644 lines
21 KiB
C++
644 lines
21 KiB
C++
#include <nix/config.h> // for nix/globals.hh's reference to SYSTEM
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#include <exception> // for exception_ptr, current_exception
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#include <functional> // for function
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#include <iostream> // for operator<<, basic_ostream, ostrin...
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#include <iterator> // for next
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#include <list> // for _List_iterator
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#include <memory> // for allocator, unique_ptr, make_unique
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#include <new> // for operator new
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#include <nix/args.hh> // for argvToStrings, UsageError
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#include <nix/attr-path.hh> // for findAlongAttrPath
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#include <nix/attr-set.hh> // for Attr, Bindings, Bindings::iterator
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#include <nix/common-eval-args.hh> // for MixEvalArgs
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#include <nix/eval-inline.hh> // for EvalState::forceValue
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#include <nix/eval.hh> // for EvalState, initGC, operator<<
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#include <nix/globals.hh> // for initPlugins, Settings, settings
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#include <nix/nixexpr.hh> // for Pos
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#include <nix/shared.hh> // for getArg, LegacyArgs, printVersion
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#include <nix/store-api.hh> // for openStore
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#include <nix/symbol-table.hh> // for Symbol, SymbolTable
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#include <nix/types.hh> // for Error, Path, Strings, PathSet
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#include <nix/util.hh> // for absPath, baseNameOf
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#include <nix/value.hh> // for Value, Value::(anonymous), Value:...
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#include <string> // for string, operator+, operator==
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#include <utility> // for move
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#include <variant> // for get, holds_alternative, variant
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#include <vector> // for vector<>::iterator, vector
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#include "libnix-copy-paste.hh"
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using nix::absPath;
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using nix::Bindings;
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using nix::Error;
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using nix::EvalError;
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using nix::EvalState;
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using nix::Path;
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using nix::PathSet;
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using nix::Strings;
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using nix::Symbol;
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using nix::tAttrs;
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using nix::ThrownError;
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using nix::tLambda;
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using nix::tString;
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using nix::UsageError;
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using nix::Value;
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// An ostream wrapper to handle nested indentation
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class Out
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{
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public:
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class Separator
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{};
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const static Separator sep;
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enum LinePolicy
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{
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ONE_LINE,
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MULTI_LINE
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};
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explicit Out(std::ostream & ostream) : ostream(ostream), policy(ONE_LINE), writeSinceSep(true) {}
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Out(Out & o, const std::string & start, const std::string & end, LinePolicy policy);
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Out(Out & o, const std::string & start, const std::string & end, int count)
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: Out(o, start, end, count < 2 ? ONE_LINE : MULTI_LINE)
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{}
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Out(const Out &) = delete;
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Out(Out &&) = default;
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Out & operator=(const Out &) = delete;
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Out & operator=(Out &&) = delete;
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~Out() { ostream << end; }
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private:
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std::ostream & ostream;
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std::string indentation;
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std::string end;
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LinePolicy policy;
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bool writeSinceSep;
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template <typename T> friend Out & operator<<(Out & o, T thing);
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};
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template <typename T> Out & operator<<(Out & o, T thing)
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{
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if (!o.writeSinceSep && o.policy == Out::MULTI_LINE) {
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o.ostream << o.indentation;
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}
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o.writeSinceSep = true;
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o.ostream << thing;
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return o;
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}
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template <> Out & operator<<<Out::Separator>(Out & o, Out::Separator /* thing */)
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{
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o.ostream << (o.policy == Out::ONE_LINE ? " " : "\n");
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o.writeSinceSep = false;
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return o;
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}
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Out::Out(Out & o, const std::string & start, const std::string & end, LinePolicy policy)
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: ostream(o.ostream), indentation(policy == ONE_LINE ? o.indentation : o.indentation + " "),
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end(policy == ONE_LINE ? end : o.indentation + end), policy(policy), writeSinceSep(true)
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{
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o << start;
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*this << Out::sep;
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}
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// Stuff needed for evaluation
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struct Context
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{
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Context(EvalState & state, Bindings & autoArgs, Value optionsRoot, Value configRoot)
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: state(state), autoArgs(autoArgs), optionsRoot(optionsRoot), configRoot(configRoot),
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underscoreType(state.symbols.create("_type"))
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{}
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EvalState & state;
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Bindings & autoArgs;
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Value optionsRoot;
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Value configRoot;
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Symbol underscoreType;
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};
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Value evaluateValue(Context & ctx, Value & v)
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{
