mirror of https://github.com/pypa/pip
356 lines
14 KiB
Python
356 lines
14 KiB
Python
"""Prepares a distribution for installation
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"""
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import logging
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import os
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from pip._vendor import pkg_resources, requests
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from pip._internal.build_env import BuildEnvironment
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from pip._internal.compat import expanduser
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from pip._internal.download import (
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is_dir_url, is_file_url, is_vcs_url, unpack_url, url_to_path,
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)
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from pip._internal.exceptions import (
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DirectoryUrlHashUnsupported, HashUnpinned, InstallationError,
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PreviousBuildDirError, VcsHashUnsupported,
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)
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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.misc import display_path, normalize_path
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from pip._internal.vcs import vcs
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logger = logging.getLogger(__name__)
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def make_abstract_dist(req):
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"""Factory to make an abstract dist object.
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Preconditions: Either an editable req with a source_dir, or satisfied_by or
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a wheel link, or a non-editable req with a source_dir.
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:return: A concrete DistAbstraction.
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"""
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if req.editable:
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return IsSDist(req)
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elif req.link and req.link.is_wheel:
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return IsWheel(req)
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else:
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return IsSDist(req)
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class DistAbstraction(object):
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"""Abstracts out the wheel vs non-wheel Resolver.resolve() logic.
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The requirements for anything installable are as follows:
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- we must be able to determine the requirement name
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(or we can't correctly handle the non-upgrade case).
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- we must be able to generate a list of run-time dependencies
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without installing any additional packages (or we would
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have to either burn time by doing temporary isolated installs
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or alternatively violate pips 'don't start installing unless
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all requirements are available' rule - neither of which are
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desirable).
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- for packages with setup requirements, we must also be able
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to determine their requirements without installing additional
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packages (for the same reason as run-time dependencies)
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- we must be able to create a Distribution object exposing the
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above metadata.
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"""
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def __init__(self, req):
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self.req = req
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def dist(self, finder):
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"""Return a setuptools Dist object."""
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raise NotImplementedError(self.dist)
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def prep_for_dist(self, finder):
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"""Ensure that we can get a Dist for this requirement."""
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raise NotImplementedError(self.dist)
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class IsWheel(DistAbstraction):
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def dist(self, finder):
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return list(pkg_resources.find_distributions(
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self.req.source_dir))[0]
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def prep_for_dist(self, finder, build_isolation):
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# FIXME:https://github.com/pypa/pip/issues/1112
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pass
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class IsSDist(DistAbstraction):
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def dist(self, finder):
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dist = self.req.get_dist()
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# FIXME: shouldn't be globally added.
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if finder and dist.has_metadata('dependency_links.txt'):
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finder.add_dependency_links(
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dist.get_metadata_lines('dependency_links.txt')
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)
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return dist
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def prep_for_dist(self, finder, build_isolation):
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# Before calling "setup.py egg_info", we need to set-up the build
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# environment.
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build_requirements = self.req.get_pep_518_info()
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should_isolate = build_isolation and build_requirements is not None
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if should_isolate:
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# Haven't implemented PEP 517 yet, so spew a warning about it if
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# build-requirements don't include setuptools and wheel.
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missing_requirements = {'setuptools', 'wheel'} - {
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pkg_resources.Requirement(r).key for r in build_requirements
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}
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if missing_requirements:
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logger.warning(
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"Missing build requirements in pyproject.toml for %s.",
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self.req,
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)
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logger.warning(
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"This version of pip does not implement PEP 517 so it "
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"cannot build a wheel without %s.",
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" and ".join(map(repr, sorted(missing_requirements)))
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)
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# Isolate in a BuildEnvironment and install the build-time
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# requirements.
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self.req.build_env = BuildEnvironment()
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self.req.build_env.install_requirements(
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finder, build_requirements,
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"Installing build dependencies"
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)
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self.req.run_egg_info()
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self.req.assert_source_matches_version()
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class Installed(DistAbstraction):
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def dist(self, finder):
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return self.req.satisfied_by
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def prep_for_dist(self, finder):
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pass
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class RequirementPreparer(object):
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"""Prepares a Requirement
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"""
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def __init__(self, build_dir, download_dir, src_dir, wheel_download_dir,
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progress_bar, build_isolation, req_tracker):
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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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# 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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# Where still-packed .whl files should be written to. If None, they are
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# written to the download_dir parameter. Separate to download_dir to
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# permit only keeping wheel archives for pip wheel.
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if wheel_download_dir:
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wheel_download_dir = normalize_path(wheel_download_dir)
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self.wheel_download_dir = wheel_download_dir
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# NOTE
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# download_dir and wheel_download_dir overlap semantically and may
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# be combined if we're willing to have non-wheel archives present in
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# the wheelhouse output by 'pip wheel'.
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self.progress_bar = progress_bar
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# Is build isolation allowed?
