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https://github.com/privatevoid-net/nix-super.git
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8614cf1334
The garbage collector no longer blocks other processes from adding/building store paths or adding GC roots. To prevent the collector from deleting store paths just added by another process, processes need to connect to the garbage collector via a Unix domain socket to register new temporary roots.
75 lines
1.4 KiB
C++
75 lines
1.4 KiB
C++
#include "uds-remote-store.hh"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <cstring>
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namespace nix {
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UDSRemoteStore::UDSRemoteStore(const Params & params)
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: StoreConfig(params)
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, LocalFSStoreConfig(params)
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, RemoteStoreConfig(params)
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, UDSRemoteStoreConfig(params)
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, Store(params)
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, LocalFSStore(params)
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, RemoteStore(params)
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{
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}
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UDSRemoteStore::UDSRemoteStore(
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const std::string scheme,
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std::string socket_path,
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const Params & params)
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: UDSRemoteStore(params)
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{
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path.emplace(socket_path);
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}
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std::string UDSRemoteStore::getUri()
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{
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if (path) {
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return std::string("unix://") + *path;
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} else {
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return "daemon";
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}
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}
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void UDSRemoteStore::Connection::closeWrite()
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{
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shutdown(fd.get(), SHUT_WR);
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}
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ref<RemoteStore::Connection> UDSRemoteStore::openConnection()
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{
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auto conn = make_ref<Connection>();
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/* Connect to a daemon that does the privileged work for us. */
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conn->fd = createUnixDomainSocket();
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nix::connect(conn->fd.get(), path ? *path : settings.nixDaemonSocketFile);
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conn->from.fd = conn->fd.get();
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conn->to.fd = conn->fd.get();
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conn->startTime = std::chrono::steady_clock::now();
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return conn;
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}
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static RegisterStoreImplementation<UDSRemoteStore, UDSRemoteStoreConfig> regUDSRemoteStore;
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}
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