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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.btrfs-snapshots;
snapshotMount = str: "${str}${cfg.mountSuffix}";
in {
options = {
services.btrfs-snapshots = {
enable = mkEnableOption "a systemd unit for btrfs snapshots";
mountSuffix = mkOption {
type = types.str;
default = ".snapshot";
};
readOnly = mkOption {
type = types.bool;
default = true;
};
persist = mkOption {
type = types.bool;
default = false;
};
};
};
config = mkIf cfg.enable {
systemd.services."btrfs-snapshot@" = {
enable = true;
unitConfig = {
StopWhenUnneeded = !cfg.persist;
};
serviceConfig = with pkgs; {
Type = "oneshot";
ExecStartPre = "-${btrfs-progs}/bin/btrfs subvolume delete -c ${snapshotMount "%f"}";
ExecStart = "${btrfs-progs}/bin/btrfs subvolume snapshot ${optionalString cfg.readOnly "-r"} %f ${snapshotMount "%f"}";
RemainAfterExit = true;
ExecStop = "${btrfs-progs}/bin/btrfs subvolume delete -c ${snapshotMount "%f"}";
};
};
};
}
|
