lix/src/libstore/legacy-ssh-store.cc
Eelco Dolstra fcca702a96
Replace a few bool flags with enums
Functions like copyClosure() had 3 bool arguments, which creates a
severe risk of mixing up arguments.

Also, implement copyClosure() using copyPaths().
2017-07-03 11:38:08 +02:00

282 lines
8.3 KiB
C++
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

#include "archive.hh"
#include "pool.hh"
#include "remote-store.hh"
#include "serve-protocol.hh"
#include "store-api.hh"
#include "worker-protocol.hh"
#include "ssh.hh"
#include "derivations.hh"
namespace nix {
static std::string uriScheme = "ssh://";
struct LegacySSHStore : public Store
{
const Setting<int> maxConnections{this, 1, "max-connections", "maximum number of concurrent SSH connections"};
const Setting<Path> sshKey{this, "", "ssh-key", "path to an SSH private key"};
const Setting<bool> compress{this, false, "compress", "whether to compress the connection"};
// Hack for getting remote build log output.
const Setting<int> logFD{this, -1, "log-fd", "file descriptor to which SSH's stderr is connected"};
struct Connection
{
std::unique_ptr<SSHMaster::Connection> sshConn;
FdSink to;
FdSource from;
int remoteVersion;
};
std::string host;
ref<Pool<Connection>> connections;
SSHMaster master;
LegacySSHStore(const string & host, const Params & params)
: Store(params)
, host(host)
, connections(make_ref<Pool<Connection>>(
std::max(1, (int) maxConnections),
[this]() { return openConnection(); },
[](const ref<Connection> & r) { return true; }
))
, master(
host,
sshKey,
// Use SSH master only if using more than 1 connection.
connections->capacity() > 1,
compress,
logFD)
{
}
ref<Connection> openConnection()
{
auto conn = make_ref<Connection>();
conn->sshConn = master.startCommand("nix-store --serve --write");
conn->to = FdSink(conn->sshConn->in.get());
conn->from = FdSource(conn->sshConn->out.get());
try {
conn->to << SERVE_MAGIC_1 << SERVE_PROTOCOL_VERSION;
conn->to.flush();
unsigned int magic = readInt(conn->from);
if (magic != SERVE_MAGIC_2)
throw Error("protocol mismatch with nix-store --serve on %s", host);
conn->remoteVersion = readInt(conn->from);
if (GET_PROTOCOL_MAJOR(conn->remoteVersion) != 0x200)
throw Error("unsupported nix-store --serve protocol version on %s", host);
} catch (EndOfFile & e) {
throw Error("cannot connect to %1%", host);
}
return conn;
};
string getUri() override
{
return uriScheme + host;
}
void queryPathInfoUncached(const Path & path,
std::function<void(std::shared_ptr<ValidPathInfo>)> success,
std::function<void(std::exception_ptr exc)> failure) override
{
sync2async<std::shared_ptr<ValidPathInfo>>(success, failure, [&]() -> std::shared_ptr<ValidPathInfo> {
auto conn(connections->get());
debug("querying remote host %s for info on %s", host, path);
conn->to << cmdQueryPathInfos << PathSet{path};
conn->to.flush();
auto info = std::make_shared<ValidPathInfo>();
conn->from >> info->path;
if (info->path.empty()) return nullptr;
assert(path == info->path);
PathSet references;
conn->from >> info->deriver;
info->references = readStorePaths<PathSet>(*this, conn->from);
readLongLong(conn->from); // download size
info->narSize = readLongLong(conn->from);
auto s = readString(conn->from);
assert(s == "");
return info;
});
}
void addToStore(const ValidPathInfo & info, const ref<std::string> & nar,
RepairFlag repair, CheckSigsFlag checkSigs,
std::shared_ptr<FSAccessor> accessor) override
{
debug("adding path %s to remote host %s", info.path, host);
auto conn(connections->get());
conn->to
<< cmdImportPaths
<< 1;
conn->to(*nar);
conn->to
<< exportMagic
<< info.path
<< info.references
<< info.deriver
<< 0
<< 0;
conn->to.flush();
if (readInt(conn->from) != 1)
throw Error("failed to add path %s to remote host %s, info.path, host");
}
void narFromPath(const Path & path, Sink & sink) override
{
auto conn(connections->get());
conn->to << cmdDumpStorePath << path;
conn->to.flush();
/* FIXME: inefficient. */
ParseSink parseSink; /* null sink; just parse the NAR */
TeeSource savedNAR(conn->from);
parseDump(parseSink, savedNAR);
sink(*savedNAR.data);
}
PathSet queryAllValidPaths() override { unsupported(); }
void queryReferrers(const Path & path, PathSet & referrers) override
{ unsupported(); }
PathSet queryDerivationOutputs(const Path & path) override
{ unsupported(); }
StringSet queryDerivationOutputNames(const Path & path) override
{ unsupported(); }
Path queryPathFromHashPart(const string & hashPart) override
{ unsupported(); }
Path addToStore(const string & name, const Path & srcPath,
bool recursive, HashType hashAlgo,
PathFilter & filter, RepairFlag repair) override
{ unsupported(); }
Path addTextToStore(const string & name, const string & s,
const PathSet & references, RepairFlag repair) override
{ unsupported(); }
BuildResult buildDerivation(const Path & drvPath, const BasicDerivation & drv,
BuildMode buildMode) override
{
auto conn(connections->get());
conn->to
<< cmdBuildDerivation
<< drvPath
<< drv
<< settings.maxSilentTime
<< settings.buildTimeout;
if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 2)
conn->to
<< settings.maxLogSize;
if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 3)
conn->to
<< settings.buildRepeat
<< settings.enforceDeterminism;
conn->to.flush();
BuildResult status;
status.status = (BuildResult::Status) readInt(conn->from);
conn->from >> status.errorMsg;
if (GET_PROTOCOL_MINOR(conn->remoteVersion) >= 3)
conn->from >> status.timesBuilt >> status.isNonDeterministic >> status.startTime >> status.stopTime;
return status;
}
void ensurePath(const Path & path) override
{ unsupported(); }
void addTempRoot(const Path & path) override
{ unsupported(); }
void addIndirectRoot(const Path & path) override
{ unsupported(); }
Roots findRoots() override
{ unsupported(); }
void collectGarbage(const GCOptions & options, GCResults & results) override
{ unsupported(); }
ref<FSAccessor> getFSAccessor() override
{ unsupported(); }
void addSignatures(const Path & storePath, const StringSet & sigs) override
{ unsupported(); }
void computeFSClosure(const PathSet & paths,
PathSet & out, bool flipDirection = false,
bool includeOutputs = false, bool includeDerivers = false) override
{
if (flipDirection || includeDerivers) {
Store::computeFSClosure(paths, out, flipDirection, includeOutputs, includeDerivers);
return;
}
auto conn(connections->get());
conn->to
<< cmdQueryClosure
<< includeOutputs
<< paths;
conn->to.flush();
auto res = readStorePaths<PathSet>(*this, conn->from);
out.insert(res.begin(), res.end());
}
PathSet queryValidPaths(const PathSet & paths,
SubstituteFlag maybeSubstitute = NoSubstitute) override
{
auto conn(connections->get());
conn->to
<< cmdQueryValidPaths
<< false // lock
<< maybeSubstitute
<< paths;
conn->to.flush();
return readStorePaths<PathSet>(*this, conn->from);
}
void connect() override
{
auto conn(connections->get());
}
};
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<LegacySSHStore>(std::string(uri, uriScheme.size()), params);
});
}