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