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