From 8deb3ed07cfa4ccebaf15c3aa2b6af949c6ed4ae Mon Sep 17 00:00:00 2001
From: Pat Hickey <pat@moreproductive.org>
Date: Fri, 18 Dec 2020 16:57:43 -0800
Subject: [PATCH] path_open: ENOTDIR when fd is a file

---
 crates/wasi-c2/src/snapshots/preview_1.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/crates/wasi-c2/src/snapshots/preview_1.rs b/crates/wasi-c2/src/snapshots/preview_1.rs
index 9a52f97785..d8d37b4fc8 100644
--- a/crates/wasi-c2/src/snapshots/preview_1.rs
+++ b/crates/wasi-c2/src/snapshots/preview_1.rs
@@ -663,7 +663,11 @@ impl<'a> wasi_snapshot_preview1::WasiSnapshotPreview1 for WasiCtx {
         fdflags: types::Fdflags,
     ) -> Result<types::Fd, Error> {
         let mut table = self.table();
-        let dir_entry: Ref<DirEntry> = table.get(u32::from(dirfd))?;
+        let dirfd = u32::from(dirfd);
+        if table.is::<FileEntry>(dirfd) {
+            return Err(Error::Notdir);
+        }
+        let dir_entry: Ref<DirEntry> = table.get(dirfd)?;
 
         let symlink_follow = dirflags.contains(&types::Lookupflags::SYMLINK_FOLLOW);