279 lines
10 KiB
Nix
279 lines
10 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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# Type for a valid systemd unit option. Needed for correctly passing "timerConfig" to "systemd.timers"
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unitOption = (import ../../system/boot/systemd-unit-options.nix { inherit config lib; }).unitOption;
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in
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{
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options.services.restic.backups = mkOption {
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description = ''
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Periodic backups to create with Restic.
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'';
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type = types.attrsOf (types.submodule ({ name, ... }: {
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options = {
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passwordFile = mkOption {
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type = types.str;
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description = ''
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Read the repository password from a file.
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'';
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example = "/etc/nixos/restic-password";
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};
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s3CredentialsFile = mkOption {
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type = with types; nullOr str;
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default = null;
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description = ''
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file containing the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY
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for an S3-hosted repository, in the format of an EnvironmentFile
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as described by systemd.exec(5)
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'';
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};
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rcloneOptions = mkOption {
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type = with types; nullOr (attrsOf (oneOf [ str bool ]));
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default = null;
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description = ''
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Options to pass to rclone to control its behavior.
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See <link xlink:href="https://rclone.org/docs/#options"/> for
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available options. When specifying option names, strip the
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leading <literal>--</literal>. To set a flag such as
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<literal>--drive-use-trash</literal>, which does not take a value,
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set the value to the Boolean <literal>true</literal>.
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'';
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example = {
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bwlimit = "10M";
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drive-use-trash = "true";
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};
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};
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rcloneConfig = mkOption {
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type = with types; nullOr (attrsOf (oneOf [ str bool ]));
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default = null;
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description = ''
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Configuration for the rclone remote being used for backup.
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See the remote's specific options under rclone's docs at
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<link xlink:href="https://rclone.org/docs/"/>. When specifying
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option names, use the "config" name specified in the docs.
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For example, to set <literal>--b2-hard-delete</literal> for a B2
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remote, use <literal>hard_delete = true</literal> in the
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attribute set.
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Warning: Secrets set in here will be world-readable in the Nix
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store! Consider using the <literal>rcloneConfigFile</literal>
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option instead to specify secret values separately. Note that
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options set here will override those set in the config file.
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'';
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example = {
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type = "b2";
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account = "xxx";
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key = "xxx";
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hard_delete = true;
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};
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};
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rcloneConfigFile = mkOption {
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type = with types; nullOr path;
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default = null;
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description = ''
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Path to the file containing rclone configuration. This file
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must contain configuration for the remote specified in this backup
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set and also must be readable by root. Options set in
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<literal>rcloneConfig</literal> will override those set in this
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file.
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'';
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};
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repository = mkOption {
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type = types.str;
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description = ''
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repository to backup to.
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'';
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example = "sftp:backup@192.168.1.100:/backups/${name}";
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};
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paths = mkOption {
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type = types.nullOr (types.listOf types.str);
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default = null;
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description = ''
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Which paths to backup. If null or an empty array, no
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backup command will be run. This can be used to create a
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prune-only job.
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'';
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example = [
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"/var/lib/postgresql"
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"/home/user/backup"
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];
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};
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timerConfig = mkOption {
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type = types.attrsOf unitOption;
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default = {
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OnCalendar = "daily";
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};
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description = ''
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When to run the backup. See man systemd.timer for details.
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'';
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example = {
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OnCalendar = "00:05";
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RandomizedDelaySec = "5h";
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};
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};
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user = mkOption {
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type = types.str;
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default = "root";
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description = ''
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As which user the backup should run.
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'';
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example = "postgresql";
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};
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extraBackupArgs = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Extra arguments passed to restic backup.
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'';
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example = [
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"--exclude-file=/etc/nixos/restic-ignore"
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];
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};
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extraOptions = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Extra extended options to be passed to the restic --option flag.
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'';
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example = [
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"sftp.command='ssh backup@192.168.1.100 -i /home/user/.ssh/id_rsa -s sftp'"
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];
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};
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initialize = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Create the repository if it doesn't exist.
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'';
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};
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pruneOpts = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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A list of options (--keep-* et al.) for 'restic forget
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--prune', to automatically prune old snapshots. The
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'forget' command is run *after* the 'backup' command, so
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keep that in mind when constructing the --keep-* options.
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'';
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example = [
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"--keep-daily 7"
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"--keep-weekly 5"
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"--keep-monthly 12"
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"--keep-yearly 75"
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];
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};
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dynamicFilesFrom = mkOption {
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type = with types; nullOr str;
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default = null;
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description = ''
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A script that produces a list of files to back up. The
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results of this command are given to the '--files-from'
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option.
