Use Junction instead of symlink on windows (#284)

Signed-off-by: Simon Davies <simongdavies@users.noreply.github.com>

Author: simongdavies

src/hyperlight_wasm/Cargo.toml

@@ -97,6 +97,9 @@ anyhow = { version = "1.0" }
 goblin = "0.10.3"
 tar = "0.4.44"
 
+[target.'cfg(windows)'.build-dependencies]
+junction = "1"
+
 [features]
 default = ["function_call_metrics", "kvm", "mshv3"]
 function_call_metrics = ["hyperlight-host/function_call_metrics"]

src/hyperlight_wasm/build.rs

@@ -84,7 +84,7 @@ fn get_wasm_runtime_path() -> PathBuf {
     std::os::unix::fs::symlink(crates_dir, &vendor_dir).unwrap();
 
     #[cfg(not(unix))]
-    std::os::windows::fs::symlink_dir(crates_dir, &vendor_dir).unwrap();
+    junction::create(crates_dir, &vendor_dir).unwrap();
 
     let wasm_runtime_dir = crates_dir.join("wasm_runtime");
     if wasm_runtime_dir.exists() {