83291ff51e
This are leftovers from the "reference scanning" approach (which we didn't end up using). We still want a concept of known paths, so we can trace IO into storepaths back to the build recipe that'll produce it, so let's keep the rest of this struct around. Change-Id: I73d38e21e5b97950b8fc2a42176cae5f80d371c8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/10632 Autosubmit: flokli <flokli@flokli.de> Reviewed-by: raitobezarius <tvl@lahfa.xyz> Tested-by: BuildkiteCI
50 lines
1.6 KiB
Rust
50 lines
1.6 KiB
Rust
//! This module implements logic required for persisting known paths
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//! during an evaluation.
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//!
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//! Tvix needs to be able to keep track of each Nix store path that it
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//! knows about during the scope of a single evaluation and its
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//! related builds.
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//!
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//! This data is required to find the derivation needed to actually trigger the
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//! build, if necessary.
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use nix_compat::nixhash::NixHash;
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use std::collections::HashMap;
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#[derive(Debug, Default)]
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pub struct KnownPaths {
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/// All known derivation or FOD hashes.
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///
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/// Keys are derivation paths, values is the NixHash.
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derivation_or_fod_hashes: HashMap<String, NixHash>,
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}
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impl KnownPaths {
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/// Fetch the opaque "hash derivation modulo" for a given derivation path.
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pub fn get_hash_derivation_modulo(&self, drv_path: &str) -> NixHash {
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// TODO: we rely on an invariant that things *should* have
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// been calculated if we get this far.
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self.derivation_or_fod_hashes[drv_path].clone()
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}
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pub fn add_hash_derivation_modulo<D: ToString>(
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&mut self,
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drv: D,
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hash_derivation_modulo: &NixHash,
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) {
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#[allow(unused_variables)] // assertions on this only compiled in debug builds
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let old = self
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.derivation_or_fod_hashes
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.insert(drv.to_string(), hash_derivation_modulo.to_owned());
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#[cfg(debug_assertions)]
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{
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if let Some(old) = old {
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debug_assert!(
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old == *hash_derivation_modulo,
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"hash derivation modulo for a given derivation should always be calculated the same"
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);
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}
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}
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}
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}
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