402 lines
15 KiB
Nix
402 lines
15 KiB
Nix
{ config, lib, pkgs, utils, ... }:
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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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inherit (utils.systemdUtils.unitOptions) unitOption;
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in
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{
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options.services.restic.backups = mkOption {
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description = lib.mdDoc ''
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Periodic backups to create with Restic.
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'';
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type = types.attrsOf (types.submodule ({ config, name, ... }: {
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options = {
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passwordFile = mkOption {
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type = types.str;
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description = lib.mdDoc ''
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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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environmentFile = mkOption {
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type = with types; nullOr str;
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default = null;
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description = lib.mdDoc ''
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file containing the credentials to access the repository, in the
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format of an EnvironmentFile 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 = lib.mdDoc ''
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Options to pass to rclone to control its behavior.
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See <https://rclone.org/docs/#options> for
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available options. When specifying option names, strip the
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leading `--`. To set a flag such as
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`--drive-use-trash`, which does not take a value,
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set the value to the Boolean `true`.
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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 = lib.mdDoc ''
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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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<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 `--b2-hard-delete` for a B2
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remote, use `hard_delete = true` 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 `rcloneConfigFile`
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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 = lib.mdDoc ''
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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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`rcloneConfig` 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 = with types; nullOr str;
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default = null;
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description = lib.mdDoc ''
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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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repositoryFile = mkOption {
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type = with types; nullOr path;
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default = null;
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description = lib.mdDoc ''
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Path to the file containing the repository location to backup to.
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'';
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};
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paths = mkOption {
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# This is nullable for legacy reasons only. We should consider making it a pure listOf
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# after some time has passed since this comment was added.
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type = types.nullOr (types.listOf types.str);
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default = [ ];
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description = lib.mdDoc ''
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Which paths to backup, in addition to ones specified via
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`dynamicFilesFrom`. If null or an empty array and
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`dynamicFilesFrom` is also null, no backup command will be run.
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This can be used to create a 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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exclude = mkOption {
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type = types.listOf types.str;
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default = [ ];
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description = lib.mdDoc ''
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Patterns to exclude when backing up. See
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https://restic.readthedocs.io/en/latest/040_backup.html#excluding-files for
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details on syntax.
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'';
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example = [
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"/var/cache"
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"/home/*/.cache"
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".git"
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];
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};
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timerConfig = mkOption {
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type = types.nullOr (types.attrsOf unitOption);
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default = {
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OnCalendar = "daily";
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Persistent = true;
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};
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description = lib.mdDoc ''
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When to run the backup. See {manpage}`systemd.timer(5)` for
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details. If null no timer is created and the backup will only
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run when explicitly started.
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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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Persistent = true;
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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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checkOpts = mkOption {
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type = types.listOf types.str;
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default = [ ];
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description = lib.mdDoc ''
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A list of options for 'restic check', which is run after
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pruning.
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'';
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example = [
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"--with-cache"
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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 = lib.mdDoc ''
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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. The result is merged with paths specified via `paths`.
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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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backupPrepareCommand = mkOption {
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type = with types; nullOr str;
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default = null;
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description = lib.mdDoc ''
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A script that must run before starting the backup process.
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'';
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};
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backupCleanupCommand = mkOption {
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type = with types; nullOr str;
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default = null;
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description = lib.mdDoc ''
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A script that must run after finishing the backup process.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.restic;
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defaultText = literalExpression "pkgs.restic";
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description = lib.mdDoc ''
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Restic package to use.
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'';
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};
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createWrapper = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = ''
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Whether to generate and add a script to the system path, that has the same environment variables set
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as the systemd service. This can be used to e.g. mount snapshots or perform other opterations, without
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having to manually specify most options.
