adding check for windows then using Scripts instead of bin

python/mach_bootstrap.py

@@ -92,7 +92,9 @@ def _activate_virtualenv(topdir):
     if python is None:
         sys.exit("Python is not installed. Please install it prior to running mach.")
 
-    activate_path = os.path.join(virtualenv_path, "bin", "activate_this.py")
+    # Virtualenv calls its scripts folder "bin" on linux/OSX but "Scripts" on Windows, detect which one then use that
+    script_dir = "Scripts" if os.name == "nt" else "bin"
+    activate_path = os.path.join(virtualenv_path, script_dir, "activate_this.py")
     if not (os.path.exists(virtualenv_path) and os.path.exists(activate_path)):
         virtualenv = _get_exec(*VIRTUALENV_NAMES)
         if virtualenv is None:

python/servo/bootstrap_commands.py

@@ -28,7 +28,7 @@ from mach.decorators import (
     Command,
 )
 
-from servo.command_base import CommandBase, cd, host_triple, use_nightly_rust, check_call, BIN_SUFFIX
+from servo.command_base import CommandBase, cd, host_triple, check_call, BIN_SUFFIX
 
 
 def download(desc, src, writer):

python/servo/command_base.py

@@ -16,9 +16,7 @@ import toml
 
 from mach.registrar import Registrar
 
-BIN_SUFFIX = ""
-if sys.platform == "win32":
-    BIN_SUFFIX = ".exe"
+BIN_SUFFIX = ".exe" if sys.platform == "win32" else ""
 
 
 @contextlib.contextmanager
@@ -59,10 +57,8 @@ def host_triple():
 
 
 def use_nightly_rust():
-    envvar = os.environ.get("SERVO_USE_NIGHTLY_RUST")
-    if envvar:
-        return envvar != "0"
-    return False
+    envvar = os.environ.get("SERVO_USE_NIGHTLY_RUST", "0")
+    return envvar != "0"
 
 
 def call(*args, **kwargs):
@@ -70,11 +66,9 @@ def call(*args, **kwargs):
     verbose = kwargs.pop('verbose', False)
     if verbose:
         print(' '.join(args[0]))
-    if sys.platform == "win32":
-        # we have to use shell=True in order to get PATH handling
-        # when looking for the binary on Windows
-        return subprocess.call(*args, shell=True, **kwargs)
-    return subprocess.call(*args, **kwargs)
+    # we have to use shell=True in order to get PATH handling
+    # when looking for the binary on Windows
+    return subprocess.call(*args, shell=sys.platform == 'win32', **kwargs)
 
 
 def check_call(*args, **kwargs):
@@ -82,11 +76,9 @@ def check_call(*args, **kwargs):
     verbose = kwargs.pop('verbose', False)
     if verbose:
         print(' '.join(args[0]))
-    if sys.platform == "win32":
-        # we have to use shell=True in order to get PATH handling
-        # when looking for the binary on Windows
-        return subprocess.check_call(*args, shell=True, **kwargs)
-    return subprocess.check_call(*args, **kwargs)
+    # we have to use shell=True in order to get PATH handling
+    # when looking for the binary on Windows
+    return subprocess.check_call(*args, shell=sys.platform == 'win32', **kwargs)
 
 
 class CommandBase(object):

python/servo/devenv_commands.py

@@ -10,6 +10,7 @@
 from __future__ import print_function, unicode_literals
 from os import path, getcwd, listdir
 
+import subprocess
 import sys
 
 from mach.decorators import (