laywerrobot/lib/python3.6/site-packages/pip/_internal/build_env.py
2020-08-27 21:55:39 +02:00

126 lines
4.1 KiB
Python

"""Build Environment used for isolation during sdist building
"""
import logging
import os
import sys
from distutils.sysconfig import get_python_lib
from sysconfig import get_paths
from pip._internal.utils.misc import call_subprocess
from pip._internal.utils.temp_dir import TempDirectory
from pip._internal.utils.ui import open_spinner
logger = logging.getLogger(__name__)
class BuildEnvironment(object):
"""Creates and manages an isolated environment to install build deps
"""
def __init__(self):
self._temp_dir = TempDirectory(kind="build-env")
self._temp_dir.create()
@property
def path(self):
return self._temp_dir.path
def __enter__(self):
self.save_path = os.environ.get('PATH', None)
self.save_pythonpath = os.environ.get('PYTHONPATH', None)
self.save_nousersite = os.environ.get('PYTHONNOUSERSITE', None)
install_scheme = 'nt' if (os.name == 'nt') else 'posix_prefix'
install_dirs = get_paths(install_scheme, vars={
'base': self.path,
'platbase': self.path,
})
scripts = install_dirs['scripts']
if self.save_path:
os.environ['PATH'] = scripts + os.pathsep + self.save_path
else:
os.environ['PATH'] = scripts + os.pathsep + os.defpath
# Note: prefer distutils' sysconfig to get the
# library paths so PyPy is correctly supported.
purelib = get_python_lib(plat_specific=0, prefix=self.path)
platlib = get_python_lib(plat_specific=1, prefix=self.path)
if purelib == platlib:
lib_dirs = purelib
else:
lib_dirs = purelib + os.pathsep + platlib
if self.save_pythonpath:
os.environ['PYTHONPATH'] = lib_dirs + os.pathsep + \
self.save_pythonpath
else:
os.environ['PYTHONPATH'] = lib_dirs
os.environ['PYTHONNOUSERSITE'] = '1'
return self.path
def __exit__(self, exc_type, exc_val, exc_tb):
def restore_var(varname, old_value):
if old_value is None:
os.environ.pop(varname, None)
else:
os.environ[varname] = old_value
restore_var('PATH', self.save_path)
restore_var('PYTHONPATH', self.save_pythonpath)
restore_var('PYTHONNOUSERSITE', self.save_nousersite)
def cleanup(self):
self._temp_dir.cleanup()
def install_requirements(self, finder, requirements, message):
args = [
sys.executable, '-m', 'pip', 'install', '--ignore-installed',
'--no-user', '--prefix', self.path, '--no-warn-script-location',
]
if logger.getEffectiveLevel() <= logging.DEBUG:
args.append('-v')
for format_control in ('no_binary', 'only_binary'):
formats = getattr(finder.format_control, format_control)
args.extend(('--' + format_control.replace('_', '-'),
','.join(sorted(formats or {':none:'}))))
if finder.index_urls:
args.extend(['-i', finder.index_urls[0]])
for extra_index in finder.index_urls[1:]:
args.extend(['--extra-index-url', extra_index])
else:
args.append('--no-index')
for link in finder.find_links:
args.extend(['--find-links', link])
for _, host, _ in finder.secure_origins:
args.extend(['--trusted-host', host])
if finder.allow_all_prereleases:
args.append('--pre')
if finder.process_dependency_links:
args.append('--process-dependency-links')
args.append('--')
args.extend(requirements)
with open_spinner(message) as spinner:
call_subprocess(args, show_stdout=False, spinner=spinner)
class NoOpBuildEnvironment(BuildEnvironment):
"""A no-op drop-in replacement for BuildEnvironment
"""
def __init__(self):
pass
def __enter__(self):
pass
def __exit__(self, exc_type, exc_val, exc_tb):
pass
def cleanup(self):
pass
def install_requirements(self, finder, requirements, message):
raise NotImplementedError()