feat(tvix/glue): Init fetcher builtins r/7557

Initialize a new empty builtins module `fetcher_builtins`, which will
contain the builtins which fetch URLs from the internet:

* fetchurl
* fetchGit
* fetchTarball
* fetchTree (maybe? this is experimental)

These builtins are all implemented in CPP nix at:
https://github.com/NixOS/nix/blob/2.20.2/src/libexpr/primops/fetchTree.cc

These builtins are added to the evaluation context using a similar
mechanism to the derivation builtins, and have been added everywhere
derivation builtins were previously being added.

Change-Id: I133b91cc9560f23028621414537f712e7bd8a825
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10974
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

1 files changed, 2 insertions, 1 deletions

diff --git a/tvix/glue/src/tvix_store_io.rs b/tvix/glue/src/tvix_store_io.rs
index a64e2d4c7bf0..025a8a4bf01c 100644
--- a/tvix/glue/src/tvix_store_io.rs
+++ b/tvix/glue/src/tvix_store_io.rs
@@ -475,7 +475,7 @@ mod tests {
     use tvix_eval::{EvalIO, EvaluationResult};
     use tvix_store::pathinfoservice::MemoryPathInfoService;
 
-    use crate::builtins::add_derivation_builtins;
+    use crate::builtins::{add_derivation_builtins, add_fetcher_builtins};
 
     use super::TvixStoreIO;
 
@@ -503,6 +503,7 @@ mod tests {
         let mut eval = tvix_eval::Evaluation::new(io.clone() as Rc<dyn EvalIO>, true);
 
         add_derivation_builtins(&mut eval, io.clone());
+        add_fetcher_builtins(&mut eval, io.clone());
 
         // run the evaluation itself.
         eval.evaluate(str, None)