lix/src/nix/main.cc

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#include <algorithm>
#include "command.hh"
#include "common-args.hh"
#include "eval.hh"
#include "eval-settings.hh"
#include "globals.hh"
#include "legacy.hh"
#include "shared.hh"
#include "store-api.hh"
#include "filetransfer.hh"
#include "finally.hh"
#include "loggers.hh"
#include "markdown.hh"
#include <sys/types.h>
#include <sys/socket.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <netinet/in.h>
#include <nlohmann/json.hpp>
extern std::string chrootHelperName;
void chrootHelper(int argc, char * * argv);
namespace nix {
/* Check if we have a non-loopback/link-local network interface. */
static bool haveInternet()
{
struct ifaddrs * addrs;
if (getifaddrs(&addrs))
return true;
Finally free([&]() { freeifaddrs(addrs); });
for (auto i = addrs; i; i = i->ifa_next) {
if (!i->ifa_addr) continue;
if (i->ifa_addr->sa_family == AF_INET) {
if (ntohl(((sockaddr_in *) i->ifa_addr)->sin_addr.s_addr) != INADDR_LOOPBACK) {
return true;
}
} else if (i->ifa_addr->sa_family == AF_INET6) {
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if (!IN6_IS_ADDR_LOOPBACK(&((sockaddr_in6 *) i->ifa_addr)->sin6_addr) &&
!IN6_IS_ADDR_LINKLOCAL(&((sockaddr_in6 *) i->ifa_addr)->sin6_addr))
return true;
}
}
return false;
}
std::string programPath;
struct NixArgs : virtual MultiCommand, virtual MixCommonArgs
{
bool useNet = true;
bool refresh = false;
bool helpRequested = false;
bool showVersion = false;
NixArgs() : MultiCommand(RegisterCommand::getCommandsFor({})), MixCommonArgs("nix")
{
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categories.clear();
categories[catHelp] = "Help commands";
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categories[Command::catDefault] = "Main commands";
categories[catSecondary] = "Infrequently used commands";
categories[catUtility] = "Utility/scripting commands";
categories[catNixInstallation] = "Commands for upgrading or troubleshooting your Nix installation";
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addFlag({
.longName = "help",
.description = "Show usage information.",
.category = miscCategory,
.handler = {[this]() { this->helpRequested = true; }},
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});
addFlag({
.longName = "print-build-logs",
.shortName = 'L',
.description = "Print full build logs on standard error.",
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.category = loggingCategory,
.handler = {[&]() { logger->setPrintBuildLogs(true); }},
.experimentalFeature = Xp::NixCommand,
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});
addFlag({
.longName = "version",
.description = "Show version information.",
.category = miscCategory,
.handler = {[&]() { showVersion = true; }},
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});
addFlag({
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.longName = "offline",
.aliases = {"no-net"}, // FIXME: remove
.description = "Disable substituters and consider all previously downloaded files up-to-date.",
.category = miscCategory,
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.handler = {[&]() { useNet = false; }},
.experimentalFeature = Xp::NixCommand,
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});
addFlag({
.longName = "refresh",
.description = "Consider all previously downloaded files out-of-date.",
.category = miscCategory,
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.handler = {[&]() { refresh = true; }},
.experimentalFeature = Xp::NixCommand,
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});
}
std::map<std::string, std::vector<std::string>> aliases = {
{"add-to-store", {"store", "add-path"}},
{"cat-nar", {"nar", "cat"}},
{"cat-store", {"store", "cat"}},
{"copy-sigs", {"store", "copy-sigs"}},
{"dev-shell", {"develop"}},
{"diff-closures", {"store", "diff-closures"}},
{"dump-path", {"store", "dump-path"}},
{"hash-file", {"hash", "file"}},
{"hash-path", {"hash", "path"}},
{"ls-nar", {"nar", "ls"}},
{"ls-store", {"store", "ls"}},
{"make-content-addressable", {"store", "make-content-addressed"}},
{"optimise-store", {"store", "optimise"}},
{"ping-store", {"store", "ping"}},
{"sign-paths", {"store", "sign"}},
{"show-derivation", {"derivation", "show"}},
{"to-base16", {"hash", "to-base16"}},
{"to-base32", {"hash", "to-base32"}},
{"to-base64", {"hash", "to-base64"}},
{"verify", {"store", "verify"}},
};
bool aliasUsed = false;
Strings::iterator rewriteArgs(Strings & args, Strings::iterator pos) override
{
if (aliasUsed || command || pos == args.end()) return pos;
auto arg = *pos;
auto i = aliases.find(arg);
if (i == aliases.end()) return pos;
warn("'%s' is a deprecated alias for '%s'",
arg, concatStringsSep(" ", i->second));
pos = args.erase(pos);
for (auto j = i->second.rbegin(); j != i->second.rend(); ++j)
pos = args.insert(pos, *j);
aliasUsed = true;
return pos;
}
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std::string description() override
{
return "a tool for reproducible and declarative configuration management";
}
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std::string doc() override
{
return
#include "nix.md"
;
}
// Plugins may add new subcommands.
