depot/third_party/nixpkgs/nixos/tests/activation/etc-overlay-immutable.nix

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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;
time.timeZone = "Utc";
environment.etc = {
"mountpoint/.keep".text = "keep";
"filemount".text = "keep";
};
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("direct symlinks point to the target without indirection"):
assert machine.succeed("readlink -n /etc/localtime") == "/etc/zoneinfo/Utc"
with subtest("Correct mode on the source password files"):
assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/passwd") == "644\n"
assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/group") == "644\n"
assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/shadow") == "0\n"
assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/gshadow") == "0\n"
with subtest("Password files are symlinks to /var/lib/nixos/etc"):
assert machine.succeed("readlink -f /etc/passwd") == "/var/lib/nixos/etc/passwd\n"
assert machine.succeed("readlink -f /etc/group") == "/var/lib/nixos/etc/group\n"
assert machine.succeed("readlink -f /etc/shadow") == "/var/lib/nixos/etc/shadow\n"
assert machine.succeed("readlink -f /etc/gshadow") == "/var/lib/nixos/etc/gshadow\n"
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("mount -t tmpfs tmpfs /etc/mountpoint")
machine.succeed("touch /etc/mountpoint/extra-file")
machine.succeed("mount --bind /dev/null /etc/filemount")
machine.succeed("/run/current-system/specialisation/new-generation/bin/switch-to-configuration switch")
assert machine.succeed("cat /etc/newgen") == "newgen"
print(machine.succeed("findmnt /etc/mountpoint"))
print(machine.succeed("ls /etc/mountpoint"))
print(machine.succeed("stat /etc/mountpoint/extra-file"))
print(machine.succeed("findmnt /etc/filemount"))
'';
}