276 lines
9.7 KiB
C++
276 lines
9.7 KiB
C++
#include <cstdlib>
|
||
#include <cstring>
|
||
#include <algorithm>
|
||
#include <set>
|
||
#include <memory>
|
||
#include <tuple>
|
||
#include <iomanip>
|
||
|
||
#include "shared.hh"
|
||
#include "pathlocks.hh"
|
||
#include "globals.hh"
|
||
#include "serialise.hh"
|
||
#include "store-api.hh"
|
||
#include "derivations.hh"
|
||
|
||
using namespace nix;
|
||
using std::cerr;
|
||
using std::cin;
|
||
|
||
static void handle_alarm(int sig) {
|
||
}
|
||
|
||
class machine {
|
||
const std::set<string> supportedFeatures;
|
||
const std::set<string> mandatoryFeatures;
|
||
|
||
public:
|
||
const string hostName;
|
||
const std::vector<string> systemTypes;
|
||
const string sshKey;
|
||
const unsigned long long maxJobs;
|
||
const unsigned long long speedFactor;
|
||
bool enabled;
|
||
|
||
bool allSupported(const std::set<string> & features) const {
|
||
return std::all_of(features.begin(), features.end(),
|
||
[&](const string & feature) {
|
||
return supportedFeatures.count(feature) ||
|
||
mandatoryFeatures.count(feature);
|
||
});
|
||
}
|
||
|
||
bool mandatoryMet(const std::set<string> & features) const {
|
||
return std::all_of(mandatoryFeatures.begin(), mandatoryFeatures.end(),
|
||
[&](const string & feature) {
|
||
return features.count(feature);
|
||
});
|
||
}
|
||
|
||
machine(decltype(hostName) hostName,
|
||
decltype(systemTypes) systemTypes,
|
||
decltype(sshKey) sshKey,
|
||
decltype(maxJobs) maxJobs,
|
||
decltype(speedFactor) speedFactor,
|
||
decltype(supportedFeatures) supportedFeatures,
|
||
decltype(mandatoryFeatures) mandatoryFeatures) :
|
||
supportedFeatures{std::move(supportedFeatures)},
|
||
mandatoryFeatures{std::move(mandatoryFeatures)},
|
||
hostName{std::move(hostName)},
|
||
systemTypes{std::move(systemTypes)},
|
||
sshKey{std::move(sshKey)},
|
||
maxJobs{std::move(maxJobs)},
|
||
speedFactor{speedFactor == 0 ? 1 : std::move(speedFactor)},
|
||
enabled{true} {};
|
||
};;
|
||
|
||
static std::vector<machine> read_conf() {
|
||
auto conf = getEnv("NIX_REMOTE_SYSTEMS", SYSCONFDIR "/nix/machines");
|
||
|
||
auto machines = std::vector<machine>{};
|
||
auto lines = std::vector<string>{};
|
||
try {
|
||
lines = tokenizeString<std::vector<string>>(readFile(conf), "\n");
|
||
} catch (const SysError & e) {
|
||
if (e.errNo != ENOENT)
|
||
throw;
|
||
}
|
||
for (auto line : lines) {
|
||
chomp(line);
|
||
line.erase(std::find(line.begin(), line.end(), '#'), line.end());
|
||
if (line.empty()) {
|
||
continue;
|
||
}
|
||
auto tokens = tokenizeString<std::vector<string>>(line);
|
||
auto sz = tokens.size();
|
||
if (sz < 4) {
|
||
throw new FormatError(format("Bad machines.conf file %1%")
|
||
% conf);
|
||
}
|
||
machines.emplace_back(tokens[0],
|
||
tokenizeString<std::vector<string>>(tokens[1], ","),
|
||
tokens[2],
|
||
stoull(tokens[3]),
|
||
sz >= 5 ? stoull(tokens[4]) : 1LL,
|
||
sz >= 6 ?
|
||
tokenizeString<std::set<string>>(tokens[5], ",") :
|
||
std::set<string>{},
|
||
sz >= 7 ?
|
||
tokenizeString<std::set<string>>(tokens[6], ",") :
|
||
std::set<string>{});
|
||
}
|
||
return machines;
|
||
}
|
||
|
||
static string currentLoad;
|
||
|
||
static int openSlotLock(const machine & m, unsigned long long slot) {
|
||
auto fn_stream = std::stringstream(currentLoad, std::ios_base::ate | std::ios_base::out);
|
||
fn_stream << "/";
|
||
for (auto t : m.systemTypes) {
|
||
fn_stream << t << "-";
|
||
}
|
||
fn_stream << m.hostName << "-" << slot;
|
||
return openLockFile(fn_stream.str(), true);
|
||
}
|
||
|
||
static char display_env[] = "DISPLAY=";
|
||
static char ssh_env[] = "SSH_ASKPASS=";
|
||
|
||
int main (int argc, char * * argv)
|
||
{
|
||
return handleExceptions(argv[0], [&]() {
|
||
initNix();
|
||
/* Ensure we don't get any SSH passphrase or host key popups. */
|
||
if (putenv(display_env) == -1 ||
|
||
putenv(ssh_env) == -1) {
|
||
throw SysError("Setting SSH env vars");
|
||
}
|
||
|
||
if (argc != 4) {
|
||
throw UsageError("called without required arguments");
|
||
}
|
||
|
||
auto store = openStore();
|
||
|
||
auto localSystem = argv[1];
|
||
settings.maxSilentTime = stoull(string(argv[2]));
|
||
settings.buildTimeout = stoull(string(argv[3]));
|
||
|
||
currentLoad = getEnv("NIX_CURRENT_LOAD", "/run/nix/current-load");
|
||
|
||
std::shared_ptr<Store> sshStore;
|
||
AutoCloseFD bestSlotLock;
|
||
|
||
auto machines = read_conf();
|
||
string drvPath;
|
||
string hostName;
|
||
for (string line; getline(cin, line);) {
|
||
auto tokens = tokenizeString<std::vector<string>>(line);
|
||
auto sz = tokens.size();
|
||
if (sz != 3 && sz != 4) {
|
||
throw Error(format("invalid build hook line %1%") % line);
|
||
}
|
||
auto amWilling = tokens[0] == "1";
|
||
auto neededSystem = tokens[1];
|
||
drvPath = tokens[2];
|
||
auto requiredFeatures = sz == 3 ?
