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authorlassulus <lassulus@lassul.us>2018-04-20 23:35:35 +0200
committerlassulus <lassulus@lassul.us>2018-04-20 23:37:15 +0200
commit4fac738ed2092c8922b5126903bac3f258bf22f4 (patch)
treed8a629185be91b0cfd08cd28b924c0bb65413355 /lass/3modules/restic.nix
parentcc0dfeda397e812a9e6db2f65f6ed0a5a4d67571 (diff)
l: add restic service
Diffstat (limited to 'lass/3modules/restic.nix')
-rw-r--r--lass/3modules/restic.nix119
1 files changed, 119 insertions, 0 deletions
diff --git a/lass/3modules/restic.nix b/lass/3modules/restic.nix
new file mode 100644
index 000000000..c720793b1
--- /dev/null
+++ b/lass/3modules/restic.nix
@@ -0,0 +1,119 @@
+{ config, lib, pkgs, ... }:
+
+with import <stockholm/lib>;
+
+{
+ options.lass.restic = mkOption {
+ type = types.attrsOf (types.submodule ({ config, ... }: {
+ options = {
+ name = mkOption {
+ type = types.str;
+ default = config._module.args.name;
+ };
+ passwordFile = mkOption {
+ type = types.str;
+ default = toString <secrets/restic-password>;
+ description = ''
+ read the repository password from a file.
+ '';
+ example = "/etc/nixos/restic-password";
+
+ };
+ repo = mkOption {
+ type = types.str;
+ default = "sftp:backup@prism.r:/backups/${config.name}";
+ description = ''
+ repository to backup to.
+ '';
+ example = "sftp:backup@192.168.1.100:/backups/${config.name}";
+ };
+ dirs = mkOption {
+ type = types.listOf types.str;
+ default = [];
+ description = ''
+ which directories to backup.
+ '';
+ example = [
+ "/var/lib/postgresql"
+ "/home/user/backup"
+ ];
+ };
+ timerConfig = mkOption {
+ type = types.attrsOf types.str;
+ default = {
+ OnCalendar = "daily";
+ };
+ description = ''
+ When to run the backup. See man systemd.timer for details.
+ '';
+ example = {
+ OnCalendar = "00:05";
+ RandomizedDelaySec = "5h";
+ };
+ };
+ user = mkOption {
+ type = types.str;
+ default = "root";
+ description = ''
+ As which user the backup should run.
+ '';
+ example = "postgresql";
+ };
+ extraArguments = mkOption {
+ type = types.listOf types.str;
+ default = [];
+ description = ''
+ Extra arguments to append to the restic command.
+ '';
+ example = [
+ "sftp.command='ssh backup@192.168.1.100 -i /home/user/.ssh/id_rsa -s sftp"
+ ];
+ };
+ initialize = mkOption {
+ type = types.bool;
+ default = false;
+ description = ''
+ Create the repository if it doesn't exist.
+ '';
+ };
+ };
+ }));
+ default = {};
+ };
+
+ config = {
+ systemd.services =
+ mapAttrs' (_: plan:
+ let
+ extraArguments = concatMapStringsSep " " (arg: "-o ${arg}") plan.extraArguments;
+ connectTo = elemAt (splitString ":" plan.repo) 1;
+ resticCmd = "${pkgs.restic}/bin/restic ${extraArguments}";
+ in nameValuePair "backup.${plan.name}" {
+ environment = {
+ RESTIC_PASSWORD_FILE = plan.passwordFile;
+ RESTIC_REPOSITORY = plan.repo;
+ };
+ path = with pkgs; [
+ openssh
+ ];
+ restartIfChanged = false;
+ serviceConfig = {
+ ExecStartPre = mkIf plan.initialize (pkgs.writeScript "rustic-${plan.name}-init" ''
+ #! ${pkgs.bash}/bin/bash
+ ${resticCmd} snapshots || ${resticCmd} init
+ '');
+ ExecStart = pkgs.writeDash "rustic-${plan.name}" (
+ "#! ${pkgs.bash}/bin/bash\n" +
+ concatMapStringsSep "\n" (dir: "${resticCmd} backup ${dir}") plan.dirs
+ );
+ User = plan.user;
+ };
+ }
+ ) config.lass.restic;
+ systemd.timers =
+ mapAttrs' (_: plan: nameValuePair "backup.${plan.name}" {
+ wantedBy = [ "timers.target" ];
+ timerConfig = plan.timerConfig;
+ }) config.lass.restic;
+ };
+}