forked from lix-project/lix
374 lines
11 KiB
C++
374 lines
11 KiB
C++
#include "config.h"
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#include "common-args.hh"
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#include "globals.hh"
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#include "shared.hh"
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#include "store-api.hh"
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#include "util.hh"
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#include <algorithm>
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#include <cctype>
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#include <exception>
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#include <iostream>
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#include <mutex>
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#include <cstdlib>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <signal.h>
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#include <openssl/crypto.h>
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namespace nix {
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static void sigintHandler(int signo)
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{
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_isInterrupted = 1;
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}
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static bool gcWarning = true;
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void printGCWarning()
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{
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if (!gcWarning) return;
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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(ref<Store> store, const PathSet & paths)
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{
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unsigned long long downloadSize, narSize;
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PathSet willBuild, willSubstitute, unknown;
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store->queryMissing(paths, willBuild, willSubstitute, unknown, downloadSize, narSize);
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printMissing(store, willBuild, willSubstitute, unknown, downloadSize, narSize);
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}
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void printMissing(ref<Store> store, const PathSet & willBuild,
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const PathSet & willSubstitute, const PathSet & unknown,
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unsigned long long downloadSize, unsigned long long narSize)
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{
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if (!willBuild.empty()) {
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printInfo(format("these derivations will be built:"));
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Paths sorted = store->topoSortPaths(willBuild);
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reverse(sorted.begin(), sorted.end());
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for (auto & i : sorted)
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printInfo(format(" %1%") % i);
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}
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if (!willSubstitute.empty()) {
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printInfo(format("these paths will be fetched (%.2f MiB download, %.2f MiB unpacked):")
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% (downloadSize / (1024.0 * 1024.0))
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% (narSize / (1024.0 * 1024.0)));
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for (auto & i : willSubstitute)
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printInfo(format(" %1%") % i);
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}
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if (!unknown.empty()) {
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printInfo(format("don't know how to build these paths%1%:")
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% (settings.readOnlyMode ? " (may be caused by read-only store access)" : ""));
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for (auto & i : unknown)
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printInfo(format(" %1%") % i);
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}
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}
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string getArg(const string & opt,
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Strings::iterator & i, const Strings::iterator & end)
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{
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++i;
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if (i == end) throw UsageError(format("‘%1%’ requires an argument") % opt);
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return *i;
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}
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/* OpenSSL is not thread-safe by default - it will randomly crash
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unless the user supplies a mutex locking function. So let's do
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that. */
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static std::vector<std::mutex> opensslLocks;
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static void opensslLockCallback(int mode, int type, const char * file, int line)
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{
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if (mode & CRYPTO_LOCK)
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opensslLocks[type].lock();
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else
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opensslLocks[type].unlock();
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}
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void initNix()
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{
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/* Turn on buffering for cerr. */
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#if HAVE_PUBSETBUF
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static char buf[1024];
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std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf));
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#endif
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logger = makeDefaultLogger();
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/* Initialise OpenSSL locking. */
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opensslLocks = std::vector<std::mutex>(CRYPTO_num_locks());
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CRYPTO_set_locking_callback(opensslLockCallback);
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settings.processEnvironment();
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settings.loadConfFile();
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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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sigemptyset(&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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/* Register a SIGSEGV handler to detect stack overflows. */
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detectStackOverflow();
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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. */
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umask(0022);
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/* Initialise the PRNG. */
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struct timeval tv;
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gettimeofday(&tv, 0);
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srandom(tv.tv_usec);
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if (char *pack = getenv("_NIX_OPTIONS"))
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settings.unpack(pack);
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}
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struct LegacyArgs : public MixCommonArgs
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{
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std::function<bool(Strings::iterator & arg, const Strings::iterator & end)> parseArg;
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LegacyArgs(const std::string & programName,
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std::function<bool(Strings::iterator & arg, const Strings::iterator & end)> parseArg)
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: MixCommonArgs(programName), parseArg(parseArg)
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{
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mkFlag('Q', "no-build-output", "do not show build output",
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&settings.verboseBuild, false);
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mkFlag('K', "keep-failed", "keep temporary directories of failed builds",
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&settings.keepFailed);
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mkFlag('k', "keep-going", "keep going after a build fails",
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&settings.keepGoing);
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mkFlag(0, "fallback", "build from source if substitution fails", []() {
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settings.set("build-fallback", "true");
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});
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auto intSettingAlias = [&](char shortName, const std::string & longName,
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const std::string & description, const std::string & dest) {
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mkFlag<unsigned int>(shortName, longName, description, [=](unsigned int n) {
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settings.set(dest, std::to_string(n));
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});
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};
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intSettingAlias('j', "max-jobs", "maximum number of parallel builds", "build-max-jobs");
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intSettingAlias(0, "cores", "maximum number of CPU cores to use inside a build", "build-cores");
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intSettingAlias(0, "max-silent-time", "number of seconds of silence before a build is killed", "build-max-silent-time");
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intSettingAlias(0, "timeout", "number of seconds before a build is killed", "build-timeout");
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mkFlag(0, "readonly-mode", "do not write to the Nix store",
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&settings.readOnlyMode);
