528 lines
15 KiB
C++
528 lines
15 KiB
C++
#include "config.hh"
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#include "args.hh"
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#include "abstract-setting-to-json.hh"
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#include "experimental-features.hh"
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#include "util.hh"
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#include "file-system.hh"
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#include "config-impl.hh"
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#include <nlohmann/json.hpp>
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namespace nix {
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Config::Config(StringMap initials)
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: AbstractConfig(std::move(initials))
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{ }
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bool Config::set(const std::string & name, const std::string & value)
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{
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bool append = false;
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auto i = _settings.find(name);
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if (i == _settings.end()) {
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if (hasPrefix(name, "extra-")) {
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i = _settings.find(std::string(name, 6));
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if (i == _settings.end() || !i->second.setting->isAppendable())
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return false;
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append = true;
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} else
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return false;
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}
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i->second.setting->set(value, append);
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i->second.setting->overridden = true;
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return true;
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}
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void Config::addSetting(AbstractSetting * setting)
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{
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_settings.emplace(setting->name, Config::SettingData{false, setting});
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for (const auto & alias : setting->aliases)
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_settings.emplace(alias, Config::SettingData{true, setting});
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bool set = false;
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if (auto i = unknownSettings.find(setting->name); i != unknownSettings.end()) {
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setting->set(std::move(i->second));
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setting->overridden = true;
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unknownSettings.erase(i);
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set = true;
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}
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for (auto & alias : setting->aliases) {
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if (auto i = unknownSettings.find(alias); i != unknownSettings.end()) {
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if (set)
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warn("setting '%s' is set, but it's an alias of '%s' which is also set",
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alias, setting->name);
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else {
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setting->set(std::move(i->second));
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setting->overridden = true;
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unknownSettings.erase(i);
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set = true;
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}
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}
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}
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}
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AbstractConfig::AbstractConfig(StringMap initials)
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: unknownSettings(std::move(initials))
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{ }
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void AbstractConfig::warnUnknownSettings()
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{
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for (const auto & s : unknownSettings)
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warn("unknown setting '%s'", s.first);
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}
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void AbstractConfig::reapplyUnknownSettings()
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{
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auto unknownSettings2 = std::move(unknownSettings);
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unknownSettings = {};
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for (auto & s : unknownSettings2)
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set(s.first, s.second);
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}
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void Config::getSettings(std::map<std::string, SettingInfo> & res, bool overriddenOnly)
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{
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for (const auto & opt : _settings)
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if (!opt.second.isAlias && (!overriddenOnly || opt.second.setting->overridden))
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res.emplace(opt.first, SettingInfo{opt.second.setting->to_string(), opt.second.setting->description});
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}
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static void applyConfigInner(const std::string & contents, const std::string & path, std::vector<std::pair<std::string, std::string>> & parsedContents) {
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unsigned int pos = 0;
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while (pos < contents.size()) {
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std::string line;
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while (pos < contents.size() && contents[pos] != '\n')
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line += contents[pos++];
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pos++;
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if (auto hash = line.find('#'); hash != line.npos)
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line = std::string(line, 0, hash);
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auto tokens = tokenizeString<std::vector<std::string>>(line);
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if (tokens.empty()) continue;
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if (tokens.size() < 2)
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throw UsageError("illegal configuration line '%1%' in '%2%'", line, path);
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auto include = false;
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auto ignoreMissing = false;
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if (tokens[0] == "include")
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include = true;
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else if (tokens[0] == "!include") {
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include = true;
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ignoreMissing = true;
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}
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if (include) {
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if (tokens.size() != 2)
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throw UsageError("illegal configuration line '%1%' in '%2%'", line, path);
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auto p = absPath(tokens[1], dirOf(path));
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if (pathExists(p)) {
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try {
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std::string includedContents = readFile(path);
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applyConfigInner(includedContents, p, parsedContents);
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} catch (SystemError &) {
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// TODO: Do we actually want to ignore this? Or is it better to fail?
