Source code
Revision control
Copy as Markdown
Other Tools
#![warn(rust_2018_idioms)]
#![cfg(all(feature = "full", not(tokio_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());
}