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# sudo mount --ro /dev/nvme0n1p2 ./mnt --mkdir
# ls mnt/old_roots
{ lib, config, options, ... }:
let
cfg = config.oden.persist;
in
{
options.oden.persist =
with lib;
with types;
{
directories = mkOption {
type = listOf (types.oneOf [ str (types.attrsOf types.anything) ]);
default = [ ];
description = "Directories that should be persisted";
};
};
config = {
boot.initrd.postResumeCommands = lib.mkAfter ''
mkdir /btrfs_tmp
mount /dev/disk/by-partlabel/disk-main-root /btrfs_tmp # CONFIRM THIS IS CORRECT FROM findmnt
if [[ -e /btrfs_tmp/root ]]; then
mkdir -p /btrfs_tmp/old_roots
timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
fi
delete_subvolume_recursively() {
IFS=$'\n'
for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
delete_subvolume_recursively "/btrfs_tmp/$i"
done
btrfs subvolume delete "$1"
}
for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
delete_subvolume_recursively "$i"
done
btrfs subvolume create /btrfs_tmp/root
umount /btrfs_tmp
'';
environment.persistence."/nix/persist" = {
hideMounts = true;
directories = cfg.directories ++ [
"/var/log"
"/var/lib/nixos"
"/var/lib/systemd"
];
files = [
"/etc/machine-id"
"/etc/ssh/ssh_host_ed25519_key"
"/etc/ssh/ssh_host_ed25519_key.pub"
];
};
};
}
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