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"""Build Environment used for isolation during sdist building
"""
import contextlib
import logging
import os
import pathlib
import sys
import textwrap
import zipfile
from collections import OrderedDict
from sysconfig import get_paths
from types import TracebackType
from typing import TYPE_CHECKING, Iterable, Iterator, List, Optional, Set, Tuple, Type
from pip._vendor.certifi import where
from pip._vendor.packaging.requirements import Requirement
from pip._vendor.packaging.version import Version
from pip import __file__ as pip_location
from pip._internal.cli.spinners import open_spinner
from pip._internal.locations import get_platlib, get_prefixed_libs, get_purelib
from pip._internal.metadata import get_environment
from pip._internal.utils.subprocess import call_subprocess
from pip._internal.utils.temp_dir import TempDirectory, tempdir_kinds
if TYPE_CHECKING:
from pip._internal.index.package_finder import PackageFinder
logger = logging.getLogger(__name__)
class _Prefix:
def __init__(self, path: str) -> None:
self.path = path
self.setup = False
self.bin_dir = get_paths(
"nt" if os.name == "nt" else "posix_prefix",
vars={"base": path, "platbase": path},
)["scripts"]
self.lib_dirs = get_prefixed_libs(path)
@contextlib.contextmanager
def _create_standalone_pip() -> Iterator[str]:
"""Create a "standalone pip" zip file.
The zip file's content is identical to the currently-running pip.
It will be used to install requirements into the build environment.
"""
source = pathlib.Path(pip_location).resolve().parent
# Return the current instance if `source` is not a directory. We can't build
# a zip from this, and it likely means the instance is already standalone.
if not source.is_dir():
yield str(source)
return
with TempDirectory(kind="standalone-pip") as tmp_dir:
pip_zip = os.path.join(tmp_dir.path, "__env_pip__.zip")
kwargs = {}
if sys.version_info >= (3, 8):
kwargs["strict_timestamps"] = False
with zipfile.ZipFile(pip_zip, "w", **kwargs) as zf:
for child in source.rglob("*"):
zf.write(child, child.relative_to(source.parent).as_posix())
yield os.path.join(pip_zip, "pip")
class BuildEnvironment:
"""Creates and manages an isolated environment to install build deps"""
def __init__(self) -> None:
temp_dir = TempDirectory(kind=tempdir_kinds.BUILD_ENV, globally_managed=True)
self._prefixes = OrderedDict(
(name, _Prefix(os.path.join(temp_dir.path, name)))
for name in ("normal", "overlay")
)
self._bin_dirs: List[str] = []
self._lib_dirs: List[str] = []
for prefix in reversed(list(self._prefixes.values())):
self._bin_dirs.append(prefix.bin_dir)
self._lib_dirs.extend(prefix.lib_dirs)
# Customize site to:
# - ensure .pth files are honored
# - prevent access to system site packages
system_sites = {
os.path.normcase(site) for site in (get_purelib(), get_platlib())
}
self._site_dir = os.path.join(temp_dir.path, "site")
if not os.path.exists(self._site_dir):
os.mkdir(self._site_dir)
with open(os.path.join(self._site_dir, "sitecustomize.py"), "w") as fp:
fp.write(
textwrap.dedent(
"""
import os, site, sys
# First, drop system-sites related paths.
original_sys_path = sys.path[:]
known_paths = set()
for path in {system_sites!r}:
site.addsitedir(path, known_paths=known_paths)
system_paths = set(
os.path.normcase(path)
for path in sys.path[len(original_sys_path):]
)
original_sys_path = [
path for path in original_sys_path
if os.path.normcase(path) not in system_paths
]
