nixpkgs/pkgs/build-support/rust/fetchcrate.nix

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{ lib, fetchzip, fetchurl }:
{ crateName ? args.pname
, pname ? null
# The `dl` field of the registry's index configuration
# https://doc.rust-lang.org/cargo/reference/registry-index.html#index-configuration
, registryDl ? "https://crates.io/api/v1/crates"
, version
, unpack ? true
, ...
} @ args:
assert pname == null || pname == crateName;
(if unpack then fetchzip else fetchurl) ({
name = "${crateName}-${version}.tar.gz";
url = "${registryDl}/${crateName}/${version}/download";
} // lib.optionalAttrs unpack {
extension = "tar.gz";
} // removeAttrs args [ "crateName" "pname" "registryDl" "version" "unpack" ])