core/pkgs/build-support/binary-cache/default.nix

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{ lib, stdenv, coreutils, jq, python3, nix, xz }:
# This function is for creating a flat-file binary cache, i.e. the kind created by
# nix copy --to file:///some/path and usable as a substituter (with the file:// prefix).
# For example, in the Nixpkgs repo:
# nix-build -E 'with import ./. {}; mkBinaryCache { rootPaths = [hello]; }'
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{ name ? "binary-cache", rootPaths }:
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stdenv.mkDerivation {
inherit name;
__structuredAttrs = true;
exportReferencesGraph.closure = rootPaths;
preferLocalBuild = true;
nativeBuildInputs = [ coreutils jq python3 nix xz ];
buildCommand = ''
mkdir -p $out/nar
python ${./make-binary-cache.py}
# These directories must exist, or Nix might try to create them in LocalBinaryCacheStore::init(),
# which fails if mounted read-only
mkdir $out/realisations
mkdir $out/debuginfo
mkdir $out/log
'';
}