improve liminix-rebuild test

* make it executable
* improve robustness
* do't hardcode services.default (why did it do this?)

tests/min-copy-closure/configuration.nix

@@ -32,9 +32,5 @@ in {
     };
 
     rootfsType = "jffs2";
-    services.default = lib.mkForce (target {
-      name = "default";
-      contents = with config.services; [ loopback ntp defaultroute4 sshd dhcpv4 ];
-    });
   };
 }

tests/min-copy-closure/test-liminix-rebuild.sh

@@ -1,10 +1,11 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -v -i bash -p expect socat
+
 # This is a test for liminix-rebuild. It's not a CI test because
 # liminix-rebuild calls nix-build so won't run inside a derivation,
 # meaning you have to remember to run it manually when changing
 # liminix-rebuild
 
-# nix-shell -p  expect socat --run "sh ./tests/min-copy-closure/test-liminix-rebuild.sh "
-
 . tests/test-helpers.sh
 
 set -e

tests/min-copy-closure/wait-until-ready.expect

@@ -5,4 +5,9 @@ send "\r\n"
 expect {
        "# " { send "hostname\r\n" };
 }
-expect  "(none)"
+
+expect {
+    "(none)" {}
+    "liminix" {}
+    timeout { exit(1) }
+}