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First attempt at caching the evaluation in nix build

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This commit is contained in:
regnat 2021-06-04 11:39:29 +02:00
parent ffec547ebc
commit 3e261410bc
1 changed files with 34 additions and 17 deletions
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51
src/libcmd/installables.cc
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@ -498,25 +498,42 @@ std::tuple<std::string, FlakeRef, InstallableValue::DerivationInfo> InstallableF
auto root = cache->getRoot();
for (auto & attrPath : getActualAttrPaths()) {
auto attr = root->findAlongAttrPath(
parseAttrPath(*state, attrPath),
true
);
auto emptyArgs = state->allocBindings(0);
auto drvPathAttrPath = attrPath + ".drvPath";
auto drvOutputNameAttrPath = attrPath + ".outputName";
auto drvOutputPathAttrPath = attrPath + ".outPath";
try {
auto [drvPathValue, pos] = findAlongAttrPath(
*state,
drvPathAttrPath,
*emptyArgs,
*getFlakeOutputs(*state, *lockedFlake)
);
auto drvPath = state->forceString(*drvPathValue);
auto drvOutputNameValue = findAlongAttrPath(
*state,
drvOutputNameAttrPath,
*emptyArgs,
*getFlakeOutputs(*state, *lockedFlake)
).first;
auto drvOutputName = state->forceString(*drvOutputNameValue);
auto drvOutputPathValue = findAlongAttrPath(
*state,
drvOutputPathAttrPath,
*emptyArgs,
*getFlakeOutputs(*state, *lockedFlake)
).first;
auto drvOutputPath = state->forceString(*drvOutputPathValue);
if (!attr) continue;
auto drvInfo = DerivationInfo{
state->store->parseStorePath(drvPath),
state->store->maybeParseStorePath(drvOutputPath), // FIXME: set to something when relevant?
drvOutputName
};
if (!attr->isDerivation())
throw Error("flake output attribute '%s' is not a derivation", attrPath);
auto drvPath = attr->forceDerivation();
auto drvInfo = DerivationInfo{
std::move(drvPath),
state->store->maybeParseStorePath(attr->getAttr(state->sOutPath)->getString()),
attr->getAttr(state->sOutputName)->getString()
};
return {attrPath, lockedFlake->flake.lockedRef, std::move(drvInfo)};
return {attrPath, lockedFlake->flake.lockedRef, std::move(drvInfo)};
} catch (AttrPathNotFound & e) {
}
}
throw Error("flake '%s' does not provide attribute %s",