NIX_CONFIG variable ignores -extra options

[nrdxp]

Describe the bug

The NIX_CONFIG environmental variable can be used to set valid nix.conf values directly in the environment, which is awesome, but the values preprended with extra- don't work as they do in regular config files.

Steps To Reproduce

run NIX_CONFIG='extra-substituters = https://example.com' nix show-config

Expected behavior

It should work as it does elsewhere.

nix-env --version output

nix (Nix) 2.12.1

[dermetfan]

Works for me on 2.11.1:

❯ NIX_CONFIG='extra-substituters = https://example.com' nix show-config --json | jq -r .substituters.value[]
https://cache.nixos.org/
https://example.com

[nrdxp]

that's strange because I explicitly tried 2.11.1 to make sure it wasn't a regression

Now I can't reproduce it. There must have been some other factor at play 🤔

I'll close for now.

[ryan4yin]

Seems related to #9487