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Add Store::buildPathsWithResults()

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This function is like buildPaths(), except that it returns a vector of
BuildResults containing the exact statuses and output paths of each
derivation / substitution. This is convenient for functions like
Installable::build(), because they then don't need to do another
series of calls to get the outputs of CA derivations. It's also a
precondition to impure derivations, where we *can't* query the output
of those derivations since they're not stored in the Nix database.

Note that PathSubstitutionGoal can now also return a BuildStatus.
This commit is contained in:
Eelco Dolstra 2022-03-08 19:50:46 +01:00
parent 92b8d4d886
commit a4604f1928
16 changed files with 411 additions and 186 deletions
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33
src/libcmd/installables.cc
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@ -12,6 +12,7 @@
#include "eval-cache.hh"
#include "url.hh"
#include "registry.hh"
#include "build-result.hh"
#include <regex>
#include <queue>
@ -769,8 +770,7 @@ BuiltPaths getBuiltPaths(ref<Store> evalStore, ref<Store> store, const DerivedPa
throw Error(
"the derivation '%s' doesn't have an output named '%s'",
store->printStorePath(bfd.drvPath), output);
if (settings.isExperimentalFeatureEnabled(
Xp::CaDerivations)) {
if (settings.isExperimentalFeatureEnabled(Xp::CaDerivations)) {
auto outputId =
DrvOutput{outputHashes.at(output), output};
auto realisation =
@ -816,12 +816,31 @@ BuiltPaths Installable::build(
pathsToBuild.insert(pathsToBuild.end(), b.begin(), b.end());
}
if (mode == Realise::Nothing || mode == Realise::Derivation)
switch (mode) {
case Realise::Nothing:
case Realise::Derivation:
printMissing(store, pathsToBuild, lvlError);
else if (mode == Realise::Outputs)
store->buildPaths(pathsToBuild, bMode, evalStore);
return getBuiltPaths(evalStore, store, pathsToBuild);
return getBuiltPaths(evalStore, store, pathsToBuild);
case Realise::Outputs: {
BuiltPaths res;
for (auto & buildResult : store->buildPathsWithResults(pathsToBuild, bMode, evalStore)) {
if (!buildResult.success())
buildResult.rethrow();
if (buildResult.drvPath) {
std::map<std::string, StorePath> outputs;
for (auto & path : buildResult.builtOutputs)
outputs.emplace(path.first.outputName, path.second.outPath);
res.push_back(BuiltPath::Built{*buildResult.drvPath, outputs});
} else if (buildResult.outPath) {
res.push_back(BuiltPath::Opaque{*buildResult.outPath});
} else
abort();
}
return res;
}
default:
assert(false);
}
}
BuiltPaths Installable::toBuiltPaths(