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{ utils, ... }: {
# Use /persist as the persistence root, matching Disko's mountpoint
environment.persistence."/persist" = {
hideMounts = true;
directories = [
"/var/lib/nixos"
"/var/lib/systemd/coredump"
"/var/lib/systemd/timers"
"/var/lib/backups"
"/var/lib/headscale"
"/var/lib/caddy" # for certs
{
directory = "/var/lib/secrets";
user = "root";
group = "root";
mode = "u=rwx,g=,o=";
}
];
files = [
"/etc/machine-id"
"/etc/shadow"
"/etc/passwd"
];
};
boot.initrd.systemd.services.wipe-root = {
# Specify dependencies explicitly
unitConfig.DefaultDependencies = false;
serviceConfig.Type = "oneshot";
wantedBy = [ "initrd.target" ];
before = [ "sysroot.mount" ]; # before any fs are mounted
# Wait for the disk to appear
requires = [
"${utils.escapeSystemPath "/dev/disk/by-label/root"}.device"
];
after = [
"${utils.escapeSystemPath "/dev/disk/by-label/root"}.device"
# Allow hibernation to resume before trying to alter any data
"local-fs-pre.target"
];
script = ''
mkdir /btrfs_tmp
mount /dev/disk/by-label/root /btrfs_tmp
trap 'umount /btrfs_tmp' EXIT
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
find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30 -print0 |
xargs --null -I '{}' btrfs subvolume delete --recursive '{}'
btrfs subvolume create /btrfs_tmp/root
'';
};
}
|
