then you can do something like

rust-stable = (mkRustBin { } pkgs).stable.latest.default

then you can do something like

rust-stable = (mkRustBin { } pkgs).stable.latest.default;

i'm using crane to build dependencies and the finaly binary in two different steps.
after building the dependencies i'm exporting the closure using nix-store --export $(nix-store --query --requisites ./result).
since that doesn't include the cargo-deps-.drv-files and their outputs, when i run nix-store --import and building the final binary (on a different host for example) the final-binary-step builds them, creating double work.
when trying to export them as well, some of the drv-files aren't present:

export drvs=$(nix-store -q --requisites $(nix-store --query --deriver ./result/) | grep cargo-package)
export outputs$(nix-store -q --outputs $(nix-store -q --requisites $drvs)) # <- this errors since some of the drv-files aren't present in the nix store

how can i make sure to export all the drv-files and their outputs when exporting a nix store closure?

i'm using crane to build dependencies and the finaly binary in two different steps.
after building the dependencies i'm exporting the closure using nix-store --export $(nix-store --query --requisites ./result).
since that doesn't include the cargo-deps-.drv-files and their outputs, when i run nix-store --import and building the final binary (on a different host for example) the final-binary-step builds them, creating double work.
when trying to export them as well, some of the drv-files aren't present:

export drvs=$(nix-store -q --requisites $(nix-store --query --deriver ./result/) | grep cargo-package)
export outputs$(nix-store -q --outputs $(nix-store -q --requisites $drvs)) 
# the line above errors since some of the drv-files aren't present in the nix store,
# even though i'm running this after building the final closure successfully

how can i make sure to export all the drv-files and their outputs when exporting a nix store closure?

oh. actually i might not need the drvs, just their outputs:

deps=$(nix-store -r $(nix-store -q --requisites $(nix-store -q --deriver ./result/) | rg cargo-package))
final_closure=$(nix-store -q --requisites ./result/)
nix-store --export $deps $final_closure > /tmp/deps_and_final_closure

I am getting an error from a derivation I made. Specifically:

Executing cargoInstallPostBuildHook
cp: missing destination file operand after 'target/x86_64-unknown-linux-gnu/dev-tmp/'

Has anyone seen this before?

The derivation itself is pretty simple

{ pkgs, stdenv, rustPlatform, ... }:

let
fs = pkgs.lib.fileset;
src = fs.difference (fs.gitTracked ./.) (fs.unions [
  ./.gitignore
  ./flake.lock
  (fs.fileFilter (file: file.hasExt "nix") ./.)
]);
in
stdenv.mkDerivation (self: {
  cargoDeps = rustPlatform.importCargoLock {
    lockFile = ./Cargo.lock;
  };

  nativeBuildInputs = [
    rustPlatform.rust.rustc
    rustPlatform.rust.cargo
  ];

  cargoBuildType = "dev";
  buildInputs = let r = rustPlatform; in [
    r.cargoSetupHook
    r.cargoBuildHook
    r.cargoInstallHook
  ];

  name = let b = builtins; in (b.fromTOML (b.readFile ./Cargo.toml)).package.name;
  src = fs.toSource {
    root = ./.;
    fileset = src;
  };

  doCheck = false;
  meta.mainProgram = self.name;
})