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# Copyright 2020 Pants project contributors (see CONTRIBUTORS.md). | ||
# Licensed under the Apache License, Version 2.0 (see LICENSE). | ||
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from __future__ import absolute_import | ||
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import logging | ||
from argparse import ArgumentParser, Namespace | ||
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from pex import pex_bootstrapper | ||
from pex.interpreter import PythonInterpreter | ||
from pex.interpreter_constraints import UnsatisfiableInterpreterConstraintsError | ||
from pex.pex import PEX | ||
from pex.tools.command import Command, Error, JsonMixin, Ok, OutputMixin, Result | ||
from pex.typing import TYPE_CHECKING | ||
from pex.variables import ENV | ||
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if TYPE_CHECKING: | ||
from typing import Iterator | ||
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logger = logging.getLogger(__name__) | ||
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class Interpreter(JsonMixin, OutputMixin, Command): | ||
"""Prints the path of the preferred interpreter to run the given PEX file with, if any.""" | ||
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def add_arguments(self, parser): | ||
# type: (ArgumentParser) -> None | ||
self.add_output_option(parser, entity="Python interpreter path"), | ||
parser.add_argument( | ||
"-a", | ||
"--all", | ||
action="store_true", | ||
help="Print all compatible interpreters, preferred first.", | ||
) | ||
parser.add_argument( | ||
"-v", | ||
"--verbose", | ||
action="store_true", | ||
help="Print the interpreter requirement in addition to it's path.", | ||
) | ||
self.add_json_options(parser, entity="verbose output"), | ||
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@staticmethod | ||
def _find_interpreters( | ||
pex, # type: PEX | ||
all=False, # type: bool | ||
): | ||
# type: (...) -> Iterator[PythonInterpreter] | ||
if not all: | ||
yield pex.interpreter | ||
return | ||
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if ENV.PEX_PYTHON: | ||
logger.warning( | ||
"Ignoring PEX_PYTHON={} in order to scan for all compatible " | ||
"interpreters.".format(ENV.PEX_PYTHON) | ||
) | ||
for interpreter in pex_bootstrapper.iter_compatible_interpreters( | ||
path=ENV.PEX_PYTHON_PATH, | ||
interpreter_constraints=pex.pex_info().interpreter_constraints, | ||
): | ||
yield interpreter | ||
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def run( | ||
self, | ||
pex, # type: PEX | ||
options, # type: Namespace | ||
): | ||
# type: (...) -> Result | ||
if options.indent and not options.verbose: | ||
logger.warning( | ||
"Ignoring --indent={} since --verbose mode is not enabled.".format(options.indent) | ||
) | ||
with self.output(options) as out: | ||
try: | ||
for interpreter in self._find_interpreters(pex, all=options.all): | ||
if options.verbose: | ||
self.dump_json( | ||
options, | ||
{ | ||
"path": interpreter.binary, | ||
"requirement": str(interpreter.identity.requirement), | ||
"platform": str(interpreter.platform), | ||
}, | ||
out, | ||
) | ||
else: | ||
out.write(interpreter.binary) | ||
out.write("\n") | ||
except UnsatisfiableInterpreterConstraintsError as e: | ||
return Error(str(e)) | ||
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return Ok() |