diff options
Diffstat (limited to 'third_party/nix/src/libstore/remote-store.cc')
| -rw-r--r-- | third_party/nix/src/libstore/remote-store.cc | 817 |
1 files changed, 817 insertions, 0 deletions
diff --git a/third_party/nix/src/libstore/remote-store.cc b/third_party/nix/src/libstore/remote-store.cc new file mode 100644 index 000000000000..f34369d8fe0a --- /dev/null +++ b/third_party/nix/src/libstore/remote-store.cc @@ -0,0 +1,817 @@ +#include "serialise.hh" +#include "util.hh" +#include "remote-store.hh" +#include "worker-protocol.hh" +#include "archive.hh" +#include "affinity.hh" +#include "globals.hh" +#include "derivations.hh" +#include "pool.hh" +#include "finally.hh" + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <errno.h> +#include <fcntl.h> +#include <unistd.h> + +#include <cstring> + +namespace nix { + + +Path readStorePath(Store & store, Source & from) +{ + Path path = readString(from); + store.assertStorePath(path); + return path; +} + + +template<class T> T readStorePaths(Store & store, Source & from) +{ + T paths = readStrings<T>(from); + for (auto & i : paths) store.assertStorePath(i); + return paths; +} + +template PathSet readStorePaths(Store & store, Source & from); +template Paths readStorePaths(Store & store, Source & from); + +/* TODO: Separate these store impls into different files, give them better names */ +RemoteStore::RemoteStore(const Params & params) + : Store(params) + , connections(make_ref<Pool<Connection>>( + std::max(1, (int) maxConnections), + [this]() { return openConnectionWrapper(); }, + [this](const ref<Connection> & r) { + return + r->to.good() + && r->from.good() + && std::chrono::duration_cast<std::chrono::seconds>( + std::chrono::steady_clock::now() - r->startTime).count() < maxConnectionAge; + } + )) +{ +} + + +ref<RemoteStore::Connection> RemoteStore::openConnectionWrapper() +{ + if (failed) + throw Error("opening a connection to remote store '%s' previously failed", getUri()); + try { + return openConnection(); + } catch (...) { + failed = true; + throw; + } +} + + +UDSRemoteStore::UDSRemoteStore(const Params & params) + : Store(params) + , LocalFSStore(params) + , RemoteStore(params) +{ +} + + +UDSRemoteStore::UDSRemoteStore(std::string socket_path, const Params & params) + : Store(params) + , LocalFSStore(params) + , RemoteStore(params) + , path(socket_path) +{ +} + + +std::string UDSRemoteStore::getUri() +{ + if (path) { + return std::string("unix://") + *path; + } else { + return "daemon"; + } +} + + +ref<RemoteStore::Connection> UDSRemoteStore::openConnection() +{ + auto conn = make_ref<Connection>(); + + /* Connect to a daemon that does the privileged work for us. */ + conn->fd = socket(PF_UNIX, SOCK_STREAM + #ifdef SOCK_CLOEXEC + | SOCK_CLOEXEC + #endif + , 0); + if (!conn->fd) + throw SysError("cannot create Unix domain socket"); + closeOnExec(conn->fd.get()); + + string socketPath = path ? *path : settings.nixDaemonSocketFile; + + struct sockaddr_un addr; + addr.sun_family = AF_UNIX; + if (socketPath.size() + 1 >= sizeof(addr.sun_path)) + throw Error(format("socket path '%1%' is too long") % socketPath); + strcpy(addr.sun_path, socketPath.c_str()); + + if (::connect(conn->fd.get(), (struct sockaddr *) &addr, sizeof(addr)) == -1) + throw SysError(format("cannot connect to daemon at '%1%'") % socketPath); + + conn->from.fd = conn->fd.get(); + conn->to.fd = conn->fd.get(); + + conn->startTime = std::chrono::steady_clock::now(); + + initConnection(*conn); + + return conn; +} + + +void RemoteStore::initConnection(Connection & conn) +{ + /* Send the magic greeting, check for the reply. */ + try { + conn.to << WORKER_MAGIC_1; + conn.to.flush(); + unsigned int magic = readInt(conn.from); + if (magic != WORKER_MAGIC_2) throw Error("protocol mismatch"); + + conn.from >> conn.daemonVersion; + if (GET_PROTOCOL_MAJOR(conn.daemonVersion) != GET_PROTOCOL_MAJOR(PROTOCOL_VERSION)) + throw Error("Nix daemon protocol version not supported"); + if (GET_PROTOCOL_MINOR(conn.daemonVersion) < 10) + throw Error("the Nix daemon version is too old"); + conn.to << PROTOCOL_VERSION; + + if (GET_PROTOCOL_MINOR(conn.daemonVersion) >= 14) { + int cpu = sameMachine() && settings.lockCPU ? lockToCurrentCPU() : -1; + if (cpu != -1) + conn.to << 1 << cpu; + else + conn.to << 0; + } + + if (GET_PROTOCOL_MINOR(conn.daemonVersion) >= 11) + conn.to << false; + + auto ex = conn.processStderr(); + if (ex) std::rethrow_exception(ex); + } + catch (Error & e) { + throw Error("cannot open connection to remote store '%s': %s", getUri(), e.what()); + } + + setOptions(conn); +} + + +void RemoteStore::setOptions(Connection & conn) +{ + conn.to << wopSetOptions + << settings.keepFailed + << settings.keepGoing + << settings.tryFallback + << verbosity + << settings.maxBuildJobs + << settings.maxSilentTime + << true + << (settings.verboseBuild ? lvlError : lvlVomit) + << 0 // obsolete log type + << 0 /* obsolete print build trace */ + << settings.buildCores + << settings.useSubstitutes; + + if (GET_PROTOCOL_MINOR(conn.daemonVersion) >= 12) { + std::map<std::string, Config::SettingInfo> overrides; + globalConfig.getSettings(overrides, true); + overrides.erase(settings.keepFailed.name); + overrides.erase(settings.keepGoing.name); + overrides.erase(settings.tryFallback.name); + overrides.erase(settings.maxBuildJobs.name); + overrides.erase(settings.maxSilentTime.name); + overrides.erase(settings.buildCores.name); + overrides.erase(settings.useSubstitutes.name); + overrides.erase(settings.showTrace.name); + conn.to << overrides.size(); + for (auto & i : overrides) + conn.to << i.first << i.second.value; + } + + auto ex = conn.processStderr(); + if (ex) std::rethrow_exception(ex); +} + + +/* A wrapper around Pool<RemoteStore::Connection>::Handle that marks + the connection as bad (causing it to be closed) if a non-daemon + exception is thrown before the handle is closed. Such an exception + causes a deviation from the expected protocol and therefore a + desynchronization between the client and daemon. */ +struct ConnectionHandle +{ + Pool<RemoteStore::Connection>::Handle handle; + bool daemonException = false; + + ConnectionHandle(Pool<RemoteStore::Connection>::Handle && handle) + : handle(std::move(handle)) + { } + + ConnectionHandle(ConnectionHandle && h) + : handle(std::move(h.handle)) + { } + + ~ConnectionHandle() + { + if (!daemonException && std::uncaught_exception()) { + handle.markBad(); + debug("closing daemon connection because of an exception"); + } + } + + RemoteStore::Connection * operator -> () { return &*handle; } + + void processStderr(Sink * sink = 0, Source * source = 0) + { + auto ex = handle->processStderr(sink, source); + if (ex) { + daemonException = true; + std::rethrow_exception(ex); + } + } +}; + + +ConnectionHandle RemoteStore::getConnection() +{ + return ConnectionHandle(connections->get()); +} + + +bool RemoteStore::isValidPathUncached(const Path & path) +{ + auto conn(getConnection()); + conn->to << wopIsValidPath << path; + conn.processStderr(); + return readInt(conn->from); +} + + +PathSet RemoteStore::queryValidPaths(const