From a4372c8c2e8192b1ff752ee6c7b5b0d47986962b Mon Sep 17 00:00:00 2001
From: Pat Hickey <pat@moreproductive.org>
Date: Mon, 1 Feb 2021 13:15:39 -0800
Subject: [PATCH] cap-std-sync: test opening a tempdir as ambient and then
 WasiDir

---
 Cargo.lock                                 |  1 +
 crates/wasi-common/cap-std-sync/Cargo.toml |  3 +++
 crates/wasi-common/cap-std-sync/src/dir.rs | 19 ++++++++++++++++++-
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/Cargo.lock b/Cargo.lock
index 93e3572b5a..e2b792cf94 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3075,6 +3075,7 @@ dependencies = [
  "lazy_static",
  "libc",
  "system-interface",
+ "tempfile",
  "tracing",
  "unsafe-io",
  "wasi-common",
diff --git a/crates/wasi-common/cap-std-sync/Cargo.toml b/crates/wasi-common/cap-std-sync/Cargo.toml
index 17320baf17..534b6dee67 100644
--- a/crates/wasi-common/cap-std-sync/Cargo.toml
+++ b/crates/wasi-common/cap-std-sync/Cargo.toml
@@ -31,3 +31,6 @@ libc = "0.2"
 [target.'cfg(windows)'.dependencies]
 winapi = "0.3"
 lazy_static = "1.4"
+
+[dev-dependencies]
+tempfile = "3.1.0"
diff --git a/crates/wasi-common/cap-std-sync/src/dir.rs b/crates/wasi-common/cap-std-sync/src/dir.rs
index 1c75173c70..3ba290d508 100644
--- a/crates/wasi-common/cap-std-sync/src/dir.rs
+++ b/crates/wasi-common/cap-std-sync/src/dir.rs
@@ -1,4 +1,4 @@
-use crate::file::{filetype_from, to_sysif_fdflags, File};
+use crate::file::{filetype_from, File};
 use cap_fs_ext::{DirExt, MetadataExt, SystemTimeSpec};
 use std::any::Any;
 use std::convert::TryInto;
@@ -256,3 +256,20 @@ fn convert_systimespec(t: Option<wasi_common::SystemTimeSpec>) -> Option<SystemT
         None => None,
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::Dir;
+    #[test]
+    fn scratch_dir() {
+        let tempdir = tempfile::Builder::new()
+            .prefix("cap-std-sync")
+            .tempdir()
+            .expect("create temporary dir");
+        let preopen_dir = unsafe { cap_std::fs::Dir::open_ambient_dir(tempdir.path()) }
+            .expect("open ambient temporary dir");
+        let preopen_dir = Dir::from_cap_std(preopen_dir);
+        wasi_common::WasiDir::open_dir(&preopen_dir, false, ".")
+            .expect("open the same directory via WasiDir abstraction");
+    }
+}