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}
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} else if (!ignoreMissing) {
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throw Error("file '%1%' included from '%2%' not found", p, path);
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}
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continue;
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}
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if (tokens[1] != "=")
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throw UsageError("illegal configuration line '%1%' in '%2%'", line, path);
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std::string name = std::move(tokens[0]);
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auto i = tokens.begin();
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advance(i, 2);
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parsedContents.push_back({
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std::move(name),
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concatStringsSep(" ", Strings(i, tokens.end())),
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});
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};
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}
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void AbstractConfig::applyConfig(const std::string & contents, const std::string & path) {
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std::vector<std::pair<std::string, std::string>> parsedContents;
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applyConfigInner(contents, path, parsedContents);
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// First apply experimental-feature related settings
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for (const auto & [name, value] : parsedContents)
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if (name == "experimental-features" || name == "extra-experimental-features")
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set(name, value);
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// Then apply other settings
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for (const auto & [name, value] : parsedContents)
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if (name != "experimental-features" && name != "extra-experimental-features")
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set(name, value);
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}
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void Config::resetOverridden()
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{
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for (auto & s : _settings)
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s.second.setting->overridden = false;
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}
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nlohmann::json Config::toJSON()
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{
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auto res = nlohmann::json::object();
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for (const auto & s : _settings)
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if (!s.second.isAlias)
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res.emplace(s.first, s.second.setting->toJSON());
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return res;
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}
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std::string Config::toKeyValue()
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{
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std::string res;
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for (const auto & s : _settings)
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if (s.second.isAlias)
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res += fmt("%s = %s\n", s.first, s.second.setting->to_string());
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return res;
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}
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void Config::convertToArgs(Args & args, const std::string & category)
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{
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for (auto & s : _settings) {
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if (!s.second.isAlias)
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s.second.setting->convertToArg(args, category);
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}
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}
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AbstractSetting::AbstractSetting(
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const std::string & name,
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const std::string & description,
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const std::set<std::string> & aliases,
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std::optional<ExperimentalFeature> experimentalFeature)
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: name(name)
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, description(stripIndentation(description))
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, aliases(aliases)
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, experimentalFeature(std::move(experimentalFeature))
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{
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}
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AbstractSetting::~AbstractSetting()
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{
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// Check against a gcc miscompilation causing our constructor
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// not to run (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80431).
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assert(created == 123);
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}
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nlohmann::json AbstractSetting::toJSON()
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{
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return nlohmann::json(toJSONObject());
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}
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std::map<std::string, nlohmann::json> AbstractSetting::toJSONObject() const
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{
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std::map<std::string, nlohmann::json> obj;
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obj.emplace("description", description);
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obj.emplace("aliases", aliases);
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if (experimentalFeature)
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obj.emplace("experimentalFeature", *experimentalFeature);
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else
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obj.emplace("experimentalFeature", nullptr);
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return obj;
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}
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void AbstractSetting::convertToArg(Args & args, const std::string & category)
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{
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}
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bool AbstractSetting::isOverridden() const { return overridden; }
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template<> std::string BaseSetting<std::string>::parse(const std::string & str) const
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{
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return str;
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}
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template<> std::string BaseSetting<std::string>::to_string() const
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{
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return value;
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}
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template<> std::optional<std::string> BaseSetting<std::optional<std::string>>::parse(const std::string & str) const
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{
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if (str == "")
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return std::nullopt;
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else
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return { str };
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}
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template<> std::string BaseSetting<std::optional<std::string>>::to_string() const
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{
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return value ? *value : "";
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}
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template<> bool BaseSetting<bool>::parse(const std::string & str) const
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{
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if (str == "true" || str == "yes" || str == "1")
