Using --override-input fails trying to unpack source even if input has flake = false.

[vic]

Describe the bug

I have a flake where an input is a non-flake url.

inputs = {
    rust-manifest.url = "https://static.rust-lang.org/dist/channel-rust-1.85.0.toml";
    rust-manifest.flake = false;
}

when trying other rust releases via --override-input, nix will always try to unpack the fetched source,
even if the input itself was marked as being a non-flake.

~> nix run github:vic/gleam-nix --override-input rust-manifest "https://static.rust-lang.org/dist/channel-rust-1.75.0.toml"
error:
       … while updating the lock file of flake 'github:vic/gleam-nix/521bba4c6b810c2577d66092e271a190deef2e48?narHash=sha256-du5mAn8Ds9AnCdqhInrgEshSa9pvsMNWwPTW1%2BFjQBE%3D'

       … while updating the flake input 'rust-manifest'

       … while fetching the input 'https://static.rust-lang.org/dist/channel-rust-1.75.0.toml'

       error: Failed to open archive (Unrecognized archive format)

Steps To Reproduce

~> nix run github:vic/gleam-nix --override-input rust-manifest "https://static.rust-lang.org/dist/channel-rust-1.75.0.toml"

Expected behavior

Since nix already loads the flake definition when overriding an input, it should be aware of non-flake inputs and do not try to unpack those sources and simply download them into the store.

Metadata

~> nix-env --version
nix-env (Nix) 2.24.12
~> uname -a
Linux nargun 6.12.17 #1-NixOS SMP PREEMPT_DYNAMIC Thu Feb 27 12:30:24 UTC 2025 x86_64 GNU/Linux

Additional context

None

Checklist

• checked latest Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

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[vic]

If you think this is a valid issue and makes sense fixing it, I'd love to contribute a PR for it.

[Mic92]

Does this work?

nix run github:vic/gleam-nix --override-input rust-manifest "file+https://static.rust-lang.org/dist/channel-rust-1.75.0.toml"

[vic]

Nice! using file:https:// does work :)

Thank you, @Mic92 !