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stubs.nix
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stubs.nix
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{ config, lib, pkgs, ... }:
with lib;
let
stubType = types.submodule ({ name, ... }: {
options = {
name = mkOption {
type = types.str;
default = "dummy";
description = "The stub package name.";
};
outPath = mkOption {
type = types.nullOr types.str;
default = "@${name}@";
defaultText = literalExpression ''"@''${name}@"'';
};
version = mkOption {
type = types.nullOr types.str;
default = null;
defaultText = literalExpression "pkgs.\${name}.version or null";
};
buildScript = mkOption {
type = types.str;
default = defaultBuildScript;
};
};
});
defaultBuildScript = "mkdir $out";
dummyPackage = pkgs.runCommandLocal "dummy" { } defaultBuildScript;
mkStubPackage = { name ? "dummy", outPath ? null, version ? null
, buildScript ? defaultBuildScript }:
let
pkg = if name == "dummy" && buildScript == defaultBuildScript then
dummyPackage
else
pkgs.runCommandLocal name { pname = name; } buildScript;
in pkg // optionalAttrs (outPath != null) { inherit outPath; }
// optionalAttrs (version != null) { inherit version; };
in {
options.test.stubs = mkOption {
type = types.attrsOf stubType;
default = { };
description =
"Package attributes that should be replaced by a stub package.";
};
config = {
lib.test.mkStubPackage = mkStubPackage;
nixpkgs.overlays = mkIf (config.test.stubs != { }) [
(self: super:
mapAttrs (n: v:
mkStubPackage (v // optionalAttrs (v.version == null) {
version = super.${n}.version or null;
})) config.test.stubs)
];
};
}