lib/call-machine: Introduce .build shortcut

The shortcut is mainly to make things a bit easier, instead of:

nix-build '<vuizvui/machines>' \
  -A aszlig.tishtushi.eval.config.system.build.toplevel

We can now do something like this:

nix-build '<vuizvui/machines>' \
  -A aszlig.tishtushi.build

... in order to get a system store path out of a machine definition.

This also fixes an evaluation error in the top-level default.nix. Thanks
to @Profpatsch for bringing this to my attention.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/call-machine.nix b/lib/call-machine.nix
index 95539114..0844e4eb 100644
--- a/lib/call-machine.nix
+++ b/lib/call-machine.nix
@@ -60,5 +60,6 @@ let
   }).vm;
 
 in {
+  build = eval.config.system.build.toplevel;
   inherit config eval iso vm;
 }