Change tox to use the virtualenv bin instead of invoking it with the current interpreter. Virtualenv might have been installed with a completely different interpreter (and might not work at all!) or it could have other issues caused by invoking the module directly (virtualenv 1.11 known to break). Also add a `virtualenvbin` config option in case it need overriding.

3 files changed, 4 insertions, 12 deletions

diff --git a/tests/test_venv.py b/tests/test_venv.py
index 0ac8f90..77181d1 100644
--- a/tests/test_venv.py
+++ b/tests/test_venv.py
@@ -48,11 +48,8 @@ def test_create(monkeypatch, mocksession, newconfig):
     l = mocksession._pcalls
     assert len(l) >= 1
     args = l[0].args
-    assert "virtualenv" in str(args[1])
+    assert str(args[0]).endswith("virtualenv")
     if sys.platform != "win32":
-        # realpath is needed for stuff like the debian symlinks
-        assert py.path.local(sys.executable).realpath() \
-          == py.path.local(args[0]).realpath()
         #assert Envconfig.toxworkdir in args
         assert venv.getcommandpath("easy_install", cwd=py.path.local())
     interp = venv._getliveconfig().python
@@ -321,7 +318,7 @@ def test_install_python3(tmpdir, newmocksession):
     l = mocksession._pcalls
     assert len(l) == 1
     args = l[0].args
-    assert str(args[1]).endswith('virtualenv.py')
+    assert str(args[0]).endswith('virtualenv')
     l[:] = []
     action = mocksession.newaction(venv, "hello")
     venv._install(["hello"], action=action)
diff --git a/tox/_config.py b/tox/_config.py
index 6006fa9..928305c 100644
--- a/tox/_config.py
+++ b/tox/_config.py
@@ -357,6 +357,7 @@ class parseini:
                 ixserver = None
             name = self._replace_forced_dep(name, config)
             vc.deps.append(DepConfig(name, ixserver))
+        vc.virtualenvbin = reader.getdefault(section, "virtualenvbin", "virtualenv")
         vc.distribute = reader.getbool(section, "distribute", False)
         vc.sitepackages = self.config.option.sitepackages or \
                           reader.getbool(section, "sitepackages", False)
@@ -734,4 +735,3 @@ def getcontextname():
     if 'HUDSON_URL' in os.environ:
         return 'jenkins'
     return None
-
diff --git a/tox/_venv.py b/tox/_venv.py
index 58093fc..4ed7b47 100644
--- a/tox/_venv.py
+++ b/tox/_venv.py
@@ -178,13 +178,8 @@ class VirtualEnv(object):
         if action is None:
             action = self.session.newaction(self, "create")
 
-        interpreters = self.envconfig.config.interpreters
         config_interpreter = self.getsupportedinterpreter()
-        info = interpreters.get_info(executable=config_interpreter)
-        f, path, _ = py.std.imp.find_module("virtualenv")
-        f.close()
-        venvscript = path.rstrip("co")
-        args = [config_interpreter, str(venvscript)]
+        args = [self.envconfig.virtualenvbin]
         if self.envconfig.distribute:
             args.append("--distribute")
         else: