nix eval-hydra-jobs: Remove
On second thought, let's move this back to Hydra.
This commit is contained in:
Eelco Dolstra
parent
1d99c4ab25
commit
4ad5826a18
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@ -1,412 +0,0 @@
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#include "command.hh"
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#include "eval.hh"
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#include "eval-inline.hh"
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#include "derivations.hh"
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#include "common-args.hh"
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#include "json.hh"
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#include "get-drvs.hh"
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#include "attr-path.hh"
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#include <nlohmann/json.hpp>
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#include <sys/resource.h>
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using namespace nix;
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static std::string queryMetaStrings(EvalState & state, DrvInfo & drv, const string & name, const string & subAttribute)
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{
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Strings res;
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std::function<void(Value & v)> rec;
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rec = [&](Value & v) {
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state.forceValue(v);
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if (v.type == tString)
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res.push_back(v.string.s);
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else if (v.isList())
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for (unsigned int n = 0; n < v.listSize(); ++n)
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rec(*v.listElems()[n]);
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else if (v.type == tAttrs) {
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auto a = v.attrs->find(state.symbols.create(subAttribute));
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if (a != v.attrs->end())
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res.push_back(state.forceString(*a->value));
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}
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};
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Value * v = drv.queryMeta(name);
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if (v) rec(*v);
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return concatStringsSep(", ", res);
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}
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struct CmdEvalHydraJobs : MixJSON, MixDryRun, InstallableCommand
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{
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std::optional<Path> gcRootsDir;
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size_t nrWorkers = 1;
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size_t maxMemorySize = 4ULL * 1024;
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CmdEvalHydraJobs()
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{
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mkFlag()
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.longName("gc-roots-dir")
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.description("garbage collector roots directory")
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.labels({"path"})
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.dest(&gcRootsDir);
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mkIntFlag(0, "workers", "number of concurrent worker processes", &nrWorkers);
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mkIntFlag(0, "max-memory-size", "maximum memory usage per worker process (in MiB)", &maxMemorySize);
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}
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std::string description() override
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{
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return "evaluate a Hydra jobset";
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}
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Examples examples() override
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{
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return {
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Example{
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"Evaluate Nixpkgs' release-combined jobset:",
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"nix eval-hydra-jobs -f '<nixpkgs/nixos/release-combined.nix>' '' --json"
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},
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};
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}
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Strings getDefaultFlakeAttrPaths() override
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{
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return {"hydraJobs", "checks"};
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}
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void worker(AutoCloseFD & to, AutoCloseFD & from)
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{
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auto state = getEvalState();
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// FIXME: should re-open state->store.
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if (dryRun) settings.readOnlyMode = true;
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/* Prevent access to paths outside of the Nix search path and
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to the environment. */
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evalSettings.restrictEval = true;
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auto autoArgs = getAutoArgs(*state);
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auto vTop = installable->toValue(*state).first;
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auto vRoot = state->allocValue();
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state->autoCallFunction(*autoArgs, *vTop, *vRoot);
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while (true) {
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/* Wait for the master to send us a job name. */
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writeLine(to.get(), "next");
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auto s = readLine(from.get());
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if (s == "exit") break;
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if (!hasPrefix(s, "do ")) abort();
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std::string attrPath(s, 3);
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debug("worker process %d at '%s'", getpid(), attrPath);
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/* Evaluate it and send info back to the master. */
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nlohmann::json reply;
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try {
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auto v = findAlongAttrPath(*state, attrPath, *autoArgs, *vRoot).first;
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state->forceValue(*v);
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if (auto drv = getDerivation(*state, *v, false)) {
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DrvInfo::Outputs outputs = drv->queryOutputs();
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if (drv->querySystem() == "unknown")
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throw EvalError("derivation must have a 'system' attribute");
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auto drvPath = drv->queryDrvPath();
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nlohmann::json job;
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job["nixName"] = drv->queryName();
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job["system"] =drv->querySystem();
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job["drvPath"] = drvPath;
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job["description"] = drv->queryMetaString("description");
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job["license"] = queryMetaStrings(*state, *drv, "license", "shortName");
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job["homepage"] = drv->queryMetaString("homepage");
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job["maintainers"] = queryMetaStrings(*state, *drv, "maintainers", "email");
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job["schedulingPriority"] = drv->queryMetaInt("schedulingPriority", 100);
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job["timeout"] = drv->queryMetaInt("timeout", 36000);
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job["maxSilent"] = drv->queryMetaInt("maxSilent", 7200);
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job["isChannel"] = drv->queryMetaBool("isHydraChannel", false);
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/* If this is an aggregate, then get its constituents. */
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auto a = v->attrs->get(state->symbols.create("_hydraAggregate"));
