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Nix/src/libstore/remote-store.cc

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#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 {
template<> StorePathSet readStorePaths(const Store & store, Source & from)
{
StorePathSet paths;
for (auto & i : readStrings<Strings>(from))
paths.insert(store.parseStorePath(i));
return paths;
}
void writeStorePaths(const Store & store, Sink & out, const StorePathSet & paths)
{
out << paths.size();
for (auto & i : paths)
out << store.printStorePath(i);
}
/* 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 StorePath & path)
{
auto conn(getConnection());
conn->to << wopIsValidPath << printStorePath(path);
conn.processStderr();
return readInt(conn->from);
}
StorePathSet RemoteStore::queryValidPaths(const StorePathSet & paths, SubstituteFlag maybeSubstitute)
{
auto conn(getConnection());
if (GET_PROTOCOL_MINOR(conn->daemonVersion) < 12) {
StorePathSet res;
for (auto & i : paths)
if (isValidPath(i)) res.insert(i.clone());
return res;
} else {
conn->to << wopQueryValidPaths;
writeStorePaths(*this, conn->to, paths);
conn.processStderr();
return readStorePaths<StorePathSet>(*this, conn->from);
}
}
StorePathSet RemoteStore::queryAllValidPaths()
{
auto conn(getConnection());
conn->to << wopQueryAllValidPaths;
conn.processStderr();
return readStorePaths<StorePathSet>(*this, conn->from);
}
StorePathSet RemoteStore::querySubstitutablePaths(const StorePathSet & paths)
{
auto conn(getConnection());
if (GET_PROTOCOL_MINOR(conn->daemonVersion) < 12) {
StorePathSet res;
for (auto & i : paths) {
conn->to << wopHasSubstitutes << printStorePath(i);
conn.processStderr();
if (readInt(conn->from)) res.insert(i.clone());
}
return res;
} else {
conn->to << wopQuerySubstitutablePaths;
writeStorePaths(*this, conn->to, paths);
conn.processStderr();
return readStorePaths<StorePathSet>(*this, conn->from);
}
}
void RemoteStore::querySubstitutablePathInfos(const StorePathSet & 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 << printStorePath(i);
conn.processStderr();
unsigned int reply = readInt(conn->from);
if (reply == 0) continue;
auto deriver = readString(conn->from);
if (deriver != "")
info.deriver = parseStorePath(deriver);
info.references = readStorePaths<StorePathSet>(*this, conn->from);
info.downloadSize = readLongLong(conn->from);
info.narSize = readLongLong(conn->from);
infos.insert_or_assign(i.clone(), std::move(info));
}
} else {
conn->to << wopQuerySubstitutablePathInfos;
writeStorePaths(*this, conn->to, paths);
conn.processStderr();
size_t count = readNum<size_t>(conn->from);
for (size_t n = 0; n < count; n++) {
SubstitutablePathInfo & info(infos[parseStorePath(readString(conn->from))]);
auto deriver = readString(conn->from);
if (deriver != "")
info.deriver = parseStorePath(deriver);
info.references = readStorePaths<StorePathSet>(*this, conn->from);
info.downloadSize = readLongLong(conn->from);
info.narSize = readLongLong(conn->from);
}
}
}
void RemoteStore::queryPathInfoUncached(const StorePath & path,
Callback<std::shared_ptr<const ValidPathInfo>> callback) noexcept
{
try {
std::shared_ptr<ValidPathInfo> info;
{
auto conn(getConnection());
conn->to << wopQueryPathInfo << printStorePath(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("path '%s' is not valid", printStorePath(path));
}
info = std::make_shared<ValidPathInfo>(path.clone());
auto deriver = readString(conn->from);
if (deriver != "") info->deriver = parseStorePath(deriver);
info->narHash = Hash(readString(conn->from), htSHA256);
info->references = readStorePaths<StorePathSet>(*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 StorePath & path,
StorePathSet & referrers)
{
auto conn(getConnection());
conn->to << wopQueryReferrers << printStorePath(path);
conn.processStderr();
for (auto & i : readStorePaths<StorePathSet>(*this, conn->from))
referrers.insert(i.clone());
}
StorePathSet RemoteStore::queryValidDerivers(const StorePath & path)
{
auto conn(getConnection());
conn->to << wopQueryValidDerivers << printStorePath(path);
conn.processStderr();
return readStorePaths<StorePathSet>(*this, conn->from);
}
