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6abbe725ca
The activation script that remounts the /etc overlay now handles other mount points on top of /etc by bind mounting them to the new temporary /etc overlay and then atomically revealing it.
50 lines
1.6 KiB
Nix
50 lines
1.6 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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};
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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("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("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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'';
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}
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