"""Contains the Command base classes that depend on PipSession.
The classes in this module are in a separate module so the commands not
needing download / PackageFinder capability don't unnecessarily import the
PackageFinder machinery and all its vendored dependencies, etc.
"""
import logging
import os
import sys
from functools import partial
from optparse import Values
from typing import Any, List, Optional, Tuple
from pip._internal.cache import WheelCache
from pip._internal.cli import cmdoptions
from pip._internal.cli.base_command import Command
from pip._internal.cli.command_context import CommandContextMixIn
from pip._internal.exceptions import CommandError, PreviousBuildDirError
from pip._internal.index.collector import LinkCollector
from pip._internal.index.package_finder import PackageFinder
from pip._internal.models.selection_prefs import SelectionPreferences
from pip._internal.models.target_python import TargetPython
from pip._internal.network.session import PipSession
from pip._internal.operations.build.build_tracker import BuildTracker
from pip._internal.operations.prepare import RequirementPreparer
from pip._internal.req.constructors import (
install_req_from_editable,
install_req_from_line,
install_req_from_parsed_requirement,
install_req_from_req_string,
)
from pip._internal.req.req_file import parse_requirements
from pip._internal.req.req_install import InstallRequirement
from pip._internal.resolution.base import BaseResolver
from pip._internal.self_outdated_check import pip_self_version_check
from pip._internal.utils.deprecation import deprecated
from pip._internal.utils.temp_dir import (
TempDirectory,
TempDirectoryTypeRegistry,
tempdir_kinds,
)
from pip._internal.utils.virtualenv import running_under_virtualenv
logger = logging.getLogger(__name__)
[docs]class SessionCommandMixin(CommandContextMixIn):
"""
A class mixin for command classes needing _build_session().
"""
def __init__(self) -> None:
super().__init__()
self._session: Optional[PipSession] = None
[docs] @classmethod
def _get_index_urls(cls, options: Values) -> Optional[List[str]]:
"""Return a list of index urls from user-provided options."""
index_urls = []
if not getattr(options, "no_index", False):
url = getattr(options, "index_url", None)
if url:
index_urls.append(url)
urls = getattr(options, "extra_index_urls", None)
if urls:
index_urls.extend(urls)
# Return None rather than an empty list
return index_urls or None
[docs] def get_default_session(self, options: Values) -> PipSession:
"""Get a default-managed session."""
if self._session is None:
self._session = self.enter_context(self._build_session(options))
# there's no type annotation on requests.Session, so it's
# automatically ContextManager[Any] and self._session becomes Any,
# then https://github.com/python/mypy/issues/7696 kicks in
assert self._session is not None
return self._session
[docs] def _build_session(
self,
options: Values,
retries: Optional[int] = None,
timeout: Optional[int] = None,
) -> PipSession:
assert not options.cache_dir or os.path.isabs(options.cache_dir)
session = PipSession(
cache=(
os.path.join(options.cache_dir, "http") if options.cache_dir else None
),
retries=retries if retries is not None else options.retries,
trusted_hosts=options.trusted_hosts,
index_urls=self._get_index_urls(options),
)
# Handle custom ca-bundles from the user
if options.cert:
session.verify = options.cert
# Handle SSL client certificate
if options.client_cert:
session.cert = options.client_cert
# Handle timeouts
if options.timeout or timeout:
session.timeout = timeout if timeout is not None else options.timeout
# Handle configured proxies
if options.proxy:
session.proxies = {
"http": options.proxy,
"https": options.proxy,
}
# Determine if we can prompt the user for authentication or not
session.auth.prompting = not options.no_input
return session
class IndexGroupCommand(Command, SessionCommandMixin):
"""
Abstract base class for commands with the index_group options.
This also corresponds to the commands that permit the pip version check.
"""
def handle_pip_version_check(self, options: Values) -> None:
"""
Do the pip version check if not disabled.
This overrides the default behavior of not doing the check.
"""
# Make sure the index_group options are present.
assert hasattr(options, "no_index")
if options.disable_pip_version_check or options.no_index:
return
# Otherwise, check if we're using the latest version of pip available.
session = self._build_session(
options, retries=0, timeout=min(5, options.timeout)
)
with session:
pip_self_version_check(session, options)
KEEPABLE_TEMPDIR_TYPES = [
tempdir_kinds.BUILD_ENV,
tempdir_kinds.EPHEM_WHEEL_CACHE,
tempdir_kinds.REQ_BUILD,
]
def warn_if_run_as_root() -> None:
"""Output a warning for sudo users on Unix.
In a virtual environment, sudo pip still writes to virtualenv.
On Windows, users may run pip as Administrator without issues.
This warning only applies to Unix root users outside of virtualenv.