PathSet & paths, SubstituteFlag maybeSubstitute) +{ + auto conn(getConnection()); + if (GET_PROTOCOL_MINOR(conn->daemonVersion) < 12) { + PathSet res; + for (auto & i : paths) + if (isValidPath(i)) res.insert(i); + return res; + } else { + conn->to << wopQueryValidPaths << paths; + conn.processStderr(); + return readStorePaths<PathSet>(*this, conn->from); + } +} + + +PathSet RemoteStore::queryAllValidPaths() +{ + auto conn(getConnection()); + conn->to << wopQueryAllValidPaths; + conn.processStderr(); + return readStorePaths<PathSet>(*this, conn->from); +} + + +PathSet RemoteStore::querySubstitutablePaths(const PathSet & paths) +{ + auto conn(getConnection()); + if (GET_PROTOCOL_MINOR(conn->daemonVersion) < 12) { + PathSet res; + for (auto & i : paths) { + conn->to << wopHasSubstitutes << i; + conn.processStderr(); + if (readInt(conn->from)) res.insert(i); + } + return res; + } else { + conn->to << wopQuerySubstitutablePaths << paths; + conn.processStderr(); + return readStorePaths<PathSet>(*this, conn->from); + } +} + + +void RemoteStore::querySubstitutablePathInfos(const PathSet & paths, + SubstitutablePathInfos & infos) +{ + if (paths.empty()) return; + + auto conn(getConnection()); + + if (GET_PROTOCOL_MINOR(conn->daemonVersion) < 12) { + + for (auto & i : paths) { + SubstitutablePathInfo info; + conn->to << wopQuerySubstitutablePathInfo << i; + conn.processStderr(); + unsigned int reply = readInt(conn->from); + if (reply == 0) continue; + info.deriver = readString(conn->from); + if (info.deriver != "") assertStorePath(info.deriver); + info.references = readStorePaths<PathSet>(*this, conn->from); + info.downloadSize = readLongLong(conn->from); + info.narSize = readLongLong(conn->from); + infos[i] = info; + } + + } else { + + conn->to << wopQuerySubstitutablePathInfos << paths; + conn.processStderr(); + size_t count = readNum<size_t>(conn->from); + for (size_t n = 0; n < count; n++) { + Path path = readStorePath(*this, conn->from); + SubstitutablePathInfo & info(infos[path]); + info.deriver = readString(conn->from); + if (info.deriver != "") assertStorePath(info.deriver); + info.references = readStorePaths<PathSet>(*this, conn->from); + info.downloadSize = readLongLong(conn->from); + info.narSize = readLongLong(conn->from); + } + + } +} + + +void RemoteStore::queryPathInfoUncached(const Path & path, + Callback<std::shared_ptr<ValidPathInfo>> callback) noexcept +{ + try { + std::shared_ptr<ValidPathInfo> info; + { + auto conn(getConnection()); + conn->to << wopQueryPathInfo << path; + try { + conn.processStderr(); + } catch (Error & e) { + // Ugly backwards compatibility hack. + if (e.msg().find("is not valid") != std::string::npos) + throw InvalidPath(e.what()); + throw; + } + if (GET_PROTOCOL_MINOR(conn->daemonVersion) >= 17) { + bool valid; conn->from >> valid; + if (!valid) throw InvalidPath(format("path '%s' is not valid") % path); + } + info = std::make_shared<ValidPathInfo>(); + info->path = path; + info->deriver = readString(conn->from); + if (info->deriver != "") assertStorePath(info->deriver); + info->narHash = Hash(readString(conn->from), htSHA256); + info->references = readStorePaths<PathSet>(*this, conn->from); + conn->from >> info->registrationTime >> info->narSize; + if (GET_PROTOCOL_MINOR(conn->daemonVersion) >= 16) { + conn->from >> info->ultimate; + info->sigs = readStrings<StringSet>(conn->from); + conn->from >> info->ca; + } + } + callback(std::move(info)); + } catch (...) { callback.rethrow(); } +} + + +void RemoteStore::queryReferrers(const Path & path, + PathSet & referrers) +{ + auto conn(getConnection()); + conn->to << wopQueryReferrers << path; + conn.processStderr(); + PathSet referrers2 = readStorePaths<PathSet>(*this, conn->from); + referrers.insert(referrers2.begin(), referrers2.end()); +} + + +PathSet RemoteStore::queryValidDerivers(const Path & path) +{ + auto conn(getConnection()); + conn->to << wopQueryValidDerivers << path; + conn.processStderr(); + return readStorePaths<PathSet>(*this, conn->from); +} + + +PathSet RemoteStore::queryDerivationOutputs(const Path & path) +{ + auto conn(getConnection()); + conn->to << wopQueryDerivationOutputs << path; + conn.processStderr(); + return readStorePaths<PathSet>(*this, conn->from); +} + + +PathSet RemoteStore::queryDerivationOutputNames(const Path & path) +{ + auto conn(getConnection()); + conn->to << wopQueryDerivationOutputNames << path; + conn.processStderr(); + return readStrings<PathSet>(conn->from); +} + + +Path RemoteStore::queryPathFromHashPart(const string & hashPart) +{ + auto conn(getConnection()); + conn->to << wopQueryPathFromHashPart << hashPart; + conn.processStderr(); + Path path = readString(conn->from); + if (!path.empty()) assertStorePath(path); + return path; +} + + +void RemoteStore::addToStore(const ValidPathInfo & info, Source & source, + RepairFlag repair, CheckSigsFlag checkSigs, std::shared_ptr<FSAccessor> accessor) +{ + auto conn(getConnection()); + + if (GET_PROTOCOL_MINOR(conn->daemonVersion) < 18) { + conn->to << wopImportPaths; + + auto source2 = sinkToSource([&](Sink & sink) { + sink << 1 // == path follows + ; + copyNAR(source, sink); + sink + << exportMagic + << info.path + << info.references + << info.deriver + << 0 // == no legacy signature + << 0 // == no path follows + ; + }); + + conn.processStderr(0, source2.get()); + + auto importedPaths = readStorePaths<PathSet>(*this, conn->from); + assert(importedPaths.size() <= 1); + } + + else { + conn->to << wopAddToStoreNar + << info.path << info.deriver << info.narHash.to_string(Base16, false) + << info.references << info.registrationTime << info.narSize + << info.ultimate << info.sigs << info.ca + << repair << !checkSigs; + bool tunnel = GET_PROTOCOL_MINOR(conn->daemonVersion) >= 21; + if (!tunnel) copyNAR(source, conn->to); + conn.processStderr(0, tunnel ? &source : nullptr); + } +} + + +Path RemoteStore::addToStore(const string & name, const Path & _srcPath, + bool recursive, HashType hashAlgo, PathFilter & filter, RepairFlag repair) +{ + if (repair) throw Error("repairing is not supported when building through the Nix daemon"); + + auto conn(getConnection()); + + Path srcPath(absPath(_srcPath)); + + conn->to << wopAddToStore << name + << ((hashAlgo == htSHA256 && recursive) ? 0 : 1) /* backwards compatibility hack */ + << (recursive ? 1 : 0) + << printHashType(hashAlgo); + + try { + conn->to.written = 0; + conn->to.warn = true; + connections->incCapacity(); + { + Finally cleanup([&]() { connections->decCapacity(); }); + dumpPath(srcPath, conn->to, filter); + } + conn->to.warn = false; + conn.processStderr(); + } catch (SysError & e) { + /* Daemon closed while we were sending the path. Probably OOM + or I/O error. */ + if (e.errNo == EPIPE) + try { + conn.processStderr(); + } catch (EndOfFile & e) { } + throw; + } + + return readStorePath(*this, conn->from); +} + + +Path RemoteStore::addTextToStore(const string & name, const string & s, + const PathSet & references, RepairFlag repair) +{ + if (repair) throw Error("repairing is not supported when building through the Nix daemon"); + + auto