95 lines
2.1 KiB
Nix
95 lines
2.1 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 :
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{
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enable = true;
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description = "Backup of database ${db}";
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requires = [ "postgresql.service" ];
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preStart = ''
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mkdir -m 0700 -p ${cfg.location}
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chown postgres ${cfg.location}
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'';
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script = ''
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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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${config.services.postgresql.package}/bin/pg_dump ${cfg.pgdumpOptions} ${db} | \
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${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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PermissionsStartOnly = "true";
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User = "postgres";
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};
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startAt = cfg.period;
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};
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in {
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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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period = mkOption {
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default = "*-*-* 01:15:00";
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description = ''
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This option defines (in the format used by <literal>systemd.time</literal>) 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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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.string;
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default = "-Cbo";
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description = ''
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Command line options for pg_dump.
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'';
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};
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};
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};
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config = mkIf config.services.postgresqlBackup.enable {
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systemd.services = listToAttrs (map (db : {
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name = "postgresqlBackup-${db}";
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value = postgresqlBackupService db; } ) cfg.databases);
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};
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}
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