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-rw-r--r--src/engine/SCons/Platform/virtualenv.py120
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diff --git a/src/engine/SCons/Platform/virtualenv.py b/src/engine/SCons/Platform/virtualenv.py
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+"""SCons.Platform.virtualenv
+
+Support for virtualenv.
+"""
+
+#
+# Copyright (c) 2001 - 2019 The SCons Foundation
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "src/engine/SCons/Platform/virtualenv.py 103260fce95bf5db1c35fb2371983087d85dd611 2019-07-13 18:25:30 bdbaddog"
+
+import os
+import sys
+import SCons.Util
+
+
+virtualenv_enabled_by_default = False
+
+
+def _enable_virtualenv_default():
+ return SCons.Util.get_os_env_bool('SCONS_ENABLE_VIRTUALENV', virtualenv_enabled_by_default)
+
+
+def _ignore_virtualenv_default():
+ return SCons.Util.get_os_env_bool('SCONS_IGNORE_VIRTUALENV', False)
+
+
+enable_virtualenv = _enable_virtualenv_default()
+ignore_virtualenv = _ignore_virtualenv_default()
+virtualenv_variables = ['VIRTUAL_ENV', 'PIPENV_ACTIVE']
+
+
+def _running_in_virtualenv():
+ """Returns True, if scons is executed within a virtualenv"""
+ # see https://stackoverflow.com/a/42580137
+ return (hasattr(sys, 'real_prefix') or
+ (hasattr(sys, 'base_prefix') and sys.base_prefix != sys.prefix))
+
+
+def _is_path_in(path, base):
+ """Returns true, if **path** is located under the **base** directory."""
+ if not path or not base: # empty path may happen, base too
+ return False
+ rp = os.path.relpath(path, base)
+ return ((not rp.startswith(os.path.pardir)) and (not rp == os.path.curdir))
+
+
+def _inject_venv_variables(env):
+ if 'ENV' not in env:
+ env['ENV'] = {}
+ ENV = env['ENV']
+ for name in virtualenv_variables:
+ try:
+ ENV[name] = os.environ[name]
+ except KeyError:
+ pass
+
+def _inject_venv_path(env, path_list=None):
+ """Modify environment such that SCons will take into account its virtualenv
+ when running external tools."""
+ if path_list is None:
+ path_list = os.getenv('PATH')
+ env.PrependENVPath('PATH', select_paths_in_venv(path_list))
+
+
+def select_paths_in_venv(path_list):
+ """Returns a list of paths from **path_list** which are under virtualenv's
+ home directory."""
+ if SCons.Util.is_String(path_list):
+ path_list = path_list.split(os.path.pathsep)
+ # Find in path_list the paths under the virtualenv's home
+ return [path for path in path_list if IsInVirtualenv(path)]
+
+
+def ImportVirtualenv(env):
+ """Copies virtualenv-related environment variables from OS environment
+ to ``env['ENV']`` and prepends virtualenv's PATH to ``env['ENV']['PATH']``.
+ """
+ _inject_venv_variables(env)
+ _inject_venv_path(env)
+
+
+def Virtualenv():
+ """Returns path to the virtualenv home if scons is executing within a
+ virtualenv or None, if not."""
+ if _running_in_virtualenv():
+ return sys.prefix
+ return None
+
+
+def IsInVirtualenv(path):
+ """Returns True, if **path** is under virtualenv's home directory. If not,
+ or if we don't use virtualenv, returns False."""
+ return _is_path_in(path, Virtualenv())
+
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: