41 lines
1 KiB
Nix
41 lines
1 KiB
Nix
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{ pkgs, ... }:
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{
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boot = {
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kernelPackages = pkgs.linuxPackages_latest;
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kernel.sysctl."vm.max_map_count" = 2147483642;
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initrd = {
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systemd = {
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enable = true;
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services.root-reset = {
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description = "Reset BTRFS root and snapshot last boot";
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wantedBy = [ "initrd.target" ];
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after = [ "dev-nixos-root.device" ];
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before = [ "sysroot.mount" ];
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unitConfig.DefaultDependencies = "no";
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serviceConfig.Type = "oneshot";
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script = ''
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mkdir -p /mnt
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mount /dev/nixos/root /mnt
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if [[ -e /mnt/@prev ]]; then
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btrfs subvolume delete /mnt/@prev
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fi
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btrfs subvolume snapshot /mnt/@ /mnt/@prev
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btrfs subvolume list -o /mnt/@ | cut -f9 -d' ' | while read subvolume; do
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btrfs subvolume delete "/mnt/$subvolume"
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done
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btrfs subvolume delete /mnt/@
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btrfs subvolume create /mnt/@
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umount /mnt
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'';
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};
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};
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};
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};
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}
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