nixpkgs/maintainers/scripts/eval-release.nix

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# Evaluate `release.nix' like Hydra would. Too bad nix-instantiate can't to do this.
let
inherit (import ../../lib) isDerivation mapAttrs;
trace = if builtins.getEnv "VERBOSE" == "1" then builtins.trace else (x: y: y);
rel = removeAttrs (import ../../pkgs/top-level/release.nix { }) [ "tarball" "unstable" ];
# Add the recurseForDerivations attribute to ensure that
# nix-instantiate recurses into nested attribute sets.
recurse = path: attrs:
if (builtins.tryEval attrs).success then
if isDerivation attrs
then
if (builtins.tryEval attrs.drvPath).success
then { inherit (attrs) name drvPath; }
else { failed = true; }
else if attrs == null then {}
else { recurseForDerivations = true; } //
mapAttrs (n: v: let path' = path ++ [n]; in trace path' (recurse path' v)) attrs
else { };
in recurse [] rel