Fix isolated environment call

Signed-off-by: Bernát Gábor <[email protected]>

src/build/env.py

@@ -6,10 +6,8 @@
 import sysconfig
 import tempfile
 import types
-
 from typing import Dict, Iterable, List, Optional, Sequence, Type
 
-
 if sys.version_info[0] == 2: # pragma: no cover
  FileExistsError = OSError
 
@@ -58,6 +56,7 @@ def __init__(self, remove_paths, _executable=sys.executable): # type: (Sequence
  self._path = None # type: Optional[str]
  self._remove_paths = [] # type: List[str]
  self._executable = _executable
+ self._old_executable = None # type: Optional[str]
 
  # normalize paths so that we can compare them -- required on case insensitive systems
  for path in remove_paths:
@@ -227,6 +226,8 @@ def __enter__(self): # type: () -> IsolatedEnvironment
  self._create_env_venv()
 
  self._pop_env('PIP_REQUIRE_VIRTUALENV')
+ # address https://github.com/pypa/pep517/pull/93
+ self._old_executable, sys.executable = sys.executable, self._executable
 
  return self
 
@@ -235,6 +236,8 @@ def __exit__(self, typ, value, traceback):
  """
  Restores the everything to the original state
  """
+ if self._old_executable is not None:
+ sys.executable = self._old_executable
  if self.path and os.path.isdir(self.path):
  shutil.rmtree(self.path)