1 files changed, 48 insertions, 0 deletions
diff --git a/third_party/rust/tokio-fs/src/set_permissions.rs b/third_party/rust/tokio-fs/src/set_permissions.rs
new file mode 100644
index 0000000000..a850448626
--- /dev/null
+++ b/third_party/rust/tokio-fs/src/set_permissions.rs
@@ -0,0 +1,48 @@
+use std::fs;
+use std::io;
+use std::path::Path;
+
+use futures::{Future, Poll};
+
+/// Changes the permissions found on a file or a directory.
+///
+/// This is an async version of [`std::fs::set_permissions`][std]
+///
+/// [std]: https://doc.rust-lang.org/std/fs/fn.set_permissions.html
+pub fn set_permissions<P: AsRef<Path>>(path: P, perm: fs::Permissions) -> SetPermissionsFuture<P> {
+    SetPermissionsFuture::new(path, perm)
+}
+
+/// Future returned by `set_permissions`.
+#[derive(Debug)]
+pub struct SetPermissionsFuture<P>
+where
+    P: AsRef<Path>
+{
+    path: P,
+    perm: fs::Permissions,
+}
+
+impl<P> SetPermissionsFuture<P>
+where
+    P: AsRef<Path>
+{
+    fn new(path: P, perm: fs::Permissions) -> SetPermissionsFuture<P> {
+        SetPermissionsFuture {
+            path: path,
+            perm: perm,
+        }
+    }
+}
+
+impl<P> Future for SetPermissionsFuture<P>
+where
+    P: AsRef<Path>
+{
+    type Item = ();
+    type Error = io::Error;
+
+    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
+        ::blocking_io(|| fs::set_permissions(&self.path, self.perm.clone()) )
+    }
+}