diff options
Diffstat (limited to 'third_party/nix/src/libmain/shared.cc')
| -rw-r--r-- | third_party/nix/src/libmain/shared.cc | 406 |
1 files changed, 406 insertions, 0 deletions
diff --git a/third_party/nix/src/libmain/shared.cc b/third_party/nix/src/libmain/shared.cc new file mode 100644 index 000000000000..f6c80cae30ef --- /dev/null +++ b/third_party/nix/src/libmain/shared.cc @@ -0,0 +1,406 @@ +#include "shared.hh" + +#include <algorithm> +#include <cctype> +#include <csignal> +#include <cstdlib> +#include <exception> +#include <iostream> +#include <mutex> +#include <utility> + +#include <glog/logging.h> +#include <openssl/crypto.h> +#include <sys/stat.h> +#include <sys/time.h> +#include <unistd.h> + +#include "globals.hh" +#include "store-api.hh" +#include "util.hh" + +namespace nix { + +static bool gcWarning = true; + +void printGCWarning() { + if (!gcWarning) { + return; + } + + static bool haveWarned = false; + if (!haveWarned) { + haveWarned = true; + LOG(WARNING) << "you did not specify '--add-root'; " + << "the result might be removed by the garbage collector"; + } +} + +void printMissing(const ref<Store>& store, const PathSet& paths) { + unsigned long long downloadSize; + unsigned long long narSize; + PathSet willBuild; + PathSet willSubstitute; + PathSet unknown; + store->queryMissing(paths, willBuild, willSubstitute, unknown, downloadSize, + narSize); + printMissing(store, willBuild, willSubstitute, unknown, downloadSize, + narSize); +} + +void printMissing(const ref<Store>& store, const PathSet& willBuild, + const PathSet& willSubstitute, const PathSet& unknown, + unsigned long long downloadSize, unsigned long long narSize) { + if (!willBuild.empty()) { + LOG(INFO) << "these derivations will be built:"; + Paths sorted = store->topoSortPaths(willBuild); + reverse(sorted.begin(), sorted.end()); + for (auto& i : sorted) { + LOG(INFO) << " " << i; + } + } + + if (!willSubstitute.empty()) { + LOG(INFO) << "these paths will be fetched (" + << (downloadSize / (1024.0 * 1024.0)) << " MiB download, " + << (narSize / (1024.0 * 1024.0)) << "MiB unpacked):"; + + for (auto& i : willSubstitute) { + LOG(INFO) << i; + } + } + + if (!unknown.empty()) { + LOG(INFO) << "don't know how to build these paths" + << (settings.readOnlyMode + ? " (may be caused by read-only store access)" + : "") + << ":"; + + for (auto& i : unknown) { + LOG(INFO) << i; + } + } +} + +string getArg(const string& opt, Strings::iterator& i, + const Strings::iterator& end) { + ++i; + if (i == end) { + throw UsageError(format("'%1%' requires an argument") % opt); + } + + return *i; +} + +#if OPENSSL_VERSION_NUMBER < 0x10101000L +/* OpenSSL is not thread-safe by default - it will randomly crash + unless the user supplies a mutex locking function. So let's do + that. */ +static std::vector<std::mutex> opensslLocks; + +static void opensslLockCallback(int mode, int type, const char* file, + int line) { + if (mode & CRYPTO_LOCK) + opensslLocks[type].lock(); + else + opensslLocks[type].unlock(); +} +#endif + +static void sigHandler(int signo) {} + +void initNix() { + /* Turn on buffering for cerr. */ +#if HAVE_PUBSETBUF + static char buf[1024]; + std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf)); +#endif + +#if OPENSSL_VERSION_NUMBER < 0x10101000L + /* Initialise OpenSSL locking. */ + opensslLocks = std::vector<std::mutex>(CRYPTO_num_locks()); + CRYPTO_set_locking_callback(opensslLockCallback); +#endif + + loadConfFile(); + + startSignalHandlerThread(); + + /* Reset SIGCHLD to its default. */ + struct sigaction act; + sigemptyset(&act.sa_mask); + act.sa_handler = SIG_DFL; + act.sa_flags = 0; + if (sigaction(SIGCHLD, &act, nullptr) != 