Merge pull request #81 from rdeits/rd/environ

Pass the full environment to the subprocess rather than just PYTHONPATH

Author: rdeits

src/meshcat/servers/zmqserver.py

@@ -54,8 +54,11 @@ def start_zmq_server_as_subprocess(zmq_url=None, server_args=[]):
         args.append(*server_args)
     # Note: Pass PYTHONPATH to be robust to workflows like Google Colab,
     # where meshcat might have been added directly via sys.path.append.
-    env = {'PYTHONPATH': os.path.dirname(os.path.dirname(os.path.dirname(__file__)))}
-    kwargs = { 
+    # Copy existing environmental variables as some of them might be needed
+    # e.g. on Windows SYSTEMROOT and PATH
+    env = dict(os.environ)
+    env["PYTHONPATH"] = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
+    kwargs = {
         'stdout': subprocess.PIPE,
         'stderr': subprocess.PIPE,
         'env': env