bbe97dff8b
Most functions now take a StorePath argument rather than a Path (which is just an alias for std::string). The StorePath constructor ensures that the path is syntactically correct (i.e. it looks like <store-dir>/<base32-hash>-<name>). Similarly, functions like buildPaths() now take a StorePathWithOutputs, rather than abusing Path by adding a '!<outputs>' suffix. Note that the StorePath type is implemented in Rust. This involves some hackery to allow Rust values to be used directly in C++, via a helper type whose destructor calls the Rust type's drop() function. The main issue is the dynamic nature of C++ move semantics: after we have moved a Rust value, we should not call the drop function on the original value. So when we move a value, we set the original value to bitwise zero, and the destructor only calls drop() if the value is not bitwise zero. This should be sufficient for most types. Also lots of minor cleanups to the C++ API to make it more modern (e.g. using std::optional and std::string_view in some places).
298 lines
9.4 KiB
C++
298 lines
9.4 KiB
C++
#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 "store-api.hh"
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#include "worker-protocol.hh"
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#include "ssh.hh"
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#include "derivations.hh"
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namespace nix {
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static std::string uriScheme = "ssh://";
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struct LegacySSHStore : public Store
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{
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const Setting<int> maxConnections{this, 1, "max-connections", "maximum number of concurrent SSH connections"};
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const Setting<Path> sshKey{this, "", "ssh-key", "path to an SSH private key"};
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const Setting<bool> compress{this, false, "compress", "whether to compress the connection"};
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const Setting<Path> remoteProgram{this, "nix-store", "remote-program", "path to the nix-store executable on the remote system"};
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const Setting<std::string> remoteStore{this, "", "remote-store", "URI of the store on the remote system"};
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// Hack for getting remote build log output.
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const Setting<int> logFD{this, -1, "log-fd", "file descriptor to which SSH's stderr is connected"};
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struct Connection
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{
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std::unique_ptr<SSHMaster::Connection> sshConn;
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FdSink to;
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FdSource from;
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int remoteVersion;
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bool good = true;
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};
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std::string host;
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ref<Pool<Connection>> connections;
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SSHMaster master;
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LegacySSHStore(const string & host, const Params & 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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// 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<Connection> 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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try {
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conn->to << SERVE_MAGIC_1 << SERVE_PROTOCOL_VERSION;
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conn->to.flush();
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unsigned int magic = readInt(conn->from);
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if (magic != SERVE_MAGIC_2)
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throw Error("protocol mismatch with 'nix-store --serve' on '%s'", host);
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conn->remoteVersion = readInt(conn->from);
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if (GET_PROTOCOL_MAJOR(conn->remoteVersion) != 0x200)
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throw Error("unsupported 'nix-store --serve' protocol version on '%s'", host);
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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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string getUri() override
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{
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return uriScheme + host;
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}
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void queryPathInfoUncached(const StorePath & path,
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Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept override
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{
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try {
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auto conn(connections->get());
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debug("querying remote host '%s' for info on '%s'", host, printStorePath(path));
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conn->to << cmdQueryPathInfos << 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 info = std::make_shared<ValidPathInfo>(parseStorePath(p));
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assert(path == info->path);
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PathSet references;
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auto deriver = readString(conn->from);
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if (deriver != "")
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info->deriver = parseStorePath(deriver);
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info->references = readStorePaths<StorePathSet>(*this, conn->from);
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readLongLong(conn->from); // download size
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info->narSize = readLongLong(conn->from);
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if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 4) {
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auto s = readString(conn->from);
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info->narHash = s.empty() ? Hash() : Hash(s);
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conn->from >> info->ca;
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info->sigs = readStrings<StringSet>(conn->from);
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}
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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 addToStore(const ValidPathInfo & info, Source & source,
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RepairFlag repair, CheckSigsFlag checkSigs,
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std::shared_ptr<FSAccessor> accessor) override
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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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<< cmdAddToStoreNar
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<< printStorePath(info.path)
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<< (info.deriver ? printStorePath(*info.deriver) : "")
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<< info.narHash.to_string(Base16, false);
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writeStorePaths(*this, conn->to, 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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<< 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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<< cmdImportPaths
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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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writeStorePaths(*this, conn->to, 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 narFromPath(const StorePath & path, Sink & sink) override
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{
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auto conn(connections->get());
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conn->to << cmdDumpStorePath << 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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std::optional<StorePath> queryPathFromHashPart(const std::string & hashPart) override
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{ unsupported("queryPathFromHashPart"); }
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StorePath addToStore(const string & name, const Path & srcPath,
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bool recursive, HashType hashAlgo,
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PathFilter & filter, RepairFlag repair) override
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{ unsupported("addToStore"); }
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StorePath addTextToStore(const string & name, const string & s,
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const StorePathSet & references, RepairFlag repair) override
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{ unsupported("addTextToStore"); }
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BuildResult buildDerivation(const StorePath & drvPath, const BasicDerivation & drv,
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BuildMode buildMode) override
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{
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auto conn(connections->get());
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conn->to
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<< cmdBuildDerivation
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<< printStorePath(drvPath);
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writeDerivation(conn->to, *this, drv);
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conn->to
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<< settings.maxSilentTime
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<< settings.buildTimeout;
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if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 2)
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conn->to
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<< settings.maxLogSize;
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if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 3)
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conn->to
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<< settings.buildRepeat
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<< settings.enforceDeterminism;
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conn->to.flush();
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BuildResult status;
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status.status = (BuildResult::Status) readInt(conn->from);
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conn->from >> status.errorMsg;
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if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 3)
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conn->from >> status.timesBuilt >> status.isNonDeterministic >> status.startTime >> status.stopTime;
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return status;
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}
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void ensurePath(const StorePath & path) override
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{ unsupported("ensurePath"); }
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void computeFSClosure(const StorePathSet & paths,
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StorePathSet & out, bool flipDirection = false,
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bool includeOutputs = false, bool includeDerivers = false) override
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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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<< cmdQueryClosure
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<< includeOutputs;
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writeStorePaths(*this, conn->to, paths);
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conn->to.flush();
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for (auto & i : readStorePaths<StorePathSet>(*this, conn->from))
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out.insert(i.clone());
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}
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StorePathSet queryValidPaths(const StorePathSet & paths,
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SubstituteFlag maybeSubstitute = NoSubstitute) override
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{
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auto conn(connections->get());
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conn->to
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<< cmdQueryValidPaths
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<< false // lock
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<< maybeSubstitute;
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writeStorePaths(*this, conn->to, paths);
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conn->to.flush();
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return readStorePaths<StorePathSet>(*this, conn->from);
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}
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void connect() override
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{
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auto conn(connections->get());
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}
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unsigned int getProtocol() override
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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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static RegisterStoreImplementation regStore([](
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const std::string & uri, const Store::Params & params)
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-> std::shared_ptr<Store>
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{
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if (std::string(uri, 0, uriScheme.size()) != uriScheme) return 0;
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return std::make_shared<LegacySSHStore>(std::string(uri, uriScheme.size()), params);
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});
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}
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