# Is it possible to override cargoSha256 in buildRustPackage?

**URL:** https://discourse.nixos.org/t/is-it-possible-to-override-cargosha256-in-buildrustpackage/4393
**Category:** Help
**Created:** [October 16, 2019, 1:07pm UTC](https://discourse.nixos.org/t/is-it-possible-to-override-cargosha256-in-buildrustpackage/4393 "2019-10-16T13:07:34Z")
**Posts on this page:** 1
**Showing post:** 6

<div class="post-metadata">

### Author: ![teutat3s](https://discourse.nixos.org/user_avatar/discourse.nixos.org/teutat3s/32/4144_2.png) [@teutat3s](https://discourse.nixos.org/u/teutat3s)
#### Post date: [February 2, 2022, 6:31pm UTC](https://discourse.nixos.org/t/is-it-possible-to-override-cargosha256-in-buildrustpackage/4393/6 "2022-02-02T18:31:01Z")

</div>

In case anybody tries to do this with flakes:

```auto
final: prev: {
  mdbook-multilang = prev.mdbook.overrideAttrs (oldAttrs: rec {
    pname = "mdbook";

    version = "pr1306";

    src = prev.fetchFromGitHub {
       owner = "Ruin0x11";
       repo = "mdBook";
       rev = "9d8147c52dd9d50047ba5b29e4af99f92577806e";
       sha256 = "sha256-gJnQKHssO2ChiT4d037Lncd7hiOa5uh756p8TzPzbgQ=";
     };

    cargoDeps = oldAttrs.cargoDeps.overrideAttrs (prev.lib.const {
      name = "${pname}-vendor.tar.gz";
      inherit src;
      outputHash = "sha256-QCEyl5FZqECYYb5eRm8mn+R6owt+CLQwCq/AMMPygE0=";
    });
  });
}

```

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