nix-config/modules/services/backup/default.nix
Bruno BELANYI ddeeb974a4
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modules: services: backup: remove deprecated name
2021-11-03 17:16:40 +01:00

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Nix

# Backups using Backblaze B2 and `restic`
{ config, pkgs, lib, ... }:
let
cfg = config.my.services.backup;
excludeArg = with builtins; with pkgs; "--exclude-file=" +
(writeText "excludes.txt" (concatStringsSep "\n" cfg.exclude));
in
{
options.my.services.backup = with lib; {
enable = mkEnableOption "Enable backups for this host";
repository = mkOption {
type = types.str;
example = "/mnt/backup-hdd";
description = "The repository to back up to";
};
passwordFile = mkOption {
type = types.str;
example = "/var/lib/restic/password.txt";
description = "Read the repository's password from this path";
};
credentialsFile = mkOption {
type = types.str;
example = "/var/lib/restic/creds.env";
description = ''
Credential file as an 'EnvironmentFile' (see `systemd.exec(5)`)
'';
};
paths = mkOption {
type = with types; listOf str;
default = [ ];
example = [
"/var/lib"
"/home"
];
description = "Paths to backup";
};
exclude = mkOption {
type = with types; listOf str;
default = [ ];
example = [
# very large paths
"/var/lib/docker"
"/var/lib/systemd"
"/var/lib/libvirt"
# temporary files created by `cargo` and `go build`
"**/target"
"/home/*/go/bin"
"/home/*/go/pkg"
];
description = "Paths to exclude from backup";
};
pruneOpts = mkOption {
type = with types; listOf str;
default = [
"--keep-last 10"
"--keep-hourly 24"
"--keep-daily 7"
"--keep-weekly 5"
"--keep-monthly 12"
"--keep-yearly 100"
];
example = [ "--keep-last 5" "--keep-weekly 2" ];
description = ''
List of options to give to the `forget` subcommand after a backup.
'';
};
timerConfig = mkOption {
# NOTE: I do not know how to cleanly set the type
default = {
OnCalendar = "daily";
};
example = {
OnCalendar = "00:05";
RandomizedDelaySec = "5h";
};
description = ''
When to run the backup. See man systemd.timer for details.
'';
};
};
config = lib.mkIf cfg.enable {
services.restic.backups.backblaze = {
# Take care of included and excluded files
paths = cfg.paths;
extraBackupArgs = [ "--verbose=2" ]
++ lib.optional (builtins.length cfg.exclude != 0) excludeArg
;
# Take care of creating the repository if it doesn't exist
initialize = true;
# give B2 API key securely
environmentFile = cfg.credentialsFile;
inherit (cfg) passwordFile pruneOpts timerConfig repository;
};
};
}