error: … while calling the 'derivationStrict' builtin at «nix-internal»/derivation-internal.nix:37:12: 36| 37| strict = derivationStrict drvAttrs; | ^ 38| … while evaluating derivation 'rhwp-studio-0.7.17' whose name attribute is located at «github:NixOS/nixpkgs/9ae611a455b90cf061d8f332b977e387bda8e1ca?narHash=sha256-md8WlXOlfnIeHeOScMTTHFyf2d6iaTwPl2apR5EQ3P4%3D»/pkgs/stdenv/generic/make-derivation.nix:651:11 … while evaluating attribute 'preBuild' of derivation 'rhwp-studio-0.7.17' at /var/lib/nixbot/worktrees/52-2f8ea9b31e33-e907457f/packages/rhwp-studio/default.nix:18:3: 17| # cp'd from the store with read-only mode; chmod the parent before mkdir. 18| preBuild = '' | ^ 19| chmod -R u+w .. (stack trace truncated; use '--show-trace' to show the full, detailed trace) error: No hash was found while vendoring the git dependency svg2pdf-0.13.0. You can add a hash through the `outputHashes` argument of `importCargoLock`: outputHashes = { "svg2pdf-0.13.0" = ""; }; If you use `buildRustPackage`, you can add this attribute to the `cargoLock` attribute set.