403 lines
12 KiB
C++
403 lines
12 KiB
C++
#include "config.h"
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#include "shared.hh"
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#include "globals.hh"
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#include "store-api.hh"
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#include "util.hh"
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#include "misc.hh"
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#include <iostream>
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#include <cctype>
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#include <exception>
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#include <sys/stat.h>
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#include <unistd.h>
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#if HAVE_BOEHMGC
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#include <gc/gc.h>
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#endif
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namespace nix {
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volatile sig_atomic_t blockInt = 0;
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static void sigintHandler(int signo)
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{
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if (!blockInt) {
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_isInterrupted = 1;
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blockInt = 1;
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}
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}
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Path makeRootName(const Path & gcRoot, int & counter)
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{
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counter++;
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if (counter == 1)
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return gcRoot;
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else
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return (format("%1%-%2%") % gcRoot % counter).str();
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}
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void printGCWarning()
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{
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static bool haveWarned = false;
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warnOnce(haveWarned,
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"you did not specify `--add-root'; "
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"the result might be removed by the garbage collector");
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}
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void printMissing(const PathSet & paths)
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{
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unsigned long long downloadSize;
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PathSet willBuild, willSubstitute, unknown;
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queryMissing(paths, willBuild, willSubstitute, unknown, downloadSize);
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if (!willBuild.empty()) {
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printMsg(lvlInfo, format("the following derivations will be built:"));
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foreach (PathSet::iterator, i, willBuild)
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printMsg(lvlInfo, format(" %1%") % *i);
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}
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if (!willSubstitute.empty()) {
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printMsg(lvlInfo, format("the following paths will be downloaded/copied (%.2f MiB):") %
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(downloadSize / (1024.0 * 1024.0)));
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foreach (PathSet::iterator, i, willSubstitute)
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printMsg(lvlInfo, format(" %1%") % *i);
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}
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if (!unknown.empty()) {
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printMsg(lvlInfo, format("don't know how to build the following paths%1%:")
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% (readOnlyMode ? " (may be caused by read-only store access)" : ""));
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foreach (PathSet::iterator, i, unknown)
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printMsg(lvlInfo, format(" %1%") % *i);
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}
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}
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static void setLogType(string lt)
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{
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if (lt == "pretty") logType = ltPretty;
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else if (lt == "escapes") logType = ltEscapes;
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else if (lt == "flat") logType = ltFlat;
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else throw UsageError("unknown log type");
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}
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static void closeStore()
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{
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try {
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throw;
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} catch (std::exception & e) {
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printMsg(lvlError,
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format("FATAL: unexpected exception (closing store and aborting): %1%") % e.what());
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}
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try {
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store.reset((StoreAPI *) 0);
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} catch (...) {
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ignoreException();
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}
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abort();
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}
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RemoveTempRoots::~RemoveTempRoots()
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{
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removeTempRoots();
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}
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static bool showTrace = false;
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/* Initialize and reorder arguments, then call the actual argument
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processor. */
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static void initAndRun(int argc, char * * argv)
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{
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/* Setup Nix paths. */
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nixStore = canonPath(getEnv("NIX_STORE_DIR", getEnv("NIX_STORE", NIX_STORE_DIR)));
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nixDataDir = canonPath(getEnv("NIX_DATA_DIR", NIX_DATA_DIR));
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nixLogDir = canonPath(getEnv("NIX_LOG_DIR", NIX_LOG_DIR));
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nixStateDir = canonPath(getEnv("NIX_STATE_DIR", NIX_STATE_DIR));
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nixDBPath = getEnv("NIX_DB_DIR", nixStateDir + "/db");
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nixConfDir = canonPath(getEnv("NIX_CONF_DIR", NIX_CONF_DIR));
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nixLibexecDir = canonPath(getEnv("NIX_LIBEXEC_DIR", NIX_LIBEXEC_DIR));
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nixBinDir = canonPath(getEnv("NIX_BIN_DIR", NIX_BIN_DIR));
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string subs = getEnv("NIX_SUBSTITUTERS", "default");
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if (subs == "default") {
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substituters.push_back(nixLibexecDir + "/nix/substituters/copy-from-other-stores.pl");
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substituters.push_back(nixLibexecDir + "/nix/substituters/download-using-manifests.pl");
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} else
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substituters = tokenizeString(subs, ":");
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/* Get some settings from the configuration file. */
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thisSystem = querySetting("system", SYSTEM);
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maxBuildJobs = queryIntSetting("build-max-jobs", 1);
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buildCores = queryIntSetting("build-cores", 1);
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maxSilentTime = queryIntSetting("build-max-silent-time", 0);
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/* Catch SIGINT. */
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struct sigaction act;
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act.sa_handler = sigintHandler;
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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if (sigaction(SIGINT, &act, 0))
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throw SysError("installing handler for SIGINT");
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if (sigaction(SIGTERM, &act, 0))
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throw SysError("installing handler for SIGTERM");
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if (sigaction(SIGHUP, &act, 0))
