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|
{ lib, config, pkgs, ... }:
with lib; let
cfg = config.local;
in
{
options.local = with lib.types; {
snapperSubvols = mkOption {
type = attrsOf str;
default = { };
};
fs.btrfs = mkOption {
default = [ ];
type = attrsOf (submodule {
options = {
device = mkOption {
type = str;
};
subvol = mkOption {
type = str;
};
ssd = mkOption {
type = bool;
};
snapper = mkOption {
type = nullOr str;
default = null;
};
};
});
};
};
config = {
environment.systemPackages = optional (cfg.snapperSubvols != { }) pkgs.local.btclone;
fileSystems =
let
inherit (cfg) fs;
btrfs = { device, subvol, ssd, ... }: {
inherit device;
fsType = "btrfs";
options = [ "noatime" "compress=zstd" "subvol=${subvol}" ] ++ optional ssd "ssd";
};
in
mapAttrs (_: btrfs) cfg.fs.btrfs;
local.snapperSubvols =
let
snapperEntry = path: opts: { name = opts.snapper; value = path; };
validEntry = _: opts: opts.snapper != null;
in
mapAttrs' snapperEntry (filterAttrs validEntry cfg.fs.btrfs);
services.snapper.configs =
let
snapperConfig = _: subvolume: {
inherit subvolume;
extraConfig = ''
# btrfs qgroup for space aware cleanup algorithms
QGROUP=""
# fraction of the filesystems space the snapshots may use
SPACE_LIMIT="0.5"
# fraction of the filesystems space that should be free
FREE_LIMIT="0.2"
# users and groups allowed to work with config
ALLOW_USERS=""
ALLOW_GROUPS=""
# sync users and groups from ALLOW_USERS and ALLOW_GROUPS to .snapshots
# directory
SYNC_ACL="no"
# start comparing pre- and post-snapshot in background after creating
# post-snapshot
BACKGROUND_COMPARISON="yes"
# run daily number cleanup
NUMBER_CLEANUP="yes"
# limit for number cleanup
NUMBER_MIN_AGE="1800"
NUMBER_LIMIT="100"
NUMBER_LIMIT_IMPORTANT="10"
# create hourly snapshots
TIMELINE_CREATE="yes"
# cleanup hourly snapshots after some time
TIMELINE_CLEANUP="yes"
# limits for timeline cleanup
TIMELINE_MIN_AGE="1800"
TIMELINE_LIMIT_HOURLY="24"
TIMELINE_LIMIT_DAILY="7"
TIMELINE_LIMIT_WEEKLY="4"
TIMELINE_LIMIT_MONTHLY="12"
TIMELINE_LIMIT_YEARLY="10"
# cleanup empty pre-post-pairs
EMPTY_PRE_POST_CLEANUP="yes"
# limits for empty pre-post-pair cleanup
EMPTY_PRE_POST_MIN_AGE="1800"
'';
};
in
mapAttrs snapperConfig cfg.snapperSubvols;
};
}
|
