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).
101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
#include "store-api.hh"
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#include "remote-store.hh"
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#include "remote-fs-accessor.hh"
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#include "archive.hh"
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#include "worker-protocol.hh"
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#include "pool.hh"
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#include "ssh.hh"
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namespace nix {
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static std::string uriScheme = "ssh-ng://";
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class SSHStore : public RemoteStore
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{
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public:
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const Setting<Path> sshKey{(Store*) this, "", "ssh-key", "path to an SSH private key"};
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const Setting<bool> compress{(Store*) this, false, "compress", "whether to compress the connection"};
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SSHStore(const std::string & host, const Params & params)
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: Store(params)
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, RemoteStore(params)
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, host(host)
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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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{
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}
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std::string getUri() override
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{
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return uriScheme + host;
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}
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bool sameMachine() override
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{ return false; }
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void narFromPath(const StorePath & path, Sink & sink) override;
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ref<FSAccessor> getFSAccessor() override;
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private:
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struct Connection : RemoteStore::Connection
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{
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std::unique_ptr<SSHMaster::Connection> sshConn;
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};
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ref<RemoteStore::Connection> openConnection() override;
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std::string host;
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SSHMaster master;
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void setOptions(RemoteStore::Connection & conn) override
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{
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/* TODO Add a way to explicitly ask for some options to be
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forwarded. One option: A way to query the daemon for its
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settings, and then a series of params to SSHStore like
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forward-cores or forward-overridden-cores that only
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override the requested settings.
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*/
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};
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};
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void SSHStore::narFromPath(const StorePath & path, Sink & sink)
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{
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auto conn(connections->get());
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conn->to << wopNarFromPath << printStorePath(path);
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conn->processStderr();
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copyNAR(conn->from, sink);
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}
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ref<FSAccessor> SSHStore::getFSAccessor()
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{
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return make_ref<RemoteFSAccessor>(ref<Store>(shared_from_this()));
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}
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ref<RemoteStore::Connection> SSHStore::openConnection()
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{
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auto conn = make_ref<Connection>();
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conn->sshConn = master.startCommand("nix-daemon --stdio");
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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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initConnection(*conn);
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return conn;
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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<SSHStore>(std::string(uri, uriScheme.size()), params);
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});
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}
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