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throw SysError("installing handler for SIGHUP");
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/* Ignore SIGPIPE. */
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act.sa_handler = SIG_IGN;
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act.sa_flags = 0;
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if (sigaction(SIGPIPE, &act, 0))
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throw SysError("ignoring SIGPIPE");
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/* Reset SIGCHLD to its default. */
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act.sa_handler = SIG_DFL;
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act.sa_flags = 0;
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if (sigaction(SIGCHLD, &act, 0))
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throw SysError("resetting SIGCHLD");
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/* There is no privacy in the Nix system ;-) At least not for
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now. In particular, store objects should be readable by
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everybody. This prevents nasty surprises when using a shared
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store (with the setuid() hack). */
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umask(0022);
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/* Process the NIX_LOG_TYPE environment variable. */
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string lt = getEnv("NIX_LOG_TYPE");
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if (lt != "") setLogType(lt);
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/* Put the arguments in a vector. */
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Strings args, remaining;
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while (argc--) args.push_back(*argv++);
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args.erase(args.begin());
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/* Expand compound dash options (i.e., `-qlf' -> `-q -l -f'), and
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ignore options for the ATerm library. */
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for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
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string arg = *i;
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if (string(arg, 0, 4) == "-at-") ;
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else if (arg.length() > 2 && arg[0] == '-' && arg[1] != '-' && !isdigit(arg[1])) {
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for (unsigned int j = 1; j < arg.length(); j++)
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if (isalpha(arg[j]))
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remaining.push_back((string) "-" + arg[j]);
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else {
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remaining.push_back(string(arg, j));
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break;
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}
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} else remaining.push_back(arg);
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}
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args = remaining;
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remaining.clear();
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/* Process default options. */
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for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
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string arg = *i;
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if (arg == "--verbose" || arg == "-v")
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verbosity = (Verbosity) ((int) verbosity + 1);
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else if (arg == "--log-type") {
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++i;
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if (i == args.end()) throw UsageError("`--log-type' requires an argument");
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setLogType(*i);
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}
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else if (arg == "--build-output" || arg == "-B")
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; /* !!! obsolete - remove eventually */
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else if (arg == "--no-build-output" || arg == "-Q")
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buildVerbosity = lvlVomit;
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else if (arg == "--print-build-trace")
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printBuildTrace = true;
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else if (arg == "--help") {
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printHelp();
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return;
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}
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else if (arg == "--version") {
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std::cout << format("%1% (Nix) %2%") % programId % NIX_VERSION << std::endl;
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return;
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}
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else if (arg == "--keep-failed" || arg == "-K")
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keepFailed = true;
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else if (arg == "--keep-going" || arg == "-k")
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keepGoing = true;
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else if (arg == "--fallback")
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tryFallback = true;
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else if (arg == "--max-jobs" || arg == "-j")
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maxBuildJobs = getIntArg<unsigned int>(arg, i, args.end());
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else if (arg == "--cores")
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buildCores = getIntArg<unsigned int>(arg, i, args.end());
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else if (arg == "--readonly-mode")
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readOnlyMode = true;
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else if (arg == "--max-silent-time")
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maxSilentTime = getIntArg<unsigned int>(arg, i, args.end());
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else if (arg == "--no-build-hook")
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useBuildHook = false;
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else if (arg == "--show-trace")
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showTrace = true;
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else if (arg == "--option") {
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++i; if (i == args.end()) throw UsageError("`--option' requires two arguments");
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string name = *i;
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++i; if (i == args.end()) throw UsageError("`--option' requires two arguments");
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string value = *i;
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overrideSetting(name, tokenizeString(value));
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}
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else remaining.push_back(arg);
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}
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/* Automatically clean up the temporary roots file when we
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exit. */
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RemoveTempRoots removeTempRoots __attribute__((unused));
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/* Make sure that the database gets closed properly, even if
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terminate() is called (which happens sometimes due to bugs in
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destructor/exceptions interaction, but that needn't preclude a
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clean shutdown of the database). */
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std::set_terminate(closeStore);
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run(remaining);
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/* Close the Nix database. */
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store.reset((StoreAPI *) 0);
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}
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bool setuidMode = false;
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static void setuidInit()
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{
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/* Don't do anything if this is not a setuid binary. */
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if (getuid() == geteuid() && getgid() == getegid()) return;
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uid_t nixUid = geteuid();
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gid_t nixGid = getegid();
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setuidCleanup();
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/* Don't trust the current directory. */
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if (chdir("/") == -1) abort();
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/* Set the real (and preferably also the save) uid/gid to the
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effective uid/gid. This matters mostly when we're not using
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build-users (bad!), since some builders (like Perl) complain
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when real != effective.
