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#include "drv-output-substitution-goal.hh"
#include "build-result.hh"
#include "finally.hh"
#include "worker.hh"
#include "substitution-goal.hh"
#include "signals.hh"
#include <kj/array.h>
#include <kj/async.h>
#include <kj/vector.h>
namespace nix {
DrvOutputSubstitutionGoal::DrvOutputSubstitutionGoal(
const DrvOutput & id,
Worker & worker,
bool isDependency,
RepairFlag repair,
std::optional<ContentAddress> ca)
: Goal(worker, isDependency)
, id(id)
{
name = fmt("substitution of '%s'", id.to_string());
trace("created");
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::work() noexcept
try {
trace("init");
/* If the derivation already exists, we’re done */
if (worker.store.queryRealisation(id)) {
co_return Finished{ecSuccess, std::move(buildResult)};
}
subs = settings.useSubstitutes ? getDefaultSubstituters() : std::list<ref<Store>>();
co_return co_await tryNext();
} catch (...) {
co_return result::failure(std::current_exception());
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::tryNext() noexcept
try {
trace("trying next substituter");
if (!slotToken.valid()) {
slotToken = co_await worker.substitutions.acquire();
}
maintainRunningSubstitutions = worker.runningSubstitutions.addTemporarily(1);
if (subs.size() == 0) {
/* None left. Terminate this goal and let someone else deal
with it. */
debug("derivation output '%s' is required, but there is no substituter that can provide it", id.to_string());
if (substituterFailed) {
worker.failedSubstitutions++;
}
/* Hack: don't indicate failure if there were no substituters.
In that case the calling derivation should just do a
build. */
co_return Finished{substituterFailed ? ecFailed : ecNoSubstituters, std::move(buildResult)};
}
sub = subs.front();
subs.pop_front();
/* The async call to a curl download below can outlive `this` (if
some other error occurs), so it must not touch `this`. So put
the shared state in a separate refcounted object. */
downloadState = std::make_shared<DownloadState>();
auto pipe = kj::newPromiseAndCrossThreadFulfiller<void>();
downloadState->outPipe = kj::mv(pipe.fulfiller);
downloadState->result =
std::async(std::launch::async, [downloadState{downloadState}, id{id}, sub{sub}] {
Finally updateStats([&]() { downloadState->outPipe->fulfill(); });
ReceiveInterrupts receiveInterrupts;
return sub->queryRealisation(id);
});
co_await pipe.promise;
co_return co_await realisationFetched();
} catch (...) {
co_return result::failure(std::current_exception());
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::realisationFetched() noexcept
try {
maintainRunningSubstitutions.reset();
slotToken = {};
try {
outputInfo = downloadState->result.get();
} catch (std::exception & e) {
printError(e.what());
substituterFailed = true;
}
if (!outputInfo) {
co_return co_await tryNext();
}
kj::Vector<std::pair<GoalPtr, kj::Promise<void>>> dependencies;
for (const auto & [depId, depPath] : outputInfo->dependentRealisations) {
if (depId != id) {
if (auto localOutputInfo = worker.store.queryRealisation(depId);
localOutputInfo && localOutputInfo->outPath != depPath) {
warn(
"substituter '%s' has an incompatible realisation for '%s', ignoring.\n"
"Local: %s\n"
"Remote: %s",
sub->getUri(),
depId.to_string(),
worker.store.printStorePath(localOutputInfo->outPath),
worker.store.printStorePath(depPath)
);
co_return co_await tryNext();
}
dependencies.add(worker.goalFactory().makeDrvOutputSubstitutionGoal(depId));
}
}
dependencies.add(worker.goalFactory().makePathSubstitutionGoal(outputInfo->outPath));
if (!dependencies.empty()) {
(co_await waitForGoals(dependencies.releaseAsArray())).value();
}
co_return co_await outPathValid();
} catch (...) {
co_return result::failure(std::current_exception());
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::outPathValid() noexcept
try {
assert(outputInfo);
trace("output path substituted");
if (nrFailed > 0) {
debug("The output path of the derivation output '%s' could not be substituted", id.to_string());
return {Finished{
nrNoSubstituters > 0 || nrIncompleteClosure > 0 ? ecIncompleteClosure : ecFailed,
std::move(buildResult),
}};
}
worker.store.registerDrvOutput(*outputInfo);
return finished();
} catch (...) {
return {std::current_exception()};
}
kj::Promise<Result<Goal::WorkResult>> DrvOutputSubstitutionGoal::finished() noexcept
try {
trace("finished");
return {Finished{ecSuccess, std::move(buildResult)}};
} catch (...) {
return {std::current_exception()};
}
}
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