flake.nix: nix-src and determinate doesn't follow the same nixpkgs

[Malix-Labs]

nix-src doesn't follow the same nixpkgs input than determinate flake

[malix@nixos:~/Repositories/Malix_Labs/dotfiles/nix]$ nix flake metadata github:DeterminateSystems/determinate
Resolved URL:  github:DeterminateSystems/determinate
Locked URL:    github:DeterminateSystems/determinate/a3becf5149650592a821daeb2b63d26597506652
Description:   Determinate
Revision:      a3becf5149650592a821daeb2b63d26597506652
Last modified: 2025-10-09 19:56:40
Fingerprint:   94f7d0113b7595261023111ec967599e9c925261ec7086a9ae5231785f1d6e68
Inputs:
├───determinate-nixd-aarch64-darwin: https://install.determinate.systems/determinate-nixd/tag/v3.11.3/macOS?narHash=sha256-Nug8jpanW4BbUfzq508ZWtCG24YGvyO8AOeTAyDMOKQ%3D
├───determinate-nixd-aarch64-linux: https://install.determinate.systems/determinate-nixd/tag/v3.11.3/aarch64-linux?narHash=sha256-kRAuNurPaJBhuOq1SpcCBmDOqCXvGDMKuMAb5vJRqtk%3D
├───determinate-nixd-x86_64-darwin follows input 'determinate-nixd-aarch64-darwin'
├───determinate-nixd-x86_64-linux: https://install.determinate.systems/determinate-nixd/tag/v3.11.3/x86_64-linux?narHash=sha256-7AF8O33I/xlMengDU6tHvmPVvXJZF7XQEdAbjfTPJ6s%3D
├───nix: https://api.flakehub.com/f/pinned/DeterminateSystems/nix-src/3.11.3/0199c9f4-3aa1-723c-a5e0-be7fb957ff9f/source.tar.gz?narHash=sha256-1aMQb%2BeSrGDbTrX7PvtpD142CniIvKFxej9hZxBWeMY%3D (2025-10-09 16:32:07)
│   ├───flake-parts: https://api.flakehub.com/f/pinned/hercules-ci/flake-parts/0.1.377%2Brev-49f0870db23e8c1ca0b5259734a02cd9e1e371a1/01972f28-554a-73f8-91f4-d488cc502f08/source.tar.gz?narHash=sha256-F82%2BgS044J1APL0n4hH50GYdPRv/5JWm34oCJYmVKdE%3D (2025-06-01 23:38:36)
│   │   └───nixpkgs-lib follows input 'nix/nixpkgs'
│   ├───git-hooks-nix: https://api.flakehub.com/f/pinned/cachix/git-hooks.nix/0.1.1026%2Brev-80479b6ec16fefd9c1db3ea13aeb038c60530f46/0196d79a-1b35-7b8e-a021-c894fb62163d/source.tar.gz?narHash=sha256-2Y53NGIX2vxfie1rOW0Qb86vjRZ7ngizoo%2BbnXU9D9k%3D (2025-05-16 05:19:14)
│   │   ├───flake-compat: github:edolstra/flake-compat/0f9255e01c2351cc7d116c072cb317785dd33b33?narHash=sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U%3D (2023-10-04 13:37:54)
│   │   ├───gitignore follows input 'nix'
│   │   └───nixpkgs follows input 'nix/nixpkgs'
│   ├───nixpkgs: https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2505.808723%2Brev-b1b3291469652d5a2edb0becc4ef0246fff97a7c/0198daf7-011a-7703-95d7-57146e794342/source.tar.gz?narHash=sha256-wY1%2B2JPH0ZZC4BQefoZw/k%2B3%2BDowFyfOxv17CN/idKs%3D (2025-08-23 04:07:17)
│   ├───nixpkgs-23-11: github:NixOS/nixpkgs/a62e6edd6d5e1fa0329b8653c801147986f8d446?narHash=sha256-oamiKNfr2MS6yH64rUn99mIZjc45nGJlj9eGth/3Xuw%3D (2024-05-31 12:45:33)
│   └───nixpkgs-regression: github:NixOS/nixpkgs/215d4d0fd80ca5163643b03a33fde804a29cc1e2?narHash=sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw%3D (2022-01-24 19:20:45)
└───nixpkgs: https://api.flakehub.com/f/pinned/DeterminateSystems/nixpkgs-weekly/0.1.871443%2Brev-d7f52a7a640bc54c7bb414cca603835bf8dd4b10/0199bd2b-6c92-7223-94cf-69e43f5561ee/source.tar.gz?narHash=sha256-krgZxGAIIIKFJS%2BUB0l8do3sYUDWJc75M72tepmVMzE%3D (2025-10-05 02:43:53)

determinate/flake.nix

Line 5 in a3becf5

nix.url = "https://flakehub.com/f/DeterminateSystems/nix-src/*";

determinate/flake.nix

Line 6 in a3becf5

nixpkgs.url = "https://flakehub.com/f/DeterminateSystems/nixpkgs-weekly/0.1";

https://github.com/DeterminateSystems/nix-src/blob/80d3406e25c753bb5144bef45afe980e6a642c29/flake.nix#L4

Is that normal?

Wouldn't it also make nix-src download nixpkgs more than every week like what the determinate nixpkgs input does and then voids the purpose of saying determinate only upgrade nixpkgs weekly?

[Malix-Labs]

See comment from @grahamc :

We deliberately don't override nix's nixpkgs, since the version distributed by the determinate nix release has been validated by our CI flow.

Also another comment from @grahamc :

Another option would be having this flakes' nixpkg follow nix's nixpkgs?