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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.borgbackup;
targetOptions = {
options = {
repo = mkOption {
type = types.str;
};
paths = mkOption {
type = types.listOf types.str;
default = [];
};
prune = mkOption {
type = types.attrsOf (types.listOf types.str);
default = {};
};
interval = mkOption {
type = types.str;
default = "6h";
};
lock = mkOption {
type = types.nullOr types.str;
default = "backup";
};
network = mkOption {
type = types.bool;
default = true;
};
};
};
in {
options = {
services.borgbackup = {
snapshots = mkOption {
type = types.nullOr (types.enum ["btrfs"]);
default = null;
};
targets = mkOption {
type = types.attrsOf (types.submodule targetOptions);
default = {};
};
prefix = mkOption {
type = types.str;
};
};
};
config = mkIf (any (t: t.paths != []) (attrValues cfg.targets)) {
services.btrfs-snapshots.enable = mkIf (cfg.snapshots == "btrfs") true;
systemd.timers = listToAttrs (map ({ target, path, tCfg }: nameValuePair "borgbackup-${target}-${path}" {
wantedBy = [ "timers.target" ];
timerConfig = {
Persistent = false;
OnBootSec = tCfg.interval;
OnUnitInactiveSec = tCfg.interval;
};
}) (flatten (mapAttrsToList (target: tCfg: map (path: { inherit target path tCfg; }) tCfg.paths) cfg.targets)));
systemd.services = listToAttrs (map ({ target, path, tCfg }: nameValuePair "borgbackup-${target}@${path}" (let
deps = flatten [
(optional (cfg.snapshots == "btrfs") "btrfs-snapshot@%p.service")
(optional tCfg.network "network-online.target")
];
in {
bindsTo = deps;
after = deps;
path = with pkgs; [borgbackup] ++ optional (tCfg.lock != null) utillinux;
script = let
borgCmd = ''
borg create \
--lock-wait 600 \
--stats \
--list \
--filter 'AME' \
--exclude-caches \
--keep-exclude-tags \
--patterns-from .backup \
--one-file-system \
--compression auto,lzma \
${tCfg.repo}::${cfg.prefix}${path}-{utcnow}
'';
in if tCfg.lock == null then borgCmd else "flock -xo /var/lock/${tCfg.lock} ${borgCmd}";
preStop = mkIf (hasAttr path tCfg.prune) ''
borg prune \
--prefix "${tcfg.prefix}${path}" \
${concatStringsSep " " tCfg.prune."${path}"} \
${tCfg.repo}
'';
unitConfig = {
AssertPathIsDirectory = mkIf (tCfg.lock != null) "/var/lock";
};
serviceConfig = {
Type = "oneshot";
WorkingDirectory = if (cfg.snapshots == null) then "%p" else "/mnt/snapshot-%i";
Nice = 15;
IOSchedulingClass = 2;
IOSchedulingPriority = 7;
SuccessExitStatus = [1 2];
};
})) (flatten (mapAttrsToList (target: tCfg: map (path: { inherit target path tCfg; }) tCfg.paths) cfg.targets)));
};
}
|