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self.build_isolation = build_isolation
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@property
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def _download_should_save(self):
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# TODO: Modify to reduce indentation needed
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if self.download_dir:
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self.download_dir = expanduser(self.download_dir)
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if os.path.exists(self.download_dir):
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return True
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else:
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logger.critical('Could not find download directory')
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raise InstallationError(
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"Could not find or access download directory '%s'"
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% display_path(self.download_dir))
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return False
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def prepare_linked_requirement(self, req, session, finder,
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upgrade_allowed, require_hashes):
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"""Prepare a requirement that would be obtained from req.link
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"""
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# TODO: Breakup into smaller functions
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if req.link and req.link.scheme == 'file':
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path = url_to_path(req.link.url)
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logger.info('Processing %s', display_path(path))
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else:
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logger.info('Collecting %s', req)
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with indent_log():
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# @@ if filesystem packages are not marked
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# editable in a req, a non deterministic error
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# occurs when the script attempts to unpack the
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# build directory
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req.ensure_has_source_dir(self.build_dir)
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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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# package unpacked in `req.source_dir`
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if os.path.exists(os.path.join(req.source_dir, 'setup.py')):
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raise PreviousBuildDirError(
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"pip can't proceed with requirements '%s' due to a"
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" pre-existing build directory (%s). This is "
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"likely due to a previous installation that failed"
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". pip is being responsible and not assuming it "
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"can delete this. Please delete it and try again."
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% (req, req.source_dir)
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)
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req.populate_link(finder, upgrade_allowed, require_hashes)
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# We can't hit this spot and have populate_link return None.
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# req.satisfied_by is None here (because we're
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# guarded) and upgrade has no impact except when satisfied_by
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# is not None.
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# Then inside find_requirement existing_applicable -> False
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# If no new versions are found, DistributionNotFound is raised,
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# otherwise a result is guaranteed.
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assert req.link
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link = req.link
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# Now that we have the real link, we can tell what kind of
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# requirements we have and raise some more informative errors
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# than otherwise. (For example, we can raise VcsHashUnsupported
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# for a VCS URL rather than HashMissing.)
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if require_hashes:
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# We could check these first 2 conditions inside
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# unpack_url and save repetition of conditions, but then
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# we would report less-useful error messages for
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# unhashable requirements, complaining that there's no
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# hash provided.
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if is_vcs_url(link):
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raise VcsHashUnsupported()
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elif is_file_url(link) and is_dir_url(link):
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raise DirectoryUrlHashUnsupported()
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if not req.original_link and not req.is_pinned:
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# Unpinned packages are asking for trouble when a new
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# version is uploaded. This isn't a security check, but
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# it saves users a surprising hash mismatch in the
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# future.
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#
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# file:/// URLs aren't pinnable, so don't complain
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# about them not being pinned.
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raise HashUnpinned()
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hashes = req.hashes(trust_internet=not require_hashes)
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if require_hashes and not hashes:
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# Known-good hashes are missing for this requirement, so
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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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hashes = MissingHashes()
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try:
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download_dir = self.download_dir
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# We always delete unpacked sdists after pip ran.
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autodelete_unpacked = True
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if req.link.is_wheel and self.wheel_download_dir:
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# when doing 'pip wheel` we download wheels to a
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# dedicated dir.
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download_dir = self.wheel_download_dir
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if req.link.is_wheel:
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if download_dir:
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# When downloading, we only unpack wheels to get
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# metadata.
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autodelete_unpacked = True
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else:
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# When installing a wheel, we use the unpacked
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# wheel.
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autodelete_unpacked = False
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unpack_url(
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req.link, req.source_dir,
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download_dir, autodelete_unpacked,
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session=session, hashes=hashes,
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progress_bar=self.progress_bar
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)
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except requests.HTTPError as exc:
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logger.critical(
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'Could not install requirement %s because of error %s',
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req,
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exc,
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)
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raise InstallationError(
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'Could not install requirement %s because of HTTP '
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'error %s for URL %s' %
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(req, exc, req.link)
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)
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abstract_dist = make_abstract_dist(req)
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with self.req_tracker.track(req):
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abstract_dist.prep_for_dist(finder, self.build_isolation)
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if self._download_should_save:
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# Make a .zip of the source_dir we already created.
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if req.link.scheme in vcs.all_schemes:
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req.archive(self.download_dir)
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return abstract_dist
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def prepare_editable_requirement(self, req, require_hashes, use_user_site,
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finder):
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"""Prepare an editable requirement
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"""
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assert req.editable, "cannot prepare a non-editable req as editable"
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logger.info('Obtaining %s', req)
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with indent_log():
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if require_hashes:
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raise InstallationError(
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'The editable requirement %s cannot be installed when '
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'requiring hashes, because there is no single file to '
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'hash.' % req
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)
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req.ensure_has_source_dir(self.src_dir)
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req.update_editable(not self._download_should_save)
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abstract_dist = make_abstract_dist(req)
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with self.req_tracker.track(req):
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abstract_dist.prep_for_dist(finder, self.build_isolation)
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if self._download_should_save:
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req.archive(self.download_dir)
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req.check_if_exists(use_user_site)
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return abstract_dist
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def prepare_installed_requirement(self, req, require_hashes, skip_reason):
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"""Prepare an already-installed requirement
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"""
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assert req.satisfied_by, "req should have been satisfied but isn't"
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assert skip_reason is not None, (
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"did not get skip reason skipped but req.satisfied_by "
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"is set to %r" % (req.satisfied_by,)
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)
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logger.info(
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'Requirement %s: %s (%s)',
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skip_reason, req, req.satisfied_by.version
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)
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with indent_log():
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if require_hashes:
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logger.debug(
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'Since it is already installed, we are trusting this '
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'package without checking its hash. To ensure a '
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'completely repeatable environment, install into an '
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'empty virtualenv.'
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)
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abstract_dist = Installed(req)
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return abstract_dist
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