first version only dirs parralell

src/main.rs

@@ -0,0 +1,38 @@
+use rayon::prelude::*;
+use std::fs;
+use std::io;
+use std::path::Path;
+use std::os::unix;
+
+fn copy_recursive_hardlink_optimized(source: &Path, destination: &Path) -> io::Result<()> {
+    let metadata = fs::symlink_metadata(source)?;
+
+    if metadata.file_type().is_dir() {
+        fs::create_dir_all(destination)?;
+
+        let entries: Vec<_> = fs::read_dir(source)?.collect::<io::Result<Vec<_>>>()?;
+        entries.par_iter().try_for_each(|entry| {
+            let path = entry.path();
+            if let Some(file_name) = path.file_name() {
+                let dest_path = destination.join(file_name);
+                copy_recursive_hardlink_optimized(&path, &dest_path)
+            } else {
+                Ok(())
+            }
+        })?;
+    } else if metadata.file_type().is_file() {
+        fs::hard_link(source, destination)?;
+    } else if metadata.file_type().is_symlink() {
+        let target = fs::read_link(source)?;
+        unix::fs::symlink(target, destination)?;
+    }
+
+    Ok(())
+}
+
+fn main() -> io::Result<()> {
+    let source = Path::new("/usr/lib");
+    let destination = Path::new("/pkg/gnu/lib");
+    copy_recursive_hardlink_optimized(source, destination)?;
+    Ok(())
+}