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refactor(nixos): move btrfs config to its own module

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This commit is contained in:
Mohammad Rafiq 2025-06-16 18:31:56 +08:00
parent 9f6b094daa
commit b7e9cdf51d
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3 changed files with 108 additions and 110 deletions
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101
modules/nixos/hardware/btrfs.nix
View file

@ -1,101 +0,0 @@
{ lib, config, ... }:
let
cfg = config.hardware.drives.btrfs;
in
{
config = lib.mkIf cfg.enable (
lib.mkMerge [
{
boot.initrd.kernelModules = [ "dm-snapshot" ];
disko.devices.disk.main = {
device = cfg.drive;
type = "disk";
content.type = "gpt";
content.partitions = {
boot.name = "boot";
boot.size = "1M";
boot.type = "EF02";
esp.name = "ESP";
esp.size = "500M";
esp.type = "EF00";
esp.content = {
type = "filesystem";
format = "vfat";
mountpoint = "/boot";
};
swap.size = "4G";
swap.content = {
type = "swap";
resumeDevice = true;
};
root.name = "root";
root.size = "100%";
root.content = {
type = "lvm_pv";
vg = "root_vg";
};
};
};
disko.devices.lvm_vg.root_vg = {
type = "lvm_vg";
lvs.root.size = "100%FREE";
lvs.root.content.type = "btrfs";
lvs.root.content.extraArgs = [ "-f" ];
lvs.root.content.subvolumes = {
"/root".mountpoint = "/";
"/persist".mountpoint = "/persist";
"/persist".mountOptions = [
"subvol=persist"
"noatime"
];
"/nix".mountpoint = "/nix";
"/nix".mountOptions = [
"subvol=nix"
"noatime"
];
};
};
}
(lib.mkIf cfg.ephemeralRoot {
boot.initrd.postDeviceCommands = lib.mkAfter ''
mkdir /btrfs_tmp
mount /dev/root_vg/root /btrfs_tmp
if [[ -e /btrfs_tmp/root ]]; then
mkdir -p /btrfs_tmp/old_roots
timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
fi
delete_subvolume_recursively() {
IFS=$'\n'
for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
delete_subvolume_recursively "/btrfs_tmp/$i"
done
btrfs subvolume delete "$1"
}
for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
delete_subvolume_recursively "$i"
done
btrfs subvolume create /btrfs_tmp/root
umount /btrfs_tmp
'';
programs.fuse.userAllowOther = true;
fileSystems."/persist".neededForBoot = true;
#FIXME: below should be in module or something
environment.persistence."/persist" = {
hideMounts = true;
files = [
"/etc/ssh/ssh_host_ed25519_key"
"/etc/ssh/ssh_host_ed25519_key.pub"
"/etc/ssh/ssh_host_rsa_key"
"/etc/ssh/ssh_host_rsa_key.pub"
"/etc/machine-id"
];
};
})
]
);
}

10
modules/nixos/hardware/default.nix
View file

@ -1,27 +1,19 @@
{
lib,
config,
pkgs,
...
}:
let
inherit (lib) mkIf mkEnableOption singleton;
cfg = config.hardware;
inherit (lib) singleton;
in
{
imports = [
./btrfs.nix
./nvidia.nix
./audio.nix
./networking.nix
];
options.hardware = {
drives.btrfs = {
enable = lib.mkEnableOption "";
drive = lib.pantheon.mkStrOption;
ephemeralRoot = lib.mkEnableOption "";
};
gpu = lib.pantheon.mkStrOption;
platform = lib.pantheon.mkStrOption;
};

107
modules/nixos/hardware/drives/btrfs/default.nix Normal file
View file

@ -0,0 +1,107 @@
{ config, lib, ... }:
let
inherit (lib) mkIf mkEnableOption;
inherit (lib.pantheon) mkStrOption;
cfg = config.hardware.drives.btrfs;
ephemeralRootCfg = {
boot.initrd.postDeviceCommands = lib.mkAfter ''
mkdir /btrfs_tmp
mount /dev/root_vg/root /btrfs_tmp
if [[ -e /btrfs_tmp/root ]]; then
mkdir -p /btrfs_tmp/old_roots
timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
fi
delete_subvolume_recursively() {
IFS=$'\n'
for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
delete_subvolume_recursively "/btrfs_tmp/$i"
done
btrfs subvolume delete "$1"
}
for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
delete_subvolume_recursively "$i"
done
btrfs subvolume create /btrfs_tmp/root
umount /btrfs_tmp
'';
programs.fuse.userAllowOther = true;
fileSystems."/persist".neededForBoot = true;
#FIXME: below should be in module or something
environment.persistence."/persist" = {
hideMounts = true;
files = [
"/etc/ssh/ssh_host_ed25519_key"
"/etc/ssh/ssh_host_ed25519_key.pub"
"/etc/ssh/ssh_host_rsa_key"
"/etc/ssh/ssh_host_rsa_key.pub"
"/etc/machine-id"
];
};
};
in
{
options.hardware.drives.btrfs = {
enable = mkEnableOption "";
drive = mkStrOption;
ephemeralRoot = mkEnableOption "";
};
config = mkIf cfg.enable (
{
boot.initrd.kernelModules = [ "dm-snapshot" ];
disko.devices.disk.main = {
device = cfg.drive;
type = "disk";
content.type = "gpt";
content.partitions = {
boot.name = "boot";
boot.size = "1M";
boot.type = "EF02";
esp.name = "ESP";
esp.size = "500M";
esp.type = "EF00";
esp.content = {
type = "filesystem";
format = "vfat";
mountpoint = "/boot";
};
swap.size = "4G";
swap.content = {
type = "swap";
resumeDevice = true;
};
root.name = "root";
root.size = "100%";
root.content = {
type = "lvm_pv";
vg = "root_vg";
};
};
};
disko.devices.lvm_vg.root_vg = {
type = "lvm_vg";
lvs.root.size = "100%FREE";
lvs.root.content.type = "btrfs";
lvs.root.content.extraArgs = [ "-f" ];
lvs.root.content.subvolumes = {
"/root".mountpoint = "/";
"/persist".mountpoint = "/persist";
"/persist".mountOptions = [
"subvol=persist"
"noatime"
];
"/nix".mountpoint = "/nix";
"/nix".mountOptions = [
"subvol=nix"
"noatime"
];
};
};
}
// ephemeralRootCfg
);
}