void pluginsInited() override
{
commands = RegisterCommand::getCommandsFor({});
}
std::string dumpCli()
{
auto res = nlohmann::json::object();
res["args"] = toJSON();
auto stores = nlohmann::json::object();
for (auto & implem : *Implementations::registered) {
auto storeConfig = implem.getConfig();
auto storeName = storeConfig->name();
auto & j = stores[storeName];
j["doc"] = storeConfig->doc();
j["settings"] = storeConfig->toJSON();
j["experimentalFeature"] = storeConfig->experimentalFeature();
}
res["stores"] = std::move(stores);
return res.dump();
}
};
/* Render the help for the specified subcommand to stdout using
lowdown. */
static void showHelp(std::vector<std::string> subcommand, NixArgs & toplevel)
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{
auto mdName = subcommand.empty() ? "nix" : fmt("nix3-%s", concatStringsSep("-", subcommand));
evalSettings.restrictEval = false;
evalSettings.pureEval = false;
EvalState state({}, openStore("dummy://"));
auto vGenerateManpage = state.allocValue();
state.eval(state.parseExprFromString(
#include "generate-manpage.nix.gen.hh"
, CanonPath::root), *vGenerateManpage);
auto vUtils = state.allocValue();
state.cacheFile(
CanonPath("/utils.nix"), CanonPath("/utils.nix"),
state.parseExprFromString(
#include "utils.nix.gen.hh"
, CanonPath::root),
*vUtils);
auto vDump = state.allocValue();
vDump->mkString(toplevel.dumpCli());
auto vRes = state.allocValue();
state.callFunction(*vGenerateManpage, *vDump, *vRes, noPos);
auto attr = vRes->attrs->get(state.symbols.create(mdName + ".md"));
if (!attr)
throw UsageError("Nix has no subcommand '%s'", concatStringsSep("", subcommand));
auto markdown = state.forceString(*attr->value, noPos, "while evaluating the lowdown help text");
RunPager pager;
std::cout << renderMarkdownToTerminal(markdown) << "\n";
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}
static NixArgs & getNixArgs(Command & cmd)
{
assert(cmd.parent);
MultiCommand * toplevel = cmd.parent;
while (toplevel->parent) toplevel = toplevel->parent;
return dynamic_cast<NixArgs &>(*toplevel);
}
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struct CmdHelp : Command
{
std::vector<std::string> subcommand;
CmdHelp()
{
expectArgs({
.label = "subcommand",
.handler = {&subcommand},
});
}
std::string description() override
{
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return "show help about `nix` or a particular subcommand";
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}
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std::string doc() override
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{
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return
#include "help.md"
;
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}
Category category() override { return catHelp; }
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void run() override
{
assert(parent);
MultiCommand * toplevel = parent;
while (toplevel->parent) toplevel = toplevel->parent;
showHelp(subcommand, getNixArgs(*this));
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}
};
static auto rCmdHelp = registerCommand<CmdHelp>("help");
struct CmdHelpStores : Command
{
std::string description() override
{
return "show help about store types and their settings";
}
std::string doc() override
{
return
#include "help-stores.md"
;
}
Category category() override { return catHelp; }
void run() override
{
showHelp({"help-stores"}, getNixArgs(*this));
}
};
static auto rCmdHelpStores = registerCommand<CmdHelpStores>("help-stores");
void mainWrapped(int argc, char * * argv)
{
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savedArgv = argv;
/* The chroot helper needs to be run before any threads have been
started. */
if (argc > 0 && argv[0] == chrootHelperName) {
chrootHelper(argc, argv);
return;
}
initNix();
initGC();
#if __linux__
if (getuid() == 0) {
try {
saveMountNamespace();
if (unshare(CLONE_NEWNS) == -1)
throw SysError("setting up a private mount namespace");
} catch (Error & e) { }
}
#endif
Finally f([] { logger->stop(); });
programPath = argv[0];
auto programName = std::string(baseNameOf(programPath));
if (argc > 1 && std::string_view(argv[1]) == "__build-remote") {
programName = "build-remote";
argv++; argc--;
}
{
auto legacy = (*RegisterLegacyCommand::commands)[programName];
if (legacy) return legacy(argc, argv);
}
