`error: input 'nixpkgs-fmt/fenix/naersk' follows a non-existent input 'naersk'` about nixpkgs-fmt

[ocharles]

Here's a "repro" (ish):

[nix-shell:~/tmp]$ mkdir issue-257

[nix-shell:~/tmp]$ cd issue-257/

[nix-shell:~/tmp/issue-257]$ nix flake init

[nix-shell:~/tmp/issue-257]$ nvim flake.nix 

[nix-shell:~/tmp/issue-257]$ nix flake lock
error: source tree referenced by 'git+file:///home/ollie/tmp?dir=issue-257&ref=master&rev=8944c969d1ff3eb07e3f0c5e3a5db349a41e9d54' does not contain a 'issue-257/flake.nix' file

[nix-shell:~/tmp/issue-257]$ git init
Initialized empty Git repository in /home/ollie/tmp/issue-257/.git/

[nix-shell:~/tmp/issue-257]$ git add flake.nix 

[nix-shell:~/tmp/issue-257]$ cat flake.nix 
{
  description = "A very basic flake";

  inputs.nixpkgs-fmt.url = "github:nix-community/nixpkgs-fmt";

  outputs = { self, nixpkgs }: {

    packages.x86_64-linux.hello = nixpkgs.legacyPackages.x86_64-linux.hello;

    defaultPackage.x86_64-linux = self.packages.x86_64-linux.hello;

  };
}

[nix-shell:~/tmp/issue-257]$ nix flake lock
warning: Git tree '/home/ollie/tmp/issue-257' is dirty
error: input 'nixpkgs-fmt/fenix/naersk' follows a non-existent input 'naersk'
(use '--show-trace' to show detailed location information)

[nix-shell:~/tmp/issue-257]$ 

[zimbatm]

if I run nix run in the repo, I get:

$ nix run --show-trace
error: in pure evaluation mode, 'fetchTarball' requires a 'sha256' argument

       … while evaluating the file '/nix/store/d28xpy5rjhvy20p0dfdbvl68way34yg0-source/packages.nix':

Where the source is fenix.

Something is broken in flake land

[zimbatm]

fenix is loading flake-compat for some reason

[zimbatm]

Are you using the "follows" notation in your flake.nix?

I'm asking because the pinned version of fenix has naersk as a dependency, but not the latest one.

[figsoda]

fenix used to depend on naersk, but the dependency was removed here because of nix-community/naersk#184.

Removing this line should fix the issue:

nixpkgs-fmt/flake.nix

Line 8 in 35635d6

inputs.fenix.inputs.naersk.follows = "naersk";

[zimbatm]

What's weird is that nixpkgs-fmt pins an older version of fenix, and flake is not respecting that for some reason.

[ocharles]

What's weird is that nixpkgs-fmt pins an older version of fenix, and flake is not respecting that for some reason.

Yes, this is what puzzled me. I thought the whole point was because it worked at one point it should work now, but no such dice!

[tnytown]

I'm not exactly sure what's happening here, but adding naersk to my dependent flake fixes the issue, viz.

{
  inputs.naersk.url = "github:nix-community/naersk";
}

The flake then evaluates correctly and I can see all my flake inputs:

$ nix flake metadata
warning: Git tree '/home/tny/config' is dirty
Resolved URL:  git+file:///home/tny/config
Locked URL:    git+file:///home/tny/config
Description:   {system, home} configuration flake
Path:          /nix/store/bmz5kg2p1vi8gsn5qkdcs9y9c29lc0gc-source
Last modified: 2021-08-27 16:04:29
Inputs:
<snip>
├───nixpkgs-format: github:nix-community/nixpkgs-fmt/7849a089bd876dc9ddf529513d887593b9be059c
│   ├───fenix: github:nix-community/fenix/fffd864ad08ed95fcb66554513fa07a5f3d626b5
│   │   ├───naersk follows input 'naersk'
│   │   ├───nixpkgs follows input 'nixpkgs'
│   │   └───rust-analyzer-src: github:rust-analyzer/rust-analyzer/87ef340c19ae5ac73fc9b1cd37909d9d8ad53d09
│   ├───flake-utils: github:numtide/flake-utils/b543720b25df6ffdfcf9227afafc5b8c1fabfae8
│   ├───naersk: github:nmattia/naersk/a3f40fe42cc6d267ff7518fa3199e99ff1444ac4
│   │   └───nixpkgs follows input 'nixpkgs'
│   └───nixpkgs follows input 'nixpkgs'

The commit hash shown for fenix (nix-community/fenix@fffd864) seems to line up with the locked hash.

nixpkgs-fmt/flake.lock

Line 18 in 7849a08

"rev": "fffd864ad08ed95fcb66554513fa07a5f3d626b5",