Launch.cpp

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#include "nixd/Eval/Launch.h"
#include "nixd/CommandLine/Options.h"
 
#include <llvm/Support/CommandLine.h>
 
using namespace llvm::cl;
using namespace nixd;
 
namespace {
 
#define NULL_DEVICE "/dev/null"
 
opt<std::string> OptionWorkerStderr{
    "option-worker-stderr", desc("Directory to write options worker stderr"),
    cat(NixdCategory), init(NULL_DEVICE)};
 
opt<std::string> NixpkgsWorkerStderr{
    "nixpkgs-worker-stderr",
    desc("Writable file path for nixpkgs worker stderr (debugging)"),
    cat(NixdCategory), init(NULL_DEVICE)};
 
} // namespace
 
void nixd::startAttrSetEval(const std::string &Name,
                            std::unique_ptr<AttrSetClientProc> &Worker) {
  Worker = std::make_unique<AttrSetClientProc>([&Name]() {
    freopen(Name.c_str(), "w", stderr);
    return execl(AttrSetClient::getExe(), "nixd-attrset-eval", nullptr);
  });
}
 
void nixd::startNixpkgs(std::unique_ptr<AttrSetClientProc> &NixpkgsEval) {
  startAttrSetEval(NixpkgsWorkerStderr, NixpkgsEval);
}
 
void nixd::startOption(const std::string &Name,
                       std::unique_ptr<AttrSetClientProc> &Worker) {
  std::string NewName = NULL_DEVICE;
  if (OptionWorkerStderr.getNumOccurrences())
    NewName = OptionWorkerStderr.getValue() + "/" + Name;
  startAttrSetEval(NewName, Worker);
}