[defaults] Disable systemd emergency mode

roles/default.nix

@@ -31,6 +31,13 @@ with lib;
     };
     time.timeZone = "America/Los_Angeles";
 
+    # Don't go to emergency mode if we aren't able to mount filesystems.
+    # This is silly if you have multiple hard drives or partitions
+    # configured on a machine and then one goes away intentionally or
+    # unintentionally. If the system is already booting, let it continue
+    # to try and boot.
+    systemd.enableEmergencyMode = false;
+
     # Enable the OpenSSH daemon.
     services.openssh.enable = true;