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if (a && state->forceBool(*a->value, *a->pos)) {
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auto a = v->attrs->get(state->symbols.create("constituents"));
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if (!a)
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throw EvalError("derivation must have a ‘constituents’ attribute");
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PathSet context;
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state->coerceToString(*a->pos, *a->value, context, true, false);
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for (auto & i : context)
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if (i.at(0) == '!') {
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size_t index = i.find("!", 1);
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job["constituents"].push_back(string(i, index + 1));
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}
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state->forceList(*a->value, *a->pos);
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for (unsigned int n = 0; n < a->value->listSize(); ++n) {
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auto v = a->value->listElems()[n];
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state->forceValue(*v);
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if (v->type == tString)
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job["namedConstituents"].push_back(state->forceStringNoCtx(*v));
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}
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}
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/* Register the derivation as a GC root. !!! This
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registers roots for jobs that we may have already
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done. */
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auto localStore = state->store.dynamic_pointer_cast<LocalFSStore>();
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if (gcRootsDir && localStore) {
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Path root = *gcRootsDir + "/" + std::string(baseNameOf(drvPath));
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if (!pathExists(root))
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localStore->addPermRoot(localStore->parseStorePath(drvPath), root, false);
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}
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nlohmann::json out;
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for (auto & j : outputs)
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out[j.first] = j.second;
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job["outputs"] = std::move(out);
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reply["job"] = std::move(job);
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}
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else if (v->type == tAttrs) {
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auto attrs = nlohmann::json::array();
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StringSet ss;
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for (auto & i : v->attrs->lexicographicOrder()) {
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std::string name(i->name);
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if (name.find('.') != std::string::npos || name.find(' ') != std::string::npos) {
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printError("skipping job with illegal name '%s'", name);
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continue;
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}
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attrs.push_back(name);
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}
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reply["attrs"] = std::move(attrs);
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}
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} catch (EvalError & e) {
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reply["error"] = filterANSIEscapes(e.msg(), true);
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}
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writeLine(to.get(), reply.dump());
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/* If our RSS exceeds the maximum, exit. The master will
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start a new process. */
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struct rusage r;
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getrusage(RUSAGE_SELF, &r);
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if ((size_t) r.ru_maxrss > maxMemorySize * 1024) break;
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}
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writeLine(to.get(), "restart");
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}
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void run(ref<Store> store) override
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{
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settings.requireExperimentalFeature("eval-hydra-jobs");
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if (!gcRootsDir) warn("'--gc-roots-dir' not specified");
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struct State
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{
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std::set<std::string> todo{""};
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std::set<std::string> active;
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nlohmann::json jobs;
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std::exception_ptr exc;
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};
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std::condition_variable wakeup;
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Sync<State> state_;
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/* Start a handler thread per worker process. */
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auto handler = [this, &state_, &wakeup]()
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{
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try {
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pid_t pid = -1;
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AutoCloseFD from, to;
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while (true) {
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/* Start a new worker process if necessary. */
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if (pid == -1) {
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Pipe toPipe, fromPipe;
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toPipe.create();
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fromPipe.create();
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pid = startProcess(
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[this,
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to{std::make_shared<AutoCloseFD>(std::move(fromPipe.writeSide))},
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from{std::make_shared<AutoCloseFD>(std::move(toPipe.readSide))}
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]()
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{
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try {
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worker(*to, *from);
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} catch (std::exception & e) {
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nlohmann::json err;
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err["error"] = e.what();
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writeLine(to->get(), err.dump());
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}
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},
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ProcessOptions { .allowVfork = false });
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from = std::move(fromPipe.readSide);
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to = std::move(toPipe.writeSide);
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debug("created worker process %d", pid);
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}
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/* Check whether the existing worker process is still there. */
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auto s = readLine(from.get());
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if (s == "restart") {
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pid = -1;
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continue;
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} else if (s != "next") {
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auto json = nlohmann::json::parse(s);
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throw Error("worker error: %s", (std::string) json["error"]);
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}
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/* Wait for a job name to become available. */
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std::string attrPath;
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while (true) {
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checkInterrupt();
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auto state(state_.lock());