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ctx.state.forceValue(v);
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if (ctx.autoArgs.empty()) {
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return v;
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}
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Value called{};
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ctx.state.autoCallFunction(ctx.autoArgs, v, called);
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return called;
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}
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bool isOption(Context & ctx, const Value & v)
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{
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if (v.type != tAttrs) {
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return false;
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}
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const auto & actualType = v.attrs->find(ctx.underscoreType);
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if (actualType == v.attrs->end()) {
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return false;
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}
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try {
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Value evaluatedType = evaluateValue(ctx, *actualType->value);
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if (evaluatedType.type != tString) {
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return false;
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}
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return static_cast<std::string>(evaluatedType.string.s) == "option";
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} catch (Error &) {
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return false;
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}
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}
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// Add quotes to a component of a path.
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// These are needed for paths like:
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// fileSystems."/".fsType
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// systemd.units."dbus.service".text
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std::string quoteAttribute(const std::string & attribute)
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{
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if (isVarName(attribute)) {
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return attribute;
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}
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std::ostringstream buf;
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printStringValue(buf, attribute.c_str());
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return buf.str();
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}
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const std::string appendPath(const std::string & prefix, const std::string & suffix)
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{
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if (prefix.empty()) {
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return quoteAttribute(suffix);
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}
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return prefix + "." + quoteAttribute(suffix);
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}
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bool forbiddenRecursionName(std::string name) { return (!name.empty() && name[0] == '_') || name == "haskellPackages"; }
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void recurse(const std::function<bool(const std::string & path, std::variant<Value, std::exception_ptr>)> & f,
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Context & ctx, Value v, const std::string & path)
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{
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std::variant<Value, std::exception_ptr> evaluated;
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try {
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evaluated = evaluateValue(ctx, v);
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} catch (Error &) {
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evaluated = std::current_exception();
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}
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if (!f(path, evaluated)) {
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return;
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}
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if (std::holds_alternative<std::exception_ptr>(evaluated)) {
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return;
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}
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const Value & evaluated_value = std::get<Value>(evaluated);
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if (evaluated_value.type != tAttrs) {
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return;
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}
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for (const auto & child : evaluated_value.attrs->lexicographicOrder()) {
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if (forbiddenRecursionName(child->name)) {
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continue;
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}
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recurse(f, ctx, *child->value, appendPath(path, child->name));
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}
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}
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bool optionTypeIs(Context & ctx, Value & v, const std::string & soughtType)
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{
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try {
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const auto & typeLookup = v.attrs->find(ctx.state.sType);
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if (typeLookup == v.attrs->end()) {
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return false;
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}
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Value type = evaluateValue(ctx, *typeLookup->value);
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if (type.type != tAttrs) {
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return false;
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}
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const auto & nameLookup = type.attrs->find(ctx.state.sName);
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if (nameLookup == type.attrs->end()) {
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return false;
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}
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Value name = evaluateValue(ctx, *nameLookup->value);
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if (name.type != tString) {
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return false;
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}
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return name.string.s == soughtType;
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} catch (Error &) {
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return false;
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}
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}
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bool isAggregateOptionType(Context & ctx, Value & v)
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{
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return optionTypeIs(ctx, v, "attrsOf") || optionTypeIs(ctx, v, "listOf");
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}
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MakeError(OptionPathError, EvalError);
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Value getSubOptions(Context & ctx, Value & option)
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{
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Value getSubOptions = evaluateValue(ctx, *findAlongAttrPath(ctx.state, "type.getSubOptions", ctx.autoArgs, option));
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if (getSubOptions.type != tLambda) {
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throw OptionPathError("Option's type.getSubOptions isn't a function");
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}
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Value emptyString{};
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nix::mkString(emptyString, "");
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Value v;
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ctx.state.callFunction(getSubOptions, emptyString, v, nix::Pos{});
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return v;
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}
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// Carefully walk an option path, looking for sub-options when a path walks past
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// an option value.