0) { + throw SysError("resetting SIGCHLD"); + } + + /* Install a dummy SIGUSR1 handler for use with pthread_kill(). */ + act.sa_handler = sigHandler; + if (sigaction(SIGUSR1, &act, nullptr) != 0) { + throw SysError("handling SIGUSR1"); + } + +#if __APPLE__ + /* HACK: on darwin, we need can’t use sigprocmask with SIGWINCH. + * Instead, add a dummy sigaction handler, and signalHandlerThread + * can handle the rest. */ + struct sigaction sa; + sa.sa_handler = sigHandler; + if (sigaction(SIGWINCH, &sa, 0)) { + throw SysError("handling SIGWINCH"); + } +#endif + + /* Register a SIGSEGV handler to detect stack overflows. */ + detectStackOverflow(); + + /* There is no privacy in the Nix system ;-) At least not for + now. In particular, store objects should be readable by + everybody. */ + umask(0022); + + /* Initialise the PRNG. */ + struct timeval tv; + gettimeofday(&tv, nullptr); + srandom(tv.tv_usec); + + /* On macOS, don't use the per-session TMPDIR (as set e.g. by + sshd). This breaks build users because they don't have access + to the TMPDIR, in particular in ‘nix-store --serve’. */ +#if __APPLE__ + if (getuid() == 0 && hasPrefix(getEnv("TMPDIR"), "/var/folders/")) + unsetenv("TMPDIR"); +#endif +} + +LegacyArgs::LegacyArgs( + const std::string& programName, + std::function<bool(Strings::iterator& arg, const Strings::iterator& end)> + parseArg) + : MixCommonArgs(programName), parseArg(std::move(parseArg)) { + mkFlag() + .longName("no-build-output") + .shortName('Q') + .description("do not show build output") + .set(&settings.verboseBuild, false); + + mkFlag() + .longName("keep-failed") + .shortName('K') + .description("keep temporary directories of failed builds") + .set(&(bool&)settings.keepFailed, true); + + mkFlag() + .longName("keep-going") + .shortName('k') + .description("keep going after a build fails") + .set(&(bool&)settings.keepGoing, true); + + mkFlag() + .longName("fallback") + .description("build from source if substitution fails") + .set(&(bool&)settings.tryFallback, true); + + auto intSettingAlias = [&](char shortName, const std::string& longName, + const std::string& description, + const std::string& dest) { + mkFlag<unsigned int>(shortName, longName, description, [=](unsigned int n) { + settings.set(dest, std::to_string(n)); + }); + }; + + intSettingAlias(0, "cores", + "maximum number of CPU cores to use inside a build", "cores"); + intSettingAlias(0, "max-silent-time", + "number of seconds of silence before a build is killed", + "max-silent-time"); + intSettingAlias(0, "timeout", "number of seconds before a build is killed", + "timeout"); + + mkFlag(0, "readonly-mode", "do not write to the Nix store", + &settings.readOnlyMode); + + mkFlag(0, "no-gc-warning", "disable warning about not using '--add-root'", + &gcWarning, false); + + mkFlag() + .longName("store") + .label("store-uri") + .description("URI of the Nix store to use") + .dest(&(std::string&)settings.storeUri); +} + +bool LegacyArgs::processFlag(Strings::iterator& pos, Strings::iterator end) { + if (MixCommonArgs::processFlag(pos, end)) { + return true; + } + bool res = parseArg(pos, end); + if (res) { + ++pos; + } + return res; +} + +bool LegacyArgs::processArgs(const Strings& args, bool finish) { + if (args.empty()) { + return true; + } + assert(args.size() == 1); + Strings ss(args); + auto pos = ss.begin(); + if (!parseArg(pos, ss.end())) { + throw UsageError(format("unexpected argument '%1%'") % args.front()); + } + return true; +} + +void parseCmdLine( + int argc, char** argv, + std::function<bool(Strings::iterator& arg, const Strings::iterator& end)> + parseArg) { + parseCmdLine(baseNameOf(argv[0]), argvToStrings(argc, argv), + std::move(parseArg)); +} + +void