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return true;
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else if (str == "false" || str == "no" || str == "0")
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return false;
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else
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throw UsageError("Boolean setting '%s' has invalid value '%s'", name, str);
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}
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template<> std::string BaseSetting<bool>::to_string() const
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{
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return value ? "true" : "false";
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}
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template<> void BaseSetting<bool>::convertToArg(Args & args, const std::string & category)
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{
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args.addFlag({
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.longName = name,
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.description = fmt("Enable the `%s` setting.", name),
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.category = category,
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.handler = {[this] { override(true); }},
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.experimentalFeature = experimentalFeature,
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});
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args.addFlag({
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.longName = "no-" + name,
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.description = fmt("Disable the `%s` setting.", name),
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.category = category,
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.handler = {[this] { override(false); }},
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.experimentalFeature = experimentalFeature,
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});
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}
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template<> Strings BaseSetting<Strings>::parse(const std::string & str) const
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{
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return tokenizeString<Strings>(str);
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}
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template<> void BaseSetting<Strings>::appendOrSet(Strings newValue, bool append)
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{
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if (!append) value.clear();
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value.insert(value.end(), std::make_move_iterator(newValue.begin()),
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std::make_move_iterator(newValue.end()));
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}
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template<> std::string BaseSetting<Strings>::to_string() const
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{
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return concatStringsSep(" ", value);
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}
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template<> StringSet BaseSetting<StringSet>::parse(const std::string & str) const
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{
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return tokenizeString<StringSet>(str);
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}
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template<> void BaseSetting<StringSet>::appendOrSet(StringSet newValue, bool append)
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{
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if (!append) value.clear();
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value.insert(std::make_move_iterator(newValue.begin()), std::make_move_iterator(newValue.end()));
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}
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template<> std::string BaseSetting<StringSet>::to_string() const
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{
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return concatStringsSep(" ", value);
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}
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template<> std::set<ExperimentalFeature> BaseSetting<std::set<ExperimentalFeature>>::parse(const std::string & str) const
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{
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std::set<ExperimentalFeature> res;
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for (auto & s : tokenizeString<StringSet>(str)) {
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if (auto thisXpFeature = parseExperimentalFeature(s); thisXpFeature) {
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res.insert(thisXpFeature.value());
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if (thisXpFeature.value() == Xp::Flakes)
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res.insert(Xp::FetchTree);
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} else
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warn("unknown experimental feature '%s'", s);
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}
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return res;
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}
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template<> void BaseSetting<std::set<ExperimentalFeature>>::appendOrSet(std::set<ExperimentalFeature> newValue, bool append)
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{
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if (!append) value.clear();
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value.insert(std::make_move_iterator(newValue.begin()), std::make_move_iterator(newValue.end()));
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}
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template<> std::string BaseSetting<std::set<ExperimentalFeature>>::to_string() const
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{
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StringSet stringifiedXpFeatures;
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for (const auto & feature : value)
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stringifiedXpFeatures.insert(std::string(showExperimentalFeature(feature)));
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return concatStringsSep(" ", stringifiedXpFeatures);
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}
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template<> StringMap BaseSetting<StringMap>::parse(const std::string & str) const
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{
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StringMap res;
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for (const auto & s : tokenizeString<Strings>(str)) {
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if (auto eq = s.find_first_of('='); s.npos != eq)
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res.emplace(std::string(s, 0, eq), std::string(s, eq + 1));
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// else ignored
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}
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return res;
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}
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template<> void BaseSetting<StringMap>::appendOrSet(StringMap newValue, bool append)
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{
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if (!append) value.clear();
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value.insert(std::make_move_iterator(newValue.begin()), std::make_move_iterator(newValue.end()));
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}
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template<> std::string BaseSetting<StringMap>::to_string() const
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{
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return std::transform_reduce(value.cbegin(), value.cend(), std::string{},
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[](const auto & l, const auto &r) { return l + " " + r; },
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[](const auto & kvpair){ return kvpair.first + "=" + kvpair.second; });
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}
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template class BaseSetting<int>;
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template class BaseSetting<unsigned int>;
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template class BaseSetting<long>;
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template class BaseSetting<unsigned long>;
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template class BaseSetting<long long>;
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template class BaseSetting<unsigned long long>;
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template class BaseSetting<bool>;
