You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

592 lines
20 KiB
Python

"""Prepares a distribution for installation
"""
# The following comment should be removed at some point in the future.
# mypy: strict-optional=False
import logging
import mimetypes
import os
import shutil
import sys
from pip._vendor import requests
from pip._vendor.six import PY2
from pip._internal.distributions import (
make_distribution_for_install_requirement,
)
from pip._internal.distributions.installed import InstalledDistribution
from pip._internal.exceptions import (
DirectoryUrlHashUnsupported,
HashMismatch,
HashUnpinned,
InstallationError,
PreviousBuildDirError,
VcsHashUnsupported,
)
from pip._internal.utils.filesystem import copy2_fixed
from pip._internal.utils.hashes import MissingHashes
from pip._internal.utils.logging import indent_log
from pip._internal.utils.marker_files import write_delete_marker_file
from pip._internal.utils.misc import (
ask_path_exists,
backup_dir,
display_path,
hide_url,
path_to_display,
rmtree,
)
from pip._internal.utils.temp_dir import TempDirectory
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
from pip._internal.utils.unpacking import unpack_file
from pip._internal.vcs import vcs
if MYPY_CHECK_RUNNING:
from typing import (
Callable, List, Optional, Tuple,
)
from mypy_extensions import TypedDict
from pip._internal.distributions import AbstractDistribution
from pip._internal.index.package_finder import PackageFinder
from pip._internal.models.link import Link
from pip._internal.network.download import Downloader
from pip._internal.req.req_install import InstallRequirement
from pip._internal.req.req_tracker import RequirementTracker
from pip._internal.utils.hashes import Hashes
if PY2:
CopytreeKwargs = TypedDict(
'CopytreeKwargs',
{
'ignore': Callable[[str, List[str]], List[str]],
'symlinks': bool,
},
total=False,
)
else:
CopytreeKwargs = TypedDict(
'CopytreeKwargs',
{
'copy_function': Callable[[str, str], None],
'ignore': Callable[[str, List[str]], List[str]],
'ignore_dangling_symlinks': bool,
'symlinks': bool,
},
total=False,
)
logger = logging.getLogger(__name__)
def _get_prepared_distribution(
req, # type: InstallRequirement
req_tracker, # type: RequirementTracker
finder, # type: PackageFinder
build_isolation # type: bool
):
# type: (...) -> AbstractDistribution
"""Prepare a distribution for installation.
"""
abstract_dist = make_distribution_for_install_requirement(req)
with req_tracker.track(req):
abstract_dist.prepare_distribution_metadata(finder, build_isolation)
return abstract_dist
def unpack_vcs_link(link, location):
# type: (Link, str) -> None
vcs_backend = vcs.get_backend_for_scheme(link.scheme)
assert vcs_backend is not None
vcs_backend.unpack(location, url=hide_url(link.url))
def _copy_file(filename, location, link):
# type: (str, str, Link) -> None
copy = True
download_location = os.path.join(location, link.filename)
if os.path.exists(download_location):
response = ask_path_exists(
'The file {} exists. (i)gnore, (w)ipe, (b)ackup, (a)abort'.format(
display_path(download_location)
),
('i', 'w', 'b', 'a'),
)
if response == 'i':
copy = False
elif response == 'w':
logger.warning('Deleting %s', display_path(download_location))
os.remove(download_location)
elif response == 'b':
dest_file = backup_dir(download_location)
logger.warning(
'Backing up %s to %s',
display_path(download_location),
display_path(dest_file),
)
shutil.move(download_location, dest_file)
elif response == 'a':
sys.exit(-1)
if copy:
shutil.copy(filename, download_location)
logger.info('Saved %s', display_path(download_location))
def unpack_http_url(
link, # type: Link
location, # type: str
downloader, # type: Downloader
download_dir=None, # type: Optional[str]
hashes=None, # type: Optional[Hashes]
):
# type: (...) -> str
temp_dir = TempDirectory(kind="unpack", globally_managed=True)
# If a download dir is specified, is the file already downloaded there?
already_downloaded_path = None
if download_dir:
already_downloaded_path = _check_download_dir(
link, download_dir, hashes
)
if already_downloaded_path:
from_path = already_downloaded_path
content_type = mimetypes.guess_type(from_path)[0]
else:
# let's download to a tmp dir
from_path, content_type = _download_http_url(
link, downloader, temp_dir.path, hashes
)
# unpack the archive to the build dir location. even when only
# downloading archives, they have to be unpacked to parse dependencies
unpack_file(from_path, location, content_type)
return from_path
def _copy2_ignoring_special_files(src, dest):
# type: (str, str) -> None
"""Copying special files is not supported, but as a convenience to users
we skip errors copying them. This supports tools that may create e.g.
socket files in the project source directory.
