292 lines
9.0 KiB
C++
292 lines
9.0 KiB
C++
#include "derivations.hh"
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#include "parsed-derivations.hh"
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#include "globals.hh"
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#include "local-store.hh"
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#include "store-api.hh"
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#include "thread-pool.hh"
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namespace nix {
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void Store::computeFSClosure(const StorePathSet & startPaths,
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StorePathSet & paths_, bool flipDirection, bool includeOutputs, bool includeDerivers)
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{
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struct State
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{
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size_t pending;
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StorePathSet & paths;
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std::exception_ptr exc;
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};
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Sync<State> state_(State{0, paths_, 0});
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std::function<void(const Path &)> enqueue;
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std::condition_variable done;
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enqueue = [&](const Path & path) -> void {
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{
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auto state(state_.lock());
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if (state->exc) return;
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if (!state->paths.insert(parseStorePath(path)).second) return;
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state->pending++;
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}
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queryPathInfo(parseStorePath(path), {[&, pathS(path)](std::future<ref<const ValidPathInfo>> fut) {
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// FIXME: calls to isValidPath() should be async
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try {
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auto info = fut.get();
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auto path = parseStorePath(pathS);
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if (flipDirection) {
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StorePathSet referrers;
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queryReferrers(path, referrers);
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for (auto & ref : referrers)
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if (ref != path)
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enqueue(printStorePath(ref));
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if (includeOutputs)
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for (auto & i : queryValidDerivers(path))
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enqueue(printStorePath(i));
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if (includeDerivers && path.isDerivation())
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for (auto & i : queryDerivationOutputs(path))
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if (isValidPath(i) && queryPathInfo(i)->deriver == path)
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enqueue(printStorePath(i));
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} else {
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for (auto & ref : info->references)
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if (ref != path)
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enqueue(printStorePath(ref));
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if (includeOutputs && path.isDerivation())
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for (auto & i : queryDerivationOutputs(path))
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if (isValidPath(i)) enqueue(printStorePath(i));
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if (includeDerivers && info->deriver && isValidPath(*info->deriver))
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enqueue(printStorePath(*info->deriver));
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}
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{
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auto state(state_.lock());
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assert(state->pending);
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if (!--state->pending) done.notify_one();
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}
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} catch (...) {
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auto state(state_.lock());
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if (!state->exc) state->exc = std::current_exception();
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assert(state->pending);
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if (!--state->pending) done.notify_one();
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};
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}});
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};
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for (auto & startPath : startPaths)
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enqueue(printStorePath(startPath));
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{
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auto state(state_.lock());
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while (state->pending) state.wait(done);
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if (state->exc) std::rethrow_exception(state->exc);
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}
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}
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void Store::computeFSClosure(const StorePath & startPath,
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StorePathSet & paths_, bool flipDirection, bool includeOutputs, bool includeDerivers)
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{
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StorePathSet paths;
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paths.insert(startPath.clone());
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computeFSClosure(paths, paths_, flipDirection, includeOutputs, includeDerivers);
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}
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void Store::queryMissing(const std::vector<StorePathWithOutputs> & targets,
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StorePathSet & willBuild_, StorePathSet & willSubstitute_, StorePathSet & unknown_,
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unsigned long long & downloadSize_, unsigned long long & narSize_)
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{
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Activity act(*logger, lvlDebug, actUnknown, "querying info about missing paths");
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downloadSize_ = narSize_ = 0;
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ThreadPool pool;
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struct State
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{
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std::unordered_set<std::string> done;
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StorePathSet & unknown, & willSubstitute, & willBuild;
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unsigned long long & downloadSize;
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unsigned long long & narSize;
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};
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struct DrvState
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{
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size_t left;
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bool done = false;
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StorePathSet outPaths;
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DrvState(size_t left) : left(left) { }
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};
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Sync<State> state_(State{{}, unknown_, willSubstitute_, willBuild_, downloadSize_, narSize_});
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std::function<void(StorePathWithOutputs)> doPath;
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auto mustBuildDrv = [&](const StorePath & drvPath, const Derivation & drv) {
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{
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auto state(state_.lock());
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state->willBuild.insert(drvPath.clone());
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}
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for (auto & i : drv.inputDrvs)
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pool.enqueue(std::bind(doPath, StorePathWithOutputs(i.first, i.second)));