evalSettings.pureEval = true;
setLogFormat("bar");
settings.verboseBuild = false;
if (isatty(STDERR_FILENO)) {
verbosity = lvlNotice;
} else {
verbosity = lvlInfo;
}
NixArgs args;
if (argc == 2 && std::string(argv[1]) == "__dump-cli") {
logger->cout(args.dumpCli());
return;
}
if (argc == 2 && std::string(argv[1]) == "__dump-language") {
experimentalFeatureSettings.experimentalFeatures = {
Xp::Flakes,
Xp::FetchClosure,
};
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evalSettings.pureEval = false;
EvalState state({}, openStore("dummy://"));
auto res = nlohmann::json::object();
res["builtins"] = ({
auto builtinsJson = nlohmann::json::object();
auto builtins = state.baseEnv.values[0]->attrs;
for (auto & builtin : *builtins) {
auto b = nlohmann::json::object();
if (!builtin.value->isPrimOp()) continue;
auto primOp = builtin.value->primOp;
if (!primOp->doc) continue;
b["arity"] = primOp->arity;
b["args"] = primOp->args;
b["doc"] = trim(stripIndentation(primOp->doc));
b["experimental-feature"] = primOp->experimentalFeature;
builtinsJson[state.symbols[builtin.name]] = std::move(b);
}
std::move(builtinsJson);
});
res["constants"] = ({
auto constantsJson = nlohmann::json::object();
for (auto & [name, info] : state.constantInfos) {
auto c = nlohmann::json::object();
if (!info.doc) continue;
c["doc"] = trim(stripIndentation(info.doc));
c["type"] = showType(info.type, false);
c["impure-only"] = info.impureOnly;
constantsJson[name] = std::move(c);
}
std::move(constantsJson);
});
logger->cout("%s", res);
return;
}
if (argc == 2 && std::string(argv[1]) == "__dump-xp-features") {
logger->cout(documentExperimentalFeatures().dump());
return;
}
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Finally printCompletions([&]()
{
if (completions) {
switch (completionType) {
case ctNormal:
logger->cout("normal"); break;
case ctFilenames:
logger->cout("filenames"); break;
case ctAttrs:
logger->cout("attrs"); break;
}
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for (auto & s : *completions)
logger->cout(s.completion + "\t" + trim(s.description));
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}
});
try {
args.parseCmdline(argvToStrings(argc, argv));
} catch (UsageError &) {
if (!args.helpRequested && !completions) throw;
}
if (args.helpRequested) {
std::vector<std::string> subcommand;
MultiCommand * command = &args;
while (command) {
if (command && command->command) {
subcommand.push_back(command->command->first);
command = dynamic_cast<MultiCommand *>(&*command->command->second);
} else
break;
}
showHelp(subcommand, args);
return;
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}
if (completions) {
args.completionHook();
return;
}
if (args.showVersion) {
printVersion(programName);
return;
}
if (!args.command)
throw UsageError("no subcommand specified");
experimentalFeatureSettings.require(
args.command->second->experimentalFeature());
if (args.useNet && !haveInternet()) {
warn("you don't have Internet access; disabling some network-dependent features");
args.useNet = false;
}
if (!args.useNet) {
// FIXME: should check for command line overrides only.
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if (!settings.useSubstitutes.overridden)
settings.useSubstitutes = false;
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if (!settings.tarballTtl.overridden)
settings.tarballTtl = std::numeric_limits<unsigned int>::max();
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if (!fileTransferSettings.tries.overridden)
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fileTransferSettings.tries = 0;
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if (!fileTransferSettings.connectTimeout.overridden)
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fileTransferSettings.connectTimeout = 1;
}
if (args.refresh) {
settings.tarballTtl = 0;
settings.ttlNegativeNarInfoCache = 0;
settings.ttlPositiveNarInfoCache = 0;
}
if (args.command->second->forceImpureByDefault() && !evalSettings.pureEval.overridden) {
evalSettings.pureEval = false;
}
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args.command->second->run();
}
}
int main(int argc, char * * argv)
{
// Increase the default stack size for the evaluator and for
// libstdc++'s std::regex.
nix::setStackSize(64 * 1024 * 1024);
return nix::handleExceptions(argv[0], [&]() {
nix::mainWrapped(argc, argv);
});
}