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struct FindAlongOptionPathRet
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{
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Value option;
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std::string path;
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};
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FindAlongOptionPathRet findAlongOptionPath(Context & ctx, const std::string & path)
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{
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Strings tokens = parseAttrPath(path);
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Value v = ctx.optionsRoot;
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std::string processedPath;
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for (auto i = tokens.begin(); i != tokens.end(); i++) {
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const auto & attr = *i;
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try {
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bool lastAttribute = std::next(i) == tokens.end();
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v = evaluateValue(ctx, v);
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if (attr.empty()) {
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throw OptionPathError("empty attribute name");
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}
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if (isOption(ctx, v) && optionTypeIs(ctx, v, "submodule")) {
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v = getSubOptions(ctx, v);
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}
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if (isOption(ctx, v) && isAggregateOptionType(ctx, v)) {
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auto subOptions = getSubOptions(ctx, v);
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if (lastAttribute && subOptions.attrs->empty()) {
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break;
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}
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v = subOptions;
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// Note that we've consumed attr, but didn't actually use it. This is the path component that's looked
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// up in the list or attribute set that doesn't name an option -- the "root" in "users.users.root.name".
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} else if (v.type != tAttrs) {
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throw OptionPathError("Value is %s while a set was expected", showType(v));
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} else {
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const auto & next = v.attrs->find(ctx.state.symbols.create(attr));
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if (next == v.attrs->end()) {
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throw OptionPathError("Attribute not found", attr, path);
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}
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v = *next->value;
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}
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processedPath = appendPath(processedPath, attr);
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} catch (OptionPathError & e) {
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throw OptionPathError("At '%s' in path '%s': %s", attr, path, e.msg());
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}
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}
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return {v, processedPath};
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}
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// Calls f on all the option names at or below the option described by `path`.
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// Note that "the option described by `path`" is not trivial -- if path describes a value inside an aggregate
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// option (such as users.users.root), the *option* described by that path is one path component shorter
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// (eg: users.users), which results in f being called on sibling-paths (eg: users.users.nixbld1). If f
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// doesn't want these, it must do its own filtering.
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void mapOptions(const std::function<void(const std::string & path)> & f, Context & ctx, const std::string & path)
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{
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auto root = findAlongOptionPath(ctx, path);
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recurse(
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[f, &ctx](const std::string & path, std::variant<Value, std::exception_ptr> v) {
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bool isOpt = std::holds_alternative<std::exception_ptr>(v) || isOption(ctx, std::get<Value>(v));
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if (isOpt) {
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f(path);
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}
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return !isOpt;
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},
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ctx, root.option, root.path);
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}
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// Calls f on all the config values inside one option.
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// Simple options have one config value inside, like sound.enable = true.
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// Compound options have multiple config values. For example, the option
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// "users.users" has about 1000 config values inside it:
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// users.users.avahi.createHome = false;
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// users.users.avahi.cryptHomeLuks = null;
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// users.users.avahi.description = "`avahi-daemon' privilege separation user";
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// ...
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// users.users.avahi.openssh.authorizedKeys.keyFiles = [ ];
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// users.users.avahi.openssh.authorizedKeys.keys = [ ];
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// ...
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// users.users.avahi.uid = 10;
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// users.users.avahi.useDefaultShell = false;
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// users.users.cups.createHome = false;
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// ...
