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{ pkgs, lib, callPackage, runCommand }:
# Documentation is in doc/builders/testers.chapter.md
{
testEqualDerivation = callPackage ./test-equal-derivation.nix { };
testVersion =
{ package,
command ? "${package.meta.mainProgram or package.pname or package.name} --version",
version ? package.version,
}: runCommand "${package.name}-test-version" { nativeBuildInputs = [ package ]; meta.timeout = 60; } ''
if output=$(${command} 2>&1); then
grep -Fw "${version}" - <<< "$output"
touch $out
else
echo "$output" >&2 && exit 1
fi
'';
# See doc/builders/testers.chapter.md or
# https://nixos.org/manual/nixpkgs/unstable/#tester-invalidateFetcherByDrvHash
invalidateFetcherByDrvHash = f: args:
let
drvPath = (f args).drvPath;
# It's safe to discard the context, because we don't access the path.
salt = builtins.unsafeDiscardStringContext (lib.substring 0 12 (baseNameOf drvPath));
# New derivation incorporating the original drv hash in the name
salted = f (args // { name = "${args.name or "source"}-salted-${salt}"; });
# Make sure we did change the derivation. If the fetcher ignores `name`,
# `invalidateFetcherByDrvHash` doesn't work.
checked =
if salted.drvPath == drvPath
then throw "invalidateFetcherByDrvHash: Adding the derivation hash to the fixed-output derivation name had no effect. Make sure the fetcher's name argument ends up in the derivation name. Otherwise, the fetcher will not be re-run when its implementation changes. This is important for testing."
else salted;
in checked;
}
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