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