parseCmdLine( + const string& programName, const Strings& args, + std::function<bool(Strings::iterator& arg, const Strings::iterator& end)> + parseArg) { + LegacyArgs(programName, std::move(parseArg)).parseCmdline(args); +} + +void printVersion(const string& programName) { + std::cout << format("%1% (Nix) %2%") % programName % nixVersion << std::endl; + + // TODO(tazjin): figure out what the fuck this is + /*if (verbosity > lvlInfo) { + Strings cfg; +#if HAVE_BOEHMGC + cfg.push_back("gc"); +#endif +#if HAVE_SODIUM + cfg.push_back("signed-caches"); +#endif + std::cout << "Features: " << concatStringsSep(", ", cfg) << "\n"; + std::cout << "Configuration file: " << settings.nixConfDir + "/nix.conf" + << "\n"; + std::cout << "Store directory: " << settings.nixStore << "\n"; + std::cout << "State directory: " << settings.nixStateDir << "\n"; + } */ + throw Exit(); +} + +void showManPage(const string& name) { + restoreSignals(); + setenv("MANPATH", settings.nixManDir.c_str(), 1); + execlp("man", "man", name.c_str(), nullptr); + throw SysError(format("command 'man %1%' failed") % name.c_str()); +} + +int handleExceptions(const string& programName, + const std::function<void()>& fun) { + ReceiveInterrupts receiveInterrupts; // FIXME: need better place for this + + string error = ANSI_RED "error:" ANSI_NORMAL " "; + try { + try { + fun(); + } catch (...) { + /* Subtle: we have to make sure that any `interrupted' + condition is discharged before we reach printMsg() + below, since otherwise it will throw an (uncaught) + exception. */ + setInterruptThrown(); + throw; + } + } catch (Exit& e) { + return e.status; + } catch (UsageError& e) { + LOG(INFO) << e.what(); + LOG(INFO) << "Try '" << programName << " " + << " --help' for more information."; + return 1; + } catch (BaseError& e) { + LOG(ERROR) << error << (settings.showTrace ? e.prefix() : "") << e.msg(); + if (!e.prefix().empty() && !settings.showTrace) { + LOG(INFO) << "(use '--show-trace' to show detailed location information)"; + } + return e.status; + } catch (std::bad_alloc& e) { + LOG(ERROR) << error << "failed to allocate: " << e.what(); + return 1; + } catch (std::exception& e) { + LOG(ERROR) << error << e.what(); + return 1; + } + + return 0; +} + +RunPager::RunPager() { + if (isatty(STDOUT_FILENO) == 0) { + return; + } + char* pager = getenv("NIX_PAGER"); + if (pager == nullptr) { + pager = getenv("PAGER"); + } + if (pager && ((string)pager == "" || (string)pager == "cat")) { + return; + } + + Pipe toPager; + toPager.create(); + + pid = startProcess([&]() { + if (dup2(toPager.readSide.get(), STDIN_FILENO) == -1) { + throw SysError("dupping stdin"); + } + if (getenv("LESS") == nullptr) { + setenv("LESS", "FRSXMK", 1); + } + restoreSignals(); + if (pager != nullptr) { + execl("/bin/sh", "sh", "-c", pager, nullptr); + } + execlp("pager", "pager", nullptr); + execlp("less", "less", nullptr); + execlp("more", "more", nullptr); + throw SysError(format("executing '%1%'") % pager); + }); + + pid.setKillSignal(SIGINT); + + if (dup2(toPager.writeSide.get(), STDOUT_FILENO) == -1) { + throw SysError("dupping stdout"); + } +} + +RunPager::~RunPager() { + try { + if (pid != -1) { + std::cout.flush(); + close(STDOUT_FILENO); + pid.wait(); + } + } catch (...) { + ignoreException(); + } +} + +string showBytes(unsigned long long bytes) { + return (format("%.2f MiB") % (bytes / (1024.0 * 1024.0))).str(); +} + +PrintFreed::~PrintFreed() { + if (show) { + std::cout << format("%1% store paths deleted, %2% freed\n") % + results.paths.size() % showBytes(results.bytesFreed); + } +} + +Exit::~Exit() = default; + +} // namespace nix |