{ config, lib, pkgs, ... }: with lib; let cfg = config.services.postgresqlBackup; postgresqlBackupService = db: dumpCmd: { enable = true; description = "Backup of ${db} database(s)"; requires = [ "postgresql.service" ]; script = '' umask 0077 # ensure backup is only readable by postgres user if [ -e ${cfg.location}/${db}.sql.gz ]; then ${pkgs.coreutils}/bin/mv ${cfg.location}/${db}.sql.gz ${cfg.location}/${db}.prev.sql.gz fi ${dumpCmd} | \ ${pkgs.gzip}/bin/gzip -c > ${cfg.location}/${db}.sql.gz ''; serviceConfig = { Type = "oneshot"; User = "postgres"; }; startAt = cfg.startAt; }; in { options = { services.postgresqlBackup = { enable = mkOption { default = false; description = '' Whether to enable PostgreSQL dumps. ''; }; startAt = mkOption { default = "*-*-* 01:15:00"; description = '' This option defines (see systemd.time for format) when the databases should be dumped. The default is to update at 01:15 (at night) every day. ''; }; backupAll = mkOption { default = cfg.databases == []; defaultText = "services.postgresqlBackup.databases == []"; type = lib.types.bool; description = '' Backup all databases using pg_dumpall. This option is mutual exclusive to services.postgresqlBackup.databases. The resulting backup dump will have the name all.sql.gz. This option is the default if no databases are specified. ''; }; databases = mkOption { default = []; description = '' List of database names to dump. ''; }; location = mkOption { default = "/var/backup/postgresql"; description = '' Location to put the gzipped PostgreSQL database dumps. ''; }; pgdumpOptions = mkOption { type = types.separatedString " "; default = "-Cbo"; description = '' Command line options for pg_dump. This options is not used if config.services.postgresqlBackup.backupAll is enabled. Note that config.services.postgresqlBackup.backupAll is also active, when no databases where specified. ''; }; }; }; config = mkMerge [ { assertions = [{ assertion = cfg.backupAll -> cfg.databases == []; message = "config.services.postgresqlBackup.backupAll cannot be used together with config.services.postgresqlBackup.databases"; }]; } (mkIf cfg.enable { systemd.tmpfiles.rules = [ "d '${cfg.location}' 0700 postgres - - -" ]; }) (mkIf (cfg.enable && cfg.backupAll) { systemd.services.postgresqlBackup = postgresqlBackupService "all" "${config.services.postgresql.package}/bin/pg_dumpall"; }) (mkIf (cfg.enable && !cfg.backupAll) { systemd.services = listToAttrs (map (db: let cmd = "${config.services.postgresql.package}/bin/pg_dump ${cfg.pgdumpOptions} ${db}"; in { name = "postgresqlBackup-${db}"; value = postgresqlBackupService db cmd; }) cfg.databases); }) ]; }