|
||
std::set<string>{} :
|
||
tokenizeString<std::set<string>>(tokens[3], ",");
|
||
auto canBuildLocally = amWilling && (neededSystem == localSystem);
|
||
|
||
/* Error ignored here, will be caught later */
|
||
mkdir(currentLoad.c_str(), 0777);
|
||
|
||
while (true) {
|
||
bestSlotLock = -1;
|
||
AutoCloseFD lock = openLockFile(currentLoad + "/main-lock", true);
|
||
lockFile(lock.get(), ltWrite, true);
|
||
|
||
bool rightType = false;
|
||
|
||
machine * bestMachine = nullptr;
|
||
unsigned long long bestLoad = 0;
|
||
for (auto & m : machines) {
|
||
if (m.enabled && std::find(m.systemTypes.begin(),
|
||
m.systemTypes.end(),
|
||
neededSystem) != m.systemTypes.end() &&
|
||
m.allSupported(requiredFeatures) &&
|
||
m.mandatoryMet(requiredFeatures)) {
|
||
rightType = true;
|
||
AutoCloseFD free;
|
||
unsigned long long load = 0;
|
||
for (unsigned long long slot = 0; slot < m.maxJobs; ++slot) {
|
||
AutoCloseFD slotLock = openSlotLock(m, slot);
|
||
if (lockFile(slotLock.get(), ltWrite, false)) {
|
||
if (!free) {
|
||
free = std::move(slotLock);
|
||
}
|
||
} else {
|
||
++load;
|
||
}
|
||
}
|
||
if (!free) {
|
||
continue;
|
||
}
|
||
bool best = false;
|
||
if (!bestSlotLock) {
|
||
best = true;
|
||
} else if (load / m.speedFactor < bestLoad / bestMachine->speedFactor) {
|
||
best = true;
|
||
} else if (load / m.speedFactor == bestLoad / bestMachine->speedFactor) {
|
||
if (m.speedFactor > bestMachine->speedFactor) {
|
||
best = true;
|
||
} else if (m.speedFactor == bestMachine->speedFactor) {
|
||
if (load < bestLoad) {
|
||
best = true;
|
||
}
|
||
}
|
||
}
|
||
if (best) {
|
||
bestLoad = load;
|
||
bestSlotLock = std::move(free);
|
||
bestMachine = &m;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (!bestSlotLock) {
|
||
if (rightType && !canBuildLocally) {
|
||
cerr << "# postpone\n";
|
||
} else {
|
||
cerr << "# decline\n";
|
||
}
|
||
break;
|
||
}
|
||
|
||
futimens(bestSlotLock.get(), NULL);
|
||
|
||
lock = -1;
|
||
|
||
try {
|
||
sshStore = openStore("ssh://" + bestMachine->hostName + "?key=" + bestMachine->sshKey);
|
||
hostName = bestMachine->hostName;
|
||
} catch (std::exception & e) {
|
||
cerr << e.what() << '\n';
|
||
cerr << "unable to open SSH connection to ‘" << bestMachine->hostName << "’, trying other available machines...\n";
|
||
bestMachine->enabled = false;
|
||
continue;
|
||
}
|
||
goto connected;
|
||
}
|
||
}
|
||
connected:
|
||
cerr << "# accept\n";
|
||
string line;
|
||
if (!getline(cin, line)) {
|
||
throw Error("hook caller didn't send inputs");
|
||
}
|
||
auto inputs = tokenizeString<std::list<string>>(line);
|
||
if (!getline(cin, line)) {
|
||
throw Error("hook caller didn't send outputs");
|
||
}
|
||
auto outputs = tokenizeString<Strings>(line);
|
||
AutoCloseFD uploadLock = openLockFile(currentLoad + "/" + hostName + ".upload-lock", true);
|
||
auto old = signal(SIGALRM, handle_alarm);
|
||
alarm(15 * 60);
|
||
if (!lockFile(uploadLock.get(), ltWrite, true)) {
|
||
cerr << "somebody is hogging the upload lock for " << hostName << ", continuing...\n";
|
||
}
|
||
alarm(0);
|
||
signal(SIGALRM, old);
|
||
copyPaths(store, ref<Store>(sshStore), inputs);
|
||
uploadLock = -1;
|
||
|
||
cerr << "building ‘" << drvPath << "’ on ‘" << hostName << "’\n";
|
||
sshStore->buildDerivation(drvPath, readDerivation(drvPath));
|
||
|
||
std::remove_if(outputs.begin(), outputs.end(), [=](const Path & path) { return store->isValidPath(path); });
|
||
if (!outputs.empty()) {
|
||
setenv("NIX_HELD_LOCKS", concatStringsSep(" ", outputs).c_str(), 1); /* FIXME: ugly */
|
||
copyPaths(ref<Store>(sshStore), store, outputs);
|
||
}
|
||
return;
|
||
});
|
||
}
|