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