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Move openEvalCache to libflake

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Most of the eval cache logic is flake-independent and libexpr,
but the loading part is not.
`nix-flake` is the right component for this, as the eval cache
isn't exactly specific to the command line.
This commit is contained in:
Robert Hensing 2025-10-09 20:40:40 +02:00
parent ce38b46e06
commit 0387b7d6db
4 changed files with 46 additions and 40 deletions
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36
src/libcmd/installables.cc
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@ -443,42 +443,6 @@ static StorePath getDeriver(ref<Store> store, const Installable & i, const Store
return *derivers.begin();
}
ref<eval_cache::EvalCache> openEvalCache(EvalState & state, std::shared_ptr<flake::LockedFlake> lockedFlake)
{
auto fingerprint = evalSettings.useEvalCache && evalSettings.pureEval
? lockedFlake->getFingerprint(state.store, state.fetchSettings)
: std::nullopt;
auto rootLoader = [&state, lockedFlake]() {
/* For testing whether the evaluation cache is
complete. */
if (getEnv("NIX_ALLOW_EVAL").value_or("1") == "0")
throw Error("not everything is cached, but evaluation is not allowed");
auto vFlake = state.allocValue();
flake::callFlake(state, *lockedFlake, *vFlake);
state.forceAttrs(*vFlake, noPos, "while parsing cached flake data");
auto aOutputs = vFlake->attrs()->get(state.symbols.create("outputs"));
assert(aOutputs);
return aOutputs->value;
};
if (fingerprint) {
auto search = state.evalCaches.find(fingerprint.value());
if (search == state.evalCaches.end()) {
search =
state.evalCaches
.emplace(fingerprint.value(), make_ref<nix::eval_cache::EvalCache>(fingerprint, state, rootLoader))
.first;
}
return search->second;
} else {
return make_ref<nix::eval_cache::EvalCache>(std::nullopt, state, rootLoader);
}
}
Installables SourceExprCommand::parseInstallables(ref<Store> store, std::vector<std::string> ss)
{
Installables result;