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make-disk-image: add useVirtualDevices option #1008

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make-disk-image: add useVirtualDevices option #1008

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35 changes: 21 additions & 14 deletions lib/make-disk-image.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -55,34 +55,40 @@ let
customQemu = cfg.qemu;
}
);

cleanedConfig = diskoLib.testLib.prepareDiskoConfig config diskoLib.testLib.devices;
systemToInstall = extendModules {
virtualDevicesModule = {
disko.devices = lib.mkForce cleanedConfig.disko.devices;
boot.loader.grub.devices = lib.mkForce cleanedConfig.boot.loader.grub.devices;
};
system = extendModules {
modules = [
cfg.extraConfig
{
disko.testMode = true;
disko.devices = lib.mkForce cleanedConfig.disko.devices;
boot.loader.grub.devices = lib.mkForce cleanedConfig.boot.loader.grub.devices;
}
];
};
systemToInstallNative =
cleanedSystem = system.extendModules {
modules = [ virtualDevicesModule ];
};
systemNative =
if binfmt.systemsAreDifferent then
extendModules {
system.extendModules {
modules = [
cfg.extraConfig
{
disko.testMode = true;
disko.devices = lib.mkForce cleanedConfig.disko.devices;
boot.loader.grub.devices = lib.mkForce cleanedConfig.boot.loader.grub.devices;
boot.kernelPackages = lib.mkDefault cfg.kernelPackages;
nixpkgs.hostPlatform = lib.mkForce pkgs.stdenv.hostPlatform;
nixpkgs.buildPlatform = lib.mkForce pkgs.stdenv.hostPlatform;
}
];
}
else
systemToInstall;
system;
cleanedSystemNative = systemNative.extendModules {
modules = [ virtualDevicesModule ];
};
dependencies =
with pkgs;
[
Expand Down Expand Up @@ -111,9 +117,6 @@ let
install -m600 ${pkgs.OVMF.variables} efivars.fd
'';

closureInfo = pkgs.closureInfo {
rootPaths = [ systemToInstall.config.system.build.toplevel ];
};
partitioner = ''
set -efux
# running udev, stolen from stage-1.sh
Expand All @@ -124,7 +127,7 @@ let
ln -sfn /proc/self/fd/2 /dev/stderr
mkdir -p /etc/udev
mount -t efivarfs none /sys/firmware/efi/efivars
ln -sfn ${systemToInstallNative.config.environment.etc."udev/rules.d".source} /etc/udev/rules.d
ln -sfn ${cleanedSystemNative.config.environment.etc."udev/rules.d".source} /etc/udev/rules.d
mkdir -p /dev/.mdadm
${pkgs.systemdMinimal}/lib/systemd/systemd-udevd --daemon
partprobe
Expand All @@ -134,9 +137,13 @@ let
${lib.optionalString diskoCfg.testMode ''
export IN_DISKO_TEST=1
''}
${lib.getExe systemToInstallNative.config.system.build.destroyFormatMount} --yes-wipe-all-disks
${lib.getExe cleanedSystemNative.config.system.build.destroyFormatMount} --yes-wipe-all-disks
'';

systemToInstall = if cfg.useVirtualDevices then cleanedSystem else system;
closureInfo = pkgs.closureInfo {
rootPaths = [ systemToInstall.config.system.build.toplevel ];
};
installer = lib.optionalString cfg.copyNixStore ''
${binfmtSetup}
unset NIX_REMOTE
Expand Down
9 changes: 9 additions & 0 deletions module.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,15 @@ in
description = "QEMU image format to use for the disk images";
default = "raw";
};

useVirtualDevices = lib.mkOption {
type = lib.types.bool;
description = ''
Replace device names with ones usable in VMs. Ex: `/dev/vda`.
Disable this if the disk image is for use on real hardware.
'';
default = true;
};
};

memSize = lib.mkOption {
Expand Down
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