forked from lix-project/lix
346 lines
9.9 KiB
C++
346 lines
9.9 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 <algorithm>
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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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extern char * * environ;
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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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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(StoreAPI & 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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queryMissing(store, paths, willBuild, willSubstitute, unknown, downloadSize, narSize);
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printMissing(willBuild, willSubstitute, unknown, downloadSize, narSize);
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}
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void printMissing(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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printMsg(lvlInfo, format("these derivations will be built:"));
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Paths sorted = topoSortPaths(*store, willBuild);
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reverse(sorted.begin(), sorted.end());
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for (auto & i : sorted)
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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("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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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 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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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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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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void detectStackOverflow();
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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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std::ios::sync_with_stdio(false);
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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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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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/* Put the arguments in a vector. */
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Strings args;
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argc--; argv++;
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while (argc--) args.push_back(*argv++);
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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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/* Expand compound dash options (i.e., `-qlf' -> `-q -l -f'). */
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if (arg.length() > 2 && arg[0] == '-' && arg[1] != '-' && isalpha(arg[1])) {
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*i = (string) "-" + arg[1];
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auto next = i; ++next;
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for (unsigned int j = 2; j < arg.length(); j++)
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if (isalpha(arg[j]))
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args.insert(next, (string) "-" + arg[j]);
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else {
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args.insert(next, string(arg, j));
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break;
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}
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arg = *i;
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}
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if (arg == "--verbose" || arg == "-v") verbosity = (Verbosity) (verbosity + 1);
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else if (arg == "--quiet") verbosity = verbosity > lvlError ? (Verbosity) (verbosity - 1) : lvlError;
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else if (arg == "--log-type") {
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string s = getArg(arg, i, args.end());
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setLogType(s);
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}
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else if (arg == "--no-build-output" || arg == "-Q")
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settings.buildVerbosity = lvlVomit;
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else if (arg == "--print-build-trace")
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settings.printBuildTrace = true;
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else if (arg == "--keep-failed" || arg == "-K")
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settings.keepFailed = true;
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else if (arg == "--keep-going" || arg == "-k")
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settings.keepGoing = true;
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else if (arg == "--fallback")
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settings.set("build-fallback", "true");
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else if (arg == "--max-jobs" || arg == "-j")
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settings.set("build-max-jobs", getArg(arg, i, args.end()));
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else if (arg == "--cores")
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settings.set("build-cores", getArg(arg, i, args.end()));
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else if (arg == "--readonly-mode")
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settings.readOnlyMode = true;
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else if (arg == "--max-silent-time")
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settings.set("build-max-silent-time", getArg(arg, i, args.end()));
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else if (arg == "--timeout")
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settings.set("build-timeout", getArg(arg, i, args.end()));
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else if (arg == "--no-build-hook")
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settings.useBuildHook = false;
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else if (arg == "--show-trace")
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settings.showTrace = true;
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else if (arg == "--no-gc-warning")
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gcWarning = false;
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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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settings.set(name, value);
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}
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else {
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if (!parseArg(i, args.end()))
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throw UsageError(format("unrecognised option ‘%1%’") % *i);
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}
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}
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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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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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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 (Exit & e) {
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return e.status;
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} catch (UsageError & e) {
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printMsg(lvlError,
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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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printMsg(lvlError, format(error + "%1%%2%") % (settings.showTrace ? e.prefix() : "") % e.msg());
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if (e.prefix() != "" && !settings.showTrace)
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printMsg(lvlError, "(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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printMsg(lvlError, error + "out of memory");
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return 1;
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} catch (std::exception & e) {
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printMsg(lvlError, 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, 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, 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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}
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