conn(getConnection()); + conn->to << wopAddTextToStore << name << s << references; + + conn.processStderr(); + return readStorePath(*this, conn->from); +} + + +void RemoteStore::buildPaths(const PathSet & drvPaths, BuildMode buildMode) +{ + auto conn(getConnection()); + conn->to << wopBuildPaths; + if (GET_PROTOCOL_MINOR(conn->daemonVersion) >= 13) { + conn->to << drvPaths; + if (GET_PROTOCOL_MINOR(conn->daemonVersion) >= 15) + conn->to << buildMode; + else + /* Old daemons did not take a 'buildMode' parameter, so we + need to validate it here on the client side. */ + if (buildMode != bmNormal) + throw Error("repairing or checking is not supported when building through the Nix daemon"); + } else { + /* For backwards compatibility with old daemons, strip output + identifiers. */ + PathSet drvPaths2; + for (auto & i : drvPaths) + drvPaths2.insert(string(i, 0, i.find('!'))); + conn->to << drvPaths2; + } + conn.processStderr(); + readInt(conn->from); +} + + +BuildResult RemoteStore::buildDerivation(const Path & drvPath, const BasicDerivation & drv, + BuildMode buildMode) +{ + auto conn(getConnection()); + conn->to << wopBuildDerivation << drvPath << drv << buildMode; + conn.processStderr(); + BuildResult res; + unsigned int status; + conn->from >> status >> res.errorMsg; + res.status = (BuildResult::Status) status; + return res; +} + + +void RemoteStore::ensurePath(const Path & path) +{ + auto conn(getConnection()); + conn->to << wopEnsurePath << path; + conn.processStderr(); + readInt(conn->from); +} + + +void RemoteStore::addTempRoot(const Path & path) +{ + auto conn(getConnection()); + conn->to << wopAddTempRoot << path; + conn.processStderr(); + readInt(conn->from); +} + + +void RemoteStore::addIndirectRoot(const Path & path) +{ + auto conn(getConnection()); + conn->to << wopAddIndirectRoot << path; + conn.processStderr(); + readInt(conn->from); +} + + +void RemoteStore::syncWithGC() +{ + auto conn(getConnection()); + conn->to << wopSyncWithGC; + conn.processStderr(); + readInt(conn->from); +} + + +Roots RemoteStore::findRoots(bool censor) +{ + auto conn(getConnection()); + conn->to << wopFindRoots; + conn.processStderr(); + size_t count = readNum<size_t>(conn->from); + Roots result; + while (count--) { + Path link = readString(conn->from); + Path target = readStorePath(*this, conn->from); + result[target].emplace(link); + } + return result; +} + + +void RemoteStore::collectGarbage(const GCOptions & options, GCResults & results) +{ + auto conn(getConnection()); + + conn->to + << wopCollectGarbage << options.action << options.pathsToDelete << options.ignoreLiveness + << options.maxFreed + /* removed options */ + << 0 << 0 << 0; + + conn.processStderr(); + + results.paths = readStrings<PathSet>(conn->from); + results.bytesFreed = readLongLong(conn->from); + readLongLong(conn->from); // obsolete + + { + auto state_(Store::state.lock()); + state_->pathInfoCache.clear(); + } +} + + +void RemoteStore::optimiseStore() +{ + auto conn(getConnection()); + conn->to << wopOptimiseStore; + conn.processStderr(); + readInt(conn->from); +} + + +bool RemoteStore::verifyStore(bool checkContents, RepairFlag repair) +{ + auto conn(getConnection()); + conn->to << wopVerifyStore << checkContents << repair; + conn.processStderr(); + return readInt(conn->from); +} + + +void RemoteStore::addSignatures(const Path & storePath, const StringSet & sigs) +{ + auto conn(getConnection()); + conn->to << wopAddSignatures << storePath << sigs; + conn.processStderr(); + readInt(conn->from); +} + + +void