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- """Primary application entrypoint.
- """
- import locale
- import logging
- import os
- import sys
- from typing import List, Optional
- from pip._internal.cli.autocompletion import autocomplete
- from pip._internal.cli.main_parser import parse_command
- from pip._internal.commands import create_command
- from pip._internal.exceptions import PipError
- from pip._internal.utils import deprecation
- logger = logging.getLogger(__name__)
- # Do not import and use main() directly! Using it directly is actively
- # discouraged by pip's maintainers. The name, location and behavior of
- # this function is subject to change, so calling it directly is not
- # portable across different pip versions.
- # In addition, running pip in-process is unsupported and unsafe. This is
- # elaborated in detail at
- # https://pip.pypa.io/en/stable/user_guide/#using-pip-from-your-program.
- # That document also provides suggestions that should work for nearly
- # all users that are considering importing and using main() directly.
- # However, we know that certain users will still want to invoke pip
- # in-process. If you understand and accept the implications of using pip
- # in an unsupported manner, the best approach is to use runpy to avoid
- # depending on the exact location of this entry point.
- # The following example shows how to use runpy to invoke pip in that
- # case:
- #
- # sys.argv = ["pip", your, args, here]
- # runpy.run_module("pip", run_name="__main__")
- #
- # Note that this will exit the process after running, unlike a direct
- # call to main. As it is not safe to do any processing after calling
- # main, this should not be an issue in practice.
- def main(args=None):
- # type: (Optional[List[str]]) -> int
- if args is None:
- args = sys.argv[1:]
- # Configure our deprecation warnings to be sent through loggers
- deprecation.install_warning_logger()
- autocomplete()
- try:
- cmd_name, cmd_args = parse_command(args)
- except PipError as exc:
- sys.stderr.write(f"ERROR: {exc}")
- sys.stderr.write(os.linesep)
- sys.exit(1)
- # Needed for locale.getpreferredencoding(False) to work
- # in pip._internal.utils.encoding.auto_decode
- try:
- locale.setlocale(locale.LC_ALL, "")
- except locale.Error as e:
- # setlocale can apparently crash if locale are uninitialized
- logger.debug("Ignoring error %s when setting locale", e)
- command = create_command(cmd_name, isolated=("--isolated" in cmd_args))
- return command.main(cmd_args)
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