wasi-wit-download

Currently, there's lots of Wasm projects that require manual setup from the user. Part of that manual setup commonly involves downloading WIT files from a specific Wasmtime release. This project aims to automate that process by providing a CLI tool that can download WIT files for a specific Wasmtime release.

How to install?

cargo install wasi-wit-download

How to use?

wasi-wit-download <release> <wit-dep-1> <wit-dep-2> ... <wit-dep-n>

Example

wasi-wit-download 18 cli clocks

Output:

Downloading from Wasmtime version: 18
WIT dependencies to download: ["cli", "clocks"]
Downloaded: "cli"
Downloaded: "clocks"

This will download the WIT files for the cli and clocks dependencies from the Wasmtime release 18 to the current directory.

If you request a WIT dependency that doesn't exist, the tool will print an error message and exit.

$ wasi-wit-download 18 cli foo clocks
Downloading from Wasmtime version: 18
WIT dependencies to download: ["cli", "foo", "clocks"]
Downloaded: "cli"
Downloaded: "clocks"
Error: The following folders were not found in the archive: ["foo"]
error: process didn't exit successfully: `wasi-wit-download.exe 18 cli clocks foo` (exit code: 1)

Note: The WIT dependencies cli and clocks will still be downloaded.

Limitations

• This only works for Wasmtime versions 10 and above because we hardcode WIT deps search from wasmtime-{version}.0.0/crates/wasi/wit/deps which only exists in versions 10 onwards.
• There's no CI for testing. Only manual testing.
• We only allow downloading WIT files from major Wasmtime releases (e.g., 10, 11, 12, etc.). We don't support downloading WIT files from minor releases (e.g., 10.1, 10.2, 10.3, etc.).