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nixos/qemu-vm: add option for a separate boot partition on BIOS

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This patch adds the option `virtualisation.useBootPartition` which
creates a separate boot partition on BIOS systems using the new
`legacy+boot` partition layout type in `nixos/lib/make-disk-image.nix`.
This commit is contained in:
sanana 2025-03-19 22:42:42 +03:00 • committed by Masum Reza
parent 11ed9936cc
commit 95355b4d94
1 changed files with 36 additions and 5 deletions
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41
nixos/modules/virtualisation/qemu-vm.nix
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@ -62,8 +62,20 @@ let
}; };
selectPartitionTableLayout = selectPartitionTableLayout =
{ useEFIBoot, useDefaultFilesystems }: {
if useDefaultFilesystems then if useEFIBoot then "efi" else "legacy" else "none"; useEFIBoot,
useDefaultFilesystems,
useBootPartition,
}:
if useDefaultFilesystems then
if useEFIBoot then
"efi"
else if useBootPartition then
"legacy+boot"
else
"legacy"
else
"none";
driveCmdline = driveCmdline =
idx: idx:
@ -337,7 +349,9 @@ let
format = "qcow2"; format = "qcow2";
onlyNixStore = false; onlyNixStore = false;
label = rootFilesystemLabel; label = rootFilesystemLabel;
partitionTableType = selectPartitionTableLayout { inherit (cfg) useDefaultFilesystems useEFIBoot; }; partitionTableType = selectPartitionTableLayout {
inherit (cfg) useBootPartition useDefaultFilesystems useEFIBoot;
};
installBootLoader = cfg.installBootLoader; installBootLoader = cfg.installBootLoader;
touchEFIVars = cfg.useEFIBoot; touchEFIVars = cfg.useEFIBoot;
diskSize = "auto"; diskSize = "auto";
@ -431,8 +445,17 @@ in
virtualisation.bootPartition = mkOption { virtualisation.bootPartition = mkOption {
type = types.nullOr types.path; type = types.nullOr types.path;
default = if cfg.useEFIBoot then "/dev/disk/by-label/${espFilesystemLabel}" else null; default =
defaultText = literalExpression ''if cfg.useEFIBoot then "/dev/disk/by-label/${espFilesystemLabel}" else null''; if cfg.useEFIBoot then
"/dev/disk/by-label/${espFilesystemLabel}"
else if cfg.useBootPartition then
"/dev/disk/by-label/BOOT"
else
null;
defaultText = literalExpression ''
if cfg.useEFIBoot then "/dev/disk/by-label/${espFilesystemLabel}"
else if cfg.useBootPartition then "/dev/disk/by-label/BOOT"
else null'';
example = "/dev/disk/by-label/esp"; example = "/dev/disk/by-label/esp";
description = '' description = ''
The path (inside the VM) to the device containing the EFI System Partition (ESP). The path (inside the VM) to the device containing the EFI System Partition (ESP).
@ -929,6 +952,14 @@ in
''; '';
}; };
virtualisation.useBootPartition = mkEnableOption null // {
description = ''
If enabled for legacy MBR VMs, the VM image will have a separate boot
partition mounted at /boot.
useBootPartition is ignored if useEFIBoot == true.
'';
};
virtualisation.useEFIBoot = mkOption { virtualisation.useEFIBoot = mkOption {
type = types.bool; type = types.bool;
default = false; default = false;