66 lines
2.5 KiB
Nix
66 lines
2.5 KiB
Nix
{ lib, ... }: {
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name = "activation-etc-overlay-immutable";
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meta.maintainers = with lib.maintainers; [ nikstur ];
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nodes.machine = { pkgs, ... }: {
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system.etc.overlay.enable = true;
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system.etc.overlay.mutable = false;
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# Prerequisites
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systemd.sysusers.enable = true;
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users.mutableUsers = false;
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boot.initrd.systemd.enable = true;
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boot.kernelPackages = pkgs.linuxPackages_latest;
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time.timeZone = "Utc";
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environment.etc = {
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"mountpoint/.keep".text = "keep";
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"filemount".text = "keep";
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};
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specialisation.new-generation.configuration = {
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environment.etc."newgen".text = "newgen";
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};
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};
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testScript = ''
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with subtest("/etc is mounted as an overlay"):
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machine.succeed("findmnt --kernel --type overlay /etc")
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with subtest("direct symlinks point to the target without indirection"):
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assert machine.succeed("readlink -n /etc/localtime") == "/etc/zoneinfo/Utc"
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with subtest("Correct mode on the source password files"):
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assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/passwd") == "644\n"
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assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/group") == "644\n"
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assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/shadow") == "0\n"
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assert machine.succeed("stat -c '%a' /var/lib/nixos/etc/gshadow") == "0\n"
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with subtest("Password files are symlinks to /var/lib/nixos/etc"):
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assert machine.succeed("readlink -f /etc/passwd") == "/var/lib/nixos/etc/passwd\n"
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assert machine.succeed("readlink -f /etc/group") == "/var/lib/nixos/etc/group\n"
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assert machine.succeed("readlink -f /etc/shadow") == "/var/lib/nixos/etc/shadow\n"
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assert machine.succeed("readlink -f /etc/gshadow") == "/var/lib/nixos/etc/gshadow\n"
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with subtest("switching to the same generation"):
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machine.succeed("/run/current-system/bin/switch-to-configuration test")
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with subtest("switching to a new generation"):
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machine.fail("stat /etc/newgen")
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machine.succeed("mount -t tmpfs tmpfs /etc/mountpoint")
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machine.succeed("touch /etc/mountpoint/extra-file")
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machine.succeed("mount --bind /dev/null /etc/filemount")
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machine.succeed("/run/current-system/specialisation/new-generation/bin/switch-to-configuration switch")
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assert machine.succeed("cat /etc/newgen") == "newgen"
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print(machine.succeed("findmnt /etc/mountpoint"))
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print(machine.succeed("ls /etc/mountpoint"))
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print(machine.succeed("stat /etc/mountpoint/extra-file"))
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print(machine.succeed("findmnt /etc/filemount"))
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'';
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}
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