From 1218766ea59bca383f68b2c622a8964cf55909eb Mon Sep 17 00:00:00 2001
From: Bas Schoenmaeckers <7943856+bschoenmaeckers@users.noreply.github.com>
Date: Mon, 13 May 2024 18:03:39 +0200
Subject: [PATCH] Clone individual files on windows ReFS (#3551)

Windows does not support cloning whole directories so clone each file
instead.

closes #3547

## Test Plan

Ran ` uv pip install setuptools --link-mode=clone` manually
---
 crates/install-wheel-rs/src/linker.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/crates/install-wheel-rs/src/linker.rs b/crates/install-wheel-rs/src/linker.rs
index 7a084c6d3318..8c0a2be8fbda 100644
--- a/crates/install-wheel-rs/src/linker.rs
+++ b/crates/install-wheel-rs/src/linker.rs
@@ -327,6 +327,15 @@ fn clone_recursive(
 
     debug!("Cloning {} to {}", from.display(), to.display());
 
+    if cfg!(windows) && from.is_dir() {
+        // On Windows, reflinking directories is not supported, so we copy each file instead.
+        fs::create_dir_all(&to)?;
+        for entry in fs::read_dir(from)? {
+            clone_recursive(site_packages, wheel, &entry?, attempt)?;
+        }
+        return Ok(());
+    }
+
     match attempt {
         Attempt::Initial => {
             if let Err(err) = reflink::reflink(&from, &to) {