How to use `devenv up` in pure eval mode?

[gabyx]

Currently I use a custom flake input "variable" devenv-root to not need --no-pure-eval (hack/workaround)

 nix develop --accept-flake-config --override-input devenv-root "path:.devenv/state/pwd" "./tools/nix#default"

Where in my flake I have defined these inputs

    # The devenv module to create good development shells.
    devenv = {
      url = "github:cachix/devenv";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    devenv-root = {
      url = "file+file:///dev/null";
      flake = false;
    };

and makeShell to do this

    inputs.devenv.lib.mkShell {
      modules = [
        (
          { ... }:
          {
            devenv.flakesIntegration = true;
            # This is currently needed for devenv to properly run in pure hermetic
            # mode while still being able to run processes & services and modify
            # (some parts) of the active shell.
            devenv.root = builtins.readFile inputs.devenv-root.outPath;
          }
        )
        ({ ... }: /* other stuff */)
      ];
    };

In .envrc I do this to write the .devenv/state/pwd file

# This is currently needed for devenv to properly run in pure hermetic
# mode while still being able to run processes & services and modify
# (some parts) of the active shell.mkdir -p .devenv/state
# See: https://github.com/cachix/devenv/issues/1461
if [ ! -f .devenv/state/pwd ] ||
    [ "$(pwd)" != "$(cat .devenv/state/pwd)" ]; then
    mkdir -p .devenv/state && pwd >.devenv/state/pwd
fi

use flake ./tools/nix#default \
    --override-input devenv-root "path:.devenv/state/pwd"

This works but devenv up does not work once inside the shell. It cannot find the rootDir because the devenv up tool apparently does not let me specify --override-input devenv-root to the underlying nix command it executes?
I can however run nix build --accept-flake-config --override-input devenv-root "path:.devenv/state/pwd" "./tools/nix#devenv-up" and then ./result.

But whats the right way to do this, or a correct workaround to lunch the processes in such a flake setup?

Would it be possible to add a forwarding of arguments to devenv up to the underlying nix command?Where do I need to look for such an enhancment?

[Aneeqasif]

have u found the workaround?

[gabyx]

@Aneeqasif : The devenv CLI in a flake seutp is a small wrapper around the real devenv executable and only provides basic functionality. Flake support is something in the future which will hopefully get better, etc.

I start the process compose with:

https://github.com/sdsc-ordes/quitsh/blob/main/pkg/exec/process-compose/compose.go#L67

where I get the process-compose config file from the installable ./tools/nix#mydevshell (pointing to a devshell)

https://github.com/sdsc-ordes/quitsh/blob/main/pkg/exec/process-compose/compose.go#L349

and then start this with process compose.