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>
47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
#pragma once
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///@file
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#include "path.hh"
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#include "derived-path.hh"
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namespace nix {
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/**
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* This is a deprecated old type just for use by the old CLI, and older
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* versions of the RPC protocols. In new code don't use it; you want
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* `DerivedPath` instead.
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*
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* `DerivedPath` is better because it handles more cases, and does so more
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* explicitly without devious punning tricks.
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*/
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struct StorePathWithOutputs
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{
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StorePath path;
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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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DerivedPath toDerivedPath() const;
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typedef std::variant<StorePathWithOutputs, StorePath, std::monostate> ParseResult;
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static StorePathWithOutputs::ParseResult tryFromDerivedPath(const DerivedPath &);
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};
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std::vector<DerivedPath> toDerivedPaths(const std::vector<StorePathWithOutputs>);
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std::pair<std::string_view, StringSet> parsePathWithOutputs(std::string_view s);
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class Store;
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/**
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* Split a string specifying a derivation and a set of outputs
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* (/nix/store/hash-foo!out1,out2,...) into the derivation path
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* and the outputs.
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*/
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StorePathWithOutputs parsePathWithOutputs(const Store & store, std::string_view pathWithOutputs);
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StorePathWithOutputs followLinksToStorePathWithOutputs(const Store & store, std::string_view pathWithOutputs);
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}
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