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// users.users.cups.useDefaultShell = false;
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// users.users.gdm = ... ... ...
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// users.users.messagebus = ... .. ...
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// users.users.nixbld1 = ... .. ...
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// ...
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// users.users.systemd-timesync = ... .. ...
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void mapConfigValuesInOption(
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const std::function<void(const std::string & path, std::variant<Value, std::exception_ptr> v)> & f,
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const std::string & path, Context & ctx)
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{
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Value * option;
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try {
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option = findAlongAttrPath(ctx.state, path, ctx.autoArgs, ctx.configRoot);
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} catch (Error &) {
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f(path, std::current_exception());
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return;
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}
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recurse(
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[f, ctx](const std::string & path, std::variant<Value, std::exception_ptr> v) {
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bool leaf = std::holds_alternative<std::exception_ptr>(v) || std::get<Value>(v).type != tAttrs ||
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ctx.state.isDerivation(std::get<Value>(v));
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if (!leaf) {
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return true; // Keep digging
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}
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f(path, v);
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return false;
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},
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ctx, *option, path);
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}
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std::string describeError(const Error & e) { return "«error: " + e.msg() + "»"; }
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void describeDerivation(Context & ctx, Out & out, Value v)
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{
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// Copy-pasted from nix/src/nix/repl.cc :(
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Bindings::iterator i = v.attrs->find(ctx.state.sDrvPath);
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PathSet pathset;
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try {
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Path drvPath = i != v.attrs->end() ? ctx.state.coerceToPath(*i->pos, *i->value, pathset) : "???";
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out << "«derivation " << drvPath << "»";
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} catch (Error & e) {
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out << describeError(e);
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}
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}
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Value parseAndEval(EvalState & state, const std::string & expression, const std::string & path)
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{
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Value v{};
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state.eval(state.parseExprFromString(expression, absPath(path)), v);
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return v;
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}
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void printValue(Context & ctx, Out & out, std::variant<Value, std::exception_ptr> maybeValue, const std::string & path);
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void printList(Context & ctx, Out & out, Value & v)
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{
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Out listOut(out, "[", "]", v.listSize());
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for (unsigned int n = 0; n < v.listSize(); ++n) {
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printValue(ctx, listOut, *v.listElems()[n], "");
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listOut << Out::sep;
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}
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}
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void printAttrs(Context & ctx, Out & out, Value & v, const std::string & path)
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{
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Out attrsOut(out, "{", "}", v.attrs->size());
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for (const auto & a : v.attrs->lexicographicOrder()) {
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std::string name = a->name;
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if (!forbiddenRecursionName(name)) {
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attrsOut << name << " = ";
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printValue(ctx, attrsOut, *a->value, appendPath(path, name));
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attrsOut << ";" << Out::sep;
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}
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}
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}
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void multiLineStringEscape(Out & out, const std::string & s)
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{
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int i;
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for (i = 1; i < s.size(); i++) {
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if (s[i - 1] == '$' && s[i] == '{') {
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out << "''${";
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i++;
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} else if (s[i - 1] == '\'' && s[i] == '\'') {
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out << "'''";
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i++;
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} else {
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out << s[i - 1];
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}
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}
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if (i == s.size()) {
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out << s[i - 1];
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}
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}
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void printMultiLineString(Out & out, const Value & v)
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{
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std::string s = v.string.s;
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Out strOut(out, "''", "''", Out::MULTI_LINE);
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std::string::size_type begin = 0;
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while (begin < s.size()) {
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std::string::size_type end = s.find('\n', begin);
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if (end == std::string::npos) {
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multiLineStringEscape(strOut, s.substr(begin, s.size() - begin));
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break;
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}
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multiLineStringEscape(strOut, s.substr(begin, end - begin));
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strOut << Out::sep;
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begin = end + 1;
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}
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}
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void printValue(Context & ctx, Out & out, std::variant<Value, std::exception_ptr> maybeValue, const std::string & path)
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{
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try {
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if (auto ex = std::get_if<std::exception_ptr>(&maybeValue)) {
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std::rethrow_exception(*ex);
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}
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Value v = evaluateValue(ctx, std::get<Value>(maybeValue));
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if (ctx.state.isDerivation(v)) {
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describeDerivation(ctx, out, v);
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} else if (v.isList()) {
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printList(ctx, out, v);
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} else if (v.type == tAttrs) {
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printAttrs(ctx, out, v, path);
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} else if (v.type == tString && std::string(v.string.s).find('\n') != std::string::npos) {
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printMultiLineString(out, v);
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} else {
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ctx.state.forceValueDeep(v);
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out << v;
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}
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} catch (ThrownError & e) {
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if (e.msg() == "The option `" + path + "' is used but not defined.") {
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// 93% of errors are this, and just letting this message through would be
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// misleading. These values may or may not actually be "used" in the
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// config. The thing throwing the error message assumes that if anything
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// ever looks at this value, it is a "use" of this value. But here in
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// nixos-option, we are looking at this value only to print it.
