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Optimize usage under rustup. #11917

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merged 6 commits into from
May 5, 2023
Merged

Optimize usage under rustup. #11917

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52317aa
Add some tests for simulating behavior under rustup.
ehuss Mar 10, 2023
d4b0b49
Add an optimization when running under rustup.
ehuss Mar 11, 2023
cdf60e3
Add an assert to confirm that this function is only used with proxies.
ehuss Apr 8, 2023
42ef94f
Check for toolchains names with slashes and use the slow path in that…
ehuss Apr 8, 2023
4f79ac3
Change `get_tool` to use an enum to constrain which values it accepts.
ehuss May 3, 2023
b9993bd
Switch to then_some.
ehuss May 3, 2023
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Check for toolchains names with slashes and use the slow path in that… 
… case.
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@ehuss
ehuss committed May 3, 2023
commit 42ef94f38405cf1c4301bdac1d9291eda691c82f
5 changes: 5 additions & 0 deletions src/cargo/util/config/mod.rs
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Expand Up @@ -1664,6 1664,11 @@ impl Config {
//
// First, we must be running under rustup in the first place.
let toolchain = self.get_env_os("RUSTUP_TOOLCHAIN")?;
// This currently does not support toolchain paths.
// This also enforces UTF-8.
if toolchain.to_str()?.contains(&['/', '\\']) {
return None;
}
// If the tool on PATH is the same as `rustup` on path, then
// there is pretty good evidence that it will be a proxy.
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@rbtcollins rbtcollins Apr 1, 2023 •
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We have an exact list of the proxies we offer btw. I think it is a good idea to only take the fastpath for things we are known to proxy. I'm happy to commit to keeping a copy of that list in Cargo up to date. New proxies are very rare.

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Cargo is currently hard-coded to only use this for rustc and rustdoc. I added an assert to validate that requirement, and I think we can extend it in the future if needed. I don't think we quite yet need to have an exhaustive list for all the proxies (just to keep things simple for now).

let tool_resolved = paths::resolve_executable(Path::new(tool)).ok()?;
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