Follow-up from T256827: Support Rust repositories in CI
The crates.io metadata and package archives probably can be cached in castor, but we should use something like sccache (see T260414) for build caching.
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We save the whole content of /cache which is defined in the XDG_CACHE_HOME environment variable. Is cargo recognizes it, the packages metadata and archives are already saved.
For the build caching, if it is fast enough I guess do not bother with a shared build cache. It might well end up being a nightmare to set it right or get polluted by the arbitrary code we run.
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It doesn't :( https://github.com/rust-lang/cargo/issues/1734
Caches are saved in cargo's "home": https://doc.rust-lang.org/cargo/guide/cargo-home.html - I think setting CARGO_HOME=/cache should work.
For the build caching, if it is fast enough I guess do not bother with a shared build cache. It might well end up being a nightmare to set it right or get polluted by the arbitrary code we run.
I think it's definitely a nice to have, especially as we get more rust projects (hopefully :)). I've been doing some testing of sccache in Cloud VPS and locally and it's been pretty great so far.