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};
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auto checkOutput = [&](
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const Path & drvPathS, ref<Derivation> drv, const Path & outPathS, ref<Sync<DrvState>> drvState_)
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{
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if (drvState_->lock()->done) return;
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auto drvPath = parseStorePath(drvPathS);
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auto outPath = parseStorePath(outPathS);
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SubstitutablePathInfos infos;
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StorePathSet paths; // FIXME
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paths.insert(outPath.clone());
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querySubstitutablePathInfos(paths, infos);
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if (infos.empty()) {
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drvState_->lock()->done = true;
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mustBuildDrv(drvPath, *drv);
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} else {
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{
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auto drvState(drvState_->lock());
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if (drvState->done) return;
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assert(drvState->left);
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drvState->left--;
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drvState->outPaths.insert(outPath.clone());
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if (!drvState->left) {
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for (auto & path : drvState->outPaths)
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pool.enqueue(std::bind(doPath, StorePathWithOutputs(path.clone())));
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}
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}
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}
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};
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doPath = [&](const StorePathWithOutputs & path) {
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{
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auto state(state_.lock());
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if (!state->done.insert(path.to_string(*this)).second) return;
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}
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if (path.path.isDerivation()) {
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if (!isValidPath(path.path)) {
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// FIXME: we could try to substitute the derivation.
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auto state(state_.lock());
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state->unknown.insert(path.path.clone());
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return;
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}
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auto drv = make_ref<Derivation>(derivationFromPath(path.path));
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ParsedDerivation parsedDrv(path.path.clone(), *drv);
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PathSet invalid;
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for (auto & j : drv->outputs)
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if (wantOutput(j.first, path.outputs)
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&& !isValidPath(j.second.path))
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invalid.insert(printStorePath(j.second.path));
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if (invalid.empty()) return;
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if (settings.useSubstitutes && parsedDrv.substitutesAllowed()) {
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auto drvState = make_ref<Sync<DrvState>>(DrvState(invalid.size()));
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for (auto & output : invalid)
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pool.enqueue(std::bind(checkOutput, printStorePath(path.path), drv, output, drvState));
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} else
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mustBuildDrv(path.path, *drv);
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} else {
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if (isValidPath(path.path)) return;
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SubstitutablePathInfos infos;
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StorePathSet paths; // FIXME
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paths.insert(path.path.clone());
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querySubstitutablePathInfos(paths, infos);
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if (infos.empty()) {
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auto state(state_.lock());
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state->unknown.insert(path.path.clone());
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return;
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}
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auto info = infos.find(path.path);
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assert(info != infos.end());
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{
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auto state(state_.lock());
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state->willSubstitute.insert(path.path.clone());
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state->downloadSize += info->second.downloadSize;
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state->narSize += info->second.narSize;
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}
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for (auto & ref : info->second.references)
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pool.enqueue(std::bind(doPath, StorePathWithOutputs(ref)));
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}
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};
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for (auto & path : targets)
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pool.enqueue(std::bind(doPath, path));
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pool.process();
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}
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StorePaths Store::topoSortPaths(const StorePathSet & paths)
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{
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StorePaths sorted;
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StorePathSet visited, parents;
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std::function<void(const StorePath & path, const StorePath * parent)> dfsVisit;
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dfsVisit = [&](const StorePath & path, const StorePath * parent) {
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if (parents.count(path))
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throw BuildError("cycle detected in the references of '%s' from '%s'",
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printStorePath(path), printStorePath(*parent));
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if (!visited.insert(path.clone()).second) return;
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parents.insert(path.clone());
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StorePathSet references;
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try {
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references = cloneStorePathSet(queryPathInfo(path)->references);
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} catch (InvalidPath &) {
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}
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for (auto & i : references)
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/* Don't traverse into paths that don't exist. That can
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happen due to substitutes for non-existent paths. */
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if (i != path && paths.count(i))
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dfsVisit(i, &path);
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sorted.push_back(path.clone());
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parents.erase(path);
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};
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for (auto & i : paths)
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dfsVisit(i, nullptr);
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std::reverse(sorted.begin(), sorted.end());
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return sorted;
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}
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}
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