sys.path = original_sys_path
# Second, add lib directories.
# ensuring .pth file are processed.
for path in {lib_dirs!r}:
assert not path in sys.path
site.addsitedir(path)
"""
).format(system_sites=system_sites, lib_dirs=self._lib_dirs)
)
def __enter__(self) -> None:
self._save_env = {
name: os.environ.get(name, None)
for name in ("PATH", "PYTHONNOUSERSITE", "PYTHONPATH")
}
path = self._bin_dirs[:]
old_path = self._save_env["PATH"]
if old_path:
path.extend(old_path.split(os.pathsep))
pythonpath = [self._site_dir]
os.environ.update(
{
"PATH": os.pathsep.join(path),
"PYTHONNOUSERSITE": "1",
"PYTHONPATH": os.pathsep.join(pythonpath),
}
)
def __exit__(
self,
exc_type: Optional[Type[BaseException]],
exc_val: Optional[BaseException],
exc_tb: Optional[TracebackType],
) -> None:
for varname, old_value in self._save_env.items():
if old_value is None:
os.environ.pop(varname, None)
else:
os.environ[varname] = old_value
def check_requirements(
self, reqs: Iterable[str]
) -> Tuple[Set[Tuple[str, str]], Set[str]]:
"""Return 2 sets:
- conflicting requirements: set of (installed, wanted) reqs tuples
- missing requirements: set of reqs
"""
missing = set()
conflicting = set()
if reqs:
env = get_environment(self._lib_dirs)
for req_str in reqs:
req = Requirement(req_str)
dist = env.get_distribution(req.name)
if not dist:
missing.add(req_str)
continue
if isinstance(dist.version, Version):
installed_req_str = f"{req.name}=={dist.version}"
else:
installed_req_str = f"{req.name}==={dist.version}"
if dist.version not in req.specifier:
conflicting.add((installed_req_str, req_str))
# FIXME: Consider direct URL?
return conflicting, missing
def install_requirements(
self,
finder: "PackageFinder",
requirements: Iterable[str],
prefix_as_string: str,
message: str,
) -> None:
prefix = self._prefixes[prefix_as_string]
assert not prefix.setup
prefix.setup = True
if not requirements:
return
with contextlib.ExitStack() as ctx:
# TODO: Remove this block when dropping 3.6 support. Python 3.6
# lacks importlib.resources and pep517 has issues loading files in
# a zip, so we fallback to the "old" method by adding the current
# pip directory to the child process's sys.path.
if sys.version_info < (3, 7):
pip_runnable = os.path.dirname(pip_location)
else:
pip_runnable = ctx.enter_context(_create_standalone_pip())
self._install_requirements(
pip_runnable,
finder,
requirements,
prefix,
message,
)
@staticmethod
def _install_requirements(
pip_runnable: str,
finder: "PackageFinder",
requirements: Iterable[str],
prefix: _Prefix,
message: str,
) -> None:
args: List[str] = [
sys.executable,
pip_runnable,
"install",
"--ignore-installed",
"--no-user",
"--prefix",
prefix.path,
"--no-warn-script-location",
]
if logger.getEffectiveLevel() <= logging.DEBUG:
args.append("-v")
for format_control in ("no_binary", "only_binary"):
formats = getattr(finder.format_control, format_control)
args.extend(
(
"--" + format_control.replace("_", "-"),
",".join(sorted(formats or {":none:"})),
)
)
index_urls = finder.index_urls
if index_urls:
args.extend(["-i", index_urls[0]])
for extra_index in index_urls[1:]:
args.extend(["--extra-index-url", extra_index])
else:
args.append("--no-index")
for link in finder.find_links:
args.extend(["--find-links", link])
for host in finder.trusted_hosts:
args.extend(["--trusted-host", host])
if finder.allow_all_prereleases:
args.append("--pre")
if finder.prefer_binary:
args.append("--prefer-binary")
args.append("--")
args.extend(requirements)
extra_environ = {"_PIP_STANDALONE_CERT": where()}
with open_spinner(message) as spinner:
call_subprocess(args, spinner=spinner, extra_environ=extra_environ)
class NoOpBuildEnvironment(BuildEnvironment):
"""A no-op drop-in replacement for BuildEnvironment"""
def __init__(self) -> None:
pass
def __enter__(self) -> None:
pass
def __exit__(
self,
exc_type: Optional[Type[BaseException]],
exc_val: Optional[BaseException],
exc_tb: Optional[TracebackType],
) -> None:
pass
def cleanup(self) -> None:
pass
def install_requirements(
self,
finder: "PackageFinder",
requirements: Iterable[str],
prefix_as_string: str,
message: str,
) -> None:
raise NotImplementedError()
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