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{ pkgs, lib, ... }:
{
boot.initrd.postDeviceCommands = lib.mkAfter ''
mkdir /btrfs_tmp
mount /dev/root_vg/root /btrfs_tmp
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
'';
fileSystems."/persist".neededForBoot = true;
environment.persistence."/persist/system" = {
hideMounts = true;
directories = [
"/etc/nixos"
"/var/log"
"/var/lib/bluetooth"
"/var/lib/nixos"
"/var/lib/systemd/coredump"
"/etc/NetworkManager/system-connections"
];
files = [
"/etc/machine-id"
{ file = "/var/keys/secret_file"; parentDirectory = { mode = "u=rwx,g=,o="; }; }
];
};
}
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