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'';
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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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exclude = [ "/home/*/.cache" ];
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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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assertions = mapAttrsToList (n: v: {
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assertion = (v.repository == null) != (v.repositoryFile == null);
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message = "services.restic.backups.${n}: exactly one of repository or repositoryFile should be set";
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}) config.services.restic.backups;
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systemd.services =
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mapAttrs'
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(name: backup:
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let
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extraOptions = concatMapStrings (arg: " -o ${arg}") backup.extraOptions;
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resticCmd = "${backup.package}/bin/restic${extraOptions}";
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excludeFlags = optional (backup.exclude != []) "--exclude-file=${pkgs.writeText "exclude-patterns" (concatStringsSep "\n" backup.exclude)}";
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filesFromTmpFile = "/run/restic-backups-${name}/includes";
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doBackup = (backup.dynamicFilesFrom != null) || (backup.paths != null && backup.paths != []);
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pruneCmd = optionals (builtins.length backup.pruneOpts > 0) [
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(resticCmd + " forget --prune " + (concatStringsSep " " backup.pruneOpts))
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(resticCmd + " check " + (concatStringsSep " " backup.checkOpts))
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];
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# Helper functions for rclone remotes
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rcloneRemoteName = builtins.elemAt (splitString ":" backup.repository) 1;
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rcloneAttrToOpt = v: "RCLONE_" + toUpper (builtins.replaceStrings [ "-" ] [ "_" ] v);
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rcloneAttrToConf = v: "RCLONE_CONFIG_" + toUpper (rcloneRemoteName + "_" + v);
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toRcloneVal = v: if lib.isBool v then lib.boolToString v else v;
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in
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nameValuePair "restic-backups-${name}" ({
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environment = {
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# not %C, because that wouldn't work in the wrapper script
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RESTIC_CACHE_DIR = "/var/cache/restic-backups-${name}";
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RESTIC_PASSWORD_FILE = backup.passwordFile;
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RESTIC_REPOSITORY = backup.repository;
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RESTIC_REPOSITORY_FILE = backup.repositoryFile;
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} // optionalAttrs (backup.rcloneOptions != null) (mapAttrs'
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(name: value:
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nameValuePair (rcloneAttrToOpt name) (toRcloneVal value)
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)
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backup.rcloneOptions) // optionalAttrs (backup.rcloneConfigFile != null) {
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RCLONE_CONFIG = backup.rcloneConfigFile;
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} // optionalAttrs (backup.rcloneConfig != null) (mapAttrs'
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(name: value:
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nameValuePair (rcloneAttrToConf name) (toRcloneVal value)
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)
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backup.rcloneConfig);
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path = [ config.programs.ssh.package ];
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restartIfChanged = false;
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wants = [ "network-online.target" ];
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after = [ "network-online.target" ];
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serviceConfig = {
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Type = "oneshot";
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ExecStart = (optionals doBackup [ "${resticCmd} backup ${concatStringsSep " " (backup.extraBackupArgs ++ excludeFlags)} --files-from=${filesFromTmpFile}" ])
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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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PrivateTmp = true;
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} // optionalAttrs (backup.environmentFile != null) {
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EnvironmentFile = backup.environmentFile;
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};
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} // optionalAttrs (backup.initialize || doBackup || backup.backupPrepareCommand != null) {
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preStart = ''
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${optionalString (backup.backupPrepareCommand != null) ''
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${pkgs.writeScript "backupPrepareCommand" backup.backupPrepareCommand}
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''}
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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.paths != null && backup.paths != []) ''
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cat ${pkgs.writeText "staticPaths" (concatStringsSep "\n" backup.paths)} >> ${filesFromTmpFile}
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''}
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${optionalString (backup.dynamicFilesFrom != null) ''
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${pkgs.writeScript "dynamicFilesFromScript" backup.dynamicFilesFrom} >> ${filesFromTmpFile}
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''}
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'';
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} // optionalAttrs (doBackup || backup.backupCleanupCommand != null) {
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postStop = ''
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${optionalString (backup.backupCleanupCommand != null) ''
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${pkgs.writeScript "backupCleanupCommand" backup.backupCleanupCommand}
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''}
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${optionalString doBackup ''
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rm ${filesFromTmpFile}
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''}
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'';
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})
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)
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config.services.restic.backups;
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systemd.timers =
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mapAttrs'
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(name: backup: nameValuePair "restic-backups-${name}" {
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wantedBy = [ "timers.target" ];
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timerConfig = backup.timerConfig;
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})
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(filterAttrs (_: backup: backup.timerConfig != null) config.services.restic.backups);
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# generate wrapper scripts, as described in the createWrapper option
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environment.systemPackages = lib.mapAttrsToList (name: backup: let
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extraOptions = lib.concatMapStrings (arg: " -o ${arg}") backup.extraOptions;
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resticCmd = "${backup.package}/bin/restic${extraOptions}";
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in pkgs.writeShellScriptBin "restic-${name}" ''
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set -a # automatically export variables
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${lib.optionalString (backup.environmentFile != null) "source ${backup.environmentFile}"}
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# set same environment variables as the systemd service
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${lib.pipe config.systemd.services."restic-backups-${name}".environment [
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(lib.filterAttrs (_: v: v != null))
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(lib.mapAttrsToList (n: v: "${n}=${v}"))
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(lib.concatStringsSep "\n")
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]}
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exec ${resticCmd} $@
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'') (lib.filterAttrs (_: v: v.createWrapper) config.services.restic.backups);
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};
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}
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