312 lines
8.6 KiB
C++
312 lines
8.6 KiB
C++
#include "legacy-ssh-store.hh"
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#include "ssh-store-config.hh"
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#include "archive.hh"
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#include "pool.hh"
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#include "remote-store.hh"
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#include "serve-protocol.hh"
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#include "serve-protocol-impl.hh"
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#include "build-result.hh"
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#include "store-api.hh"
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#include "path-with-outputs.hh"
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#include "ssh.hh"
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#include "derivations.hh"
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#include "callback.hh"
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namespace nix {
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std::string LegacySSHStoreConfig::doc()
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{
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return
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#include "legacy-ssh-store.md"
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;
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}
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struct LegacySSHStore::Connection : public ServeProto::BasicClientConnection
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{
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std::unique_ptr<SSHMaster::Connection> sshConn;
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bool good = true;
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};
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LegacySSHStore::LegacySSHStore(const std::string & scheme, const std::string & host, const Params & params)
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: StoreConfig(params)
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, CommonSSHStoreConfig(params)
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, LegacySSHStoreConfig(params)
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, Store(params)
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, host(host)
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, connections(make_ref<Pool<Connection>>(
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std::max(1, (int) maxConnections),
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[this]() { return openConnection(); },
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[](const ref<Connection> & r) { return r->good; }
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))
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, master(
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host,
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sshKey,
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sshPublicHostKey,
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// Use SSH master only if using more than 1 connection.
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connections->capacity() > 1,
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compress,
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logFD)
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{
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}
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ref<LegacySSHStore::Connection> LegacySSHStore::openConnection()
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{
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auto conn = make_ref<Connection>();
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conn->sshConn = master.startCommand(
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fmt("%s --serve --write", remoteProgram)
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+ (remoteStore.get() == "" ? "" : " --store " + shellEscape(remoteStore.get())));
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conn->to = FdSink(conn->sshConn->in.get());
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conn->from = FdSource(conn->sshConn->out.get());
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StringSink saved;
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TeeSource tee(conn->from, saved);
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try {
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conn->remoteVersion = ServeProto::BasicClientConnection::handshake(
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conn->to, tee, SERVE_PROTOCOL_VERSION, host);
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} catch (SerialisationError & e) {
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// in.close(): Don't let the remote block on us not writing.
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conn->sshConn->in.close();
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{
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NullSink nullSink;
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conn->from.drainInto(nullSink);
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}
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throw Error("'nix-store --serve' protocol mismatch from '%s', got '%s'",
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host, chomp(saved.s));
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} catch (EndOfFile & e) {
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throw Error("cannot connect to '%1%'", host);
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}
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return conn;
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};
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std::string LegacySSHStore::getUri()
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{
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return *uriSchemes().begin() + "://" + host;
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}
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void LegacySSHStore::queryPathInfoUncached(const StorePath & path,
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Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept
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{
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try {
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auto conn(connections->get());
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/* No longer support missing NAR hash */
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assert(GET_PROTOCOL_MINOR(conn->remoteVersion) >= 4);
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debug("querying remote host '%s' for info on '%s'", host, printStorePath(path));
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conn->to << ServeProto::Command::QueryPathInfos << PathSet{printStorePath(path)};
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conn->to.flush();
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auto p = readString(conn->from);
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if (p.empty()) return callback(nullptr);
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auto path2 = parseStorePath(p);
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assert(path == path2);
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auto info = std::make_shared<ValidPathInfo>(
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path,
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ServeProto::Serialise<UnkeyedValidPathInfo>::read(*this, *conn));
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if (info->narHash == Hash::dummy)
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throw Error("NAR hash is now mandatory");
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auto s = readString(conn->from);
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assert(s == "");
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callback(std::move(info));
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} catch (...) { callback.rethrow(); }
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}
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void LegacySSHStore::addToStore(const ValidPathInfo & info, Source & source,
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RepairFlag repair, CheckSigsFlag checkSigs)
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{
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debug("adding path '%s' to remote host '%s'", printStorePath(info.path), host);
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auto conn(connections->get());
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if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 5) {
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conn->to
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<< ServeProto::Command::AddToStoreNar
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<< printStorePath(info.path)
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<< (info.deriver ? printStorePath(*info.deriver) : "")
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<< info.narHash.to_string(HashFormat::Base16, false);
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ServeProto::write(*this, *conn, info.references);
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conn->to
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<< info.registrationTime
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<< info.narSize
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<< info.ultimate
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<< info.sigs
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<< renderContentAddress(info.ca);
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try {
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copyNAR(source, conn->to);
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} catch (...) {
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conn->good = false;
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throw;
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}