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mkFlag(0, "no-build-hook", "disable use of the build hook mechanism",
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&settings.useBuildHook, false);
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mkFlag(0, "show-trace", "show Nix expression stack trace in evaluation errors",
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&settings.showTrace);
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mkFlag(0, "no-gc-warning", "disable warning about not using ‘--add-root’",
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&gcWarning, false);
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}
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bool processFlag(Strings::iterator & pos, Strings::iterator end) override
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{
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if (MixCommonArgs::processFlag(pos, end)) return true;
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bool res = parseArg(pos, end);
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if (res) ++pos;
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return res;
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}
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bool processArgs(const Strings & args, bool finish) override
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{
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if (args.empty()) return true;
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assert(args.size() == 1);
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Strings ss(args);
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auto pos = ss.begin();
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if (!parseArg(pos, ss.end()))
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throw UsageError(format("unexpected argument ‘%1%’") % args.front());
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return true;
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}
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};
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void parseCmdLine(int argc, char * * argv,
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std::function<bool(Strings::iterator & arg, const Strings::iterator & end)> parseArg)
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{
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LegacyArgs(baseNameOf(argv[0]), parseArg).parseCmdline(argvToStrings(argc, argv));
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settings.update();
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}
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void printVersion(const string & programName)
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{
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std::cout << format("%1% (Nix) %2%") % programName % nixVersion << std::endl;
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if (verbosity > lvlInfo) {
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Strings cfg;
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#if HAVE_BOEHMGC
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cfg.push_back("gc");
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#endif
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#if HAVE_SODIUM
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cfg.push_back("signed-caches");
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#endif
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std::cout << "Features: " << concatStringsSep(", ", cfg) << "\n";
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std::cout << "Configuration file: " << settings.nixConfDir + "/nix.conf" << "\n";
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std::cout << "Store directory: " << settings.nixStore << "\n";
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std::cout << "State directory: " << settings.nixStateDir << "\n";
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}
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throw Exit();
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}
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void showManPage(const string & name)
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{
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restoreSIGPIPE();
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execlp("man", "man", name.c_str(), NULL);
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throw SysError(format("command ‘man %1%’ failed") % name.c_str());
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}
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int handleExceptions(const string & programName, std::function<void()> fun)
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{
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string error = ANSI_RED "error:" ANSI_NORMAL " ";
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try {
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try {
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fun();
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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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interruptThrown = true;
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throw;
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}
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} catch (Exit & e) {
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return e.status;
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} catch (UsageError & e) {
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printError(
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format(error + "%1%\nTry ‘%2% --help’ for more information.")
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% e.what() % programName);
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return 1;
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} catch (BaseError & e) {
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printError(format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
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if (e.prefix() != "" && !settings.showTrace)
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printError("(use ‘--show-trace’ to show detailed location information)");
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return e.status;
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} catch (std::bad_alloc & e) {
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printError(error + "out of memory");
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return 1;
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} catch (std::exception & e) {
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printError(error + 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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RunPager::RunPager()
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{
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if (!isatty(STDOUT_FILENO)) return;
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char * pager = getenv("NIX_PAGER");
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if (!pager) pager = getenv("PAGER");
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if (pager && ((string) pager == "" || (string) pager == "cat")) return;
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/* Ignore SIGINT. The pager will handle it (and we'll get
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SIGPIPE). */
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struct sigaction act;
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act.sa_handler = SIG_IGN;
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act.sa_flags = 0;
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sigemptyset(&act.sa_mask);
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if (sigaction(SIGINT, &act, 0)) throw SysError("ignoring SIGINT");
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restoreSIGPIPE();
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Pipe toPager;
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toPager.create();
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pid = startProcess([&]() {
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if (dup2(toPager.readSide.get(), STDIN_FILENO) == -1)
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throw SysError("dupping stdin");
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if (!getenv("LESS"))
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setenv("LESS", "FRSXMK", 1);
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if (pager)
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execl("/bin/sh", "sh", "-c", pager, NULL);
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execlp("pager", "pager", NULL);
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execlp("less", "less", NULL);
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execlp("more", "more", NULL);
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throw SysError(format("executing ‘%1%’") % pager);
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});
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if (dup2(toPager.writeSide.get(), STDOUT_FILENO) == -1)
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throw SysError("dupping stdout");
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}
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RunPager::~RunPager()
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{
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try {
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if (pid != -1) {
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std::cout.flush();
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close(STDOUT_FILENO);
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pid.wait(true);
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}
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} catch (...) {
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ignoreException();
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}
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}
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string showBytes(unsigned long long bytes)
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{
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return (format("%.2f MiB") % (bytes / (1024.0 * 1024.0))).str();
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}
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PrintFreed::~PrintFreed()
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{
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if (show)
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std::cout << format("%1% store paths deleted, %2% freed\n")
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% results.paths.size()
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% showBytes(results.bytesFreed);
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}
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}
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