67 lines
2.0 KiB
Nix
67 lines
2.0 KiB
Nix
# SPDX-FileCopyrightText: 2021 Simon Bruder <simon@sbruder.de>
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#
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# SPDX-License-Identifier: AGPL-3.0-or-later
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# This creates a backup of my media files when a specific hard drive is
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# hotplugged. The hard drive has a btrfs filesystem inside of a luks container.
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# The filesystem can be created with commands similar to this:
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# cryptsetup luksFormat --label="fuuko-media-backup-luks" --key-file=/path/to/key /dev/sdb
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# mkfs.btrfs -L "fuuko-media-backup" /dev/mapper/media-backup
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{ lib, pkgs, ... }:
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let
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baseDir = "/data/media";
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mountPoint = "/mnt/media-backup";
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in
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{
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# Systemd mount units do not support cryptsetup
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systemd.services.media-backup-luks = {
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after = [ ''dev-disk-by\x2dlabel-fuuko\x2dmedia\x2dbackup\x2dluks.device'' ];
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bindsTo = [ ''dev-disk-by\x2dlabel-fuuko\x2dmedia\x2dbackup\x2dluks.device'' ];
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unitConfig = {
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StopWhenUnneeded = true;
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};
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = "yes";
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ExecStart = "${pkgs.cryptsetup}/bin/cryptsetup open --type luks2 --key-file=${baseDir}/.backup-key /dev/disk/by-label/fuuko-media-backup-luks media-backup";
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ExecStop = "${pkgs.cryptsetup}/bin/cryptsetup close media-backup";
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};
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};
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systemd.mounts = lib.singleton {
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after = [ "media-backup-luks.service" ];
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bindsTo = [ "media-backup-luks.service" ];
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unitConfig = {
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StopWhenUnneeded = true;
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};
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what = "/dev/mapper/media-backup";
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where = mountPoint;
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};
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systemd.services.media-backup = {
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wantedBy = [ ''dev-disk-by\x2dlabel-fuuko\x2dmedia\x2dbackup\x2dluks.device'' ];
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unitConfig = {
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RequiresMountsFor = "/mnt/media-backup";
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};
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script = ''
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${pkgs.rsync}/bin/rsync \
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--archive \
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--delete \
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--links \
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--partial \
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--recursive\
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--verbose \
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${lib.escapeShellArg baseDir} \
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${lib.escapeShellArg mountPoint}
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'';
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serviceConfig = {
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IOSchedulingClass = "best-effort";
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IOSchedulingPriority = 7;
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Nice = 10;
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};
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};
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}
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