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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>
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| release-notes.md | ||
| rl-0.5.md | ||
| rl-0.6.md | ||
| rl-0.7.md | ||
| rl-0.8.1.md | ||
| rl-0.8.md | ||
| rl-0.9.1.md | ||
| rl-0.9.2.md | ||
| rl-0.9.md | ||
| rl-0.10.1.md | ||
| rl-0.10.md | ||
| rl-0.11.md | ||
| rl-0.12.md | ||
| rl-0.13.md | ||
| rl-0.14.md | ||
| rl-0.15.md | ||
| rl-0.16.md | ||
| rl-1.0.md | ||
| rl-1.1.md | ||
| rl-1.2.md | ||
| rl-1.3.md | ||
| rl-1.4.md | ||
| rl-1.5.1.md | ||
| rl-1.5.2.md | ||
| rl-1.5.md | ||
| rl-1.6.1.md | ||
| rl-1.6.md | ||
| rl-1.7.md | ||
| rl-1.8.md | ||
| rl-1.9.md | ||
| rl-1.10.md | ||
| rl-1.11.10.md | ||
| rl-1.11.md | ||
| rl-2.0.md | ||
| rl-2.1.md | ||
| rl-2.2.md | ||
| rl-2.3.md | ||
| rl-2.4.md | ||
| rl-2.5.md | ||
| rl-2.6.md | ||
| rl-2.7.md | ||
| rl-2.8.md | ||
| rl-2.9.md | ||
| rl-2.10.md | ||
| rl-2.11.md | ||
| rl-2.12.md | ||
| rl-2.13.md | ||
| rl-2.14.md | ||
| rl-2.15.md | ||
| rl-2.16.md | ||
| rl-2.17.md | ||
| rl-next.md | ||