forked from lix-project/lix
6fa690291a
This command upgrades Nix to the latest stable version by installing a store path obtained from https://github.com/NixOS/nixpkgs/raw/master/nixos/modules/installer/tools/nix-fallback-paths.nix which is the same store path that the installer at https://nixos.org/nix/install.sh uses. The upgrade fails if Nix is not installed in a profile (e.g. on NixOS, or when installed outside of the Nix store).
114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
#include <algorithm>
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#include "command.hh"
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#include "common-args.hh"
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#include "eval.hh"
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#include "globals.hh"
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#include "legacy.hh"
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#include "shared.hh"
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#include "store-api.hh"
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#include "progress-bar.hh"
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#include "finally.hh"
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extern std::string chrootHelperName;
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void chrootHelper(int argc, char * * argv);
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namespace nix {
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std::string programPath;
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struct NixArgs : virtual MultiCommand, virtual MixCommonArgs
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{
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NixArgs() : MultiCommand(*RegisterCommand::commands), MixCommonArgs("nix")
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{
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mkFlag()
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.longName("help")
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.shortName('h')
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.description("show usage information")
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.handler([&]() { showHelpAndExit(); });
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mkFlag()
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.longName("help-config")
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.description("show configuration options")
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.handler([&]() {
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std::cout << "The following configuration options are available:\n\n";
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Table2 tbl;
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for (const auto & s : settings._getSettings())
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if (!s.second.isAlias)
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tbl.emplace_back(s.first, s.second.setting->description);
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printTable(std::cout, tbl);
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throw Exit();
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});
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mkFlag()
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.longName("version")
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.description("show version information")
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.handler([&]() { printVersion(programName); });
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}
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void printFlags(std::ostream & out) override
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{
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Args::printFlags(out);
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std::cout <<
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"\n"
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"In addition, most configuration settings can be overriden using '--<name> <value>'.\n"
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"Boolean settings can be overriden using '--<name>' or '--no-<name>'. See 'nix\n"
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"--help-config' for a list of configuration settings.\n";
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}
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void showHelpAndExit()
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{
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printHelp(programName, std::cout);
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std::cout << "\nNote: this program is EXPERIMENTAL and subject to change.\n";
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throw Exit();
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}
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};
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void mainWrapped(int argc, char * * argv)
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{
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verbosity = lvlError;
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settings.verboseBuild = false;
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/* The chroot helper needs to be run before any threads have been
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started. */
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if (argc > 0 && argv[0] == chrootHelperName) {
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chrootHelper(argc, argv);
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return;
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}
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initNix();
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initGC();
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programPath = argv[0];
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string programName = baseNameOf(programPath);
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{
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auto legacy = (*RegisterLegacyCommand::commands)[programName];
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if (legacy) return legacy(argc, argv);
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}
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NixArgs args;
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args.parseCmdline(argvToStrings(argc, argv));
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if (!args.command) args.showHelpAndExit();
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Finally f([]() { stopProgressBar(); });
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if (isatty(STDERR_FILENO))
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startProgressBar();
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args.command->prepare();
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args.command->run();
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}
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}
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int main(int argc, char * * argv)
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{
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return nix::handleExceptions(argv[0], [&]() {
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nix::mainWrapped(argc, argv);
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});
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}
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