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use std::fs;
use std::io;
use std::path::Path;
use futures::{Future, Poll};
/// Creates a new hard link on the filesystem.
///
/// 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.
///
/// This is an async version of [`std::fs::hard_link`][std]
///
/// [std]: https://doc.rust-lang.org/std/fs/fn.hard_link.html
pub fn hard_link<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> HardLinkFuture<P, Q> {
HardLinkFuture::new(src, dst)
}
/// Future returned by `hard_link`.
#[derive(Debug)]
pub struct HardLinkFuture<P, Q>
where
P: AsRef<Path>,
Q: AsRef<Path>
{
src: P,
dst: Q,
}
impl<P, Q> HardLinkFuture<P, Q>
where
P: AsRef<Path>,
Q: AsRef<Path>
{
fn new(src: P, dst: Q) -> HardLinkFuture<P, Q> {
HardLinkFuture {
src: src,
dst: dst,
}
}
}
impl<P, Q> Future for HardLinkFuture<P, Q>
where
P: AsRef<Path>,
Q: AsRef<Path>
{
type Item = ();
type Error = io::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
::blocking_io(|| fs::hard_link(&self.src, &self.dst) )
}
}
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