62e95d095d
Allow the user to disable overriding the fileSystems option with
virtualisation.fileSystems by setting
`virtualisation.fileSystems = lib.mkForce { };`.
With this change you can use the qemu-vm module to boot from an external
image that was not produced by the qemu-vm module itself. The user can
now re-use the modularly set fileSystems option instead of having to
reproduce it in virtualisation.fileSystems.
73 lines
2.1 KiB
Nix
73 lines
2.1 KiB
Nix
# Tests that you can boot from an external disk image with the qemu-vm module.
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# "External" here means that the image was not produced within the qemu-vm
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# module and relies on the fileSystems option also set outside the qemu-vm
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# module. Most notably, this tests that you can stop the qemu-vm module from
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# overriding fileSystems with virtualisation.fileSystems so you don't have to
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# replicate the previously set fileSystems in virtualisation.fileSystems.
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{ lib, ... }:
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let
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rootFslabel = "external";
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rootFsDevice = "/dev/disk/by-label/${rootFslabel}";
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externalModule = { config, lib, pkgs, ... }: {
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boot.loader.systemd-boot.enable = true;
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fileSystems = {
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"/".device = rootFsDevice;
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};
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system.build.diskImage = import ../lib/make-disk-image.nix {
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inherit config lib pkgs;
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label = rootFslabel;
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partitionTableType = "efi";
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format = "qcow2";
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bootSize = "32M";
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additionalSpace = "0M";
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copyChannel = false;
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};
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};
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in
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{
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name = "qemu-vm-external-disk-image";
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meta.maintainers = with lib.maintainers; [ nikstur ];
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nodes.machine = { config, lib, pkgs, ... }: {
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virtualisation.directBoot.enable = false;
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virtualisation.mountHostNixStore = false;
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virtualisation.useEFIBoot = true;
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# This stops the qemu-vm module from overriding the fileSystems option
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# with virtualisation.fileSystems.
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virtualisation.fileSystems = lib.mkForce { };
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imports = [ externalModule ];
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};
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testScript = { nodes, ... }: ''
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import os
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import subprocess
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import tempfile
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tmp_disk_image = tempfile.NamedTemporaryFile()
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subprocess.run([
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"${nodes.machine.virtualisation.qemu.package}/bin/qemu-img",
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"create",
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"-f",
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"qcow2",
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"-b",
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"${nodes.machine.system.build.diskImage}/nixos.qcow2",
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"-F",
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"qcow2",
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tmp_disk_image.name,
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])
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# Set NIX_DISK_IMAGE so that the qemu script finds the right disk image.
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os.environ['NIX_DISK_IMAGE'] = tmp_disk_image.name
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machine.succeed("findmnt --kernel --source ${rootFsDevice} --target /")
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'';
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}
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