Can cargo be used in pre-build?

[DefiCake]

For example:

[target.x86_64-unknown-linux-gnu]
pre-build = [
"cargo --help"
]

This fails with /bin/sh: 1: eval: cargo: not found

Which means we cannot install useful globals, frameworks and other things.

[Emilgardis]

No, cargo is not installed in the image. It is only mounted when actually running the image, and the mounted cargo is the cargo on your own filesystem

What is it that you want to install?

[DefiCake]

I see. I wanted to follow these installation instructions https://dev.risczero.com/api/zkvm/install

cargo install cargo-binstall
cargo binstall cargo-risczero
cargo risczero install

Is there any other stage or config where I could do this?

[NobodyXu]

FYI, cargo-binstall has a pre-built binary and you can actually use cargo-binstall without cargo:

curl -L --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/cargo-bins/cargo-binstall/main/install-from-binstall-release.sh | bash
cargo-binstall cargo-risczero

Many cargo-plugin tools can be used without cargo, by invoking the binary directly.

[Emilgardis]

Seems like its its own rust toolchain installed via rustup toolchain link, so as long as it runs on x86_64-unknown-linux-gnu you should be able to do cross +toolchain and follow the suggestions (you may have to set CROSS_CUSTOM_TOOLCHAIN=1). Ofc, if it installs other things outside of the toolchain folder it probably wouldn't work.

Basically, my earlier statement was a bit vague, the more correct statement is:

cross mounts the rust toolchain, as specified by the currently active toolchain channel (nightly, beta, stable) + the platform the image runs as. toolchain = cargo home and toolchain folders