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populate is a program of its own, with a Nix library, in pkgs/populate,
which krops uses, and which doesn't use krops:
- default.nix builds the program, with nix-build there or callPackage,
as pkgs.populate-unwrapped.
- lib is populate's Nix library: the types of sources and the POSIX
types they use, evalSource, flakeFollows, hasGeneratedFlake, and
derivesFlake, taking nixpkgs' lib. krops' lib takes them from there,
so it provides them as before, and so does lib/types.
pkgs.populate, the function from populate's arguments to a script
running the program, is krops' own, in pkgs/krops/populate.nix, with
checks.nix next to it. It takes the program as populate-unwrapped,
which callPackage passes from the overlay; the flake, whose nixpkgs
lacks it, passes its own.
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pkgs/krops takes populate as an argument, which nixpkgs doesn't provide,
so evaluating any of the flake's lib attributes from pkgs/krops fails.
The flake passes its own populate.
The README describes using krops from a flake: writeDeploy and the other
functions from lib.<system>, evalSource and mkTarget from krops' lib
directory, and deploying with nix run --impure, because krops' lib
evaluates <nixpkgs/lib>, environment variables, and /etc/hostname.
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