# The following comment should be removed at some point in the future. # mypy: strict-optional=False from __future__ import absolute_import import logging from pip._internal.utils.logging import indent_log from pip._internal.utils.typing import MYPY_CHECK_RUNNING from .req_file import parse_requirements from .req_install import InstallRequirement from .req_set import RequirementSet if MYPY_CHECK_RUNNING: from typing import Any, List, Sequence __all__ = [ "RequirementSet", "InstallRequirement", "parse_requirements", "install_given_reqs", ] logger = logging.getLogger(__name__) def install_given_reqs( to_install, # type: List[InstallRequirement] install_options, # type: List[str] global_options=(), # type: Sequence[str] *args, # type: Any **kwargs # type: Any ): # type: (...) -> List[InstallRequirement] """ Install everything in the given list. (to be called after having downloaded and unpacked the packages) """ if to_install: logger.info( 'Installing collected packages: %s', ', '.join([req.name for req in to_install]), ) with indent_log(): for requirement in to_install: if requirement.conflicts_with: logger.info( 'Found existing installation: %s', requirement.conflicts_with, ) with indent_log(): uninstalled_pathset = requirement.uninstall( auto_confirm=True ) try: requirement.install( install_options, global_options, *args, **kwargs ) except Exception: should_rollback = ( requirement.conflicts_with and not requirement.install_succeeded ) # if install did not succeed, rollback previous uninstall if should_rollback: uninstalled_pathset.rollback() raise else: should_commit = ( requirement.conflicts_with and requirement.install_succeeded ) if should_commit: uninstalled_pathset.commit() requirement.remove_temporary_source() return to_install