just diffing and triplet

justfile

@@ -21,3 +21,27 @@ update:
 
 cache:
 	devour-flake . | cachix push callumio-public
+
+_build host:
+    @nix build .#nixosConfigurations.{{host}}.config.system.build.toplevel --no-link --print-out-paths
+
+baseline:
+    @just _build artemis > /tmp/artemis.before
+    @just _build hermes  > /tmp/hermes.before
+    @echo "baseline saved:"
+    @echo "  artemis → $(cat /tmp/artemis.before)"
+    @echo "  hermes  → $(cat /tmp/hermes.before)"
+
+# baseline one host
+baseline-host host:
+    @just _build {{host}} > /tmp/{{host}}.before
+    @echo "{{host}} baseline → $(cat /tmp/{{host}}.before)"
+
+# diff one host against its saved baseline
+diff-host host:
+    @nvd diff $(cat /tmp/{{host}}.before) $(just _build {{host}})
+
+# diff both hosts
+diff:
+    @just diff-host artemis
+    @just diff-host hermes