nixpkgs/maintainers/scripts/eval-release.nix

# Evaluate `release.nix' like Hydra would (i.e. call each job
# attribute with the expected `system' argument).  Too bad
# nix-instantiate can't to do this.

with import ../../pkgs/lib;

let
  trace = if builtins.getEnv "VERBOSE" == "1" then builtins.trace else (x: y: y);

  rel = removeAttrs (import ../../pkgs/top-level/release.nix { }) [ "tarball" "unstable" "xbursttools" ];

  # Add the ‘recurseForDerivations’ attribute to ensure that
  # nix-instantiate recurses into nested attribute sets.
  recurse = attrs:
    if (builtins.tryEval attrs).success then
      if isDerivation attrs 
      then
        if (builtins.tryEval attrs.outPath).success
        then attrs
        else { }
      else { recurseForDerivations = true; } // mapAttrs (n: v: recurse v) attrs
    else { };

in recurse rel