51 lines
1.2 KiB
Nix
51 lines
1.2 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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inherit (lib) mkEnableOption mkOption types mkIf;
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cfg = config."nixos-in-place";
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in
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{
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imports = [ ];
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options."nixos-in-place" = {
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enable = mkEnableOption "enable nixos-in-place FS";
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rootfs = mkOption {
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type = types.str;
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description = "device name for root fs";
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};
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swapfs = mkOption {
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type = types.str;
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description = "device name for root fs";
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};
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};
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config = mkIf cfg.enable {
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boot = {
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kernelModules = [ ];
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extraModulePackages = [ ];
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kernelParams = ["root=${cfg.rootfs}" "boot.shell_on_fail"];
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loader.grub = {
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enable = true;
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storePath = "/nixos/nix/store";
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};
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initrd = {
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supportedFilesystems = [ "ext4" ];
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postDeviceCommands = ''
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mkdir -p /mnt-root/old-root ;
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mount -t ext4 ${cfg.rootfs} /mnt-root/old-root ;
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'';
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};
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};
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fileSystems = {
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"/" = {
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device = "/old-root/nixos";
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fsType = "none";
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options = [ "bind" ];
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};
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"/old-root" = {
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device = cfg.rootfs;
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fsType = "ext4";
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};
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};
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swapDevices = [ { device = cfg.swapfs; } ];
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};
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}
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