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{ stdenv, buildPackages }:
# 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]; }'
{ name ? "binary-cache"
, rootPaths
}:
stdenv.mkDerivation {
inherit name;
__structuredAttrs = true;
exportReferencesGraph.closure = rootPaths;
preferLocalBuild = true;
PATH = "${buildPackages.coreutils}/bin:${buildPackages.jq}/bin:${buildPackages.python3}/bin:${buildPackages.nix}/bin:${buildPackages.xz}/bin";
builder = builtins.toFile "builder" ''
. .attrs.sh
export out=''${outputs[out]}
mkdir $out
mkdir $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
'';
}
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