93 lines
2.7 KiB
Python
93 lines
2.7 KiB
Python
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"""Build Environment used for isolation during sdist building
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"""
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import os
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from distutils.sysconfig import get_python_lib
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from sysconfig import get_paths
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from pip._internal.utils.temp_dir import TempDirectory
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class BuildEnvironment(object):
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"""Creates and manages an isolated environment to install build deps
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"""
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def __init__(self, no_clean):
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self._temp_dir = TempDirectory(kind="build-env")
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self._no_clean = no_clean
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@property
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def path(self):
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return self._temp_dir.path
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def __enter__(self):
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self._temp_dir.create()
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self.save_path = os.environ.get('PATH', None)
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self.save_pythonpath = os.environ.get('PYTHONPATH', None)
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self.save_nousersite = os.environ.get('PYTHONNOUSERSITE', None)
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install_scheme = 'nt' if (os.name == 'nt') else 'posix_prefix'
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install_dirs = get_paths(install_scheme, vars={
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'base': self.path,
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'platbase': self.path,
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})
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scripts = install_dirs['scripts']
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if self.save_path:
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os.environ['PATH'] = scripts + os.pathsep + self.save_path
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else:
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os.environ['PATH'] = scripts + os.pathsep + os.defpath
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# Note: prefer distutils' sysconfig to get the
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# library paths so PyPy is correctly supported.
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purelib = get_python_lib(plat_specific=0, prefix=self.path)
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platlib = get_python_lib(plat_specific=1, prefix=self.path)
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if purelib == platlib:
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lib_dirs = purelib
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else:
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lib_dirs = purelib + os.pathsep + platlib
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if self.save_pythonpath:
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os.environ['PYTHONPATH'] = lib_dirs + os.pathsep + \
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self.save_pythonpath
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else:
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os.environ['PYTHONPATH'] = lib_dirs
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os.environ['PYTHONNOUSERSITE'] = '1'
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return self.path
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def __exit__(self, exc_type, exc_val, exc_tb):
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if not self._no_clean:
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self._temp_dir.cleanup()
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def restore_var(varname, old_value):
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if old_value is None:
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os.environ.pop(varname, None)
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else:
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os.environ[varname] = old_value
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restore_var('PATH', self.save_path)
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restore_var('PYTHONPATH', self.save_pythonpath)
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restore_var('PYTHONNOUSERSITE', self.save_nousersite)
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def cleanup(self):
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self._temp_dir.cleanup()
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class NoOpBuildEnvironment(BuildEnvironment):
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"""A no-op drop-in replacement for BuildEnvironment
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"""
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def __init__(self, no_clean):
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pass
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def __enter__(self):
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pass
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def __exit__(self, exc_type, exc_val, exc_tb):
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pass
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def cleanup(self):
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pass
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