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https://github.com/NixOS/nix
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build-remote: Implement in C++
This commit is contained in:
Shea Levy
parent
2af5d35fdc
commit
167d12b02c
12 changed files with 338 additions and 30 deletions
280
src/build-remote/build-remote.cc
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280
src/build-remote/build-remote.cc
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#include <cstdlib>
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#include <cstring>
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#include <algorithm>
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#include <fstream>
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#include <sstream>
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#include <vector>
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#include <memory>
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#include <tuple>
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#include <iomanip>
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#include "shared.hh"
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#include "pathlocks.hh"
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#include "globals.hh"
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#include "serve-protocol.hh"
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#include "serialise.hh"
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#include "store-api.hh"
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#include "derivations.hh"
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using namespace nix;
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using std::cerr;
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using std::cin;
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static void handle_alarm(int sig) {
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}
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class machine {
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const std::vector<string> supportedFeatures;
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const std::vector<string> mandatoryFeatures;
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public:
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const string hostName;
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const std::vector<string> systemTypes;
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const string sshKey;
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const unsigned long long maxJobs;
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const unsigned long long speedFactor;
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bool enabled;
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bool allSupported(const std::vector<string> & features) const {
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return std::all_of(features.begin(), features.end(),
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[&](const string & feature) {
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return std::find(supportedFeatures.begin(),
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supportedFeatures.end(),
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feature) != supportedFeatures.end() ||
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std::find(mandatoryFeatures.begin(),
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mandatoryFeatures.end(),
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feature) != mandatoryFeatures.end();
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});
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}
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bool mandatoryMet(const std::vector<string> & features) const {
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return std::all_of(mandatoryFeatures.begin(), mandatoryFeatures.end(),
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[&](const string & feature) {
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return std::find(features.begin(), features.end(), feature) != features.end();
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});
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}
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machine(decltype(hostName) hostName,
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decltype(systemTypes) systemTypes,
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decltype(sshKey) sshKey,
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decltype(maxJobs) maxJobs,
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decltype(speedFactor) speedFactor,
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decltype(supportedFeatures) supportedFeatures,
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decltype(mandatoryFeatures) mandatoryFeatures) :
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supportedFeatures{std::move(supportedFeatures)},
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mandatoryFeatures{std::move(mandatoryFeatures)},
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hostName{std::move(hostName)},
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systemTypes{std::move(systemTypes)},
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sshKey{std::move(sshKey)},
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maxJobs{std::move(maxJobs)},
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speedFactor{speedFactor == 0 ? 1 : std::move(speedFactor)},
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enabled{true} {};
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};;
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static std::vector<machine> read_conf() {
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auto conf = getEnv("NIX_REMOTE_SYSTEMS", SYSCONFDIR "/nix/machines");
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auto machines = std::vector<machine>{};
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auto confFile = std::ifstream{conf};
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if (confFile.good()) {
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confFile.exceptions(std::ifstream::badbit);
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for (string line; getline(confFile, line);) {
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chomp(line);
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line.erase(std::find(line.begin(), line.end(), '#'), line.end());
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if (line.empty()) {
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continue;
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}
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auto tokens = tokenizeString<std::vector<string>>(line);
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auto sz = tokens.size();
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if (sz < 4) {
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throw new FormatError(format("Bad machines.conf file %1%")
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% conf);
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}
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machines.emplace_back(tokens[0],
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tokenizeString<std::vector<string>>(tokens[1], ","),
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tokens[2],
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stoull(tokens[3]),
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sz >= 5 ? stoull(tokens[4]) : 1LL,
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sz >= 6 ?
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tokenizeString<std::vector<string>>(tokens[5], ",") :
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std::vector<string>{},
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sz >= 7 ?
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tokenizeString<std::vector<string>>(tokens[6], ",") :
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std::vector<string>{});
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}
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}
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confFile.close();
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return machines;
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}
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static string currentLoad;
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static int openSlotLock(const machine & m, unsigned long long slot) {
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auto fn_stream = std::stringstream(currentLoad, std::ios_base::ate | std::ios_base::out);
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fn_stream << "/";
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for (auto t : m.systemTypes) {
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fn_stream << t << "-";
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}
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fn_stream << m.hostName << "-" << slot;
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return openLockFile(fn_stream.str(), true);
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}
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static char display_env[] = "DISPLAY=";
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static char ssh_env[] = "SSH_ASKPASS=";
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int main (int argc, char * * argv)
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{
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return handleExceptions(argv[0], [&]() {
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initNix();
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/* Ensure we don't get any SSH passphrase or host key popups. */
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if (putenv(display_env) == -1 ||
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putenv(ssh_env) == -1) {
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throw SysError("Setting SSH env vars");
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}
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if (argc != 4) {
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throw UsageError("called without required arguments");
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}
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auto store = openStore();
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auto localSystem = argv[1];
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settings.maxSilentTime = strtoull(argv[2], NULL, 10);
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settings.buildTimeout = strtoull(argv[3], NULL, 10);
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currentLoad = getEnv("NIX_CURRENT_LOAD", "/run/nix/current-load");
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std::shared_ptr<Store> sshStore;
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AutoCloseFD bestSlotLock;
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auto machines = read_conf();
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string drvPath;
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string hostName;
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for (string line; getline(cin, line);) {
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auto tokens = tokenizeString<std::vector<string>>(line);
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auto sz = tokens.size();
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if (sz != 3 && sz != 4) {
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throw Error(format("invalid build hook line %1%") % line);
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}
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auto amWilling = tokens[0] == "1";
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auto neededSystem = tokens[1];
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drvPath = tokens[2];
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auto requiredFeatures = sz == 3 ?
