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{ lib, writeText, haskellPackages, cabal-install }:
(haskellPackages.shellFor {
packages = p: [ p.constraints p.cereal ];
# WARNING: When updating this, make sure that the libraries passed to
# `extraDependencies` are not actually transitive dependencies of libraries in
# `packages` above. We explicitly want to test that it is possible to specify
# `extraDependencies` that are not in the closure of `packages`.
extraDependencies = p: { libraryHaskellDepends = [ p.conduit ]; };
nativeBuildInputs = [ cabal-install ];
phases = [ "unpackPhase" "buildPhase" "installPhase" ];
unpackPhase = ''
sourceRoot=$(pwd)/scratch
mkdir -p "$sourceRoot"
cd "$sourceRoot"
tar -xf ${haskellPackages.constraints.src}
tar -xf ${haskellPackages.cereal.src}
cp ${writeText "cabal.project" "packages: constraints* cereal*"} cabal.project
'';
buildPhase = ''
export HOME=$(mktemp -d)
mkdir -p $HOME/.cabal
touch $HOME/.cabal/config
# Check that the extraDependencies.libraryHaskellDepends arg is correctly
# picked up. This uses ghci to interpret a small Haskell program that uses
# a package from extraDependencies.
ghci <<EOF
:set -XOverloadedStrings
:m + Conduit
runResourceT $ connect (yield "done") (sinkFile "outfile")
EOF
if [[ "done" != "$(cat outfile)" ]]; then
echo "ERROR: extraDependencies appear not to be available in the environment"
exit 1
fi
# Check packages arg
cabal v2-build --offline --verbose constraints cereal --ghc-options="-O0 -j$NIX_BUILD_CORES"
'';
installPhase = ''
touch $out
'';
}).overrideAttrs (oldAttrs: {
meta =
let
oldMeta = oldAttrs.meta or {};
oldMaintainers = oldMeta.maintainers or [];
additionalMaintainers = with lib.maintainers; [ cdepillabout ];
allMaintainers = oldMaintainers ++ additionalMaintainers;
in
oldMeta // {
maintainers = allMaintainers;
inherit (cabal-install.meta) platforms;
};
})
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