46 lines
1 KiB
Nix
46 lines
1 KiB
Nix
{ config, lib, ... }:
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{
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config = lib.mkIf (
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(config.fileSystems ? "/persist")
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&& (config.fileSystems."/persist".fsType or "" == "btrfs")
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) {
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boot.initrd.supportedFilesystems = [ "btrfs" ];
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boot.initrd.postDeviceCommands = lib.mkAfter ''
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mkdir -p /mnt
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mount -t btrfs -o subvol=/ /dev/disk/by-label/nixos /mnt
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if [ ! -d /mnt/root-blank ]; then
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btrfs subvolume snapshot -r /mnt/root /mnt/root-blank
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fi
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if [ -d /mnt/root ]; then
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btrfs subvolume delete /mnt/root
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fi
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btrfs subvolume snapshot /mnt/root-blank /mnt/root
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umount /mnt
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'';
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fileSystems."/persist".neededForBoot = true;
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environment.persistence."/persist" = {
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hideMounts = true;
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directories = [
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"/etc/nixos"
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"/etc/ssh"
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"/etc/cups"
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"/var/lib/cups"
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"/var/lib/libvirt"
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"/var/lib/secureboot"
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"/var/lib/tailscale"
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"/var/lib/systemd"
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"/var/lib/nixos"
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];
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files = [
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"/etc/machine-id"
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];
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};
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};
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}
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