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