[Bug]: Build failure following "How To".

[neilg]

Current Behavior

Following the instructions at https://jupyenv.io/documentation/how-to/ leads to a build failure:

nix flake init --template github:tweag/jupyenv
nix run

leads to

evaluation warning: rustPlatform.fetchCargoTarball is deprecated in favor of rustPlatform.fetchCargoVendor.
                    If you are using buildRustPackage, try setting useFetchCargoVendor = true and regenerating cargoHash.
                    See the 25.05 release notes for more information.
error: hash mismatch in fixed-output derivation '/nix/store/9wn2wh7xwamdig9w7h7wvcdil39c1jjq-rpds-py-0.21.0-vendor.tar.gz.drv':
         specified: sha256-VOmMNEdKHrPKJzs+D735Y52y47MubPwLlfkvB7Glh14=
            got:    sha256-EDIJw2lZ5nhANTp8bdkkyeSMHD2btHZ+IeN2ROkJN9o=
error: 1 dependencies of derivation '/nix/store/1cv85v4cgsrdn12ihi484wwnssr0gxsi-python3.12-rpds-py-0.21.0.drv' failed to build
error: 1 dependencies of derivation '/nix/store/hvw8fc6vzafpqwbw6j4qivq74l8ki19h-python3-3.12.9-env.drv' failed to build
error: 1 dependencies of derivation '/nix/store/b52whimw7ich1qzdyyaz0wqi9hlkzc9v-chmod-python3-3.12.9-env.drv' failed to build
error: 1 dependencies of derivation '/nix/store/g14wk29ckz89jbyf6whsd600ylhzaizs-wrapper-chmod-python3-3.12.9-env.drv' failed to build

Expected Behavior

The command should complete successfully.

Steps To Reproduce

nix flake init --template github:tweag/jupyenv
nix run

OS

- system: `"x86_64-linux"`
 - host os: `Linux 6.13.3, NixOS, 25.05 (Warbler), 25.05.20250221.32fb99b`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.26.2`
 - channels(root): `"nixos-24.05"`
 - nixpkgs: `/nix/store/qc7n2v5yl42m2wq59f59ly6igiwljh11-source`

Version

Latest main: 55e42c3

Additional Context

I'm not sure if this output early in the build is relevant:

warning: ignoring untrusted substituter 'https://tweag-jupyter.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user

Relevant log output

[cryptism]

I found setting line 14 on flake.nix to:

  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";

fixed this. I'm not sure why it's dependent on the unstable version of nixpkgs by default, because obviously it's prey to situations exactly like this.

[malikwirin]

I found setting line 14 on flake.nix to:

  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";

fixed this. I'm not sure why it's dependent on the unstable version of nixpkgs by default, because obviously it's prey to situations exactly like this.

this input was not even used
solved the issue in #572