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template class BaseSetting<std::string>;
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template class BaseSetting<Strings>;
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template class BaseSetting<StringSet>;
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template class BaseSetting<StringMap>;
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template class BaseSetting<std::set<ExperimentalFeature>>;
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static Path parsePath(const AbstractSetting & s, const std::string & str)
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{
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if (str == "")
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throw UsageError("setting '%s' is a path and paths cannot be empty", s.name);
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else
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return canonPath(str);
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}
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PathSetting::PathSetting(Config * options,
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const Path & def,
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const std::string & name,
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const std::string & description,
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const std::set<std::string> & aliases)
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: BaseSetting<Path>(def, true, name, description, aliases)
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{
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options->addSetting(this);
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}
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Path PathSetting::parse(const std::string & str) const
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{
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return parsePath(*this, str);
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}
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OptionalPathSetting::OptionalPathSetting(Config * options,
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const std::optional<Path> & def,
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const std::string & name,
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const std::string & description,
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const std::set<std::string> & aliases)
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: BaseSetting<std::optional<Path>>(def, true, name, description, aliases)
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{
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options->addSetting(this);
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}
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std::optional<Path> OptionalPathSetting::parse(const std::string & str) const
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{
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if (str == "")
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return std::nullopt;
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else
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return parsePath(*this, str);
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}
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void OptionalPathSetting::operator =(const std::optional<Path> & v)
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{
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this->assign(v);
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}
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bool GlobalConfig::set(const std::string & name, const std::string & value)
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{
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for (auto & config : *configRegistrations)
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if (config->set(name, value)) return true;
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unknownSettings.emplace(name, value);
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return false;
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}
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void GlobalConfig::getSettings(std::map<std::string, SettingInfo> & res, bool overriddenOnly)
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{
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for (auto & config : *configRegistrations)
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config->getSettings(res, overriddenOnly);
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}
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void GlobalConfig::resetOverridden()
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{
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for (auto & config : *configRegistrations)
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config->resetOverridden();
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}
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nlohmann::json GlobalConfig::toJSON()
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{
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auto res = nlohmann::json::object();
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for (const auto & config : *configRegistrations)
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res.update(config->toJSON());
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return res;
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}
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std::string GlobalConfig::toKeyValue()
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{
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std::string res;
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std::map<std::string, Config::SettingInfo> settings;
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globalConfig.getSettings(settings);
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for (const auto & s : settings)
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res += fmt("%s = %s\n", s.first, s.second.value);
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return res;
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}
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void GlobalConfig::convertToArgs(Args & args, const std::string & category)
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{
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for (auto & config : *configRegistrations)
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config->convertToArgs(args, category);
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}
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GlobalConfig globalConfig;
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GlobalConfig::ConfigRegistrations * GlobalConfig::configRegistrations;
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GlobalConfig::Register::Register(Config * config)
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{
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if (!configRegistrations)
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configRegistrations = new ConfigRegistrations;
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configRegistrations->emplace_back(config);
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}
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ExperimentalFeatureSettings experimentalFeatureSettings;
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static GlobalConfig::Register rSettings(&experimentalFeatureSettings);
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bool ExperimentalFeatureSettings::isEnabled(const ExperimentalFeature & feature) const
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{
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auto & f = experimentalFeatures.get();
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return std::find(f.begin(), f.end(), feature) != f.end();
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}
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void ExperimentalFeatureSettings::require(const ExperimentalFeature & feature) const
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{
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if (!isEnabled(feature))
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throw MissingExperimentalFeature(feature);
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}
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bool ExperimentalFeatureSettings::isEnabled(const std::optional<ExperimentalFeature> & feature) const
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{
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return !feature || isEnabled(*feature);
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}
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void ExperimentalFeatureSettings::require(const std::optional<ExperimentalFeature> & feature) const
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{
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if (feature) require(*feature);
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}
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}
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