73 lines
2.7 KiB
Nix
73 lines
2.7 KiB
Nix
{ lib, ... }: {
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name = "activation-etc-overlay-mutable";
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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 = true;
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# Prerequisites
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boot.initrd.systemd.enable = true;
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boot.kernelPackages = pkgs.linuxPackages_latest;
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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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specialisation.newer-generation.configuration = {
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environment.etc."newergen".text = "newergen";
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};
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};
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testScript = /* python */ ''
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newergen = machine.succeed("realpath /run/current-system/specialisation/newer-generation/bin/switch-to-configuration").rstrip()
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with subtest("/run/etc-metadata/ is mounted"):
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print(machine.succeed("mountpoint /run/etc-metadata"))
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with subtest("No temporary files leaked into stage 2"):
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machine.succeed("[ ! -e /etc-metadata-image ]")
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machine.succeed("[ ! -e /etc-basedir ]")
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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("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("the initrd didn't get rebuilt"):
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machine.succeed("test /run/current-system/initrd -ef /run/current-system/specialisation/new-generation/initrd")
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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("echo -n 'mutable' > /etc/mutable")
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# Directory
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machine.succeed("mkdir /etc/mountpoint")
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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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# File
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machine.succeed("touch /etc/filemount")
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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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assert machine.succeed("cat /etc/mutable") == "mutable"
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print(machine.succeed("findmnt /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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machine.succeed(f"{newergen} switch")
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assert machine.succeed("cat /etc/newergen") == "newergen"
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tmpMounts = machine.succeed("find /tmp -maxdepth 1 -type d -regex '/tmp/nixos-etc\\..*' | wc -l").rstrip()
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metaMounts = machine.succeed("find /tmp -maxdepth 1 -type d -regex '/tmp/nixos-etc-metadata\\..*' | wc -l").rstrip()
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assert tmpMounts == "0", f"Found {tmpMounts} remaining tmpmounts"
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assert metaMounts == "1", f"Found {metaMounts} remaining metamounts"
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'';
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}
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