"""
if running_under_virtualenv():
return
if not hasattr(os, "getuid"):
return
# On Windows, there are no "system managed" Python packages. Installing as
# Administrator via pip is the correct way of updating system environments.
#
# We choose sys.platform over utils.compat.WINDOWS here to enable Mypy platform
# checks: https://mypy.readthedocs.io/en/stable/common_issues.html
if sys.platform == "win32" or sys.platform == "cygwin":
return
if os.getuid() != 0:
return
logger.warning(
"Running pip as the 'root' user can result in broken permissions and "
"conflicting behaviour with the system package manager. "
"It is recommended to use a virtual environment instead: "
"https://pip.pypa.io/warnings/venv"
)
def with_cleanup(func: Any) -> Any:
"""Decorator for common logic related to managing temporary
directories.
"""
def configure_tempdir_registry(registry: TempDirectoryTypeRegistry) -> None:
for t in KEEPABLE_TEMPDIR_TYPES:
registry.set_delete(t, False)
def wrapper(
self: RequirementCommand, options: Values, args: List[Any]
) -> Optional[int]:
assert self.tempdir_registry is not None
if options.no_clean:
configure_tempdir_registry(self.tempdir_registry)
try:
return func(self, options, args)
except PreviousBuildDirError:
# This kind of conflict can occur when the user passes an explicit
# build directory with a pre-existing folder. In that case we do
# not want to accidentally remove it.
configure_tempdir_registry(self.tempdir_registry)
raise
return wrapper
class RequirementCommand(IndexGroupCommand):
def __init__(self, *args: Any, **kw: Any) -> None:
super().__init__(*args, **kw)
self.cmd_opts.add_option(cmdoptions.no_clean())
@staticmethod
def determine_resolver_variant(options: Values) -> str:
"""Determines which resolver should be used, based on the given options."""
if "legacy-resolver" in options.deprecated_features_enabled:
return "legacy"
return "2020-resolver"
@staticmethod
def determine_build_failure_suppression(options: Values) -> bool:
"""Determines whether build failures should be suppressed and backtracked on."""
if "backtrack-on-build-failures" not in options.deprecated_features_enabled:
return False
if "legacy-resolver" in options.deprecated_features_enabled:
raise CommandError("Cannot backtrack with legacy resolver.")
deprecated(
reason=(
"Backtracking on build failures can mask issues related to how "
"a package generates metadata or builds a wheel. This flag will "
"be removed in pip 22.2."
),
gone_in=None,
replacement=(
"avoiding known-bad versions by explicitly telling pip to ignore them "
"(either directly as requirements, or via a constraints file)"
),
feature_flag=None,
issue=10655,
)
return True
@classmethod
def make_requirement_preparer(
cls,
temp_build_dir: TempDirectory,
options: Values,
build_tracker: BuildTracker,
session: PipSession,
finder: PackageFinder,
use_user_site: bool,
download_dir: Optional[str] = None,
verbosity: int = 0,
) -> RequirementPreparer:
"""
Create a RequirementPreparer instance for the given parameters.
"""
temp_build_dir_path = temp_build_dir.path
assert temp_build_dir_path is not None
resolver_variant = cls.determine_resolver_variant(options)
if resolver_variant == "2020-resolver":
lazy_wheel = "fast-deps" in options.features_enabled
if lazy_wheel:
logger.warning(
"pip is using lazily downloaded wheels using HTTP "
"range requests to obtain dependency information. "
"This experimental feature is enabled through "
"--use-feature=fast-deps and it is not ready for "
"production."
)
else:
lazy_wheel = False
if "fast-deps" in options.features_enabled:
logger.warning(
"fast-deps has no effect when used with the legacy resolver."
)
return RequirementPreparer(
build_dir=temp_build_dir_path,
src_dir=options.src_dir,
download_dir=download_dir,
build_isolation=options.build_isolation,
check_build_deps=options.check_build_deps,
build_tracker=build_tracker,
session=session,
progress_bar=options.progress_bar,
finder=finder,
require_hashes=options.require_hashes,
use_user_site=use_user_site,
lazy_wheel=lazy_wheel,
verbosity=verbosity,
)
@classmethod
def make_resolver(
cls,
preparer: RequirementPreparer,
finder: PackageFinder,
options: Values,
wheel_cache: Optional[WheelCache] = None,
use_user_site: bool = False,
ignore_installed: bool = True,
ignore_requires_python: bool = False,
force_reinstall: bool = False,
upgrade_strategy: str = "to-satisfy-only",
use_pep517: Optional[bool] = None,
py_version_info: Optional[Tuple[int, ...]] = None,
) -> BaseResolver:
"""
Create a Resolver instance for the given parameters.
