Extract the derivations closure from a flake

The concept of flake closure is not well defined (as far as I know), here I mean the union of all of the derivations in a flake outputs.

This flake provides a new utilty that, given a flake, returns a derivation that produces a file containing (and referencing!) all the derivations between outputs. Notice that the outputs names list, by default, contains the usual outputs (e.g. packages, devShells, checks, ...).

Also it will consider derivations only for a single fixed system which, by default, is the same from the package set where the utility is intanced.

For ease of implementation it ignores the case where these outputs contains attributes sets containing derivations i.e. it only considers derivations "at first level" like packages.x86_64-linux.hello.

Usage

Running

nix run github:aciceri/flake-closure

will show you a list of all the output paths for in the flake closure of the flake github:NixOS/patchelf.

You can use a different flake with the following the command:

nix run github:aciceri/flake-closure --override-input demo-flake "flakeRef"