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refactor(machine/root): centralise root drive cfg

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This commit is contained in:
Mohammad Rafiq 2025-07-07 18:10:32 +08:00
parent fe91044c8b
commit b5772e4525
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3 changed files with 100 additions and 98 deletions
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100
nix/modules/machine/root.nix Normal file
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@ -0,0 +1,100 @@
{
config,
lib,
inputs,
...
}:
let
inherit (lib.modules) mkMerge mkIf mkAfter;
in
{
flake.modules.nixos.default =
{ hostName, ... }:
let
inherit (config.flake.manifest.hosts.nixos.${hostName}.machine) root;
in
{
imports = [ inputs.disko.nixosModules.disko ];
config = mkMerge [
{
# BTRFS - may add more later on
boot.initrd.kernelModules = [ "dm-snapshot" ];
disko.devices.disk.main = {
device = root.drive;
content.type = "gpt";
content.partitions = {
boot = {
name = "boot";
size = "1M";
type = "EF02";
};
esp = {
name = "ESP";
size = "500M";
type = "EF00";
content = {
type = "filesystem";
format = "vfat";
mountpoint = "/boot";
};
};
swap = {
size = "4G";
content = {
type = "swap";
resumeDevice = true;
};
};
root = {
name = "root";
size = "100%";
content = {
type = "lvm_pv";
vg = "root_vg";
};
};
};
};
disko.devices.lvm_vg.root_vg = {
type = "lvm_vg";
lvs.root = {
size = "100%FREE";
content = {
type = "btrfs";
extraArgs = [ "-f" ];
subvolumes = {
"/root".mountpoint = "/";
"/persist" = {
mountpoint = "/persist";
mountOptions = [
"subvol=persist"
"noatime"
];
};
"/nix" = {
mountpoint = "/nix";
mountOptions = [
"subvol=nix"
"noatime"
];
};
};
};
};
};
}
# Ephemeral by default - assumes btrfs
(mkIf (config.flake.manifest.hosts.nixos.${hostName}.machine.root.ephemeral or true) {
boot.initrd.postDeviceCommands = mkAfter ''
mkdir /btrfs_tmp
mount /dev/root_vg/root /btrfs_tmp
if [[ -e /btrfs_tmp/root ]]; then
btrfs subvolume delete "/btrfs_tmp/root"
fi
'';
})
];
};
}

75
nix/modules/machine/root/drive.nix
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@ -1,75 +0,0 @@
{ config, inputs, ... }:
{
flake.modules.nixos.default =
{ hostName, ... }:
{
imports = [ inputs.disko.nixosModules.disko ];
boot.initrd.kernelModules = [ "dm-snapshot" ];
# BTRFS - may add more later on
disko.devices.disk.main = {
device = config.flake.manifest.hosts.nixos.${hostName}.machine.root.drive;
type = "disk";
content.type = "gpt";
content.partitions = {
boot = {
name = "boot";
size = "1M";
type = "EF02";
};
esp = {
name = "ESP";
size = "500M";
type = "EF00";
content = {
type = "filesystem";
format = "vfat";
mountpoint = "/boot";
};
};
swap = {
size = "4G";
content = {
type = "swap";
resumeDevice = true;
};
};
root = {
name = "root";
size = "100%";
content = {
type = "lvm_pv";
vg = "root_vg";
};
};
};
};
disko.devices.lvm_vg.root_vg = {
type = "lvm_vg";
lvs.root = {
size = "100%FREE";
content = {
type = "btrfs";
extraArgs = [ "-f" ];
subvolumes = {
"/root".mountpoint = "/";
"/persist" = {
mountpoint = "/persist";
mountOptions = [
"subvol=persist"
"noatime"
];
};
"/nix" = {
mountpoint = "/nix";
mountOptions = [
"subvol=nix"
"noatime"
];
};
};
};
};
};
};
}

23
nix/modules/machine/root/ephemeral.nix
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@ -1,23 +0,0 @@
{ config, lib, ... }:
let
inherit (lib.modules) mkMerge mkIf mkAfter;
in
{
flake.modules.nixos.default =
{ hostName, ... }:
{
config = mkMerge [
# Ephemeral by default - assumes btrfs
(mkIf (config.flake.manifest.hosts.nixos.${hostName}.machine.root.ephemeral or true) {
boot.initrd.postDeviceCommands = mkAfter ''
mkdir /btrfs_tmp
mount /dev/root_vg/root /btrfs_tmp
if [[ -e /btrfs_tmp/root ]]; then
btrfs subvolume delete "/btrfs_tmp/root"
fi
'';
})
];
};
}