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#include "drv-output-substitution-goal.hh"
#include "finally.hh"
#include "worker.hh"
#include "substitution-goal.hh"
#include "callback.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");
}
void DrvOutputSubstitutionGoal::init()
{
trace("init");
/* If the derivation already exists, we’re done */
if (worker.store.queryRealisation(id)) {
amDone(ecSuccess);
return;
}
subs = settings.useSubstitutes ? getDefaultSubstituters() : std::list<ref<Store>>();
tryNext();
}
void 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.runningCASubstitutions >= std::max(1U, settings.maxSubstitutionJobs.get())) {
worker.waitForBuildSlot(shared_from_this());
return;
}
maintainRunningSubstitutions =
std::make_unique<MaintainCount<uint64_t>>(worker.runningCASubstitutions);
worker.updateProgress();
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());
/* Hack: don't indicate failure if there were no substituters.
In that case the calling derivation should just do a
build. */
amDone(substituterFailed ? ecFailed : ecNoSubstituters);
if (substituterFailed) {
worker.failedSubstitutions++;
worker.updateProgress();
}
return;
}
sub = subs.front();
subs.pop_front();
// FIXME: Make async
// outputInfo = sub->queryRealisation(id);
/* The callback of the 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();
sub->queryRealisation(
id,
{ [downloadState(downloadState)](std::future<std::shared_ptr<const Realisation>> res) {
try {
Finally updateStats([&]() { downloadState->outPipe.writeSide.close(); });
downloadState->promise.set_value(res.get());
} catch (...) {
downloadState->promise.set_exception(std::current_exception());
}
} });
worker.childStarted(shared_from_this(), {downloadState->outPipe.readSide.get()}, true, false);
state = &DrvOutputSubstitutionGoal::realisationFetched;
}
void DrvOutputSubstitutionGoal::realisationFetched()
{
worker.childTerminated(this);
maintainRunningSubstitutions.reset();
try {
outputInfo = downloadState->promise.get_future().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)
);
tryNext();
return;
}
addWaitee(worker.makeDrvOutputSubstitutionGoal(depId));
}
}
addWaitee(worker.makePathSubstitutionGoal(outputInfo->outPath));
if (waitees.empty()) outPathValid();
else state = &DrvOutputSubstitutionGoal::outPathValid;
}
void 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());
amDone(nrNoSubstituters > 0 || nrIncompleteClosure > 0 ? ecIncompleteClosure : ecFailed);
return;
}
worker.store.registerDrvOutput(*outputInfo);
finished();
}
void DrvOutputSubstitutionGoal::finished()
{
trace("finished");
amDone(ecSuccess);
}
std::string DrvOutputSubstitutionGoal::key()
{
/* "a$" ensures substitution goals happen before derivation
goals. */
return "a$" + std::string(id.to_string());
}
void DrvOutputSubstitutionGoal::work()
{
(this->*state)();
}
void DrvOutputSubstitutionGoal::handleEOF(int fd)
{
if (fd == downloadState->outPipe.readSide.get()) worker.wakeUp(shared_from_this());
}
}
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