RemoteStore::queryMissing(const PathSet & targets, + PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown, + unsigned long long & downloadSize, unsigned long long & narSize) +{ + { + auto conn(getConnection()); + if (GET_PROTOCOL_MINOR(conn->daemonVersion) < 19) + // Don't hold the connection handle in the fallback case + // to prevent a deadlock. + goto fallback; + conn->to << wopQueryMissing << targets; + conn.processStderr(); + willBuild = readStorePaths<PathSet>(*this, conn->from); + willSubstitute = readStorePaths<PathSet>(*this, conn->from); + unknown = readStorePaths<PathSet>(*this, conn->from); + conn->from >> downloadSize >> narSize; + return; + } + + fallback: + return Store::queryMissing(targets, willBuild, willSubstitute, + unknown, downloadSize, narSize); +} + + +void RemoteStore::connect() +{ + auto conn(getConnection()); +} + + +unsigned int RemoteStore::getProtocol() +{ + auto conn(connections->get()); + return conn->daemonVersion; +} + + +void RemoteStore::flushBadConnections() +{ + connections->flushBad(); +} + + +RemoteStore::Connection::~Connection() +{ + try { + to.flush(); + } catch (...) { + ignoreException(); + } +} + + +static Logger::Fields readFields(Source & from) +{ + Logger::Fields fields; + size_t size = readInt(from); + for (size_t n = 0; n < size; n++) { + auto type = (decltype(Logger::Field::type)) readInt(from); + if (type == Logger::Field::tInt) + fields.push_back(readNum<uint64_t>(from)); + else if (type == Logger::Field::tString) + fields.push_back(readString(from)); + else + throw Error("got unsupported field type %x from Nix daemon", (int) type); + } + return fields; +} + + +std::exception_ptr RemoteStore::Connection::processStderr(Sink * sink, Source * source) +{ + to.flush(); + + while (true) { + + auto msg = readNum<uint64_t>(from); + + if (msg == STDERR_WRITE) { + string s = readString(from); + if (!sink) throw Error("no sink"); + (*sink)(s); + } + + else if (msg == STDERR_READ) { + if (!source) throw Error("no source"); + size_t len = readNum<size_t>(from); + auto buf = std::make_unique<unsigned char[]>(len); + writeString(buf.get(), source->read(buf.get(), len), to); + to.flush(); + } + + else if (msg == STDERR_ERROR) { + string error = readString(from); + unsigned int status = readInt(from); + return std::make_exception_ptr(Error(status, error)); + } + + else if (msg == STDERR_NEXT) + printError(chomp(readString(from))); + + else if (msg == STDERR_START_ACTIVITY) { + auto act = readNum<ActivityId>(from); + auto lvl = (Verbosity) readInt(from); + auto type = (ActivityType) readInt(from); + auto s = readString(from); + auto fields = readFields(from); + auto parent = readNum<ActivityId>(from); + logger->startActivity(act, lvl, type, s, fields, parent); + } + + else if (msg == STDERR_STOP_ACTIVITY) { + auto act = readNum<ActivityId>(from); + logger->stopActivity(act); + } + + else if (msg == STDERR_RESULT) { + auto act = readNum<ActivityId>(from); + auto type = (ResultType) readInt(from); + auto fields = readFields(from); + logger->result(act, type, fields); + } + + else if (msg == STDERR_LAST) + break; + + else + throw Error("got unknown message type %x from Nix daemon", msg); + } + + return nullptr; +} + +static std::string uriScheme = "unix://"; + +static RegisterStoreImplementation regStore([]( + const std::string & uri, const Store::Params & params) + -> std::shared_ptr<Store> +{ + if (std::string(uri, 0, uriScheme.size()) != uriScheme) return 0; + return std::make_shared<UDSRemoteStore>(std::string(uri, uriScheme.size()), params); +}); + +} |