feat(tvix/glue): support builtin:fetchurl r/8254

nixpkgs calls <nix/fetchurl.nix> during nixpkgs bootstrap.

This produces a fake derivation with system = builtin
and builder = builtin:fetchurl, and needs to download files from the
internet.

At the end of the Derivation construction, if we have such a derivation,
also synthesize a `Fetch` struct, which we add to the known fetch paths.

This will then cause these fetches to be picked up like all other
fetches in TvixStoreIO.

Change-Id: I72cbca4f85da106b25eda97693a6a6e59911cd57
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10975
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI

1 files changed, 2 insertions, 0 deletions

diff --git a/tvix/glue/src/lib.rs b/tvix/glue/src/lib.rs
index 2e5a3be103a1..a5dbdb8742fc 100644
--- a/tvix/glue/src/lib.rs
+++ b/tvix/glue/src/lib.rs
@@ -6,6 +6,8 @@ pub mod tvix_build;
 pub mod tvix_io;
 pub mod tvix_store_io;
 
+mod fetchurl;
+
 #[cfg(test)]
 mod tests;