115 lines
3.8 KiB
Python
Vendored
115 lines
3.8 KiB
Python
Vendored
# MIT License
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#
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# Copyright The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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"""'Platform" support for a Python virtualenv."""
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import os
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import sys
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import SCons.Util
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virtualenv_enabled_by_default = False
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def _enable_virtualenv_default():
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return SCons.Util.get_os_env_bool('SCONS_ENABLE_VIRTUALENV', virtualenv_enabled_by_default)
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def _ignore_virtualenv_default():
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return SCons.Util.get_os_env_bool('SCONS_IGNORE_VIRTUALENV', False)
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enable_virtualenv = _enable_virtualenv_default()
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ignore_virtualenv = _ignore_virtualenv_default()
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virtualenv_variables = ['VIRTUAL_ENV', 'PIPENV_ACTIVE']
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def _running_in_virtualenv():
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"""Returns True if scons is executed within a virtualenv"""
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# see https://stackoverflow.com/a/42580137
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return (hasattr(sys, 'real_prefix') or
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(hasattr(sys, 'base_prefix') and sys.base_prefix != sys.prefix))
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def _is_path_in(path, base):
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"""Returns true if **path** is located under the **base** directory."""
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if not path or not base: # empty path may happen, base too
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return False
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rp = os.path.relpath(path, base)
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return (not rp.startswith(os.path.pardir)) and (not rp == os.path.curdir)
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def _inject_venv_variables(env):
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if 'ENV' not in env:
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env['ENV'] = {}
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ENV = env['ENV']
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for name in virtualenv_variables:
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try:
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ENV[name] = os.environ[name]
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except KeyError:
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pass
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def _inject_venv_path(env, path_list=None):
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"""Modify environment such that SCons will take into account its virtualenv
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when running external tools."""
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if path_list is None:
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path_list = os.getenv('PATH')
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env.PrependENVPath('PATH', select_paths_in_venv(path_list))
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def select_paths_in_venv(path_list):
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"""Returns a list of paths from **path_list** which are under virtualenv's
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home directory."""
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if SCons.Util.is_String(path_list):
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path_list = path_list.split(os.path.pathsep)
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# Find in path_list the paths under the virtualenv's home
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return [path for path in path_list if IsInVirtualenv(path)]
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def ImportVirtualenv(env):
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"""Copies virtualenv-related environment variables from OS environment
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to ``env['ENV']`` and prepends virtualenv's PATH to ``env['ENV']['PATH']``.
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"""
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_inject_venv_variables(env)
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_inject_venv_path(env)
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def Virtualenv():
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"""Returns path to the virtualenv home if scons is executing within a
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virtualenv or None, if not."""
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if _running_in_virtualenv():
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return sys.prefix
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return None
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def IsInVirtualenv(path):
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"""Returns True, if **path** is under virtualenv's home directory. If not,
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or if we don't use virtualenv, returns False."""
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return _is_path_in(path, Virtualenv())
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# Local Variables:
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# tab-width:4
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# indent-tabs-mode:nil
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# End:
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# vim: set expandtab tabstop=4 shiftwidth=4:
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