forked from lix-project/lix
130 lines
3.7 KiB
C++
130 lines
3.7 KiB
C++
#pragma once
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#include "util.hh"
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#include "path.hh"
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#include <optional>
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#include <nlohmann/json_fwd.hpp>
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namespace nix {
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class Store;
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/**
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* An opaque derived path.
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*
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* Opaque derived paths are just store paths, and fully evaluated. They
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* cannot be simplified further. Since they are opaque, they cannot be
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* built, but they can fetched.
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*/
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struct DerivedPathOpaque {
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StorePath path;
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nlohmann::json toJSON(ref<Store> store) const;
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std::string to_string(const Store & store) const;
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static DerivedPathOpaque parse(const Store & store, std::string_view);
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};
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/**
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* A derived path that is built from a derivation
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*
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* Built derived paths are pair of a derivation and some output names.
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* They are evaluated by building the derivation, and then replacing the
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* output names with the resulting outputs.
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*
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* Note that does mean a derived store paths evaluates to multiple
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* opaque paths, which is sort of icky as expressions are supposed to
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* evaluate to single values. Perhaps this should have just a single
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* output name.
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*/
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struct DerivedPathBuilt {
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StorePath drvPath;
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std::set<std::string> outputs;
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std::string to_string(const Store & store) const;
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static DerivedPathBuilt parse(const Store & store, std::string_view);
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};
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using _DerivedPathRaw = std::variant<
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DerivedPathOpaque,
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DerivedPathBuilt
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>;
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/**
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* A "derived path" is a very simple sort of expression that evaluates
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* to (concrete) store path. It is either:
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*
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* - opaque, in which case it is just a concrete store path with
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* possibly no known derivation
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*
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* - built, in which case it is a pair of a derivation path and an
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* output name.
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*/
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struct DerivedPath : _DerivedPathRaw {
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using Raw = _DerivedPathRaw;
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using Raw::Raw;
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using Opaque = DerivedPathOpaque;
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using Built = DerivedPathBuilt;
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inline const Raw & raw() const {
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return static_cast<const Raw &>(*this);
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}
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std::string to_string(const Store & store) const;
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static DerivedPath parse(const Store & store, std::string_view);
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};
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/**
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* A built derived path with hints in the form of optional concrete output paths.
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*
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* See 'DerivedPathWithHints' for more an explanation.
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*/
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struct DerivedPathWithHintsBuilt {
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StorePath drvPath;
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std::map<std::string, std::optional<StorePath>> outputs;
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nlohmann::json toJSON(ref<Store> store) const;
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static DerivedPathWithHintsBuilt parse(const Store & store, std::string_view);
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};
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using _DerivedPathWithHintsRaw = std::variant<
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DerivedPath::Opaque,
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DerivedPathWithHintsBuilt
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>;
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/**
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* A derived path with hints in the form of optional concrete output paths in the built case.
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*
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* This type is currently just used by the CLI. The paths are filled in
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* during evaluation for derivations that know what paths they will
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* produce in advanced, i.e. input-addressed or fixed-output content
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* addressed derivations.
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*
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* That isn't very good, because it puts floating content-addressed
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* derivations "at a disadvantage". It would be better to never rely on
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* the output path of unbuilt derivations, and exclusively use the
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* realizations types to work with built derivations' concrete output
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* paths.
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*/
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// FIXME Stop using and delete this, or if that is not possible move out of libstore to libcmd.
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struct DerivedPathWithHints : _DerivedPathWithHintsRaw {
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using Raw = _DerivedPathWithHintsRaw;
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using Raw::Raw;
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using Opaque = DerivedPathOpaque;
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using Built = DerivedPathWithHintsBuilt;
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inline const Raw & raw() const {
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return static_cast<const Raw &>(*this);
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}
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};
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typedef std::vector<DerivedPathWithHints> DerivedPathsWithHints;
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nlohmann::json derivedPathsWithHintsToJSON(const DerivedPathsWithHints & buildables, ref<Store> store);
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}
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