Unable to run wasmtime component (Error: No such file or directory (os error 2))

[tpmccallum]

I am compiling using the following command:

$ cargo component build --target wasm32-wasip2
  Generating bindings for compress (src/bindings.rs)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s

But when I use wasmtime I get an error:

$ wasmtime component run --env PATH=$PATH --dir . --invoke compress target/wasm32-wasip2/debug/compress.wasm
Error: No such file or directory (os error 2)

I put the source code and config in a repo so you can see everything. Super stumped on this one, would appreciate some assistance.

https://github.com/tpmccallum/testing_components/blob/main/README.md

[tpmccallum]

Here are some details of my system/setup that might help with the diagnosis:

$ rustc --version
rustc 1.87.0-nightly (f8a913b13 2025-02-23)

$ cargo component --version
cargo-component-component 0.20.0

$ wasmtime --version
wasmtime 30.0.1

$ uname -a
Darwin Kernel Version 24.3.0: X86_64

The target/wasm32-wasip2 file exists.
I tried updating cargo-component, forcing wasip2 in config but output in the CLI still says wasip1.
Is wasmtime 30.0.1 mishandling wasip2 components?
The auto-generated bindings.rs mention wit-bindgen:0.36.0 and I am not sure if the bindings being generated are correct.
wit-bindgen:0.36.0

[bjorn3]

Does the target/wasm32-wasip2/debug/compress.wasm file exist?

[tpmccallum]

Yes, the target/wasm32-wasip2/debug/compress.wasm does exist.

[alexcrichton]

Thanks for the report! (and 👋)

I think the problem here is that wasmtime component run isn't a subcommand of the wasmtime executable. Coupled with Wasmtime's bad error message (which is improved at #10292 now) I think that led to the confusion here.

When removing component I then get:

$ wasmtime run --env PATH=$PATH --dir . --invoke compress target/wasm32-wasip2/debug/compress.wasm
Error: failed to run main module `target/wasm32-wasip2/debug/compress.wasm`

Caused by:
    using `--invoke` with components is not supported

which is expected in that --invoke isn't supported for components just yet.

[pchickey]

expected in that --invoke isn't supported for components just yet.

Its not that far off but I haven't had the time or energy to get it over the finish line. If someone else wants to pick it up, ping me on the PR or zulip #10054

[tpmccallum]

Thanks for the reply @bjorn3, @pchickey.
Thanks, @alexcrichton (and 👋 back).

This is super helpful and appreciated.

wasip1/wasip2
Some of the confusion (not wasmtime related specifically) was because I thought the cargo component command supported wasip2. I have since learned that it does not. Based on the output I was getting when generating the bindings I thought that something was off with my config or toolchain and I chased my own tail for quite a while.

Error: No such file or directory (os error 2)
Thanks for the improved error message, that makes sense now.

Invoke Functionality
I went ahead and fetched @pchickey's PR to test the --invoke out locally. Here's the results:

cd /Users/tpmccallum
git clone https://github.com/bytecodealliance/wasmtime.git
cd wasmtime
git checkout main
git pull origin main
git checkout pch/invoke_wave
git merge main
cargo clean
cargo build --release

I then tried to run the component and got the following result (hopefully useful feedback for the continuation of the work on #10054):

tpmccallum@192-168-1-17 compress % /Users/tpmccallum/wasmtime/target/release/wasmtime run --invoke compress target/wasm32-wasip1/debug/compress.wasm

Error: failed to run main module `target/wasm32-wasip1/debug/compress.wasm`

Caused by:
    0: parsing invoke "compress"
    1: unexpected end of input at 8..8