source common.sh export NIX_BUILD_HOOK="build-hook.hook.sh" drvPath=$($TOP/src/nix-instantiate/nix-instantiate build-hook.nix) echo "derivation is $drvPath" outPath=$($TOP/src/nix-store/nix-store -quf "$drvPath") echo "output path is $outPath" text=$(cat "$outPath"/foobar) if test "$text" != "BARBAR"; then exit 1; fi