64 lines
1.6 KiB
Nix
64 lines
1.6 KiB
Nix
{ config, lib, pkgs, modulesPath, hostname, ... }:
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let
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rootDisk = "/dev/disk/by-partlabel/disk-${hostname}-root";
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bootDisk = "/dev/disk/by-partlabel/disk-${hostname}-ESP";
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in
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{
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boot.initrd.postDeviceCommands = lib.mkAfter ''
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mkdir /btrfs_tmp
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mount ${rootDisk} /btrfs_tmp
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if [[ -e /btrfs_tmp/root ]]; then
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mkdir -p /btrfs_tmp/old_roots
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timestamp=$(date +%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 $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +7); do
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delete_subvolume_recursively "$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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fileSystems."/" = {
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device = rootDisk;
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fsType = "btrfs";
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options = [ "subvol=root" ];
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};
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fileSystems."/persist" = {
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device = rootDisk;
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neededForBoot = true;
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fsType = "btrfs";
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options = [ "subvol=persist" ];
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};
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fileSystems."/nix" = {
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device = rootDisk;
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neededForBoot = true;
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fsType = "btrfs";
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options = [ "subvol=nix" ];
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};
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fileSystems."/boot" = {
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device = bootDisk;
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fsType = "vfat";
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options = [ "fmask=0022" "dmask=0022" "umask=0077" ];
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};
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swapDevices = [ {
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device = "/.swapvol/swapfile";
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} ];
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}
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