Make ErrorKind::PathNotFound consistent on inotify

Before this patch, watching a nonexistent path using inotify backend
would give an `ErrorKind::Io` variant. This behavior was inconsistent
with other backends.

Signed-off-by: y5c4l3 <y5c4l3@proton.me>

notify/src/error.rs

@@ -81,6 +81,15 @@ impl Error {
  Self::new(ErrorKind::Io(err))
  }
 
+ /// Similar to [`Error::io`], but specifically handles [`io::ErrorKind::NotFound`].
+ pub fn io_watch(err: io::Error) -> Self {
+ if err.kind() == io::ErrorKind::NotFound {
+ Self::path_not_found()
+ } else {
+ Self::io(err)
+ }
+ }
+
  /// Creates a new "path not found" error.
  pub fn path_not_found() -> Self {
  Self::new(ErrorKind::PathNotFound)

notify/src/inotify.rs

@@ -393,7 +393,7 @@ impl EventLoop {
  fn add_watch(&mut self, path: PathBuf, is_recursive: bool, mut watch_self: bool) -> Result<()> {
  // If the watch is not recursive, or if we determine (by stat'ing the path to get its
  // metadata) that the watched path is not a directory, add a single path watch.
- if !is_recursive || !metadata(&path).map_err(Error::io)?.is_dir() {
+ if !is_recursive || !metadata(&path).map_err(Error::io_watch)?.is_dir() {
  return self.add_single_watch(path, false, true);
  }