diff options
author | nikstur <nikstur@outlook.com> | 2023-06-21 00:19:21 +0200 |
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committer | nikstur <nikstur@outlook.com> | 2023-10-02 11:13:26 +0200 |
commit | 62e95d095d38ceeb3d56614e33ca668907bdce54 (patch) | |
tree | c331d84b032271ce5b769671ae9f74ae7a3cd8a4 /nixos/tests/qemu-vm-external-disk-image.nix | |
parent | f902cb49892d300ff15cb237e48aa1cad79d68c3 (diff) |
nixos/qemu-vm: optionally disable overriding fileSystems
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.
Diffstat (limited to 'nixos/tests/qemu-vm-external-disk-image.nix')
-rw-r--r-- | nixos/tests/qemu-vm-external-disk-image.nix | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/nixos/tests/qemu-vm-external-disk-image.nix b/nixos/tests/qemu-vm-external-disk-image.nix new file mode 100644 index 0000000000000..a229fc5e39633 --- /dev/null +++ b/nixos/tests/qemu-vm-external-disk-image.nix @@ -0,0 +1,73 @@ +# Tests that you can boot from an external disk image with the qemu-vm module. +# "External" here means that the image was not produced within the qemu-vm +# module and relies on the fileSystems option also set outside the qemu-vm +# module. Most notably, this tests that you can stop the qemu-vm module from +# overriding fileSystems with virtualisation.fileSystems so you don't have to +# replicate the previously set fileSystems in virtualisation.fileSystems. + +{ lib, ... }: + +let + rootFslabel = "external"; + rootFsDevice = "/dev/disk/by-label/${rootFslabel}"; + + externalModule = { config, lib, pkgs, ... }: { + boot.loader.systemd-boot.enable = true; + + fileSystems = { + "/".device = rootFsDevice; + }; + + system.build.diskImage = import ../lib/make-disk-image.nix { + inherit config lib pkgs; + label = rootFslabel; + partitionTableType = "efi"; + format = "qcow2"; + bootSize = "32M"; + additionalSpace = "0M"; + copyChannel = false; + }; + }; +in +{ + name = "qemu-vm-external-disk-image"; + + meta.maintainers = with lib.maintainers; [ nikstur ]; + + nodes.machine = { config, lib, pkgs, ... }: { + virtualisation.directBoot.enable = false; + virtualisation.mountHostNixStore = false; + virtualisation.useEFIBoot = true; + + # This stops the qemu-vm module from overriding the fileSystems option + # with virtualisation.fileSystems. + virtualisation.fileSystems = lib.mkForce { }; + + imports = [ externalModule ]; + }; + + testScript = { nodes, ... }: '' + import os + import subprocess + import tempfile + + tmp_disk_image = tempfile.NamedTemporaryFile() + + subprocess.run([ + "${nodes.machine.virtualisation.qemu.package}/bin/qemu-img", + "create", + "-f", + "qcow2", + "-b", + "${nodes.machine.system.build.diskImage}/nixos.qcow2", + "-F", + "qcow2", + tmp_disk_image.name, + ]) + + # Set NIX_DISK_IMAGE so that the qemu script finds the right disk image. + os.environ['NIX_DISK_IMAGE'] = tmp_disk_image.name + + machine.succeed("findmnt --kernel --source ${rootFsDevice} --target /") + ''; +} |