Add nixredo-gc

default.nix

@@ -7,7 +7,7 @@ stdenv.mkDerivation {
   buildernix = ./builder.nix;
   libnix = ./lib.nix;
 
-  files = [ ./nixredo ./nixredo-deps ./nixredo-whichdo ];
+  files = [ ./nixredo ./nixredo-deps ./nixredo-whichdo ./nixredo-gc ];
 
   installPhase = ''
     mkdir -p $out/bin

nixredo-gc

@@ -0,0 +1,3 @@
+#!/bin/sh
+[ "${NIXREDO_ROOT+x}" = x ] || { printf "$0 only runs for private a nix store. Set NIXREDO_ROOT to a non-empty value\n"; exit 127; }
+nix-store --store "${NIXREDO_ROOT}" --gc