"""
try:
copy2_fixed(src, dest)
except shutil.SpecialFileError as e:
# SpecialFileError may be raised due to either the source or
# destination. If the destination was the cause then we would actually
# care, but since the destination directory is deleted prior to
# copy we ignore all of them assuming it is caused by the source.
logger.warning(
"Ignoring special file error '%s' encountered copying %s to %s.",
str(e),
path_to_display(src),
path_to_display(dest),
)
def _copy_source_tree(source, target):
# type: (str, str) -> None
def ignore(d, names):
# type: (str, List[str]) -> List[str]
# Pulling in those directories can potentially be very slow,
# exclude the following directories if they appear in the top
# level dir (and only it).
# See discussion at https://github.com/pypa/pip/pull/6770
return ['.tox', '.nox'] if d == source else []
kwargs = dict(ignore=ignore, symlinks=True) # type: CopytreeKwargs
if not PY2:
# Python 2 does not support copy_function, so we only ignore
# errors on special file copy in Python 3.
kwargs['copy_function'] = _copy2_ignoring_special_files
shutil.copytree(source, target, **kwargs)
def unpack_file_url(
link, # type: Link
location, # type: str
download_dir=None, # type: Optional[str]
hashes=None # type: Optional[Hashes]
):
# type: (...) -> Optional[str]
"""Unpack link into location.
"""
link_path = link.file_path
# If it's a url to a local directory
if link.is_existing_dir():
if os.path.isdir(location):
rmtree(location)
_copy_source_tree(link_path, location)
return None
# If a download dir is specified, is the file already there and valid?
already_downloaded_path = None
if download_dir:
already_downloaded_path = _check_download_dir(
link, download_dir, hashes
)
if already_downloaded_path:
from_path = already_downloaded_path
else:
from_path = link_path
# If --require-hashes is off, `hashes` is either empty, the
# link's embedded hash, or MissingHashes; it is required to
# match. If --require-hashes is on, we are satisfied by any
# hash in `hashes` matching: a URL-based or an option-based
# one; no internet-sourced hash will be in `hashes`.
if hashes:
hashes.check_against_path(from_path)
content_type = mimetypes.guess_type(from_path)[0]
# unpack the archive to the build dir location. even when only downloading
# archives, they have to be unpacked to parse dependencies
unpack_file(from_path, location, content_type)
return from_path
def unpack_url(
link, # type: Link
location, # type: str
downloader, # type: Downloader
download_dir=None, # type: Optional[str]
hashes=None, # type: Optional[Hashes]
):
# type: (...) -> Optional[str]
"""Unpack link into location, downloading if required.
:param hashes: A Hashes object, one of whose embedded hashes must match,
or HashMismatch will be raised. If the Hashes is empty, no matches are
required, and unhashable types of requirements (like VCS ones, which
would ordinarily raise HashUnsupported) are allowed.
"""
# non-editable vcs urls
if link.is_vcs:
unpack_vcs_link(link, location)
return None
# file urls
elif link.is_file:
return unpack_file_url(link, location, download_dir, hashes=hashes)
# http urls
else:
return unpack_http_url(
link,
location,
downloader,
download_dir,
hashes=hashes,
)
def _download_http_url(
link, # type: Link
downloader, # type: Downloader
temp_dir, # type: str
hashes, # type: Optional[Hashes]
):
# type: (...) -> Tuple[str, str]
"""Download link url into temp_dir using provided session"""
download = downloader(link)
file_path = os.path.join(temp_dir, download.filename)
with open(file_path, 'wb') as content_file:
for chunk in download.chunks:
content_file.write(chunk)
if hashes:
hashes.check_against_path(file_path)
return file_path, download.response.headers.get('content-type', '')
def _check_download_dir(link, download_dir, hashes):
# type: (Link, str, Optional[Hashes]) -> Optional[str]
""" Check download_dir for previously downloaded file with correct hash
If a correct file is found return its path else None
"""
download_path = os.path.join(download_dir, link.filename)
if not os.path.exists(download_path):
return None
# If already downloaded, does its hash match?
logger.info('File was already downloaded %s', download_path)
if hashes:
try:
hashes.check_against_path(download_path)
except HashMismatch:
logger.warning(
'Previously-downloaded file %s has bad hash. '
'Re-downloading.',
download_path
)
os.unlink(download_path)
return None
return download_path
class RequirementPreparer(object):
"""Prepares a Requirement
"""
def __init__(
self,
build_dir, # type: str
download_dir, # type: Optional[str]
src_dir, # type: str
wheel_download_dir, # type: Optional[str]
build_isolation, # type: bool
req_tracker, # type: RequirementTracker
downloader, # type: Downloader
finder, # type: PackageFinder
require_hashes, # type: bool
use_user_site, # type: bool
):
# type: (...) -> None
super(RequirementPreparer, self).__init__()
self.src_dir = src_dir
self.build_dir = build_dir
self.req_tracker = req_tracker
self.downloader = downloader
self.finder = finder
# Where still-packed archives should be written to. If None, they are
# not saved, and are deleted immediately after unpacking.
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.
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'.
# 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
# Since source_dir is only set for editable requirements.
assert req.source_dir is None
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:
local_path = unpack_url(
link, req.source_dir, self.downloader, download_dir,
hashes=hashes,
)
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)
)
# For use in later processing, preserve the file path on the
# requirement.
if local_path:
req.local_file_path = local_path
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 download_dir:
if link.is_existing_dir():
logger.info('Link is a directory, ignoring download_dir')
elif local_path and not os.path.exists(
os.path.join(download_dir, link.filename)
):
_copy_file(local_path, download_dir, link)
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