1 files changed, 46 insertions, 0 deletions
diff --git a/third_party/rust/tokio/src/fs/hard_link.rs b/third_party/rust/tokio/src/fs/hard_link.rs
new file mode 100644
index 0000000000..50cc17d286
--- /dev/null
+++ b/third_party/rust/tokio/src/fs/hard_link.rs
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+use crate::fs::asyncify;
+
+use std::io;
+use std::path::Path;
+
+/// Creates a new hard link on the filesystem.
+///
+/// This is an async version of [`std::fs::hard_link`][std]
+///
+/// [std]: std::fs::hard_link
+///
+/// The `dst` path will be a link pointing to the `src` path. Note that systems
+/// often require these two paths to both be located on the same filesystem.
+///
+/// # Platform-specific behavior
+///
+/// This function currently corresponds to the `link` function on Unix
+/// and the `CreateHardLink` function on Windows.
+/// Note that, this [may change in the future][changes].
+///
+/// [changes]: https://doc.rust-lang.org/std/io/index.html#platform-specific-behavior
+///
+/// # Errors
+///
+/// This function will return an error in the following situations, but is not
+/// limited to just these cases:
+///
+/// * The `src` path is not a file or doesn't exist.
+///
+/// # Examples
+///
+/// ```no_run
+/// use tokio::fs;
+///
+/// #[tokio::main]
+/// async fn main() -> std::io::Result<()> {
+///     fs::hard_link("a.txt", "b.txt").await?; // Hard link a.txt to b.txt
+///     Ok(())
+/// }
+/// ```
+pub async fn hard_link(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> io::Result<()> {
+    let src = src.as_ref().to_owned();
+    let dst = dst.as_ref().to_owned();
+
+    asyncify(move || std::fs::hard_link(src, dst)).await
+}