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Viewing File: __init__.py
import logging
import os
from functools import partial
from ..app_data import make_app_data
from ..config.cli.parser import VirtualEnvConfigParser
from ..report import LEVELS, setup_report
from ..run.session import Session
from ..seed.wheels.periodic_update import manual_upgrade
from ..version import __version__
from .plugin.activators import ActivationSelector
from .plugin.creators import CreatorSelector
from .plugin.discovery import get_discover
from .plugin.seeders import SeederSelector
def cli_run(args, options=None, setup_logging=True, env=None):
"""
Create a virtual environment given some command line interface arguments.
:param args: the command line arguments
:param options: passing in a ``VirtualEnvOptions`` object allows return of the parsed options
:param setup_logging: ``True`` if setup logging handlers, ``False`` to use handlers already registered
:param env: environment variables to use
:return: the session object of the creation (its structure for now is experimental and might change on short notice)
"""
env = os.environ if env is None else env
of_session = session_via_cli(args, options, setup_logging, env)
with of_session:
of_session.run()
return of_session
def session_via_cli(args, options=None, setup_logging=True, env=None):
"""
Create a virtualenv session (same as cli_run, but this does not perform the creation). Use this if you just want to
query what the virtual environment would look like, but not actually create it.
:param args: the command line arguments
:param options: passing in a ``VirtualEnvOptions`` object allows return of the parsed options
:param setup_logging: ``True`` if setup logging handlers, ``False`` to use handlers already registered
:param env: environment variables to use
:return: the session object of the creation (its structure for now is experimental and might change on short notice)
"""
env = os.environ if env is None else env
parser, elements = build_parser(args, options, setup_logging, env)
options = parser.parse_args(args)
creator, seeder, activators = tuple(e.create(options) for e in elements) # create types
of_session = Session(options.verbosity, options.app_data, parser._interpreter, creator, seeder, activators)
return of_session
def build_parser(args=None, options=None, setup_logging=True, env=None):
parser = VirtualEnvConfigParser(options, os.environ if env is None else env)
add_version_flag(parser)
parser.add_argument(
"--with-traceback",
dest="with_traceback",
action="store_true",
default=False,
help="on failure also display the stacktrace internals of virtualenv",
)
_do_report_setup(parser, args, setup_logging)
options = load_app_data(args, parser, options)
handle_extra_commands(options)
discover = get_discover(parser, args)
parser._interpreter = interpreter = discover.interpreter
if interpreter is None:
raise RuntimeError(f"failed to find interpreter for {discover}")
elements = [
CreatorSelector(interpreter, parser),
SeederSelector(interpreter, parser),
ActivationSelector(interpreter, parser),
]
options, _ = parser.parse_known_args(args)
for element in elements:
element.handle_selected_arg_parse(options)
parser.enable_help()
return parser, elements
def build_parser_only(args=None):
"""Used to provide a parser for the doc generation"""
return build_parser(args)[0]
def handle_extra_commands(options):
if options.upgrade_embed_wheels:
result = manual_upgrade(options.app_data, options.env)
raise SystemExit(result)
def load_app_data(args, parser, options):
parser.add_argument(
"--read-only-app-data",
action="store_true",
help="use app data folder in read-only mode (write operations will fail with error)",
)
options, _ = parser.parse_known_args(args, namespace=options)
# here we need a write-able application data (e.g. the zipapp might need this for discovery cache)
parser.add_argument(
"--app-data",
help="a data folder used as cache by the virtualenv",
type=partial(make_app_data, read_only=options.read_only_app_data, env=options.env),
default=make_app_data(None, read_only=options.read_only_app_data, env=options.env),
)
parser.add_argument(
"--reset-app-data",
action="store_true",
help="start with empty app data folder",
)
parser.add_argument(
"--upgrade-embed-wheels",
action="store_true",
help="trigger a manual update of the embedded wheels",
)
options, _ = parser.parse_known_args(args, namespace=options)
if options.reset_app_data:
options.app_data.reset()
return options
def add_version_flag(parser):
import virtualenv
parser.add_argument(
"--version",
action="version",
version=f"%(prog)s {__version__} from {virtualenv.__file__}",
help="display the version of the virtualenv package and its location, then exit",
)
def _do_report_setup(parser, args, setup_logging):
level_map = ", ".join(f"{logging.getLevelName(l)}={c}" for c, l in sorted(LEVELS.items()))
msg = "verbosity = verbose - quiet, default {}, mapping => {}"
verbosity_group = parser.add_argument_group(
title="verbosity",
description=msg.format(logging.getLevelName(LEVELS[3]), level_map),
)
verbosity = verbosity_group.add_mutually_exclusive_group()
verbosity.add_argument("-v", "--verbose", action="count", dest="verbose", help="increase verbosity", default=2)
verbosity.add_argument("-q", "--quiet", action="count", dest="quiet", help="decrease verbosity", default=0)
option, _ = parser.parse_known_args(args)
if setup_logging:
setup_report(option.verbosity)
__all__ = [
"cli_run",
"session_via_cli",
]
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