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45 lines
1.3 KiB
Nix
45 lines
1.3 KiB
Nix
{ pkgs, lib, config, ... }:
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with lib; {
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options.mods.impermanence.enable = mkEnableOption "enables impermanence";
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config = mkIf config.mods.impermanence.enable {
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environment.persistence."/persist" = {
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directories =
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[ "/var/lib/nixos" "/var/lib/systemd/coredump" "/etc/nixos" ];
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files = [
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"/etc/machine-id"
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"/etc/passwd"
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"/etc/group"
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"/etc/shadow"
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"/etc/subgid"
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"/etc/subuid"
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"/etc/sudoers"
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];
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};
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boot.initrd.postResumeCommands = lib.mkAfter ''
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mkdir /btrfs_tmp
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mount /dev/mapper/crypted /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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};
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}
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