change windows call to not always call shell

cibuildwheel/windows.py

@@ -1,4 +1,5 @@
 import os
+import shlex
 import shutil
 import subprocess
 import sys
@@ -19,10 +20,14 @@
 IS_RUNNING_ON_TRAVIS = os.environ.get('TRAVIS_OS_NAME') == 'windows'
 
 
-def call(args, env=None, cwd=None):
-    print('+ ' + ' '.join(args))
-    return subprocess.check_call(' '.join(args), env=env, cwd=cwd, shell=True)
+def call(args, env=None, cwd=None, shell=False):
+    # print the command executing for the logs
+    if shell:
+        print('+ %s' % args)
+    else:
+        print('+ ' + ' '.join(shlex.quote(a) for a in args))
 
+    return subprocess.check_call(args, env=env, cwd=cwd, shell=shell)
 
 def get_nuget_args(version, arch):
     python_name = 'python' if version[0] == '3' else 'python2'
@@ -165,7 +170,7 @@ def build(project_dir, output_dir, test_command, before_test, test_requires, tes
         # run the before_build command
         if before_build:
             before_build_prepared = prepare_command(before_build, project=abs_project_dir)
-            call([before_build_prepared], env=env)
+            call([before_build_prepared], env=env, shell=True)
 
         # build the wheel
         if os.path.exists(built_wheel_dir):
@@ -183,7 +188,7 @@ def build(project_dir, output_dir, test_command, before_test, test_requires, tes
             shutil.move(built_wheel, repaired_wheel_dir)
         else:
             repair_command_prepared = prepare_command(repair_command, wheel=built_wheel, dest_dir=repaired_wheel_dir)
-            call([repair_command_prepared], env=env)
+            call([repair_command_prepared], env=env, shell=True)
         repaired_wheel = glob(os.path.join(repaired_wheel_dir, '*.whl'))[0]
 
         if test_command:
@@ -213,7 +218,7 @@ def build(project_dir, output_dir, test_command, before_test, test_requires, tes
 
             if before_test:
                 before_test_prepared = prepare_command(before_test, project=abs_project_dir)
-                call([before_test_prepared], env=virtualenv_env)
+                call([before_test_prepared], env=virtualenv_env, shell=True)
 
             # install the wheel
             call(['pip', 'install', repaired_wheel + test_extras], env=virtualenv_env)
@@ -226,7 +231,7 @@ def build(project_dir, output_dir, test_command, before_test, test_requires, tes
             # (this ensures that Python runs the tests against the installed wheel
             # and not the repo code)
             test_command_prepared = prepare_command(test_command, project=abs_project_dir)
-            call([test_command_prepared], cwd='c:\\', env=virtualenv_env)
+            call([test_command_prepared], cwd='c:\\', env=virtualenv_env, shell=True)
 
             # clean up
             shutil.rmtree(venv_dir)