forked from lix-project/lix
433 lines
10 KiB
C++
433 lines
10 KiB
C++
#include "serialise.hh"
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#include "util.hh"
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#include "remote-store.hh"
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#include "worker-protocol.hh"
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#include "archive.hh"
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#include "globals.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 <fcntl.h>
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#include <iostream>
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#include <unistd.h>
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namespace nix {
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Path readStorePath(Source & from)
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{
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Path path = readString(from);
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assertStorePath(path);
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return path;
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}
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PathSet readStorePaths(Source & from)
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{
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PathSet paths = readStringSet(from);
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for (PathSet::iterator i = paths.begin(); i != paths.end(); ++i)
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assertStorePath(*i);
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return paths;
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}
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RemoteStore::RemoteStore()
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{
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string remoteMode = getEnv("NIX_REMOTE");
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if (remoteMode == "slave")
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/* Fork off a setuid worker to do the privileged work. */
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forkSlave();
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else if (remoteMode == "daemon")
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/* Connect to a daemon that does the privileged work for
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us. */
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connectToDaemon();
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else
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throw Error(format("invalid setting for NIX_REMOTE, `%1%'")
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% remoteMode);
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from.fd = fdSocket;
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to.fd = fdSocket;
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/* Send the magic greeting, check for the reply. */
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try {
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writeInt(WORKER_MAGIC_1, to);
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unsigned int magic = readInt(from);
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if (magic != WORKER_MAGIC_2) throw Error("protocol mismatch");
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daemonVersion = readInt(from);
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if (GET_PROTOCOL_MAJOR(daemonVersion) != GET_PROTOCOL_MAJOR(PROTOCOL_VERSION))
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throw Error("Nix daemon protocol version not supported");
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writeInt(PROTOCOL_VERSION, to);
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processStderr();
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} catch (Error & e) {
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throw Error(format("cannot start worker (%1%)")
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% e.msg());
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}
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setOptions();
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}
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void RemoteStore::forkSlave()
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{
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int sockets[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) == -1)
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throw SysError("cannot create sockets");
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fdSocket = sockets[0];
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AutoCloseFD fdChild = sockets[1];
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/* Start the worker. */
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Path worker = getEnv("NIX_WORKER");
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if (worker == "")
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worker = nixBinDir + "/nix-worker";
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string verbosityArg = "-";
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for (int i = 1; i < verbosity; ++i)
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verbosityArg += "v";
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child = fork();
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switch (child) {
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case -1:
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throw SysError("unable to fork");
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case 0:
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try { /* child */
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if (dup2(fdChild, STDOUT_FILENO) == -1)
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throw SysError("dupping write side");
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if (dup2(fdChild, STDIN_FILENO) == -1)
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throw SysError("dupping read side");
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close(fdSocket);
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close(fdChild);
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execlp(worker.c_str(), worker.c_str(), "--slave",
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/* hacky - must be at the end */
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verbosityArg == "-" ? NULL : verbosityArg.c_str(),
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NULL);
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throw SysError(format("executing `%1%'") % worker);
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} catch (std::exception & e) {
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std::cerr << format("child error: %1%\n") % e.what();
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}
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quickExit(1);
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}
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fdChild.close();
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}
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void RemoteStore::connectToDaemon()
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{
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fdSocket = socket(PF_UNIX, SOCK_STREAM, 0);
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if (fdSocket == -1)
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throw SysError("cannot create Unix domain socket");
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string socketPath = nixStateDir + DEFAULT_SOCKET_PATH;
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/* Urgh, sockaddr_un allows path names of only 108 characters. So
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chdir to the socket directory so that we can pass a relative
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path name. !!! this is probably a bad idea in multi-threaded
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applications... */
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AutoCloseFD fdPrevDir = open(".", O_RDONLY);
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if (fdPrevDir == -1) throw SysError("couldn't open current directory");
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chdir(dirOf(socketPath).c_str());
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Path socketPathRel = "./" + baseNameOf(socketPath);
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struct sockaddr_un addr;
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addr.sun_family = AF_UNIX;
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if (socketPathRel.size() >= sizeof(addr.sun_path))
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throw Error(format("socket path `%1%' is too long") % socketPathRel);
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strcpy(addr.sun_path, socketPathRel.c_str());
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if (connect(fdSocket, (struct sockaddr *) &addr, sizeof(addr)) == -1)
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throw SysError(format("cannot connect to daemon at `%1%'") % socketPath);
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if (fchdir(fdPrevDir) == -1)
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throw SysError("couldn't change back to previous directory");
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}
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RemoteStore::~RemoteStore()
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{
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try {
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fdSocket.close();
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if (child != -1)
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child.wait(true);
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} catch (...) {
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ignoreException();
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}
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}
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void RemoteStore::setOptions()
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{
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writeInt(wopSetOptions, to);
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writeInt(keepFailed, to);
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writeInt(keepGoing, to);
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writeInt(tryFallback, to);
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writeInt(verbosity, to);
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writeInt(maxBuildJobs, to);
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writeInt(maxSilentTime, to);
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if (GET_PROTOCOL_MINOR(daemonVersion) >= 2)
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writeInt(useBuildHook, to);
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processStderr();
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}
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bool RemoteStore::isValidPath(const Path & path)
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{
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writeInt(wopIsValidPath, to);
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writeString(path, to);
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processStderr();
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unsigned int reply = readInt(from);
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return reply != 0;
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}
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PathSet RemoteStore::queryValidPaths()
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{
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throw Error("not implemented");
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}
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bool RemoteStore::hasSubstitutes(const Path & path)
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{
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writeInt(wopHasSubstitutes, to);
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writeString(path, to);
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processStderr();
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unsigned int reply = readInt(from);
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return reply != 0;
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}
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bool RemoteStore::querySubstitutablePathInfo(const Path & path,
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SubstitutablePathInfo & info)
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{
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writeInt(wopQuerySubstitutablePathInfo, to);
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writeString(path, to);
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processStderr();
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unsigned int reply = readInt(from);
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if (reply == 0) return false;
