95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
#include "child.hh"
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#include "error.hh"
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#include "file-system.hh"
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#include "globals.hh"
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#include "hook-instance.hh"
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#include "strings.hh"
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namespace nix {
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HookInstance::HookInstance()
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{
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debug("starting build hook '%s'", concatStringsSep(" ", settings.buildHook.get()));
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auto buildHookArgs = settings.buildHook.get();
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if (buildHookArgs.empty())
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throw Error("'build-hook' setting is empty");
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auto buildHook = canonPath(buildHookArgs.front());
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buildHookArgs.pop_front();
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Strings args;
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args.push_back(std::string(baseNameOf(buildHook)));
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for (auto & arg : buildHookArgs)
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args.push_back(arg);
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args.push_back(std::to_string(verbosity));
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/* Create a pipe to get the output of the child. */
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Pipe fromHook_;
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fromHook_.create();
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/* Create the communication pipes. */
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Pipe toHook_;
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toHook_.create();
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/* Create a pipe to get the output of the builder. */
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Pipe builderOut_;
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builderOut_.create();
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/* Fork the hook. */
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pid = startProcess([&]() {
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if (dup2(fromHook_.writeSide.get(), STDERR_FILENO) == -1)
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throw SysError("cannot pipe standard error into log file");
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commonExecveingChildInit();
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if (chdir("/") == -1) throw SysError("changing into /");
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/* Dup the communication pipes. */
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if (dup2(toHook_.readSide.get(), STDIN_FILENO) == -1)
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throw SysError("dupping to-hook read side");
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/* Use fd 4 for the builder's stdout/stderr. */
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if (dup2(builderOut_.writeSide.get(), 4) == -1)
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throw SysError("dupping builder's stdout/stderr");
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/* Hack: pass the read side of that fd to allow build-remote
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to read SSH error messages. */
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if (dup2(builderOut_.readSide.get(), 5) == -1)
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throw SysError("dupping builder's stdout/stderr");
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execv(buildHook.c_str(), stringsToCharPtrs(args).data());
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throw SysError("executing '%s'", buildHook);
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});
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pid.setSeparatePG(true);
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fromHook = std::move(fromHook_.readSide);
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toHook = std::move(toHook_.writeSide);
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builderOut = std::move(builderOut_.readSide);
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sink = FdSink(toHook.get());
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std::map<std::string, Config::SettingInfo> settings;
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globalConfig.getSettings(settings, true);
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for (auto & setting : settings)
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sink << 1 << setting.first << setting.second.value;
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sink << 0;
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}
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HookInstance::~HookInstance()
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{
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try {
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toHook.reset();
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if (pid) pid.kill();
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} catch (...) {
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ignoreExceptionInDestructor();
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}
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}
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}
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