modules/backup: init
Co-authored-by: b12f <b12f@noreply.git.pub.solar> Co-authored-by: Hendrik Sokolowski <hensoko@noreply.git.pub.solar>
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GPG key ID:
4FA1D3FA524F22C1
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@ -11,6 +11,7 @@
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self.nixosModules.unlock-zfs-on-boot
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self.nixosModules.core
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self.nixosModules.docker
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self.nixosModules.backups
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self.nixosModules.nginx
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self.nixosModules.collabora
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@ -49,6 +50,7 @@
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./flora-6
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self.nixosModules.overlays
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self.nixosModules.core
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self.nixosModules.backups
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self.nixosModules.keycloak
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self.nixosModules.caddy
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@ -68,6 +70,7 @@
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self.nixosModules.overlays
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self.nixosModules.unlock-zfs-on-boot
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self.nixosModules.core
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self.nixosModules.backups
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self.nixosModules.mail
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self.nixosModules.prometheus-exporters
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self.nixosModules.promtail
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@ -83,6 +86,7 @@
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./tankstelle
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self.nixosModules.overlays
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self.nixosModules.core
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self.nixosModules.backups
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self.nixosModules.prometheus-exporters
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self.nixosModules.promtail
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];
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274
modules/backups/default.nix
Normal file
274
modules/backups/default.nix
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@ -0,0 +1,274 @@
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{
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flake,
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config,
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lib,
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pkgs,
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...
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}:
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let
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utils = import "${flake.inputs.nixpkgs}/nixos/lib/utils.nix" {
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inherit lib;
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inherit config;
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inherit pkgs;
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};
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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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inherit (lib)
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literalExpression
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mkOption
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mkPackageOption
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types
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;
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in
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{
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options.pub-solar-os.backups = {
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repos = mkOption {
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description = ''
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Configuration of Restic repositories.
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'';
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type = types.attrsOf (
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types.submodule (
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{ name, ... }:
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{
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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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repository = 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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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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};
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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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remotebackup = {
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repository = "sftp:backup@host:/backups/home";
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passwordFile = "/etc/nixos/secrets/restic-password";
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};
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};
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};
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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 (
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types.submodule (
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{ name, ... }:
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{
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options = {
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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 = ''
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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 = ''
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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 = ''
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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 = ''
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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 = [ "--exclude-file=/etc/nixos/restic-ignore" ];
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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 = [ "sftp.command='ssh backup@192.168.1.100 -i /home/user/.ssh/id_rsa -s sftp'" ];
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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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runCheck = mkOption {
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type = types.bool;
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default = (builtins.length config.pub-solar-os.backups.backups.${name}.checkOpts > 0);
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defaultText = literalExpression ''builtins.length config.services.backups.${name}.checkOpts > 0'';
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description = "Whether to run the `check` command with the provided `checkOpts` options.";
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example = true;
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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 = ''
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A list of options for 'restic check'.
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'';
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example = [ "--with-cache" ];
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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. 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 = ''
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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 = ''
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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 = mkPackageOption pkgs "restic" { };
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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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)
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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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initialize = true;
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};
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remotebackup = {
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paths = [ "/home" ];
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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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};
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config = {
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services.restic.backups =
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let
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repos = config.pub-solar-os.backups.repos;
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backups = config.pub-solar-os.backups.backups;
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storeNames = builtins.attrNames repos;
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backupNames = builtins.attrNames backups;
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createBackups =
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backupName:
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map (storeName: {
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name = "${backupName}-${storeName}";
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value = repos."${storeName}" // backups."${backupName}";
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}) storeNames;
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in
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builtins.listToAttrs (lib.lists.flatten (map createBackups backupNames));
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};
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}
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