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if ((state->todo.empty() && state->active.empty()) || state->exc) {
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writeLine(to.get(), "exit");
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return;
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}
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if (!state->todo.empty()) {
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attrPath = *state->todo.begin();
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state->todo.erase(state->todo.begin());
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state->active.insert(attrPath);
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break;
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} else
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state.wait(wakeup);
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}
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Activity act(*logger, lvlInfo, actUnknown, fmt("evaluating '%s'", attrPath));
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/* Tell the worker to evaluate it. */
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writeLine(to.get(), "do " + attrPath);
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/* Wait for the response. */
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auto response = nlohmann::json::parse(readLine(from.get()));
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/* Handle the response. */
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StringSet newAttrs;
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if (response.find("job") != response.end()) {
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auto state(state_.lock());
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if (json)
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state->jobs[attrPath] = response["job"];
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else
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std::cout << fmt("%d: %d\n", attrPath, (std::string) response["job"]["drvPath"]);
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}
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if (response.find("attrs") != response.end()) {
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for (auto & i : response["attrs"]) {
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auto s = (attrPath.empty() ? "" : attrPath + ".") + (std::string) i;
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newAttrs.insert(s);
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}
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}
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if (response.find("error") != response.end()) {
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auto state(state_.lock());
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if (json)
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state->jobs[attrPath]["error"] = response["error"];
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else
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printError("error in job '%s': %s",
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attrPath, (std::string) response["error"]);
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}
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/* Add newly discovered job names to the queue. */
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{
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auto state(state_.lock());
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state->active.erase(attrPath);
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for (auto & s : newAttrs)
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state->todo.insert(s);
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wakeup.notify_all();
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}
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}
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} catch (...) {
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auto state(state_.lock());
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state->exc = std::current_exception();
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wakeup.notify_all();
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}
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};
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std::vector<std::thread> threads;
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for (size_t i = 0; i < nrWorkers; i++)
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threads.emplace_back(std::thread(handler));
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for (auto & thread : threads)
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thread.join();
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auto state(state_.lock());
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if (state->exc)
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std::rethrow_exception(state->exc);
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/* For aggregate jobs that have named consistuents
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(i.e. constituents that are a job name rather than a
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derivation), look up the referenced job and add it to the
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dependencies of the aggregate derivation. */
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for (auto i = state->jobs.begin(); i != state->jobs.end(); ++i) {
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auto jobName = i.key();
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auto & job = i.value();
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auto named = job.find("namedConstituents");
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if (named == job.end()) continue;
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if (dryRun) {
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for (std::string jobName2 : *named) {
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auto job2 = state->jobs.find(jobName2);
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if (job2 == state->jobs.end())
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throw Error("aggregate job '%s' references non-existent job '%s'", jobName, jobName2);
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std::string drvPath2 = (*job2)["drvPath"];
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job["constituents"].push_back(drvPath2);
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}
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} else {
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std::string drvPath = job["drvPath"];
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auto drv = readDerivation(*store, drvPath);
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for (std::string jobName2 : *named) {
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auto job2 = state->jobs.find(jobName2);
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if (job2 == state->jobs.end())
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throw Error("aggregate job '%s' references non-existent job '%s'", jobName, jobName2);
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std::string drvPath2 = (*job2)["drvPath"];
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auto drv2 = readDerivation(*store, drvPath2);
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job["constituents"].push_back(drvPath2);
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drv.inputDrvs[store->parseStorePath(drvPath2)] = {drv2.outputs.begin()->first};
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}
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std::string drvName(store->parseStorePath(drvPath).name());
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assert(hasSuffix(drvName, drvExtension));
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drvName.resize(drvName.size() - drvExtension.size());
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auto h = hashDerivationModulo(*store, drv, true);
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auto outPath = store->makeOutputPath("out", h, drvName);
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drv.env["out"] = store->printStorePath(outPath);
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drv.outputs.insert_or_assign("out", DerivationOutput(outPath.clone(), "", ""));
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auto newDrvPath = store->printStorePath(writeDerivation(store, drv, drvName));
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debug("rewrote aggregate derivation %s -> %s", drvPath, newDrvPath);
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job["drvPath"] = newDrvPath;
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job["outputs"]["out"] = store->printStorePath(outPath);
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}
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job.erase("namedConstituents");
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}
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if (json) std::cout << state->jobs.dump(2) << "\n";
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}
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};
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static auto r1 = registerCommand<CmdEvalHydraJobs>("eval-hydra-jobs");
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