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On systems where setresuid is unavailable, we can't drop the
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saved uid/gid. This means that we could go back to the
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original real uid (i.e., the uid of the caller). That's not
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really a problem, except maybe when we execute a builder and
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we're not using build-users. In that case, the builder may be
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able to switch to the uid of the caller and possibly do bad
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stuff. But note that when not using build-users, the builder
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could also modify the Nix executables (say, replace them by a
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Trojan horse), so the problem is already there. */
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#if HAVE_SETRESUID
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if (setresuid(nixUid, nixUid, nixUid)) abort();
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if (setresgid(nixGid, nixGid, nixGid)) abort();
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#elif HAVE_SETREUID
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/* Note: doesn't set saved uid/gid! */
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fprintf(stderr, "warning: cannot set saved uid\n");
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if (setreuid(nixUid, nixUid)) abort();
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if (setregid(nixGid, nixGid)) abort();
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#else
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/* Note: doesn't set real and saved uid/gid! */
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fprintf(stderr, "warning: cannot set real and saved uids\n");
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if (setuid(nixUid)) abort();
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if (setgid(nixGid)) abort();
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#endif
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setuidMode = true;
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}
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/* Called when the Boehm GC runs out of memory. */
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static void * oomHandler(size_t requested)
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{
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/* Convert this to a proper C++ exception. */
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throw std::bad_alloc();
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}
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}
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static char buf[1024];
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int main(int argc, char * * argv)
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{
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using namespace nix;
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/* If we're setuid, then we need to take some security precautions
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right away. */
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if (argc == 0) abort();
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setuidInit();
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/* Turn on buffering for cerr. */
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#if HAVE_PUBSETBUF
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std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf));
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#endif
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std::ios::sync_with_stdio(false);
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#if HAVE_BOEHMGC
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/* Initialise the Boehm garbage collector. This isn't necessary
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on most platforms, but for portability we do it anyway. */
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GC_INIT();
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GC_oom_fn = oomHandler;
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/* Set the initial heap size to something fairly big (384 MiB) so
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that in most cases we don't need to garbage collect at all.
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(Collection has a fairly significant overhead, some.) The heap
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size can be overriden through libgc's GC_INITIAL_HEAP_SIZE
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environment variable. We should probably also provide a
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nix.conf setting for this. Note that GC_expand_hp() causes a
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lot of virtual, but not physical (resident) memory to be
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allocated. This might be a problem on systems that don't
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overcommit. */
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if (!getenv("GC_INITIAL_HEAP_SIZE"))
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GC_expand_hp(384 * 1024 * 1024);
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#endif
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try {
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try {
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initAndRun(argc, argv);
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} catch (...) {
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/* Subtle: we have to make sure that any `interrupted'
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condition is discharged before we reach printMsg()
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below, since otherwise it will throw an (uncaught)
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exception. */
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blockInt = 1; /* ignore further SIGINTs */
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_isInterrupted = 0;
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throw;
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}
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} catch (UsageError & e) {
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printMsg(lvlError,
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format(
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"error: %1%\n"
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"Try `%2% --help' for more information.")
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% e.what() % programId);
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return 1;
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} catch (BaseError & e) {
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printMsg(lvlError, format("error: %1%%2%") % (showTrace ? e.prefix() : "") % e.msg());
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if (e.prefix() != "" && !showTrace)
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printMsg(lvlError, "(use `--show-trace' to show detailed location information)");
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return 1;
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} catch (std::exception & e) {
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printMsg(lvlError, format("error: %1%") % e.what());
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return 1;
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}
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return 0;
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}
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