nixos/modules/system/activation/top-level.nix: allow overriding system.name

The toplevel derivations of systems that have `networking.hostName`
set to `""` (because they want their hostname to be set by DHCP) used
to be all named
`nixos-system-unnamed-${config.system.nixos.label}`.
This makes them hard to distinguish.

A similar problem existed in NixOS tests where `vmName` is used in the
`testScript` to refer to the VM. It defaulted to the
`networking.hostName` which when set to `""` won't allow you to refer
to the machine from the `testScript`.

This commit makes the `system.name` configurable. It still defaults to:

```
if config.networking.hostName == ""
then "unnamed"
else config.networking.hostName;
```

but in case `networking.hostName` needs to be to `""` the
`system.name` can be set to a distinguishable name.

0 files changed, 0 insertions, 0 deletions