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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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42
src/libflake/flake.cc
View file

@ -1,6 +1,9 @@
#include "nix/util/terminal.hh"
#include "nix/util/ref.hh"
#include "nix/util/environment-variables.hh"
#include "nix/flake/flake.hh"
#include "nix/expr/eval.hh"
#include "nix/expr/eval-cache.hh"
#include "nix/expr/eval-settings.hh"
#include "nix/flake/lockfile.hh"
#include "nix/expr/primops.hh"
@ -924,8 +927,6 @@ void callFlake(EvalState & state, const LockedFlake & lockedFlake, Value & vRes)
state.callFunction(*vCallFlake, args, vRes, noPos);
}
} // namespace flake
std::optional<Fingerprint> LockedFlake::getFingerprint(ref<Store> store, const fetchers::Settings & fetchSettings) const
{
if (lockFile.isUnlocked(fetchSettings))
@ -953,4 +954,41 @@ std::optional<Fingerprint> LockedFlake::getFingerprint(ref<Store> store, const f
Flake::~Flake() {}
ref<eval_cache::EvalCache> openEvalCache(EvalState & state, std::shared_ptr<LockedFlake> lockedFlake)
{
auto fingerprint = state.settings.useEvalCache && state.settings.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();
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<eval_cache::EvalCache>(fingerprint, state, rootLoader))
.first;
}
return search->second;
} else {
return make_ref<eval_cache::EvalCache>(std::nullopt, state, rootLoader);
}
}
} // namespace flake
} // namespace nix