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90 lines
2.7 KiB
Nix
90 lines
2.7 KiB
Nix
{ lib, pkgs, ... }:
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let
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initrdLowerdir = pkgs.runCommand "initrd-lowerdir" { } ''
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mkdir -p $out
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echo "initrd" > $out/initrd.txt
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'';
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initrdLowerdir2 = pkgs.runCommand "initrd-lowerdir-2" { } ''
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mkdir -p $out
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echo "initrd2" > $out/initrd2.txt
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'';
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userspaceLowerdir = pkgs.runCommand "userspace-lowerdir" { } ''
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mkdir -p $out
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echo "userspace" > $out/userspace.txt
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'';
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userspaceLowerdir2 = pkgs.runCommand "userspace-lowerdir-2" { } ''
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mkdir -p $out
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echo "userspace2" > $out/userspace2.txt
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'';
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in
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{
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name = "writable-overlays";
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meta.maintainers = with lib.maintainers; [ nikstur ];
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nodes.machine = { config, pkgs, ... }: {
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boot.initrd.systemd.enable = true;
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boot.initrd.availableKernelModules = [ "overlay" ];
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virtualisation.fileSystems = {
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"/initrd-overlay" = {
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overlay = {
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lowerdir = [ initrdLowerdir ];
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upperdir = "/.rw-initrd-overlay/upper";
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workdir = "/.rw-initrd-overlay/work";
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};
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neededForBoot = true;
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};
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"/userspace-overlay" = {
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overlay = {
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lowerdir = [ userspaceLowerdir ];
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upperdir = "/.rw-userspace-overlay/upper";
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workdir = "/.rw-userspace-overlay/work";
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};
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};
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"/ro-initrd-overlay" = {
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overlay.lowerdir = [
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initrdLowerdir
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initrdLowerdir2
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];
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neededForBoot = true;
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};
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"/ro-userspace-overlay" = {
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overlay.lowerdir = [
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userspaceLowerdir
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userspaceLowerdir2
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];
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};
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};
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};
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testScript = ''
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machine.wait_for_unit("default.target")
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with subtest("Initrd overlay"):
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machine.wait_for_file("/initrd-overlay/initrd.txt", 5)
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machine.succeed("touch /initrd-overlay/writable.txt")
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machine.succeed("findmnt --kernel --types overlay /initrd-overlay")
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with subtest("Userspace overlay"):
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machine.wait_for_file("/userspace-overlay/userspace.txt", 5)
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machine.succeed("touch /userspace-overlay/writable.txt")
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machine.succeed("findmnt --kernel --types overlay /userspace-overlay")
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with subtest("Read only initrd overlay"):
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machine.wait_for_file("/ro-initrd-overlay/initrd.txt", 5)
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machine.wait_for_file("/ro-initrd-overlay/initrd2.txt", 5)
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machine.fail("touch /ro-initrd-overlay/not-writable.txt")
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machine.succeed("findmnt --kernel --types overlay /ro-initrd-overlay")
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with subtest("Read only userspace overlay"):
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machine.wait_for_file("/ro-userspace-overlay/userspace.txt", 5)
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machine.wait_for_file("/ro-userspace-overlay/userspace2.txt", 5)
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machine.fail("touch /ro-userspace-overlay/not-writable.txt")
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machine.succeed("findmnt --kernel --types overlay /ro-userspace-overlay")
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'';
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}
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