Description of the Issue:

This is a django app I haven't updated in a year. I am working on updating everything and continuing development.

I think there is an issue with the version of nixpacks I am using or the way I have nixpacks set up in my files. I had not been using a railway.json file in the past with no issue but may need one?

Related discussions:

From other discussions I need to change a variable name or change the nixpacks version I am using? I could not figure out a clear solution.

https://help.railway.com/questions/error-attribute-dev-missing-this-w-34053210

https://help.railway.com/questions/error-while-trying-to-build-my-applicati-d91fcf23

https://docs.railway.com/reference/config-as-code#nixpacks-version

Appreciate the help and clarification

Complete log:

context: 0d0b6a4106b9dbcf5e845ff887e06788

╔══════════════════════════════ Nixpacks v1.31.0 ══════════════════════════════╗

║ setup │ python37, postgresql_16.dev, gcc ║

║──────────────────────────────────────────────────────────────────────────────║

║ install │ python -m venv --copies /opt/venv && . /opt/venv/bin/activate ║

║ │ && pip install -r requirements.txt ║

║──────────────────────────────────────────────────────────────────────────────║

║ start │ gunicorn foodetc.wsgi --log-file - --timeout 600 ║

╚══════════════════════════════════════════════════════════════════════════════╝

[internal] load build definition from Dockerfile

[internal] load build definition from Dockerfile

[internal] load build definition from Dockerfile

[internal] load build definition from Dockerfile

[internal] load metadata for ghcr.io/railwayapp/nixpacks:ubuntu-1736208272

[internal] load metadata for ghcr.io/railwayapp/nixpacks:ubuntu-1736208272

[internal] load .dockerignore

[internal] load .dockerignore

[internal] load .dockerignore

[internal] load .dockerignore

[internal] load build context

[internal] load build context

[internal] load build context

[stage-0 2/8] WORKDIR /app/

[stage-0 3/8] COPY .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix

[stage-0 3/8] COPY .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix

[stage-0 4/8] RUN nix-env -if .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix && nix-collect-garbage -d

unpacking 'https://github.com/NixOS/nixpkgs/archive/5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.tar.gz'; into the Git cache...

installing '5148520bfab61f99fd25fb9ff7bfbb50dad3c9db-env'

error:

… while calling the 'derivationStrict' builtin

at <nix/derivation-internal.nix>:34:12:

33|

34| strict = derivationStrict drvAttrs;

| ^

35|

… while evaluating derivation '5148520bfab61f99fd25fb9ff7bfbb50dad3c9db-env'

whose name attribute is located at /nix/store/lgcjj6s23v2203zyihsd0j26wh1saj0c-source/pkgs/stdenv/generic/make-derivation.nix:300:7

… while evaluating attribute 'passAsFile' of derivation '5148520bfab61f99fd25fb9ff7bfbb50dad3c9db-env'

at /nix/store/lgcjj6s23v2203zyihsd0j26wh1saj0c-source/pkgs/build-support/trivial-builders/default.nix:88:7:

87| inherit buildCommand name;

88| passAsFile = [ "buildCommand" ]

| ^

89| ++ (derivationArgs.passAsFile or []);

(stack trace truncated; use '--show-trace' to show the full, detailed trace)

error: attribute 'dev' missing

at /app/.nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix:19:13:

18| '')

19| gcc postgresql_16.dev python37

| ^

20| ];

Did you mean doc?

[stage-0 4/8] RUN nix-env -if .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix && nix-collect-garbage -d

Dockerfile:8

-------------------

6 |

7 | COPY .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix

8 | >>> RUN nix-env -if .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix && nix-collect-garbage -d

9 |

10 |

-------------------

ERROR: failed to solve: process "/bin/bash -ol pipefail -c nix-env -if .nixpacks/nixpkgs-5148520bfab61f99fd25fb9ff7bfbb50dad3c9db.nix && nix-collect-garbage -d" did not complete successfully: exit code: 1

Error: Docker build failed