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#include "archive.hh"
#include "pool.hh"
#include "remote-store.hh"
#include "serve-protocol.hh"
#include "store-api.hh"
#include "worker-protocol.hh"
namespace nix {
static std::string uriScheme = "legacy-ssh://";
struct LegacySSHStore : public Store
{
string host;
struct Connection
{
Pid sshPid;
AutoCloseFD out;
AutoCloseFD in;
FdSink to;
FdSource from;
};
AutoDelete tmpDir;
Path socketPath;
Pid sshMaster;
ref<Pool<Connection>> connections;
Path key;
LegacySSHStore(const string & host, const Params & params,
size_t maxConnections = std::numeric_limits<size_t>::max())
: Store(params)
, host(host)
, tmpDir(createTempDir("", "nix", true, true, 0700))
, socketPath((Path) tmpDir + "/ssh.sock")
, connections(make_ref<Pool<Connection>>(
maxConnections,
[this]() { return openConnection(); },
[](const ref<Connection> & r) { return true; }
))
, key(get(params, "ssh-key", ""))
{
}
ref<Connection> openConnection()
{
if ((pid_t) sshMaster == -1) {
sshMaster = startProcess([&]() {
restoreSignals();
Strings args{ "ssh", "-M", "-S", socketPath, "-N", "-x", "-a", host };
if (!key.empty())
args.insert(args.end(), {"-i", key});
execvp("ssh", stringsToCharPtrs(args).data());
throw SysError("starting SSH master connection to host ‘%s’", host);
});
}
auto conn = make_ref<Connection>();
Pipe in, out;
in.create();
out.create();
conn->sshPid = startProcess([&]() {
if (dup2(in.readSide.get(), STDIN_FILENO) == -1)
throw SysError("duping over STDIN");
if (dup2(out.writeSide.get(), STDOUT_FILENO) == -1)
throw SysError("duping over STDOUT");
execlp("ssh", "ssh", "-S", socketPath.c_str(), host.c_str(), "nix-store", "--serve", "--write", nullptr);
throw SysError("executing ‘nix-store --serve’ on remote host ‘%s’", host);
});
in.readSide = -1;
out.writeSide = -1;
conn->out = std::move(out.readSide);
conn->in = std::move(in.writeSide);
conn->to = FdSink(conn->in.get());
conn->from = FdSource(conn->out.get());
int remoteVersion;
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);
remoteVersion = readInt(conn->from);
if (GET_PROTOCOL_MAJOR(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,
bool repair, bool dontCheckSigs,
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 */
SavingSourceAdapter savedNAR(conn->from);
parseDump(parseSink, savedNAR);
sink(savedNAR.s);
}
/* Unsupported methods. */
[[noreturn]] void unsupported()
{
throw Error("operation not supported on SSH stores");
}
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, bool repair) override
{ unsupported(); }
Path addTextToStore(const string & name, const string & s,
const PathSet & references, bool repair) override
{ unsupported(); }
void buildPaths(const PathSet & paths, BuildMode buildMode) override
{ unsupported(); }
BuildResult buildDerivation(const Path & drvPath, const BasicDerivation & drv,
BuildMode buildMode) override
{ unsupported(); }
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(); }
bool isTrusted() override
{ return true; }
};
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);
});
}
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