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{ lib, pkgs, ... }:
let
marker = "REACHED NON-NIXOS INIT AS PID 1";
# A non-NixOS init (no prepare-root). We use a store path, not literal
# /bin/sh: a fresh disk has no /bin/sh yet (it is created by the activation a
# non-NixOS init skips), while the store is always mounted; init=/bin/sh works
# the same on a real system. Writes a marker, then stays alive so PID 1 lives.
nonNixosInit = pkgs.writeShellScriptBin "non-nixos" ''
echo "${marker}" > /dev/console
exec ${pkgs.coreutils}/bin/sleep infinity
'';
common = {
boot.initrd.systemd.enable = true;
virtualisation = {
# tmpfs root, like real non-NixOS closure init= microvm consumers.
diskImage = null;
graphics = false;
};
# Speed up wait_for_console.
boot.consoleLogLevel = lib.mkForce 3;
boot.initrd.systemd.managerEnvironment.SYSTEMD_LOG_LEVEL = "warning";
# switch-root needs an os-release on the target root. A real system has one
# on disk; our fresh tmpfs does not, so create it.
boot.initrd.systemd.tmpfiles.settings."10-os-release"."/sysroot/etc/os-release".f = {
mode = "0644";
argument = "ID=test-non-nixos";
};
};
in
{
name = "systemd-initrd-non-nixos";
nodes = {
bashActivation = common;
nixosInit = {
imports = [ common ];
system.nixos-init.enable = true;
system.etc.overlay.enable = true;
services.userborn.enable = true;
};
};
testScript = ''
import os
# The last init= on the cmdline wins; QEMU_KERNEL_PARAMS is appended after
# the default one, so this boots our non-NixOS init.
os.environ["QEMU_KERNEL_PARAMS"] = "init=${lib.getExe nonNixosInit}"
start_all()
# If a code path does not skip the non-NixOS init, switch-root is blocked and
# the machine drops to emergency mode: the marker never appears and the wait
# times out.
with subtest("bash initrd-nixos-activation skips a non-NixOS init"):
bashActivation.wait_for_console_text("${marker}", timeout=300)
with subtest("nixos-init switches to a non-NixOS init directly"):
nixosInit.wait_for_console_text("${marker}", timeout=300)
'';
}
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