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// In order to avoid implying that this undefined value is actually
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// referenced, eat the underlying error message and emit "«not defined»".
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out << "«not defined»";
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} else {
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out << describeError(e);
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}
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} catch (Error & e) {
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out << describeError(e);
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}
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}
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void printConfigValue(Context & ctx, Out & out, const std::string & path, std::variant<Value, std::exception_ptr> v)
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{
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out << path << " = ";
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printValue(ctx, out, std::move(v), path);
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out << ";\n";
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}
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// Replace with std::starts_with when C++20 is available
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|
bool starts_with(const std::string & s, const std::string & prefix)
|
|
{
|
|
return s.size() >= prefix.size() &&
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|
std::equal(s.begin(), std::next(s.begin(), prefix.size()), prefix.begin(), prefix.end());
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|
}
|
|
|
|
void printRecursive(Context & ctx, Out & out, const std::string & path)
|
|
{
|
|
mapOptions(
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|
[&ctx, &out, &path](const std::string & optionPath) {
|
|
mapConfigValuesInOption(
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|
[&ctx, &out, &path](const std::string & configPath, std::variant<Value, std::exception_ptr> v) {
|
|
if (starts_with(configPath, path)) {
|
|
printConfigValue(ctx, out, configPath, v);
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|
}
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|
},
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|
optionPath, ctx);
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|
},
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|
ctx, path);
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|
}
|
|
|
|
void printAttr(Context & ctx, Out & out, const std::string & path, Value & root)
|
|
{
|
|
try {
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|
printValue(ctx, out, *findAlongAttrPath(ctx.state, path, ctx.autoArgs, root), path);
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|
} catch (Error & e) {
|
|
out << describeError(e);
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|
}
|
|
}
|
|
|
|
bool hasExample(Context & ctx, Value & option)
|
|
{
|
|
try {
|
|
findAlongAttrPath(ctx.state, "example", ctx.autoArgs, option);
|
|
return true;
|
|
} catch (Error &) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
void printOption(Context & ctx, Out & out, const std::string & path, Value & option)
|
|
{
|
|
out << "Value:\n";
|
|
