193 lines
4.3 KiB
C++
193 lines
4.3 KiB
C++
#pragma once
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#include "args.hh"
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#include "common-eval-args.hh"
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#include "path.hh"
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namespace nix {
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extern std::string programPath;
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struct Value;
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class Bindings;
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class EvalState;
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struct Pos;
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class Store;
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/* A command that requires a Nix store. */
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struct StoreCommand : virtual Command
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{
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StoreCommand();
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void run() override;
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ref<Store> getStore();
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virtual ref<Store> createStore();
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virtual void run(ref<Store>) = 0;
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private:
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std::shared_ptr<Store> _store;
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};
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struct Buildable
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{
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std::optional<StorePath> drvPath;
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std::map<std::string, StorePath> outputs;
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};
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typedef std::vector<Buildable> Buildables;
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struct Installable
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{
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virtual ~Installable() { }
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virtual std::string what() = 0;
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virtual Buildables toBuildables()
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{
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throw Error("argument '%s' cannot be built", what());
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}
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Buildable toBuildable();
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virtual Value * toValue(EvalState & state)
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{
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throw Error("argument '%s' cannot be evaluated", what());
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}
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};
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struct SourceExprCommand : virtual Args, StoreCommand, MixEvalArgs
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{
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Path file;
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SourceExprCommand();
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/* Return a value representing the Nix expression from which we
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are installing. This is either the file specified by ‘--file’,
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or an attribute set constructed from $NIX_PATH, e.g. ‘{ nixpkgs
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= import ...; bla = import ...; }’. */
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Value * getSourceExpr(EvalState & state);
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ref<EvalState> getEvalState();
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private:
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std::shared_ptr<EvalState> evalState;
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Value * vSourceExpr = 0;
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};
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enum RealiseMode { Build, NoBuild, DryRun };
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/* A command that operates on a list of "installables", which can be
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store paths, attribute paths, Nix expressions, etc. */
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struct InstallablesCommand : virtual Args, SourceExprCommand
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{
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std::vector<std::shared_ptr<Installable>> installables;
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InstallablesCommand()
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{
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expectArgs("installables", &_installables);
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}
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void prepare() override;
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virtual bool useDefaultInstallables() { return true; }
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private:
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std::vector<std::string> _installables;
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};
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/* A command that operates on exactly one "installable" */
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struct InstallableCommand : virtual Args, SourceExprCommand
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{
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std::shared_ptr<Installable> installable;
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InstallableCommand()
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{
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expectArg("installable", &_installable);
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}
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void prepare() override;
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private:
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std::string _installable;
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};
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/* A command that operates on zero or more store paths. */
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struct StorePathsCommand : public InstallablesCommand
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{
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private:
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bool recursive = false;
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bool all = false;
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protected:
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RealiseMode realiseMode = NoBuild;
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public:
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StorePathsCommand(bool recursive = false);
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using StoreCommand::run;
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virtual void run(ref<Store> store, std::vector<StorePath> storePaths) = 0;
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void run(ref<Store> store) override;
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bool useDefaultInstallables() override { return !all; }
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};
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/* A command that operates on exactly one store path. */
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struct StorePathCommand : public InstallablesCommand
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{
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using StoreCommand::run;
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virtual void run(ref<Store> store, const StorePath & storePath) = 0;
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void run(ref<Store> store) override;
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};
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/* A helper class for registering commands globally. */
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struct RegisterCommand
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{
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static Commands * commands;
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RegisterCommand(const std::string & name,
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std::function<ref<Command>()> command)
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{
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if (!commands) commands = new Commands;
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commands->emplace(name, command);
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}
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};
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template<class T>
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static RegisterCommand registerCommand(const std::string & name)
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{
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return RegisterCommand(name, [](){ return make_ref<T>(); });
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}
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std::shared_ptr<Installable> parseInstallable(
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SourceExprCommand & cmd, ref<Store> store, const std::string & installable,
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bool useDefaultInstallables);
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Buildables build(ref<Store> store, RealiseMode mode,
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std::vector<std::shared_ptr<Installable>> installables);
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std::set<StorePath> toStorePaths(ref<Store> store, RealiseMode mode,
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std::vector<std::shared_ptr<Installable>> installables);
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StorePath toStorePath(ref<Store> store, RealiseMode mode,
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std::shared_ptr<Installable> installable);
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std::set<StorePath> toDerivations(ref<Store> store,
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std::vector<std::shared_ptr<Installable>> installables,
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bool useDeriver = false);
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/* Helper function to generate args that invoke $EDITOR on
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filename:lineno. */
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Strings editorFor(const Pos & pos);
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}
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