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#include <algorithm>
#include <glog/logging.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include "libexpr/eval.hh"
#include "libmain/common-args.hh"
#include "libmain/shared.hh"
#include "libstore/download.hh"
#include "libstore/globals.hh"
#include "libstore/store-api.hh"
#include "libutil/finally.hh"
#include "nix/command.hh"
#include "nix/legacy.hh"
extern std::string chrootHelperName;
void chrootHelper(int argc, char** argv);
namespace nix {
/* Check if we have a non-loopback/link-local network interface. */
static bool haveInternet() {
struct ifaddrs* addrs = nullptr;
if (getifaddrs(&addrs) != 0) {
return true;
}
Finally free([&]() { freeifaddrs(addrs); });
for (auto i = addrs; i != nullptr; i = i->ifa_next) {
if (i->ifa_addr == nullptr) {
continue;
}
if (i->ifa_addr->sa_family == AF_INET) {
if (ntohl(
(reinterpret_cast<sockaddr_in*>(i->ifa_addr))->sin_addr.s_addr) !=
INADDR_LOOPBACK) {
return true;
}
} else if (i->ifa_addr->sa_family == AF_INET6) {
if (!IN6_IS_ADDR_LOOPBACK(&((sockaddr_in6*)i->ifa_addr)->sin6_addr) &&
!IN6_IS_ADDR_LINKLOCAL(&((sockaddr_in6*)i->ifa_addr)->sin6_addr)) {
return true;
}
}
}
return false;
}
std::string programPath;
struct NixArgs : virtual MultiCommand, virtual MixCommonArgs {
bool printBuildLogs = false;
bool useNet = true;
NixArgs() : MultiCommand(*RegisterCommand::commands), MixCommonArgs("nix") {
mkFlag()
.longName("help")
.description("show usage information")
.handler([&]() { showHelpAndExit(); });
mkFlag()
.longName("help-config")
.description("show configuration options")
.handler([&]() {
std::cout << "The following configuration options are available:\n\n";
Table2 tbl;
std::map<std::string, Config::SettingInfo> settings;
globalConfig.getSettings(settings);
for (const auto& s : settings) {
tbl.emplace_back(s.first, s.second.description);
}
printTable(std::cout, tbl);
throw Exit();
});
mkFlag()
.longName("print-build-logs")
.shortName('L')
.description("print full build logs on stderr")
.set(&printBuildLogs, true);
mkFlag()
.longName("version")
.description("show version information")
.handler([&]() { printVersion(programName); });
mkFlag()
.longName("no-net")
.description(
"disable substituters and consider all previously downloaded files "
"up-to-date")
.handler([&]() { useNet = false; });
}
void printFlags(std::ostream& out) override {
Args::printFlags(out);
std::cout << "\n"
"In addition, most configuration settings can be overriden "
"using '--<name> <value>'.\n"
"Boolean settings can be overriden using '--<name>' or "
"'--no-<name>'. See 'nix\n"
"--help-config' for a list of configuration settings.\n";
}
void showHelpAndExit() {
printHelp(programName, std::cout);
std::cout
<< "\nNote: this program is EXPERIMENTAL and subject to change.\n";
throw Exit();
}
};
void mainWrapped(int argc, char** argv) {
/* The chroot helper needs to be run before any threads have been
started. */
if (argc > 0 && argv[0] == chrootHelperName) {
chrootHelper(argc, argv);
return;
}
initNix();
initGC();
programPath = argv[0];
std::string programName = baseNameOf(programPath);
{
auto legacy = (*RegisterLegacyCommand::commands)[programName];
if (legacy) {
return legacy(argc, argv);
}
}
settings.verboseBuild = false;
NixArgs args;
args.parseCmdline(argvToStrings(argc, argv));
if (!args.command) {
args.showHelpAndExit();
}
if (args.useNet && !haveInternet()) {
LOG(WARNING) << "you don't have Internet access; "
<< "disabling some network-dependent features";
args.useNet = false;
}
if (!args.useNet) {
// FIXME: should check for command line overrides only.
if (!settings.useSubstitutes.overriden) {
settings.useSubstitutes = false;
}
if (!settings.tarballTtl.overriden) {
settings.tarballTtl = std::numeric_limits<unsigned int>::max();
}
if (!downloadSettings.tries.overriden) {
downloadSettings.tries = 0;
}
if (!downloadSettings.connectTimeout.overriden) {
downloadSettings.connectTimeout = 1;
}
}
args.command->prepare();
args.command->run();
}
} // namespace nix
int main(int argc, char* argv[]) {
FLAGS_logtostderr = true;
google::InitGoogleLogging(argv[0]);
return nix::handleExceptions(argv[0],
[&]() { nix::mainWrapped(argc, argv); });
}
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