printAttr(ctx, out, path, ctx.configRoot);
|
|
|
|
out << "\n\nDefault:\n";
|
|
printAttr(ctx, out, "default", option);
|
|
|
|
out << "\n\nType:\n";
|
|
printAttr(ctx, out, "type.description", option);
|
|
|
|
if (hasExample(ctx, option)) {
|
|
out << "\n\nExample:\n";
|
|
printAttr(ctx, out, "example", option);
|
|
}
|
|
|
|
out << "\n\nDescription:\n";
|
|
printAttr(ctx, out, "description", option);
|
|
|
|
out << "\n\nDeclared by:\n";
|
|
printAttr(ctx, out, "declarations", option);
|
|
|
|
out << "\n\nDefined by:\n";
|
|
printAttr(ctx, out, "files", option);
|
|
out << "\n";
|
|
}
|
|
|
|
void printListing(Out & out, Value & v)
|
|
{
|
|
out << "This attribute set contains:\n";
|
|
for (const auto & a : v.attrs->lexicographicOrder()) {
|
|
std::string name = a->name;
|
|
if (!name.empty() && name[0] != '_') {
|
|
out << name << "\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
void printOne(Context & ctx, Out & out, const std::string & path)
|
|
{
|
|
try {
|
|
auto result = findAlongOptionPath(ctx, path);
|
|
Value & option = result.option;
|
|
option = evaluateValue(ctx, option);
|
|
if (path != result.path) {
|
|
out << "Note: showing " << result.path << " instead of " << path << "\n";
|
|
}
|
|
if (isOption(ctx, option)) {
|
|
printOption(ctx, out, result.path, option);
|
|
} else {
|
|
printListing(out, option);
|
|
}
|
|
} catch (Error & e) {
|
|
std::cerr << "error: " << e.msg()
|
|
<< "\nAn error occurred while looking for attribute names. Are "
|
|
"you sure that '"
|
|
<< path << "' exists?\n";
|
|
}
|
|
}
|
|
|
|
int main(int argc, char ** argv)
|
|
{
|
|
bool recursive = false;
|
|
std::string path = ".";
|
|
std::string optionsExpr = "(import <nixpkgs/nixos> {}).options";
|
|
std::string configExpr = "(import <nixpkgs/nixos> {}).config";
|
|
std::vector<std::string> args;
|
|
|
|
struct MyArgs : nix::LegacyArgs, nix::MixEvalArgs
|
|
{
|
|
using nix::LegacyArgs::LegacyArgs;
|
|
};
|
|
|
|
MyArgs myArgs(nix::baseNameOf(argv[0]), [&](Strings::iterator & arg, const Strings::iterator & end) {
|
|
if (*arg == "--help") {
|
|
nix::showManPage("nixos-option");
|
|
} else if (*arg == "--version") {
|
|
nix::printVersion("nixos-option");
|
|
} else if (*arg == "-r" || *arg == "--recursive") {
|
|
recursive = true;
|
|
} else if (*arg == "--path") {
|
|
path = nix::getArg(*arg, arg, end);
|
|
} else if (*arg == "--options_expr") {
|
|
optionsExpr = nix::getArg(*arg, arg, end);
|
|
} else if (*arg == "--config_expr") {
|
|
configExpr = nix::getArg(*arg, arg, end);
|
|
} else if (!arg->empty() && arg->at(0) == '-') {
|
|
return false;
|
|
} else {
|
|
args.push_back(*arg);
|
|
}
|
|
return true;
|
|
});
|
|
|
|
myArgs.parseCmdline(nix::argvToStrings(argc, argv));
|
|
|
|
nix::initPlugins();
|
|
nix::initGC();
|
|
nix::settings.readOnlyMode = true;
|
|
auto store = nix::openStore();
|
|
auto state = std::make_unique<EvalState>(myArgs.searchPath, store);
|
|
|
|
Value optionsRoot = parseAndEval(*state, optionsExpr, path);
|
|
Value configRoot = parseAndEval(*state, configExpr, path);
|
|
|
|
Context ctx{*state, *myArgs.getAutoArgs(*state), optionsRoot, configRoot};
|
|
Out out(std::cout);
|
|
|
|
auto print = recursive ? printRecursive : printOne;
|
|
if (args.empty()) {
|
|
print(ctx, out, "");
|
|
}
|
|
for (const auto & arg : args) {
|
|
print(ctx, out, arg);
|
|
}
|
|
|
|
ctx.state.printStats();
|
|
|
|
return 0;
|
|
}
|