307 lines
10 KiB
C++
307 lines
10 KiB
C++
#include <cstdlib>
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#include <cstring>
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#include <algorithm>
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#include <set>
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#include <memory>
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#include <tuple>
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#include <iomanip>
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#if __APPLE__
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#include <sys/time.h>
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#endif
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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 "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::cin;
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static void handleAlarm(int sig) {
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}
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class Machine {
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const std::set<string> supportedFeatures;
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const std::set<string> mandatoryFeatures;
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public:
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const string storeUri;
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const std::vector<string> systemTypes;
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const string sshKey;
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const unsigned int maxJobs;
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const unsigned int speedFactor;
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bool enabled = true;
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bool allSupported(const std::set<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 supportedFeatures.count(feature) ||
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mandatoryFeatures.count(feature);
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});
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}
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bool mandatoryMet(const std::set<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 features.count(feature);
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});
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}
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Machine(decltype(storeUri) storeUri,
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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(supportedFeatures),
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mandatoryFeatures(mandatoryFeatures),
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storeUri(
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// Backwards compatibility: if the URI is a hostname,
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// prepend ssh://.
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storeUri.find("://") != std::string::npos || hasPrefix(storeUri, "local") || hasPrefix(storeUri, "remote") || hasPrefix(storeUri, "auto")
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? storeUri
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: "ssh://" + storeUri),
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systemTypes(systemTypes),
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sshKey(sshKey),
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maxJobs(maxJobs),
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speedFactor(std::max(1U, speedFactor))
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{}
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};
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static std::vector<Machine> readConf()
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{
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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 lines = std::vector<string>{};
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try {
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lines = tokenizeString<std::vector<string>>(readFile(conf), "\n");
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} catch (const SysError & e) {
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if (e.errNo != ENOENT)
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throw;
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}
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for (auto line : lines) {
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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 < 1)
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throw FormatError("bad machines.conf file ‘%1%’", conf);
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machines.emplace_back(tokens[0],
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sz >= 2 ? tokenizeString<std::vector<string>>(tokens[1], ",") : std::vector<string>{settings.thisSystem},
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sz >= 3 ? tokens[2] : "",
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sz >= 4 ? std::stoull(tokens[3]) : 1LL,
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sz >= 5 ? std::stoull(tokens[4]) : 1LL,
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sz >= 6 ?
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tokenizeString<std::set<string>>(tokens[5], ",") :
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std::set<string>{},
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sz >= 7 ?
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tokenizeString<std::set<string>>(tokens[6], ",") :
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std::set<string>{});
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}
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return machines;
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}
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std::string escapeUri(std::string uri)
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{
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std::replace(uri.begin(), uri.end(), '/', '_');
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return uri;
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}
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static string currentLoad;
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static AutoCloseFD openSlotLock(const Machine & m, unsigned long long slot)
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{
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return openLockFile(fmt("%s/%s-%d", currentLoad, escapeUri(m.storeUri), slot), true);
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}
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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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unsetenv("DISPLAY");
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unsetenv("SSH_ASKPASS");
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if (argc != 5)
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throw UsageError("called without required arguments");
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auto store = openStore();
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auto localSystem = argv[1];
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settings.maxSilentTime = std::stoll(argv[2]);
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settings.buildTimeout = std::stoll(argv[3]);
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verbosity = (Verbosity) std::stoll(argv[4]);
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/* It would be more appropriate to use $XDG_RUNTIME_DIR, since
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that gets cleared on reboot, but it wouldn't work on OS X. */
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currentLoad = settings.nixStateDir + "/current-load";
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std::shared_ptr<Store> sshStore;
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AutoCloseFD bestSlotLock;
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auto machines = readConf();
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debug("got %d remote builders", machines.size());
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if (machines.empty()) {
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std::cerr << "# decline-permanently\n";
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return;
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}
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string drvPath;
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string storeUri;
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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("invalid build hook line ‘%1%’", line);
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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::set<string>{} :
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tokenizeString<std::set<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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debug("considering building on ‘%s’", m.storeUri);
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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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auto 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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std::cerr << "# postpone\n";
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else
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std::cerr << "# decline\n";
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break;
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}
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#if __APPLE__
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futimes(bestSlotLock.get(), NULL);
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#else
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futimens(bestSlotLock.get(), NULL);
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#endif
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lock = -1;
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try {
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Store::Params storeParams{{"max-connections", "1"}, {"log-fd", "4"}};
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if (bestMachine->sshKey != "")
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storeParams["ssh-key"] = bestMachine->sshKey;
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sshStore = openStore(bestMachine->storeUri, storeParams);
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storeUri = bestMachine->storeUri;
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} catch (std::exception & e) {
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printError("unable to open SSH connection to ‘%s’: %s; trying other available machines...",
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bestMachine->storeUri, e.what());
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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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std::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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auto inputs = tokenizeString<PathSet>(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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auto outputs = tokenizeString<PathSet>(line);
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AutoCloseFD uploadLock = openLockFile(currentLoad + "/" + escapeUri(storeUri) + ".upload-lock", true);
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auto old = signal(SIGALRM, handleAlarm);
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alarm(15 * 60);
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if (!lockFile(uploadLock.get(), ltWrite, true))
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printError("somebody is hogging the upload lock for ‘%s’, continuing...");
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alarm(0);
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signal(SIGALRM, old);
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copyPaths(store, ref<Store>(sshStore), inputs, false, true);
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uploadLock = -1;
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BasicDerivation drv(readDerivation(drvPath));
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drv.inputSrcs = inputs;
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printError("building ‘%s’ on ‘%s’", drvPath, storeUri);
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sshStore->buildDerivation(drvPath, drv);
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PathSet missing;
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for (auto & path : outputs)
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if (!store->isValidPath(path)) missing.insert(path);
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if (!missing.empty()) {
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setenv("NIX_HELD_LOCKS", concatStringsSep(" ", missing).c_str(), 1); /* FIXME: ugly */
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copyPaths(ref<Store>(sshStore), store, missing, false, true);
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}
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return;
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});
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}
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