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'';
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example = "find /home/matt/git -type d -name .git";
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};
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};
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}));
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default = {};
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example = {
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localbackup = {
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paths = [ "/home" ];
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repository = "/mnt/backup-hdd";
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passwordFile = "/etc/nixos/secrets/restic-password";
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initialize = true;
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};
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remotebackup = {
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paths = [ "/home" ];
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repository = "sftp:backup@host:/backups/home";
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passwordFile = "/etc/nixos/secrets/restic-password";
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extraOptions = [
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"sftp.command='ssh backup@host -i /etc/nixos/secrets/backup-private-key -s sftp'"
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];
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timerConfig = {
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OnCalendar = "00:05";
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RandomizedDelaySec = "5h";
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};
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};
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};
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};
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config = {
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systemd.services =
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mapAttrs' (name: backup:
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let
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extraOptions = concatMapStrings (arg: " -o ${arg}") backup.extraOptions;
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resticCmd = "${pkgs.restic}/bin/restic${extraOptions}";
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filesFromTmpFile = "/run/restic-backups-${name}/includes";
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backupPaths = if (backup.dynamicFilesFrom == null)
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then if (backup.paths != null) then concatStringsSep " " backup.paths else ""
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else "--files-from ${filesFromTmpFile}";
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pruneCmd = optionals (builtins.length backup.pruneOpts > 0) [
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( resticCmd + " forget --prune " + (concatStringsSep " " backup.pruneOpts) )
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( resticCmd + " check" )
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];
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# Helper functions for rclone remotes
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rcloneRemoteName = builtins.elemAt (splitString ":" backup.repository) 1;
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rcloneAttrToOpt = v: "RCLONE_" + toUpper (builtins.replaceStrings [ "-" ] [ "_" ] v);
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rcloneAttrToConf = v: "RCLONE_CONFIG_" + toUpper (rcloneRemoteName + "_" + v);
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toRcloneVal = v: if lib.isBool v then lib.boolToString v else v;
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in nameValuePair "restic-backups-${name}" ({
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environment = {
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RESTIC_PASSWORD_FILE = backup.passwordFile;
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RESTIC_REPOSITORY = backup.repository;
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} // optionalAttrs (backup.rcloneOptions != null) (mapAttrs' (name: value:
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nameValuePair (rcloneAttrToOpt name) (toRcloneVal value)
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) backup.rcloneOptions) // optionalAttrs (backup.rcloneConfigFile != null) {
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RCLONE_CONFIG = backup.rcloneConfigFile;
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} // optionalAttrs (backup.rcloneConfig != null) (mapAttrs' (name: value:
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nameValuePair (rcloneAttrToConf name) (toRcloneVal value)
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) backup.rcloneConfig);
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path = [ pkgs.openssh ];
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restartIfChanged = false;
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serviceConfig = {
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Type = "oneshot";
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ExecStart = (optionals (backupPaths != "") [ "${resticCmd} backup --cache-dir=%C/restic-backups-${name} ${concatStringsSep " " backup.extraBackupArgs} ${backupPaths}" ])
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++ pruneCmd;
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User = backup.user;
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RuntimeDirectory = "restic-backups-${name}";
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CacheDirectory = "restic-backups-${name}";
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CacheDirectoryMode = "0700";
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} // optionalAttrs (backup.s3CredentialsFile != null) {
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EnvironmentFile = backup.s3CredentialsFile;
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};
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} // optionalAttrs (backup.initialize || backup.dynamicFilesFrom != null) {
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preStart = ''
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${optionalString (backup.initialize) ''
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${resticCmd} snapshots || ${resticCmd} init
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''}
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${optionalString (backup.dynamicFilesFrom != null) ''
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${pkgs.writeScript "dynamicFilesFromScript" backup.dynamicFilesFrom} > ${filesFromTmpFile}
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''}
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'';
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} // optionalAttrs (backup.dynamicFilesFrom != null) {
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postStart = ''
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rm ${filesFromTmpFile}
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'';
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})
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) config.services.restic.backups;
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systemd.timers =
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mapAttrs' (name: backup: nameValuePair "restic-backups-${name}" {
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wantedBy = [ "timers.target" ];
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timerConfig = backup.timerConfig;
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}) config.services.restic.backups;
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};
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}
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