wasi:filesystem@0.3.0-rc-2025-09-16: Add tests for rename

Author: wingo

tests/rust/wasm32-wasip3/src/bin/filesystem-rename.json

@@ -0,0 +1,3 @@
+{
+    "dirs": ["fs-tests.dir"]
+}

tests/rust/wasm32-wasip3/src/bin/filesystem-rename.rs

@@ -0,0 +1,112 @@
+use std::process;
+extern crate wit_bindgen;
+
+wit_bindgen::generate!({
+    inline: r"
+  package test:test;
+
+  world test {
+      include wasi:filesystem/imports@0.3.0-rc-2025-09-16;
+      include wasi:cli/command@0.3.0-rc-2025-09-16;
+  }
+",
+    additional_derives: [PartialEq, Eq, Hash, Clone],
+    // Work around https://github.com/bytecodealliance/wasm-tools/issues/2285.
+    features:["clocks-timezone"],
+    generate_all
+});
+
+use wasi::filesystem::types::{Descriptor, DescriptorFlags, ErrorCode, OpenFlags, PathFlags};
+
+async fn test_rename(dir: &Descriptor) {
+    // rename-at: async func(old-path: string, new-descriptor: borrow<descriptor>, new-path: string) -> result<_, error-code>;
+    dir.create_directory_at("child.cleanup".to_string())
+        .await
+        .unwrap();
+    let child = dir
+        .open_at(
+            PathFlags::empty(),
+            "child.cleanup".to_string(),
+            OpenFlags::DIRECTORY,
+            DescriptorFlags::MUTATE_DIRECTORY,
+        )
+        .await
+        .unwrap();
+    let mv = |from: &str, to: &str| -> _ { dir.rename_at(from.to_string(), dir, to.to_string()) };
+    let mv_to_child =
+        |from: &str, to: &str| -> _ { dir.rename_at(from.to_string(), &child, to.to_string()) };
+    let mv_from_child =
+        |from: &str, to: &str| -> _ { child.rename_at(from.to_string(), dir, to.to_string()) };
+    let ln_s = |from: &str, to: &str| -> _ { dir.symlink_at(from.to_string(), to.to_string()) };
+
+    mv("a.txt", "a.txt").await.unwrap();
+    ln_s("a.txt", "c.cleanup").await.unwrap();
+    mv("a.txt", "c.cleanup").await.unwrap();
+    assert_eq!(mv("a.txt", "a.txt").await, Err(ErrorCode::NoEntry));
+    mv("c.cleanup", "a.txt").await.unwrap();
+    assert_eq!(mv("c.cleanup", "a.txt").await, Err(ErrorCode::NoEntry));
+    assert_eq!(
+        mv("does-not-exist.txt", "q.txt").await,
+        Err(ErrorCode::NoEntry)
+    );
+    match mv(".", "q.txt").await {
+        Err(ErrorCode::Busy | ErrorCode::Invalid | ErrorCode::Access) => {}
+        Ok(()) => {
+            panic!("mv . q.txt unexpectedly succeeded");
+        }
+        Err(err) => {
+            panic!("mv . q.txt: unexpected error {}", err);
+        }
+    };
+    mv("a.txt", "c.cleanup").await.unwrap();
+    assert_eq!(mv("a.txt", "q.txt").await, Err(ErrorCode::NoEntry));
+    mv("c.cleanup", "a.txt").await.unwrap();
+    assert_eq!(mv("a.txt", "../q.txt").await, Err(ErrorCode::NotPermitted));
+    assert_eq!(
+        mv("a.txt", "parent/q.txt").await,
+        Err(ErrorCode::NotPermitted)
+    );
+    assert_eq!(
+        mv("a.txt", "/tmp/q.txt").await,
+        Err(ErrorCode::NotPermitted)
+    );
+
+    mv_to_child("a.txt", "whatever").await.unwrap();
+    assert_eq!(mv("a.txt", "whatever").await, Err(ErrorCode::NoEntry));
+    assert_eq!(mv("whatever", "whatever").await, Err(ErrorCode::NoEntry));
+    assert_eq!(
+        mv_to_child("a.txt", "whatever").await,
+        Err(ErrorCode::NoEntry)
+    );
+    mv_from_child("whatever", "a.txt").await.unwrap();
+    assert_eq!(
+        mv_from_child("whatever", "a.txt").await,
+        Err(ErrorCode::NoEntry)
+    );
+
+    drop(child);
+    dir.remove_directory_at("child.cleanup".to_string())
+        .await
+        .unwrap();
+}
+
+struct Component;
+export!(Component);
+impl exports::wasi::cli::run::Guest for Component {
+    async fn run() -> Result<(), ()> {
+        match &wasi::filesystem::preopens::get_directories()[..] {
+            [(dir, dirname)] if dirname == "fs-tests.dir" => {
+                test_rename(dir).await;
+            }
+            [..] => {
+                eprintln!("usage: run with one open dir named 'fs-tests.dir'");
+                process::exit(1)
+            }
+        };
+        Ok(())
+    }
+}
+
+fn main() {
+    unreachable!("main is a stub");
+}