nix-super/src/libexpr/tests
John Ericson 60b7121d2c Make the Derived Path family of types inductive for dynamic derivations
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>
2023-08-10 00:08:32 -04:00
..
value Make the Derived Path family of types inductive for dynamic derivations 2023-08-10 00:08:32 -04:00
derived-path.cc Make the Derived Path family of types inductive for dynamic derivations 2023-08-10 00:08:32 -04:00
error_traces.cc primops: lazy evaluation of replaceStrings replacements 2023-05-25 18:35:23 -04:00
json.cc Use std::set<StringContextElem> not PathSet for string contexts 2023-04-21 01:05:49 -04:00
libexpr.hh Backport SourcePath from the lazy-trees branch 2023-04-06 13:15:50 +02:00
local.mk Backport SourcePath from the lazy-trees branch 2023-04-06 13:15:50 +02:00
primops.cc Remove FormatOrString and remaining uses of format() 2023-03-02 15:57:54 +01:00
search-path.cc Clean up SearchPath 2023-07-09 23:22:22 -04:00
trivial.cc Allow unit test infra to be reused across libs' tests 2023-01-29 13:52:57 -05:00