tokio 1.30.0

An event-driven, non-blocking I/O platform for writing asynchronous I/O backed applications.
Documentation 
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#![warn(rust_2018_idioms)]
#![cfg(all(feature = "full", not(target_os = "wasi")))] // WASI does not support all fs operations

use tokio::fs;

use std::io::Write;
use tempfile::tempdir;

#[tokio::test]
async fn test_hard_link() {
    let dir = tempdir().unwrap();
    let src = dir.path().join("src.txt");
    let dst = dir.path().join("dst.txt");

    std::fs::File::create(&src)
        .unwrap()
        .write_all(b"hello")
        .unwrap();

    fs::hard_link(&src, &dst).await.unwrap();

    std::fs::File::create(&src)
        .unwrap()
        .write_all(b"new-data")
        .unwrap();

    let content = fs::read(&dst).await.unwrap();
    assert_eq!(content, b"new-data");

    // test that this is not a symlink:
    assert!(fs::read_link(&dst).await.is_err());
}

#[cfg(unix)]
#[tokio::test]
async fn test_symlink() {
    let dir = tempdir().unwrap();
    let src = dir.path().join("src.txt");
    let dst = dir.path().join("dst.txt");

    std::fs::File::create(&src)
        .unwrap()
        .write_all(b"hello")
        .unwrap();

    fs::symlink(&src, &dst).await.unwrap();

    std::fs::File::create(&src)
        .unwrap()
        .write_all(b"new-data")
        .unwrap();

    let content = fs::read(&dst).await.unwrap();
    assert_eq!(content, b"new-data");

    let read = fs::read_link(dst.clone()).await.unwrap();
    assert!(read == src);

    let symlink_meta = fs::symlink_metadata(dst.clone()).await.unwrap();
    assert!(symlink_meta.file_type().is_symlink());
}