StorePathSet RemoteStore::queryDerivationOutputs(const StorePath & path)
{
auto conn(getConnection());
conn->to << wopQueryDerivationOutputs << printStorePath(path);
conn.processStderr();
return readStorePaths<StorePathSet>(*this, conn->from);
}
PathSet RemoteStore::queryDerivationOutputNames(const StorePath & path)
{
auto conn(getConnection());
conn->to << wopQueryDerivationOutputNames << printStorePath(path);
conn.processStderr();
return readStrings<PathSet>(conn->from);
}
std::optional<StorePath> RemoteStore::queryPathFromHashPart(const std::string & hashPart)
{
auto conn(getConnection());
conn->to << wopQueryPathFromHashPart << hashPart;
conn.processStderr();
Path path = readString(conn->from);
if (path.empty()) return {};
return parseStorePath(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
<< printStorePath(info.path);
writeStorePaths(*this, sink, info.references);
sink
<< (info.deriver ? printStorePath(*info.deriver) : "")
<< 0 // == no legacy signature
<< 0 // == no path follows
;
});
conn.processStderr(0, source2.get());
auto importedPaths = readStorePaths<StorePathSet>(*this, conn->from);
assert(importedPaths.size() <= 1);
}
else {
conn->to << wopAddToStoreNar
<< printStorePath(info.path)
<< (info.deriver ? printStorePath(*info.deriver) : "")
<< info.narHash.to_string(Base16, false);
writeStorePaths(*this, conn->to, info.references);
conn->to << 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);
}
}
StorePath 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 parseStorePath(readString(conn->from));
}
StorePath RemoteStore::addTextToStore(const string & name, const string & s,
const StorePathSet & 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;
writeStorePaths(*this, conn->to, references);
conn.processStderr();
return parseStorePath(readString(conn->from));
}
void RemoteStore::buildPaths(const std::vector<StorePathWithOutputs> & drvPaths, BuildMode buildMode)
{
auto conn(getConnection());
conn->to << wopBuildPaths;
assert(GET_PROTOCOL_MINOR(conn->daemonVersion) >= 13);
Strings ss;
for (auto & p : drvPaths)
ss.push_back(p.to_string(*this));
conn->to << ss;
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");
conn.processStderr();
readInt(conn->from);
}
BuildResult RemoteStore::buildDerivation(const StorePath & drvPath, const BasicDerivation & drv,
BuildMode buildMode)
{
auto conn(getConnection());
conn->to << wopBuildDerivation << printStorePath(drvPath);
writeDerivation(conn->to, *this, drv);
conn->to << buildMode;
conn.processStderr();
BuildResult res;
unsigned int status;
conn->from >> status >> res.errorMsg;
res.status = (BuildResult::Status) status;
return res;
}
void RemoteStore::ensurePath(const StorePath & path)
{
auto conn(getConnection());
conn->to << wopEnsurePath << printStorePath(path);
conn.processStderr();
readInt(conn->from);
}
void RemoteStore::addTempRoot(const StorePath & path)
{
auto conn(getConnection());
conn->to << wopAddTempRoot << printStorePath(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);
auto target = parseStorePath(readString(conn->from));
result[std::move(target)].emplace(link);
}
return result;
}
void RemoteStore::collectGarbage(const GCOptions & options, GCResults & results)
{
auto conn(getConnection());
conn->to
<< wopCollectGarbage << options.action;
writeStorePaths(*this, conn->to, options.pathsToDelete);
conn->to << 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 StorePath & storePath, const StringSet & sigs)
{
auto conn(getConnection());
conn->to << wopAddSignatures << printStorePath(storePath) << sigs;
conn.processStderr();
readInt(conn->from);
}
void RemoteStore::queryMissing(const std::vector<StorePathWithOutputs> & targets,
StorePathSet & willBuild, StorePathSet & willSubstitute, StorePathSet & 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;
Strings ss;
for (auto & p : targets)
ss.push_back(p.to_string(*this));
conn->to << ss;
conn.processStderr();
willBuild = readStorePaths<StorePathSet>(*this, conn->from);
willSubstitute = readStorePaths<StorePathSet>(*this, conn->from);
unknown = readStorePaths<StorePathSet>(*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);
});
}
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