"""
make_install_req = partial(
install_req_from_req_string,
isolated=options.isolated_mode,
use_pep517=use_pep517,
config_settings=getattr(options, "config_settings", None),
)
suppress_build_failures = cls.determine_build_failure_suppression(options)
resolver_variant = cls.determine_resolver_variant(options)
# The long import name and duplicated invocation is needed to convince
# Mypy into correctly typechecking. Otherwise it would complain the
# "Resolver" class being redefined.
if resolver_variant == "2020-resolver":
import pip._internal.resolution.resolvelib.resolver
return pip._internal.resolution.resolvelib.resolver.Resolver(
preparer=preparer,
finder=finder,
wheel_cache=wheel_cache,
make_install_req=make_install_req,
use_user_site=use_user_site,
ignore_dependencies=options.ignore_dependencies,
ignore_installed=ignore_installed,
ignore_requires_python=ignore_requires_python,
force_reinstall=force_reinstall,
upgrade_strategy=upgrade_strategy,
py_version_info=py_version_info,
suppress_build_failures=suppress_build_failures,
)
import pip._internal.resolution.legacy.resolver
return pip._internal.resolution.legacy.resolver.Resolver(
preparer=preparer,
finder=finder,
wheel_cache=wheel_cache,
make_install_req=make_install_req,
use_user_site=use_user_site,
ignore_dependencies=options.ignore_dependencies,
ignore_installed=ignore_installed,
ignore_requires_python=ignore_requires_python,
force_reinstall=force_reinstall,
upgrade_strategy=upgrade_strategy,
py_version_info=py_version_info,
)
def get_requirements(
self,
args: List[str],
options: Values,
finder: PackageFinder,
session: PipSession,
) -> List[InstallRequirement]:
"""
Parse command-line arguments into the corresponding requirements.
"""
requirements: List[InstallRequirement] = []
for filename in options.constraints:
for parsed_req in parse_requirements(
filename,
constraint=True,
finder=finder,
options=options,
session=session,
):
req_to_add = install_req_from_parsed_requirement(
parsed_req,
isolated=options.isolated_mode,
user_supplied=False,
)
requirements.append(req_to_add)
for req in args:
req_to_add = install_req_from_line(
req,
None,
isolated=options.isolated_mode,
use_pep517=options.use_pep517,
user_supplied=True,
config_settings=getattr(options, "config_settings", None),
)
requirements.append(req_to_add)
for req in options.editables:
req_to_add = install_req_from_editable(
req,
user_supplied=True,
isolated=options.isolated_mode,
use_pep517=options.use_pep517,
config_settings=getattr(options, "config_settings", None),
)
requirements.append(req_to_add)
# NOTE: options.require_hashes may be set if --require-hashes is True
for filename in options.requirements:
for parsed_req in parse_requirements(
filename, finder=finder, options=options, session=session
):
req_to_add = install_req_from_parsed_requirement(
parsed_req,
isolated=options.isolated_mode,
use_pep517=options.use_pep517,
user_supplied=True,
)
requirements.append(req_to_add)
# If any requirement has hash options, enable hash checking.
if any(req.has_hash_options for req in requirements):
options.require_hashes = True
if not (args or options.editables or options.requirements):
opts = {"name": self.name}
if options.find_links:
raise CommandError(
"You must give at least one requirement to {name} "
'(maybe you meant "pip {name} {links}"?)'.format(
**dict(opts, links=" ".join(options.find_links))
)
)
else:
raise CommandError(
"You must give at least one requirement to {name} "
'(see "pip help {name}")'.format(**opts)
)
return requirements
@staticmethod
def trace_basic_info(finder: PackageFinder) -> None:
"""
Trace basic information about the provided objects.
"""
# Display where finder is looking for packages
search_scope = finder.search_scope
locations = search_scope.get_formatted_locations()
if locations:
logger.info(locations)
def _build_package_finder(
self,
options: Values,
session: PipSession,
target_python: Optional[TargetPython] = None,
ignore_requires_python: Optional[bool] = None,
) -> PackageFinder:
"""
Create a package finder appropriate to this requirement command.
:param ignore_requires_python: Whether to ignore incompatible
"Requires-Python" values in links. Defaults to False.
"""
link_collector = LinkCollector.create(session, options=options)
selection_prefs = SelectionPreferences(
allow_yanked=True,
format_control=options.format_control,
allow_all_prereleases=options.pre,
prefer_binary=options.prefer_binary,
ignore_requires_python=ignore_requires_python,
)
return PackageFinder.create(
link_collector=link_collector,
selection_prefs=selection_prefs,
target_python=target_python,
use_deprecated_html5lib="html5lib" in options.deprecated_features_enabled,
)