091de12a9a
We actually want to delay fetching until we actually need the file. A simple evaluation asking for `.outPath` or `.drvPath` should work even in a pure offline environment. Before this CL, the fetching logic was quite distributed between tvix_store_io, and builtins/fetchers.rs. Rather than having various functions and conversions between structs, describe a Fetch as an enum type, with the fields describing the fetch. Define a store_path() function on top of `Fetch` which can be used to ask for the calculated store path (if the digest has been provided upfront). Have a `Fetcher` struct, and give it a `fetch_and_persist` function, taking a `Fetch` as well as a desired name, and have it deal with all the logic of persisting the PathInfos. It also returns a StorePathRef, similar to the `.store_path()` method on a `Fetch` struct. In a followup CL, we can extend KnownPaths to track fetches AND derivations, and then use `Fetcher` when we need to do IO into that store path. Change-Id: Ib39a96baeb661750a8706b461f8ba4abb342e777 Reviewed-on: https://cl.tvl.fyi/c/depot/+/11500 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Autosubmit: flokli <flokli@flokli.de> Tested-by: BuildkiteCI
24 lines
654 B
Rust
24 lines
654 B
Rust
pub mod builtins;
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pub mod fetchers;
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pub mod known_paths;
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pub mod refscan;
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pub mod tvix_build;
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pub mod tvix_io;
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pub mod tvix_store_io;
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mod decompression;
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#[cfg(test)]
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mod tests;
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/// Tell the Evaluator to resolve `<nix>` to the path `/__corepkgs__`,
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/// which has special handling in [tvix_io::TvixIO].
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/// This is used in nixpkgs to import `fetchurl.nix` from `<nix>`.
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pub fn configure_nix_path<IO>(
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eval: &mut tvix_eval::Evaluation<IO>,
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nix_search_path: &Option<String>,
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) {
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eval.nix_path = nix_search_path
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.as_ref()
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.map(|p| format!("nix=/__corepkgs__:{}", p))
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.or_else(|| Some("nix=/__corepkgs__".to_string()));
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}
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