type: str
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):
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# type: (...) -> None
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"""Unpack link.
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If link is a VCS link:
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if only_download, export into download_dir and ignore location
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else unpack into location
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for other types of link:
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- unpack into location
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- if download_dir, copy the file into download_dir
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- if only_download, mark location for deletion
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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)
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# file urls
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elif link.is_file:
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unpack_file_url(link, location, download_dir, hashes=hashes)
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# http urls
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else:
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if session is None:
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session = PipSession()
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unpack_http_url(
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link,
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location,
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download_dir,
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session,
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hashes=hashes,
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progress_bar=progress_bar
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)
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def sanitize_content_filename(filename):
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# type: (str) -> str
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"""
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Sanitize the "filename" value from a Content-Disposition header.
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"""
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return os.path.basename(filename)
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def parse_content_disposition(content_disposition, default_filename):
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# type: (str, str) -> str
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"""
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Parse the "filename" value from a Content-Disposition header, and
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return the default filename if the result is empty.
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"""
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_type, params = cgi.parse_header(content_disposition)
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filename = params.get('filename')
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if filename:
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# We need to sanitize the filename to prevent directory traversal
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# in case the filename contains ".." path parts.
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filename = sanitize_content_filename(filename)
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return filename or default_filename
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def _download_http_url(
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link, # type: Link
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session, # type: PipSession
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temp_dir, # type: str
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hashes, # type: Optional[Hashes]
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progress_bar # type: str
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):
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# type: (...) -> Tuple[str, str]
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"""Download link url into temp_dir using provided session"""
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target_url = link.url.split('#', 1)[0]
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try:
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resp = session.get(
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target_url,
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# We use Accept-Encoding: identity here because requests
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# defaults to accepting compressed responses. This breaks in
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# a variety of ways depending on how the server is configured.
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# - Some servers will notice that the file isn't a compressible
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# file and will leave the file alone and with an empty
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# Content-Encoding
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# - Some servers will notice that the file is already
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# compressed and will leave the file alone and will add a
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# Content-Encoding: gzip header
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# - Some servers won't notice anything at all and will take
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# a file that's already been compressed and compress it again
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# and set the Content-Encoding: gzip header
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# By setting this to request only the identity encoding We're
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# hoping to eliminate the third case. Hopefully there does not
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# exist a server which when given a file will notice it is
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# already compressed and that you're not asking for a
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# compressed file and will then decompress it before sending
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# because if that's the case I don't think it'll ever be
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# possible to make this work.
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headers={"Accept-Encoding": "identity"},
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stream=True,
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)
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resp.raise_for_status()
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except requests.HTTPError as exc:
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logger.critical(
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"HTTP error %s while getting %s", exc.response.status_code, link,
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)
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raise
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content_type = resp.headers.get('content-type', '')
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filename = link.filename # fallback
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# Have a look at the Content-Disposition header for a better guess
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content_disposition = resp.headers.get('content-disposition')
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if content_disposition:
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filename = parse_content_disposition(content_disposition, filename)
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ext = splitext(filename)[1] # type: Optional[str]
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if not ext:
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ext = mimetypes.guess_extension(content_type)
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if ext:
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filename += ext
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if not ext and link.url != resp.url:
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ext = os.path.splitext(resp.url)[1]
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if ext:
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filename += ext
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file_path = os.path.join(temp_dir, filename)
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with open(file_path, 'wb') as content_file:
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_download_url(resp, link, content_file, hashes, progress_bar)
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return file_path, content_type
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def _check_download_dir(link, download_dir, hashes):
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# type: (Link, str, Optional[Hashes]) -> 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. '
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'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(object):
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"""Prepares a Requirement
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"""
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def __init__(
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self,
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build_dir, # type: str
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download_dir, # type: Optional[str]
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src_dir, # type: str
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wheel_download_dir, # type: Optional[str]
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progress_bar, # type: str
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build_isolation, # type: bool
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req_tracker, # type: RequirementTracker
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session, # type: PipSession
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finder, # type: PackageFinder
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require_hashes, # type: bool
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use_user_site, # type: bool
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):
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# type: (...) -> None
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super(RequirementPreparer, self).__init__()
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self.src_dir = src_dir
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self.build_dir = build_dir
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self.req_tracker = req_tracker
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self.session = session
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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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if download_dir:
|
|
download_dir = expanduser(download_dir)
|
|
self.download_dir = download_dir
|
|
|
|
# Where still-packed .whl files should be written to. If None, they are
|
|
# written to the download_dir parameter. Separate to download_dir to
|
|
# permit only keeping wheel archives for pip wheel.
|
|
if wheel_download_dir:
|
|
wheel_download_dir = normalize_path(wheel_download_dir)
