nix repl ignores --override-input

[DavHau]

Describe the bug

When nix repl is called with experimental features flakes and nix-command, it ignores the --override-input argument.

Steps To Reproduce

grmpf@grmpf-nix /tmp> git clone https://github.com/numtide/srvos
grmpf@grmpf-nix /tmp> cd srvos/
grmpf@grmpf-nix /t/srvos (main)> nix repl --override-input nixpkgs nixpkgs/nixos-20.03
Welcome to Nix 2.13.1. Type :? for help.

nix-repl> :lf ./.
Added 15 variables.

nix-repl> inputs.nixpkgs.lib.nixpkgsVersion
trace: `lib.nixpkgsVersion` is deprecated, use `lib.version` instead!
"23.05pre-git"

Expected behavior

nix repl respecting --override-input

nix-env --version output
nix-env (Nix) 2.13.1

Additional context

Add any other context about the problem here.

Priorities

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[balsoft]

I think "respecting" in this case should mean "failing with an error". It doesn't make sense to have an override-input when no flake is being passed on the command line. Note that with repl-flake experimental feature it does work correctly:

❯ nix repl --extra-experimental-features 'repl-flake' ./projects/nix --override-input nixpkgs ./projects/nixpkgs
Welcome to Nix 2.14.0pre20230213_c205d10. Type :? for help.

warning: Git tree '/home/balsoft/projects/nix' is dirty
warning: Git tree '/home/balsoft/projects/nixpkgs' is dirty
warning: not writing modified lock file of flake 'git+file:///home/balsoft/projects/nix':
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/04a75b2eecc0acf6239acf9dd04485ff8d14f425' (2022-12-08)
  → 'git+file:///home/balsoft/projects/nixpkgs' (2023-03-14)
Loading installable 'git+file:///home/balsoft/projects/nix#'...
Added 6 variables.