Do not symlink on Windows

Author: KoltesDigital

build_env.py

@@ -21,11 +21,10 @@
 import sys
 import textwrap
 import venv
-from typing import Dict, List, Optional
+from typing import Dict, List
 
 import importlib_metadata
 
-
 EnvFile = collections.namedtuple("EnvFile", ["path", "site_packages_path"])
 
 
@@ -112,7 +111,6 @@ def get_files(build_env_input: Dict) -> List[EnvFile]:
     for depfile in build_env_input["files"]:
         # Bucket files into external and workspace groups.
         # Only generated workspace files are kept.
-        type_ = depfile["t"]
         input_path = pathlib.Path(depfile["p"])
 
         # If this is a directory, expand to each recursive child.
@@ -144,9 +142,12 @@ def install_data_file(env_path: pathlib.Path, file: EnvFile) -> None:
 
 def install_site_file(site_packages_path: pathlib.Path, file: EnvFile) -> None:
     site_path = site_packages_path / file.site_packages_path
-    if not site_path.exists():
+    if not site_path.exists() and file.path.exists():
         site_path.parent.mkdir(parents=True, exist_ok=True)
-        site_path.symlink_to(file.path.resolve())
+        try:
+            site_path.symlink_to(file.path.resolve())
+        except OSError:
+            site_path.write_bytes(file.path.read_bytes())
 
 
 def install_files(env_path: pathlib.Path, files: List[EnvFile]) -> None:
@@ -246,7 +247,7 @@ def main():
         cwd = os.environ.get("BUILD_WORKING_DIRECTORY", os.getcwd())
         env_path = pathlib.Path(cwd) / pathlib.Path(sys.argv[1])
 
-    builder = venv.EnvBuilder(clear=True, symlinks=True, with_pip=True)
+    builder = venv.EnvBuilder(clear=True, symlinks=sys.platform != 'win32', with_pip=True)
     builder.create(str(env_path))
 
     install_files(env_path, files)