56 lines
1.6 KiB
Nix
56 lines
1.6 KiB
Nix
{
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options,
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config,
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lib,
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inputs,
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...
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}:
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with lib;
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with lib.frajul; let
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cfg = config.impermanence;
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in {
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imports = with inputs; [
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impermanence.nixosModules.impermanence
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persist-retro.nixosModules.persist-retro
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];
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options.impermanence = with types; {
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enable = mkBoolOpt false "Enable impermanence";
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removeTmpFilesOlderThan = mkOpt int 14 "Number of days to keep old btrfs_tmp files";
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};
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options.environment = with types; {
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persist = mkOpt attrs {} "Files and directories to persist in the home";
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};
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config = {
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# This script does the actual wipe of the system
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# So if it doesn't run, the btrfs system effectively acts like a normal system
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boot.initrd.postDeviceCommands = mkIf cfg.enable (lib.mkAfter ''
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mkdir /btrfs_tmp
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mount /dev/pool/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 $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +${builtins.toString cfg.removeTmpFilesOlderThan}); 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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environment.persistence."/persist" = mkIf cfg.enable (mkAliasDefinitions options.environment.persist);
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};
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}
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