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60b7121d2c
We want to be able to write down `foo.drv^bar.drv^baz`:
`foo.drv^bar.drv` is the dynamic derivation (since it is itself a
derivation output, `bar.drv` from `foo.drv`).
To that end, we create `Single{Derivation,BuiltPath}` types, that are
very similar except instead of having multiple outputs (in a set or
map), they have a single one. This is for everything to the left of the
rightmost `^`.
`NixStringContextElem` has an analogous change, and now can reuse
`SingleDerivedPath` at the top level. In fact, if we ever get rid of
`DrvDeep`, `NixStringContextElem` could be replaced with
`SingleDerivedPath` entirely!
Important note: some JSON formats have changed.
We already can *produce* dynamic derivations, but we can't refer to them
directly. Today, we can merely express building or example at the top
imperatively over time by building `foo.drv^bar.drv`, and then with a
second nix invocation doing `<result-from-first>^baz`, but this is not
declarative. The ethos of Nix of being able to write down the full plan
everything you want to do, and then execute than plan with a single
command, and for that we need the new inductive form of these types.
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
#include "derived-path.hh"
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#include "realisation.hh"
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namespace nix {
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struct SingleBuiltPath;
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struct SingleBuiltPathBuilt {
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ref<SingleBuiltPath> drvPath;
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std::pair<std::string, StorePath> output;
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std::string to_string(const Store & store) const;
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static SingleBuiltPathBuilt parse(const Store & store, std::string_view, std::string_view);
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nlohmann::json toJSON(const Store & store) const;
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DECLARE_CMP(SingleBuiltPathBuilt);
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};
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using _SingleBuiltPathRaw = std::variant<
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DerivedPathOpaque,
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SingleBuiltPathBuilt
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>;
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struct SingleBuiltPath : _SingleBuiltPathRaw {
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using Raw = _SingleBuiltPathRaw;
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using Raw::Raw;
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using Opaque = DerivedPathOpaque;
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using Built = SingleBuiltPathBuilt;
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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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StorePath outPath() const;
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static SingleBuiltPath parse(const Store & store, std::string_view);
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nlohmann::json toJSON(const Store & store) const;
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};
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static inline ref<SingleBuiltPath> staticDrv(StorePath drvPath)
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{
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return make_ref<SingleBuiltPath>(SingleBuiltPath::Opaque { drvPath });
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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 'BuiltPath' for more an explanation.
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*/
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struct BuiltPathBuilt {
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ref<SingleBuiltPath> drvPath;
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std::map<std::string, StorePath> outputs;
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std::string to_string(const Store & store) const;
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static BuiltPathBuilt parse(const Store & store, std::string_view, std::string_view);
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nlohmann::json toJSON(const Store & store) const;
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DECLARE_CMP(BuiltPathBuilt);
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};
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using _BuiltPathRaw = std::variant<
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DerivedPath::Opaque,
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BuiltPathBuilt
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>;
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/**
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* A built path. Similar to a DerivedPath, but enriched with the corresponding
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* output path(s).
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*/
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struct BuiltPath : _BuiltPathRaw {
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using Raw = _BuiltPathRaw;
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using Raw::Raw;
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using Opaque = DerivedPathOpaque;
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using Built = BuiltPathBuilt;
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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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StorePathSet outPaths() const;
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RealisedPath::Set toRealisedPaths(Store & store) const;
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nlohmann::json toJSON(const Store & store) const;
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};
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typedef std::vector<BuiltPath> BuiltPaths;
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}
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