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116 lines
3.2 KiB
Nix
116 lines
3.2 KiB
Nix
{
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config,
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lib,
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options,
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...
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}:
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let
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self = options.x-banananetwork.vmDisko;
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cfg = config.x-banananetwork.vmDisko;
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in
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{
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# TODO upstream that to disko
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options.x-banananetwork.vmDisko = {
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enable = lib.mkEnableOption ''
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VM disk configuration with disko.
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Will be automatically enabled when option{x-banananetwork.vmDisko.generation} is manually set.
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'';
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mainDiskName = lib.mkOption {
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description = ''
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Name of the main disk.
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Similar to {option}`system.stateVersion`,
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**do not change this** unless you know what you are doing.
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'';
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type = lib.types.str;
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};
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generation = lib.mkOption {
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description = ''
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Disk generation to use.
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Similar to {option}`system.stateVersion`,
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**do not change this** unless you know what you are doing.
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See option {option}`x-banananetwork.vmDisko.generations`
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for a list of all generations available.
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'';
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type = with lib.types; nullOr str;
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default = null;
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example = self.recommendedGeneration.default;
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};
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recommendedGeneration = lib.mkOption {
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description = ''
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Disk generation recommended to use for new systems.
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'';
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default = "ext4-1";
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readOnly = true;
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};
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generationsDir = lib.mkOption {
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description = ''
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Directories where to search for generations.
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A generation must at least use one disk with the attr name `main`
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(through its label name can be different)
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because VMs are expected to have at least one disk as their primary available.
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'';
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type = lib.types.path;
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default = ./.;
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example = ./.;
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};
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generationPath = lib.mkOption {
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description = "Path to selected generation template.";
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readOnly = true;
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type = lib.types.path;
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default =
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let
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path = cfg.generationsDir + "/${cfg.generation}";
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in
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if builtins.pathExists path then path else path + ".nix";
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defaultText = lib.literalExpression ''
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with config.x-banananetwork.vmDisko;
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generationsDir + ("/''${generation}" or "/''${generation}.nix")
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'';
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};
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};
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config = lib.mkMerge [
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(lib.mkIf (cfg.generation != null) { x-banananetwork.vmDisko.enable = true; })
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(lib.mkIf cfg.enable {
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assertions = [
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{
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assertion = cfg.enable -> cfg.generation != null;
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message = "x-banananetwork.vmDisko.generation must be set. Currently \"${cfg.recommendedGeneration}\" is recommended.";
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}
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{
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assertion = cfg.generation != null -> builtins.pathExists cfg.generationPath;
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message = "generation \"${cfg.generation}\" was not found in ${cfg.generationPath}";
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}
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];
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disko.devices = lib.mkMerge [
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(import cfg.generationPath)
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{
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# avoid mixing VM disks
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# hint: mkOverride required because
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# - cfg.generations from above is already type-checked, hence priorities are discharged
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# - assigment from above has default priority of 100
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#disk.main.name = lib.mkOverride 99 cfg.mainDiskName;
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disk.main.name = cfg.mainDiskName;
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}
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];
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})
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];
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}
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