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conn->to.flush();
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} else {
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conn->to
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<< ServeProto::Command::ImportPaths
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<< 1;
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try {
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copyNAR(source, conn->to);
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} catch (...) {
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conn->good = false;
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throw;
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}
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conn->to
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<< exportMagic
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<< printStorePath(info.path);
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ServeProto::write(*this, *conn, info.references);
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conn->to
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<< (info.deriver ? printStorePath(*info.deriver) : "")
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<< 0
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<< 0;
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conn->to.flush();
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}
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if (readInt(conn->from) != 1)
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throw Error("failed to add path '%s' to remote host '%s'", printStorePath(info.path), host);
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}
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void LegacySSHStore::narFromPath(const StorePath & path, Sink & sink)
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{
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auto conn(connections->get());
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conn->to << ServeProto::Command::DumpStorePath << printStorePath(path);
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conn->to.flush();
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copyNAR(conn->from, sink);
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}
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static ServeProto::BuildOptions buildSettings()
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{
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return {
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.maxSilentTime = settings.maxSilentTime,
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.buildTimeout = settings.buildTimeout,
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.maxLogSize = settings.maxLogSize,
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.nrRepeats = 0, // buildRepeat hasn't worked for ages anyway
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.enforceDeterminism = 0,
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.keepFailed = settings.keepFailed,
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};
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}
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BuildResult LegacySSHStore::buildDerivation(const StorePath & drvPath, const BasicDerivation & drv,
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BuildMode buildMode)
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{
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auto conn(connections->get());
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conn->putBuildDerivationRequest(*this, drvPath, drv, buildSettings());
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return ServeProto::Serialise<BuildResult>::read(*this, *conn);
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}
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void LegacySSHStore::buildPaths(const std::vector<DerivedPath> & drvPaths, BuildMode buildMode, std::shared_ptr<Store> evalStore)
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{
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if (evalStore && evalStore.get() != this)
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throw Error("building on an SSH store is incompatible with '--eval-store'");
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auto conn(connections->get());
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conn->to << ServeProto::Command::BuildPaths;
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Strings ss;
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for (auto & p : drvPaths) {
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auto sOrDrvPath = StorePathWithOutputs::tryFromDerivedPath(p);
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std::visit(overloaded {
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[&](const StorePathWithOutputs & s) {
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ss.push_back(s.to_string(*this));
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},
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[&](const StorePath & drvPath) {
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throw Error("wanted to fetch '%s' but the legacy ssh protocol doesn't support merely substituting drv files via the build paths command. It would build them instead. Try using ssh-ng://", printStorePath(drvPath));
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},
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[&](std::monostate) {
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throw Error("wanted build derivation that is itself a build product, but the legacy ssh protocol doesn't support that. Try using ssh-ng://");
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},
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}, sOrDrvPath);
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}
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conn->to << ss;
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ServeProto::write(*this, *conn, buildSettings());
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conn->to.flush();
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BuildResult result;
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result.status = (BuildResult::Status) readInt(conn->from);
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if (!result.success()) {
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conn->from >> result.errorMsg;
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throw Error(result.status, result.errorMsg);
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}
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}
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void LegacySSHStore::computeFSClosure(const StorePathSet & paths,
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StorePathSet & out, bool flipDirection,
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bool includeOutputs, bool includeDerivers)
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{
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if (flipDirection || includeDerivers) {
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Store::computeFSClosure(paths, out, flipDirection, includeOutputs, includeDerivers);
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return;
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}
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auto conn(connections->get());
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conn->to
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<< ServeProto::Command::QueryClosure
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<< includeOutputs;
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ServeProto::write(*this, *conn, paths);
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conn->to.flush();
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for (auto & i : ServeProto::Serialise<StorePathSet>::read(*this, *conn))
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out.insert(i);
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}
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StorePathSet LegacySSHStore::queryValidPaths(const StorePathSet & paths,
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SubstituteFlag maybeSubstitute)
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{
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auto conn(connections->get());
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return conn->queryValidPaths(*this,
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false, paths, maybeSubstitute);
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}
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void LegacySSHStore::connect()
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{
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auto conn(connections->get());
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}
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unsigned int LegacySSHStore::getProtocol()
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{
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auto conn(connections->get());
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return conn->remoteVersion;
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}
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/**
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* The legacy ssh protocol doesn't support checking for trusted-user.
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* Try using ssh-ng:// instead if you want to know.
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*/
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std::optional<TrustedFlag> isTrustedClient()
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{
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return std::nullopt;
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}
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static RegisterStoreImplementation<LegacySSHStore, LegacySSHStoreConfig> regLegacySSHStore;
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}
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