|
|
self.wheel_download_dir = wheel_download_dir
|
|
|
|
# NOTE
|
|
# download_dir and wheel_download_dir overlap semantically and may
|
|
# be combined if we're willing to have non-wheel archives present in
|
|
# the wheelhouse output by 'pip wheel'.
|
|
|
|
self.progress_bar = progress_bar
|
|
|
|
# Is build isolation allowed?
|
|
self.build_isolation = build_isolation
|
|
|
|
# Should hash-checking be required?
|
|
self.require_hashes = require_hashes
|
|
|
|
# Should install in user site-packages?
|
|
self.use_user_site = use_user_site
|
|
|
|
@property
|
|
def _download_should_save(self):
|
|
# type: () -> bool
|
|
if not self.download_dir:
|
|
return False
|
|
|
|
if os.path.exists(self.download_dir):
|
|
return True
|
|
|
|
logger.critical('Could not find download directory')
|
|
raise InstallationError(
|
|
"Could not find or access download directory '{}'"
|
|
.format(self.download_dir))
|
|
|
|
def prepare_linked_requirement(
|
|
self,
|
|
req, # type: InstallRequirement
|
|
):
|
|
# type: (...) -> AbstractDistribution
|
|
"""Prepare a requirement that would be obtained from req.link
|
|
"""
|
|
assert req.link
|
|
link = req.link
|
|
|
|
# TODO: Breakup into smaller functions
|
|
if link.scheme == 'file':
|
|
path = link.file_path
|
|
logger.info('Processing %s', display_path(path))
|
|
else:
|
|
logger.info('Collecting %s', req.req or req)
|
|
|
|
with indent_log():
|
|
# @@ if filesystem packages are not marked
|
|
# editable in a req, a non deterministic error
|
|
# occurs when the script attempts to unpack the
|
|
# build directory
|
|
req.ensure_has_source_dir(self.build_dir)
|
|
# If a checkout exists, it's unwise to keep going. version
|
|
# inconsistencies are logged later, but do not fail the
|
|
# installation.
|
|
# FIXME: this won't upgrade when there's an existing
|
|
# package unpacked in `req.source_dir`
|
|
if os.path.exists(os.path.join(req.source_dir, 'setup.py')):
|
|
raise PreviousBuildDirError(
|
|
"pip can't proceed with requirements '{}' due to a"
|
|
" pre-existing build directory ({}). This is "
|
|
"likely due to a previous installation that failed"
|
|
". pip is being responsible and not assuming it "
|
|
"can delete this. Please delete it and try again."
|
|
.format(req, req.source_dir)
|
|
)
|
|
|
|
# Now that we have the real link, we can tell what kind of
|
|
# requirements we have and raise some more informative errors
|
|
# than otherwise. (For example, we can raise VcsHashUnsupported
|
|
# for a VCS URL rather than HashMissing.)
|
|
if self.require_hashes:
|
|
# We could check these first 2 conditions inside
|
|
# unpack_url and save repetition of conditions, but then
|
|
# we would report less-useful error messages for
|
|
# unhashable requirements, complaining that there's no
|
|
# hash provided.
|
|
if link.is_vcs:
|
|
raise VcsHashUnsupported()
|
|
elif link.is_existing_dir():
|
|
raise DirectoryUrlHashUnsupported()
|
|
if not req.original_link and not req.is_pinned:
|
|
# Unpinned packages are asking for trouble when a new
|
|
# version is uploaded. This isn't a security check, but
|
|
# it saves users a surprising hash mismatch in the
|
|
# future.
|
|
#
|
|
# file:/// URLs aren't pinnable, so don't complain
|
|
# about them not being pinned.
|
|
raise HashUnpinned()
|
|
|
|
hashes = req.hashes(trust_internet=not self.require_hashes)
|
|
if self.require_hashes and not hashes:
|
|
# Known-good hashes are missing for this requirement, so
|
|
# shim it with a facade object that will provoke hash
|
|
# computation and then raise a HashMissing exception
|
|
# showing the user what the hash should be.
|
|
hashes = MissingHashes()
|
|
|
|
download_dir = self.download_dir
|
|
if link.is_wheel and self.wheel_download_dir:
|
|
# when doing 'pip wheel` we download wheels to a
|
|
# dedicated dir.
|
|
download_dir = self.wheel_download_dir
|
|
|
|
try:
|
|
unpack_url(
|
|
link, req.source_dir, download_dir,
|
|
session=self.session, hashes=hashes,
|
|
progress_bar=self.progress_bar
|
|
)
|
|
except requests.HTTPError as exc:
|
|
logger.critical(
|
|
'Could not install requirement %s because of error %s',
|
|
req,
|
|
exc,
|
|
)
|
|
raise InstallationError(
|
|
'Could not install requirement {} because of HTTP '
|
|
'error {} for URL {}'.format(req, exc, link)
|
|
)
|
|
|
|
if link.is_wheel:
|
|
if download_dir:
|
|
# When downloading, we only unpack wheels to get
|
|
# metadata.
|
|
autodelete_unpacked = True
|
|
else:
|
|
# When installing a wheel, we use the unpacked
|
|
# wheel.
|
|
autodelete_unpacked = False
|
|
else:
|
|
# We always delete unpacked sdists after pip runs.
|
|
autodelete_unpacked = True
|
|
if autodelete_unpacked:
|
|
write_delete_marker_file(req.source_dir)
|
|
|
|
abstract_dist = _get_prepared_distribution(
|
|
req, self.req_tracker, self.finder, self.build_isolation,
|
|
)
|
|
|
|
if self._download_should_save:
|
|
# Make a .zip of the source_dir we already created.
|
|
if link.is_vcs:
|
|
req.archive(self.download_dir)
|
|
return abstract_dist
|
|
|
|
def prepare_editable_requirement(
|
|
self,
|
|
req, # type: InstallRequirement
|
|
):
|
|
# type: (...) -> AbstractDistribution
|
|
"""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(not self._download_should_save)
|
|
|
|
abstract_dist = _get_prepared_distribution(
|
|
req, self.req_tracker, self.finder, self.build_isolation,
|
|
)
|
|
|
|
if self._download_should_save:
|
|
req.archive(self.download_dir)
|
|
req.check_if_exists(self.use_user_site)
|
|
|
|
return abstract_dist
|
|
|
|
def prepare_installed_requirement(
|
|
self,
|
|
req, # type: InstallRequirement
|
|
skip_reason # type: str
|
|
):
|
|
# type: (...) -> AbstractDistribution
|
|
"""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.'
|
|
)
|
|
abstract_dist = InstalledDistribution(req)
|
|
|
|
return abstract_dist
|