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Make the Derived Path family of types inductive for dynamic derivations

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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>
This commit is contained in:
John Ericson 2023-01-15 17:39:04 -05:00
parent d00fe5f225
commit 60b7121d2c
48 changed files with 1136 additions and 267 deletions
Download patch file Download diff file Expand all files Collapse all files

26
src/libexpr/tests/derived-path.cc
View file

@ -21,12 +21,12 @@ TEST_F(DerivedPathExpressionTest, force_init)
RC_GTEST_FIXTURE_PROP(
DerivedPathExpressionTest,
prop_opaque_path_round_trip,
(const DerivedPath::Opaque & o))
(const SingleDerivedPath::Opaque & o))
{
auto * v = state.allocValue();
state.mkStorePathString(o.path, *v);
auto d = state.coerceToDerivedPath(noPos, *v, "");
RC_ASSERT(DerivedPath { o } == d);
auto d = state.coerceToSingleDerivedPath(noPos, *v, "");
RC_ASSERT(SingleDerivedPath { o } == d);
}
// TODO use DerivedPath::Built for parameter once it supports a single output
@ -46,12 +46,12 @@ RC_GTEST_FIXTURE_PROP(
auto * v = state.allocValue();
state.mkOutputString(*v, drvPath, outputName.name, std::nullopt, mockXpSettings);
auto [d, _] = state.coerceToDerivedPathUnchecked(noPos, *v, "");
DerivedPath::Built b {
.drvPath = drvPath,
.outputs = OutputsSpec::Names { outputName.name },
auto [d, _] = state.coerceToSingleDerivedPathUnchecked(noPos, *v, "");
SingleDerivedPath::Built b {
.drvPath = makeConstantStorePathRef(drvPath),
.output = outputName.name,
};
RC_ASSERT(DerivedPath { b } == d);
RC_ASSERT(SingleDerivedPath { b } == d);
}
RC_GTEST_FIXTURE_PROP(
@ -61,12 +61,12 @@ RC_GTEST_FIXTURE_PROP(
{
auto * v = state.allocValue();
state.mkOutputString(*v, drvPath, outputName.name, outPath);
auto [d, _] = state.coerceToDerivedPathUnchecked(noPos, *v, "");
DerivedPath::Built b {
.drvPath = drvPath,
.outputs = OutputsSpec::Names { outputName.name },
auto [d, _] = state.coerceToSingleDerivedPathUnchecked(noPos, *v, "");
SingleDerivedPath::Built b {
.drvPath = makeConstantStorePathRef(drvPath),
.output = outputName.name,
};
RC_ASSERT(DerivedPath { b } == d);
RC_ASSERT(SingleDerivedPath { b } == d);
}
} /* namespace nix */