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{ config, lib, utils, pkgs, ... }:
with utils;
with lib;
let
cfg = config.services.borgbackup;
lvmPath = {
options = {
LV = mkOption {
type = types.str;
};
VG = mkOption {
type = types.str;
};
};
};
pathType = if cfg.snapshots == "lvm" then types.submodule lvmPath else types.path;
systemdPath = path: escapeSystemdPath (if cfg.snapshots == "lvm" then "${path.VG}-${path.LV}" else path);
withSuffix = path: path + (if cfg.snapshots == "btrfs" then config.services.btrfs-snapshots.mountSuffix else config.services.lvm-snapshots.mountSuffix);
mountPoint = if cfg.snapshots == "lvm" then config.services.lvm-snapshots.mountPoint else "";
targetOptions = {
options = {
repo = mkOption {
type = types.str;
};
paths = mkOption {
type = types.listOf pathType;
default = [];
};
prune = mkOption {
type = types.attrsOf (types.listOf types.str);
default = {};
};
interval = mkOption {
type = types.str;
default = "6h";
};
jitter = mkOption {
type = with types; nullOr str;
default = "6h";
};
lock = mkOption {
type = types.nullOr types.str;
default = "backup";
};
network = mkOption {
type = types.bool;
default = true;
};
lockWait = mkOption {
type = types.int;
default = 600;
};
};
};
in {
options = {
services.borgbackup = {
snapshots = mkOption {
type = types.nullOr (types.enum ["btrfs" "lvm"]);
default = null;
};
targets = mkOption {
type = types.attrsOf (types.submodule targetOptions);
default = {};
};
prefix = mkOption {
type = types.str;
};
};
};
imports =
[ ./lvm-snapshots.nix
./btrfs-snapshots.nix
];
config = mkIf (any (t: t.paths != []) (attrValues cfg.targets)) {
services.btrfs-snapshots.enable = mkIf (cfg.snapshots == "btrfs") true;
services.lvm-snapshots.snapshots = mkIf (cfg.snapshots == "lvm") (listToAttrs (map (path: nameValuePair (path.VG + "-" + path.LV) {
inherit (path) LV VG;
mountName = withSuffix (path.VG + "-" + path.LV);
}) (unique (flatten (mapAttrsToList (target: tCfg: tCfg.paths) cfg.targets)))));
systemd.targets."timers-borg" = {
wantedBy = [ "timers.target" ];
};
systemd.slices."system-borgbackup" = {};
systemd.timers = (listToAttrs (map ({ target, path, tCfg }: nameValuePair "borgbackup-${target}@${systemdPath path}" {
requiredBy = [ "timers-borg.target" ];
timerConfig = {
Persistent = false;
OnBootSec = tCfg.interval;
OnUnitActiveSec = tCfg.interval;
RandomizedDelaySec = mkIf (tCfg.jitter != null) tCfg.jitter;
};
}) (flatten (mapAttrsToList (target: tCfg: map (path: { inherit target path tCfg; }) tCfg.paths) cfg.targets)))) // (mapAttrs' (target: tCfg: nameValuePair "borgbackup-prune-${target}" {
enable = tCfg.prune != {};
requiredBy = [ "timers-borg.target" ];
timerConfig = {
Persistent = false;
OnBootSec = tCfg.interval;
OnUnitActiveSec = tCfg.interval;
RandomizedDelaySec = mkIf (tCfg.jitter != null) tCfg.jitter;
};
}) cfg.targets);
systemd.services = (mapAttrs' (target: tCfg: nameValuePair "borgbackup-${target}@" (let
deps = flatten [
(optional (cfg.snapshots == "btrfs") "btrfs-snapshot@%i.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 ${toString tCfg.lockWait} \
--stats \
--list \
--filter 'AME' \
--exclude-caches \
--keep-exclude-tags \
--patterns-from .backup-${target} \
--one-file-system \
--compression auto,lzma \
${tCfg.repo}::${cfg.prefix}$1-{utcnow}
'';
in if tCfg.lock == null then borgCmd else "flock -xo /var/lock/${tCfg.lock} ${borgCmd}";
scriptArgs = if cfg.snapshots == "lvm" then "%I" else "%i";
unitConfig = {
AssertPathIsDirectory = mkIf (tCfg.lock != null) "/var/lock";
DefaultDependencies = false;
RequiresMountsFor = mkIf (cfg.snapshots == "lvm") [ "${mountPoint}/${withSuffix "%I"}" ];
};
serviceConfig = {
Type = "oneshot";
WorkingDirectory = if (cfg.snapshots == null) then "%I" else (if (cfg.snapshots == "lvm") then "${mountPoint}/${withSuffix "%I"}" else "${withSuffix "%f"}");
Nice = 15;
IOSchedulingClass = 2;
IOSchedulingPriority = 7;
SuccessExitStatus = [1 2];
Slice = "system-borgbackup.slice";
};
})) cfg.targets) // (mapAttrs' (target: tCfg: nameValuePair "borgbackup-prune-${target}" {
enable = tCfg.prune != {};
bindsTo = ["network-online.target"];
after = ["network-online.target"];
path = with pkgs; [borgbackup];
script = concatStringsSep "\n" (mapAttrsToList (path: args: ''
borg prune \
--lock-wait ${toString tCfg.lockWait} \
--list \
--stats \
--prefix ${escapeShellArg "${cfg.prefix}${path}"} \
${escapeShellArgs args} \
${tCfg.repo}
'') tCfg.prune);
serviceConfig = {
Type = "oneshot";
Slice = "system-borgbackup.slice";
};
}) cfg.targets);
};
}
|