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std::vector<string>{} :
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tokenizeString<std::vector<string>>(tokens[3], ",");
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auto canBuildLocally = amWilling && (neededSystem == localSystem);
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/* Error ignored here, will be caught later */
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mkdir(currentLoad.c_str(), 0777);
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while (true) {
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bestSlotLock = -1;
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AutoCloseFD lock = openLockFile(currentLoad + "/main-lock", true);
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lockFile(lock.get(), ltWrite, true);
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bool rightType = false;
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machine * bestMachine = nullptr;
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unsigned long long bestLoad = 0;
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for (auto & m : machines) {
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if (m.enabled && std::find(m.systemTypes.begin(),
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m.systemTypes.end(),
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neededSystem) != m.systemTypes.end() &&
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m.allSupported(requiredFeatures) &&
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m.mandatoryMet(requiredFeatures)) {
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rightType = true;
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AutoCloseFD free;
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unsigned long long load = 0;
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for (unsigned long long slot = 0; slot < m.maxJobs; ++slot) {
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AutoCloseFD slotLock = openSlotLock(m, slot);
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if (lockFile(slotLock.get(), ltWrite, false)) {
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if (!free) {
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free = std::move(slotLock);
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}
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} else {
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++load;
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}
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}
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if (!free) {
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continue;
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}
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bool best = false;
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if (!bestSlotLock) {
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best = true;
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} else if (load / m.speedFactor < bestLoad / bestMachine->speedFactor) {
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best = true;
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} else if (load / m.speedFactor == bestLoad / bestMachine->speedFactor) {
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if (m.speedFactor > bestMachine->speedFactor) {
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best = true;
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} else if (m.speedFactor == bestMachine->speedFactor) {
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if (load < bestLoad) {
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best = true;
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}
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}
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}
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if (best) {
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bestLoad = load;
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bestSlotLock = std::move(free);
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bestMachine = &m;
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}
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}
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}
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if (!bestSlotLock) {
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if (rightType && !canBuildLocally) {
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cerr << "# postpone\n";
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} else {
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cerr << "# decline\n";
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}
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break;
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}
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futimens(bestSlotLock.get(), NULL);
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lock = -1;
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try {
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sshStore = openStore("ssh://" + bestMachine->hostName + "?key=" + bestMachine->sshKey);
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hostName = bestMachine->hostName;
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} catch (std::exception & e) {
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cerr << e.what() << '\n';
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cerr << "unable to open SSH connection to ‘" << bestMachine->hostName << "’, trying other available machines...\n";
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bestMachine->enabled = false;
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continue;
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}
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goto connected;
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}
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}
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connected:
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cerr << "# accept\n";
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string line;
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if (!getline(cin, line)) {
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throw Error("hook caller didn't send inputs");
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}
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auto inputs = tokenizeString<std::list<string>>(line);
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if (!getline(cin, line)) {
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throw Error("hook caller didn't send outputs");
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}
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auto outputs = tokenizeString<Strings>(line);
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AutoCloseFD uploadLock = openLockFile(currentLoad + "/" + hostName + ".upload-lock", true);
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auto old = signal(SIGALRM, handle_alarm);
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alarm(15 * 60);
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if (!lockFile(uploadLock.get(), ltWrite, true)) {
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cerr << "somebody is hogging the upload lock for " << hostName << ", continuing...\n";
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}
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alarm(0);
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signal(SIGALRM, old);
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copyPaths(store, ref<Store>(sshStore), inputs);
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uploadLock = -1;
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cerr << "building ‘" << drvPath << "’ on ‘" << hostName << "’\n";
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sshStore->buildDerivation(drvPath, readDerivation(drvPath));
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std::remove_if(outputs.begin(), outputs.end(), [=](const Path & path) { return store->isValidPath(path); });
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if (!outputs.empty()) {
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setenv("NIX_HELD_LOCKS", concatStringsSep(" ", outputs).c_str(), 1); /* FIXME: ugly */
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copyPaths(ref<Store>(sshStore), store, outputs);
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}
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return;
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});
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}
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11
src/build-remote/local.mk
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11
src/build-remote/local.mk
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@ -0,0 +1,11 @@
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programs += build-remote
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build-remote_DIR := $(d)
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build-remote_INSTALL_DIR := $(libexecdir)/nix
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build-remote_LIBS = libmain libutil libformat libstore
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build-remote_SOURCES := $(d)/build-remote.cc
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build-remote_CXXFLAGS = -DSYSCONFDIR="\"$(sysconfdir)\"" -Isrc/nix-store
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