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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>
39 lines
708 B
C++
39 lines
708 B
C++
#pragma once
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///@file
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#include <rapidcheck/gen/Arbitrary.h>
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#include <derived-path.hh>
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#include "tests/path.hh"
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#include "tests/outputs-spec.hh"
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namespace rc {
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using namespace nix;
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template<>
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struct Arbitrary<SingleDerivedPath::Opaque> {
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static Gen<SingleDerivedPath::Opaque> arbitrary();
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};
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template<>
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struct Arbitrary<SingleDerivedPath::Built> {
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static Gen<SingleDerivedPath::Built> arbitrary();
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};
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template<>
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struct Arbitrary<SingleDerivedPath> {
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static Gen<SingleDerivedPath> arbitrary();
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};
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template<>
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struct Arbitrary<DerivedPath::Built> {
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static Gen<DerivedPath::Built> arbitrary();
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};
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template<>
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struct Arbitrary<DerivedPath> {
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static Gen<DerivedPath> arbitrary();
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};
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}
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