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{ lib, ... }: {
name = "activation-etc-overlay-immutable";
meta.maintainers = with lib.maintainers; [ nikstur ];
nodes.machine = { pkgs, ... }: {
system.etc.overlay.enable = true;
system.etc.overlay.mutable = false;
# Prerequisites
systemd.sysusers.enable = true;
users.mutableUsers = false;
boot.initrd.systemd.enable = true;
boot.kernelPackages = pkgs.linuxPackages_latest;
specialisation.new-generation.configuration = {
environment.etc."newgen".text = "newgen";
};
};
testScript = ''
with subtest("/etc is mounted as an overlay"):
machine.succeed("findmnt --kernel --type overlay /etc")
with subtest("switching to the same generation"):
machine.succeed("/run/current-system/bin/switch-to-configuration test")
with subtest("switching to a new generation"):
machine.fail("stat /etc/newgen")
machine.succeed("/run/current-system/specialisation/new-generation/bin/switch-to-configuration switch")
assert machine.succeed("cat /etc/newgen") == "newgen"
'';
}
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