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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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The filter for the program's sources took the paths it gets relative
to toString ./., which they needn't start with, e.g. if a symlink leads
to the directory, so nothing matched, and the build found no
Cargo.lock. It goes by the names of what it leaves out now: the Nix
files, the docs, .gitignore, and cargo's target directory.
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pkgs.populate takes implementation: "shell", the default, generates a
script from populate's arguments, and "rust" passes them as JSON to the
program in pkgs/populate, built from the crate there by program.nix.
The program checks the spec as checks.nix does during evaluation, with the
same messages, and reports that delivering sources isn't implemented yet.
rustProgram replaces the program, e.g. with one built some other way.
checks.nix holds the checks of populate's arguments during evaluation.
Both implementations check the names of sources and the target path with
it, and the Rust one's wrapper also checks drawing inputs, which the shell
implementation checks where it draws them.
nix-build tests --argstr implementation rust runs the scenarios with the
Rust implementation. They expect it to refuse copying flakes to targets
using sudo when it runs, not during evaluation, because only then it
decides whether the target is local.
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