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info.deriver = readString(from);
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if (info.deriver != "") assertStorePath(info.deriver);
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info.references = readStorePaths(from);
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info.downloadSize = readLongLong(from);
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return true;
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}
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Hash RemoteStore::queryPathHash(const Path & path)
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{
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writeInt(wopQueryPathHash, to);
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writeString(path, to);
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processStderr();
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string hash = readString(from);
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return parseHash(htSHA256, hash);
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}
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void RemoteStore::queryReferences(const Path & path,
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PathSet & references)
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{
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writeInt(wopQueryReferences, to);
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writeString(path, to);
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processStderr();
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PathSet references2 = readStorePaths(from);
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references.insert(references2.begin(), references2.end());
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}
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void RemoteStore::queryReferrers(const Path & path,
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PathSet & referrers)
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{
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writeInt(wopQueryReferrers, to);
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writeString(path, to);
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processStderr();
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PathSet referrers2 = readStorePaths(from);
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referrers.insert(referrers2.begin(), referrers2.end());
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}
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Path RemoteStore::queryDeriver(const Path & path)
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{
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writeInt(wopQueryDeriver, to);
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writeString(path, to);
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processStderr();
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Path drvPath = readString(from);
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if (drvPath != "") assertStorePath(drvPath);
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return drvPath;
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}
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Path RemoteStore::addToStore(const Path & _srcPath, bool fixed,
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bool recursive, string hashAlgo, PathFilter & filter)
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{
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Path srcPath(absPath(_srcPath));
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writeInt(wopAddToStore, to);
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writeString(baseNameOf(srcPath), to);
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writeInt(fixed ? 1 : 0, to);
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writeInt(recursive ? 1 : 0, to);
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writeString(hashAlgo, to);
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dumpPath(srcPath, to, filter);
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processStderr();
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return readStorePath(from);
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}
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Path RemoteStore::addTextToStore(const string & suffix, const string & s,
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const PathSet & references)
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{
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writeInt(wopAddTextToStore, to);
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writeString(suffix, to);
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writeString(s, to);
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writeStringSet(references, to);
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processStderr();
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return readStorePath(from);
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}
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void RemoteStore::exportPath(const Path & path, bool sign,
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Sink & sink)
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{
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writeInt(wopExportPath, to);
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writeString(path, to);
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writeInt(sign ? 1 : 0, to);
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processStderr(&sink); /* sink receives the actual data */
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readInt(from);
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}
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Path RemoteStore::importPath(bool requireSignature, Source & source)
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{
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writeInt(wopImportPath, to);
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/* We ignore requireSignature, since the worker forces it to true
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anyway. */
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processStderr(0, &source);
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return readStorePath(from);
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}
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void RemoteStore::buildDerivations(const PathSet & drvPaths)
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{
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writeInt(wopBuildDerivations, to);
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writeStringSet(drvPaths, to);
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processStderr();
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readInt(from);
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}
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void RemoteStore::ensurePath(const Path & path)
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{
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writeInt(wopEnsurePath, to);
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writeString(path, to);
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processStderr();
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readInt(from);
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}
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void RemoteStore::addTempRoot(const Path & path)
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{
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writeInt(wopAddTempRoot, to);
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writeString(path, to);
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processStderr();
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readInt(from);
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}
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void RemoteStore::addIndirectRoot(const Path & path)
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{
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writeInt(wopAddIndirectRoot, to);
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writeString(path, to);
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processStderr();
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readInt(from);
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}
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void RemoteStore::syncWithGC()
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{
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writeInt(wopSyncWithGC, to);
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processStderr();
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readInt(from);
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}
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Roots RemoteStore::findRoots()
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{
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writeInt(wopFindRoots, to);
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processStderr();
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unsigned int count = readInt(from);
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Roots result;
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while (count--) {
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Path link = readString(from);
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Path target = readStorePath(from);
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result[link] = target;
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}
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return result;
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}
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void RemoteStore::collectGarbage(const GCOptions & options, GCResults & results)
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{
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writeInt(wopCollectGarbage, to);
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writeInt(options.action, to);
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writeStringSet(options.pathsToDelete, to);
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writeInt(options.ignoreLiveness, to);
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writeLongLong(options.maxFreed, to);
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writeInt(options.maxLinks, to);
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processStderr();
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results.paths = readStringSet(from);
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results.bytesFreed = readLongLong(from);
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results.blocksFreed = readLongLong(from);
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}
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void RemoteStore::processStderr(Sink * sink, Source * source)
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{
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unsigned int msg;
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while ((msg = readInt(from)) == STDERR_NEXT
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|| msg == STDERR_READ || msg == STDERR_WRITE) {
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if (msg == STDERR_WRITE) {
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string s = readString(from);
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if (!sink) throw Error("no sink");
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(*sink)((const unsigned char *) s.c_str(), s.size());
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}
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else if (msg == STDERR_READ) {
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if (!source) throw Error("no source");
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unsigned int len = readInt(from);
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unsigned char * buf = new unsigned char[len];
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AutoDeleteArray<unsigned char> d(buf);
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(*source)(buf, len);
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writeString(string((const char *) buf, len), to);
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}
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else {
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string s = readString(from);
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writeToStderr((const unsigned char *) s.c_str(), s.size());
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}
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}
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if (msg == STDERR_ERROR)
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throw Error(readString(from));
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else if (msg != STDERR_LAST)
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throw Error("protocol error processing standard error");
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}
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}
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