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#include "drv-output-substitution-goal.hh"
#include "finally.hh"
#include "worker.hh"
#include "substitution-goal.hh"
#include "signals.hh"
namespace nix {
DrvOutputSubstitutionGoal::DrvOutputSubstitutionGoal(
const DrvOutput & id,
Worker & worker,
RepairFlag repair,
std::optional<ContentAddress> ca)
: Goal(worker, DerivedPath::Opaque { StorePath::dummy })
, id(id)
{
state = &DrvOutputSubstitutionGoal::init;
name = fmt("substitution of '%s'", id.to_string());
trace("created");
}
Goal::WorkResult DrvOutputSubstitutionGoal::init()
{
trace("init");
/* If the derivation already exists, we’re done */
if (worker.store.queryRealisation(id)) {
return Finished{ecSuccess};
}
subs = settings.useSubstitutes ? getDefaultSubstituters() : std::list<ref<Store>>();
return tryNext();
}
Goal::WorkResult DrvOutputSubstitutionGoal::tryNext()
{
trace("trying next substituter");
/* Make sure that we are allowed to start a substitution. Note that even
if maxSubstitutionJobs == 0, we still allow a substituter to run. This
prevents infinite waiting. */
if (worker.runningSubstitutions >= std::max(1U, settings.maxSubstitutionJobs.get())) {
return WaitForSlot{};
}
maintainRunningSubstitutions =
std::make_unique<MaintainCount<uint64_t>>(worker.runningSubstitutions);
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. */
return Finished{substituterFailed ? ecFailed : ecNoSubstituters};
}
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>();
downloadState->outPipe.create();
downloadState->result =
std::async(std::launch::async, [downloadState{downloadState}, id{id}, sub{sub}] {
ReceiveInterrupts receiveInterrupts;
Finally updateStats([&]() { downloadState->outPipe.writeSide.close(); });
return sub->queryRealisation(id);
});
worker.childStarted(shared_from_this(), {downloadState->outPipe.readSide.get()}, true, false);
state = &DrvOutputSubstitutionGoal::realisationFetched;
return StillAlive{};
}
Goal::WorkResult DrvOutputSubstitutionGoal::realisationFetched()
{
worker.childTerminated(this);
maintainRunningSubstitutions.reset();
try {
outputInfo = downloadState->result.get();
} catch (std::exception & e) {
printError(e.what());
substituterFailed = true;
}
if (!outputInfo) {
return tryNext();
}
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)
);
return tryNext();
}
addWaitee(worker.makeDrvOutputSubstitutionGoal(depId));
}
}
addWaitee(worker.makePathSubstitutionGoal(outputInfo->outPath));
if (waitees.empty()) {
return outPathValid();
} else {
state = &DrvOutputSubstitutionGoal::outPathValid;
return StillAlive{};
}
}
Goal::WorkResult DrvOutputSubstitutionGoal::outPathValid()
{
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
};
}
worker.store.registerDrvOutput(*outputInfo);
return finished();
}
Goal::WorkResult DrvOutputSubstitutionGoal::finished()
{
trace("finished");
return Finished{ecSuccess};
}
std::string DrvOutputSubstitutionGoal::key()
{
/* "a$" ensures substitution goals happen before derivation
goals. */
return "a$" + std::string(id.to_string());
}
Goal::WorkResult DrvOutputSubstitutionGoal::work()
{
return (this->*state)();
}
}
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