__WASI_ENOENT when renaming a file

[dicej]

Describe the bug

While working on konsoletyper/teavm#610, I noticed that renaming a file in a preopened directory doesn't seem to work in Wasmer. I originally noticed this when testing a Java program, but was able to reproduce it in Rust.

echo "`wasmer -V` | `rustc -V` | `uname -m`"

Wasmer complains that it doesn't understand the -V flag, but I'm using wasmer-cli built from commit 22c3736, which was master as of yesterday.

 | rustc 1.62.0 (a8314ef7d 2022-06-27) | x86_64

Steps to reproduce

1. Build the following Rust program using cargo build --target wasm32-wasi:

fn main() -> Result<(), Box<dyn std::error::Error>> {
    std::fs::rename("foo/bar.txt", "foo/um.txt")?;
    Ok(())
}

2. Create the directory and add the file to it:

mkdir foo
touch foo/bar.txt

3. Run the program:

wasmer --dir foo target/wasm32-wasi/debug/wasi-file-test.wasm

Expected behavior

The foo/bar.txt file would be renamed to foo/um.txt. This is the behavior when running the module using Wasmtime.

Actual behavior

Error: Os { code: 44, kind: NotFound, message: "No such file or directory" }

[syrusakbary]

Thanks for opening the issue @dicej! We'll take a look

[ptitSeb]

I reproduce the issue with current master. I'll check what's going on.