Failed to copy wasm binary using target wasm32-wasip1 when using Rust 1.81

[GeeWee]

Version

Fastly CLI version v10.14.1 (b3926881)
Built with go version go1.22.7 linux/amd64 (2024-09-17)
Viceroy version: viceroy 0.12.0

What happened

Rust has recently renamed it's wasi target from wasm32-wasi to wasm32-wasip1.

Using the old name is starting to generate warnings in Rust 1.81.

I am unable to upgrade the target, as I get the following error:

ERROR: failed to copy wasm binary: cannot read source file: /Users/gustavwengel/programming/edge-api/target/wasm32-wasi/release/edge-api.wasm.

which makes sense, as the binary is now in target/wasm32-wasip1/...

Full command output:

$ fastly compute build --verbose
Fastly API endpoint: https://api.fastly.com

✓ Verifying fastly.toml

INFO: Failed to lookup wasm-tools binary in user $PATH. We'll attempt to locate it inside a Fastly CLI
managed directory.

INFO: wasm-tools is installed but the CLI config (`fastly config`) shows the TTL, checking for a newer
version, hasn't expired.

✓ Identifying package name
✓ Identifying toolchain

INFO: Creating ./bin directory (for Wasm binary)

Command output for 'cargo locate-project --quiet': {"root":"/Users/gustavwengel/programming/edge-api/edge-api/Cargo.toml"}

INFO: The Fastly CLI requires a Rust version '>= 1.56.1'.

Build script to execute:
	sh -c cargo build --bin edge-api --release --target wasm32-wasip1 --color always

INFO: Command output:
--------------------------------------------------------------------------------
    Finished `release` profile [optimized] target(s) in 0.40s
--------------------------------------------------------------------------------

✓ Running [scripts.build]

ERROR: failed to copy wasm binary: cannot read source file: /Users/gustavwengel/programming/edge-api/target/wasm32-wasi/release/edge-api.wasm.

Here are some steps you can follow to debug the issue:

- Re-run the fastly command with the --verbose flag to see more information.
- Is the required language toolchain (node/npm, rust/cargo etc) installed correctly?
- Is the required version (if any) of the language toolchain installed/activated?
- Were the required dependencies (package.json, Cargo.toml etc) installed?
- Did the build script (see fastly.toml [scripts.build]) produce a ./bin/main.wasm binary file?
- Was there a configured [scripts.post_build] step that needs to be double-checked?

[kpfleming]

Indeed, we're aware of this name change but haven't had time to review all of the places throughout the build process which will need to be updated. Thanks for reporting it!

[GeeWee]

My pleasure! Would be wonderful to get some sort of timeline, as we generally have an environment where we can't build/deploy anything that generates warnings, which means we can't update our Rust version currently as there doesn't seem to be any way to silence the target rename warning.

[kpfleming]

That's understandable; we don't have a timeline to provide right now, but realistically it will be a couple of months before we've identified all of the places in our Compute workflows that are affected by the platform name and are ready for customers to begin using wasm32-wasip1.

[GeeWee]

Okay, good to know! Thanks!

[TerrariumCode]

Hello 👋 Are there any updates on this? We've had to pin to the last stable toolchain with this target for a little while now

[GeeWee]

Haven't heard anything from Fastly, but what we did to target the new target was to change the build script like this - essentilaly building the new target and then moving to the old directory where fastly expects things to reside. Haven't tried it with a rust version where the old target is deprecated yet, but should work.

build = """
cargo build --bin YOUR_APPLICATION --target wasm32-wasip1 --color always &&
TARGET_DIR=$(cargo metadata --format-version=1 | python3 -c "import sys, json; print(json.load(sys.stdin)['target_directory'])") &&
mkdir -p ${TARGET_DIR}/wasm32-wasi/release &&
command cp -f ${TARGET_DIR}/wasm32-wasip1/debug/YOUR_APPLICATION.wasm ${TARGET_DIR}/wasm32-wasi/release/YOUR_APPLICATION.wasm
"""