eldritch horrors
ac64c727b5
this allows us great flexibility in how children are launched (since the actual launching is done by a separate executable), makes fork no longer needed in the core codebase (outside of runProgram, anyway), and we even get to use linux vfork to its full potential to decrease the launch cost of sandboxes to a constant factor (previously it was O(#drvs + #deps) of the build graph, which obviously goes to n² quickly if you are unlucky.) Change-Id: I66e2d1b20242dc24d708666ef325fb8725bd9296
73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
#pragma once
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///@file
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#include "lix/libstore/build/request.capnp.h"
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#include <boost/format.hpp>
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#include <cstring>
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#include <exception>
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#include <memory>
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#include <string>
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#include <string_view>
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#include <unistd.h>
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#include <vector>
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namespace nix {
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bool prepareChildSetup(nix::build::Request::Reader request);
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void finishChildSetup(nix::build::Request::Reader request);
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[[noreturn]]
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void execBuilder(nix::build::Request::Reader request);
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// silence the foreign exception lint for this helper
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class BaseException : public std::exception
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{};
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class SysError : public BaseException
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{
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private:
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std::shared_ptr<std::string> msg;
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public:
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explicit SysError(auto fmt, const auto &... args) : SysError(errno, fmt, args...) {}
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SysError(int error, auto fmt, const auto &... args)
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{
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const auto errstr = strerror(error);
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auto format = boost::format(fmt);
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((format % args), ...);
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msg = std::make_shared<std::string>(format.str() + ": " + errstr);
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}
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const char * what() const noexcept override
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{
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return msg->c_str();
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}
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};
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struct ExecRequest
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{
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std::string builder;
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std::vector<std::string> argsStorage, envsStorage;
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std::vector<char *> args, envs;
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ExecRequest(nix::build::Request::Reader request);
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};
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void writeFull(int fd, std::string_view data);
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extern bool printDebugLogs;
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inline void printDebugLog(auto fmt, const auto &... args)
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{
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auto format = boost::format(fmt);
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((format % args), ...);
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writeFull(STDERR_FILENO, format.str());
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}
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#define debug(msg, ...) \
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do { \
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if (::nix::printDebugLogs) { \
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printDebugLog(msg "\n", __VA_ARGS__); \
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} \
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} while (0)
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}
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