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import itertools
import os
import shutil
import sys
from typing import List, Optional
from pip._internal.cli.main import main
from pip._internal.utils.compat import WINDOWS
_EXECUTABLE_NAMES = [
"pip",
f"pip{sys.version_info.major}",
f"pip{sys.version_info.major}.{sys.version_info.minor}",
]
if WINDOWS:
_allowed_extensions = {"", ".exe"}
_EXECUTABLE_NAMES = [
"".join(parts)
for parts in itertools.product(_EXECUTABLE_NAMES, _allowed_extensions)
]
def _wrapper(args: Optional[List[str]] = None) -> int:
"""Central wrapper for all old entrypoints.
Historically pip has had several entrypoints defined. Because of issues
arising from PATH, sys.path, multiple Pythons, their interactions, and most
of them having a pip installed, users suffer every time an entrypoint gets
moved.
To alleviate this pain, and provide a mechanism for warning users and
directing them to an appropriate place for help, we now define all of
our old entrypoints as wrappers for the current one.
"""
sys.stderr.write(
"WARNING: pip is being invoked by an old script wrapper. This will "
"fail in a future version of pip.\n"
"Please see https://github.com/pypa/pip/issues/5599 for advice on "
"fixing the underlying issue.\n"
"To avoid this problem you can invoke Python with '-m pip' instead of "
"running pip directly.\n"
)
return main(args)
def get_best_invocation_for_this_pip() -> str:
"""Try to figure out the best way to invoke pip in the current environment."""
binary_directory = "Scripts" if WINDOWS else "bin"
binary_prefix = os.path.join(sys.prefix, binary_directory)
# Try to use pip[X[.Y]] names, if those executables for this environment are
# the first on PATH with that name.
path_parts = os.path.normcase(os.environ.get("PATH", "")).split(os.pathsep)
exe_are_in_PATH = os.path.normcase(binary_prefix) in path_parts
if exe_are_in_PATH:
for exe_name in _EXECUTABLE_NAMES:
found_executable = shutil.which(exe_name)
binary_executable = os.path.join(binary_prefix, exe_name)
if (
found_executable
and os.path.exists(binary_executable)
and os.path.samefile(
found_executable,
binary_executable,
)
):
return exe_name
# Use the `-m` invocation, if there's no "nice" invocation.
return f"{get_best_invocation_for_this_python()} -m pip"
def get_best_invocation_for_this_python() -> str:
"""Try to figure out the best way to invoke the current Python."""
exe = sys.executable
exe_name = os.path.basename(exe)
# Try to use the basename, if it's the first executable.
found_executable = shutil.which(exe_name)
if found_executable and os.path.samefile(found_executable, exe):
return exe_name
# Use the full executable name, because we couldn't find something simpler.
return exe