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# Fetches a pre-built v8 build from GitHub.

#

# rusty_v8 is a bad citizen: it attempts to download a binary within its build.rs.

# When running in the Nix sandbox, this download fails, so the crate cannot build.

# We instead download the archive ahead of time using a Nix-friendly fetcher function,

# and in our flake.nix we'll reference it in an appropriate env var so the crate build finds it.

#

# From https://github.com/msfjarvis/crane_rusty_v8/blob/4e076af4edb396d9d9398013d4393ec8da49c841/librusty_v8.nix

# modified for our desired version

{

rust,

stdenv,

fetchurl,

}: let

arch = rust.toRustTarget stdenv.hostPlatform;

fetch_librusty_v8 = args:

fetchurl {

name = "librusty_v8-${args.version}";

url = "https://github.com/denoland/rusty_v8/releases/download/v${args.version}/librusty_v8_release_${arch}.a.gz";

sha256 = args.shas.${stdenv.hostPlatform.system};

meta = {inherit (args) version;};

};

in

fetch_librusty_v8 {

version = "145.0.0";

shas = {

x86_64-linux = "sha256-chV1PAx40UH3Ute5k3lLrgfhih39Rm3KqE+mTna6ysE=";

# I (pgoldman 2025-10-17) only use x86_64-linux, so I haven't filled in these hashes.

# If you use one of these platforms, run the build and wait for it to fail,

# copy the detected sha256 from the error message in here, then re-run.

aarch64-linux = "0000000000000000000000000000000000000000000000000000";

x86_64-darwin = "0000000000000000000000000000000000000000000000000000";

aarch64-darwin = "0000000000000000000000000000000000000000000000000000";

};

}