run_node.py don't error if symlink exists (#279)

The switch from deno2/ to src/ made Travis's cached symlink invalid and
now os.path.exists() returns false.

1 files changed, 12 insertions, 7 deletions

diff --git a/src/js/run_node.py b/src/js/run_node.py
index 1a69dc502..3125bfc2f 100755
--- a/src/js/run_node.py
+++ b/src/js/run_node.py
@@ -10,22 +10,27 @@ import os
 
 def symlink(target, name, target_is_dir=False):
   if os.name == "nt":
-    from ctypes import windll, WinError
-    CreateSymbolicLinkW = windll.kernel32.CreateSymbolicLinkW
+    import ctypes
+    CreateSymbolicLinkW = ctypes.windll.kernel32.CreateSymbolicLinkW
+    CreateSymbolicLinkW.restype = ctypes.c_ubyte
+    CreateSymbolicLinkW.argtypes = (ctypes.c_wchar_p,
+                                    ctypes.c_wchar_p,
+                                    ctypes.c_uint32)
+
     flags = 0x02  # SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE
     if (target_is_dir):
       flags |= 0x01  # SYMBOLIC_LINK_FLAG_DIRECTORY
-    if not CreateSymbolicLinkW(name.encode('utf-16le'),
-                               target.encode('utf-16le'),
-                               flags):
-      raise WinError()
+    if not CreateSymbolicLinkW(name, target, flags):
+      raise ctypes.WinError()
   else:
     os.symlink(target, name)
 
 js_path = os.path.dirname(os.path.realpath(__file__))
 node_modules_path = os.path.join(js_path, "node_modules")
 
-if not os.path.exists("node_modules"):
+if not os.path.lexists("node_modules"):
+  if os.path.exists("node_modules"):
+    os.unlink("node_modules")
   symlink(node_modules_path, "node_modules", True)
 
 args = ["node"] + sys.argv[1:]