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nixos/pgbackup: Fix the postgres backup modules

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This commit is contained in:
Markus Kowalewski 2018-06-17 19:48:51 +02:00
parent f34b498bd2
commit baef643232
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1 changed files with 44 additions and 16 deletions
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60
nixos/modules/services/backup/postgresql-backup.nix
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@ -3,18 +3,41 @@
with lib;
let
inherit (pkgs) gzip;
location = config.services.postgresqlBackup.location;
cfg = config.services.postgresqlBackup;
postgresqlBackupCron = db:
''
${config.services.postgresqlBackup.period} root ${config.services.postgresql.package}/bin/pg_dump ${db} | ${gzip}/bin/gzip -c > ${location}/${db}.gz
'';
postgresqlBackupService = db :
{
enable = true;
in
description = "Backup of database ${db}";
{
requires = [ "postgresql.service" ];
preStart = ''
mkdir -m 0700 -p ${cfg.location}
chown postgres ${cfg.location}
'';
script = ''
if [ -e ${cfg.location}/${db}.sql.gz ]; then
${pkgs.coreutils}/bin/mv ${cfg.location}/${db}.sql.gz ${cfg.location}/${db}.prev.sql.gz
fi
${config.services.postgresql.package}/bin/pg_dump ${cfg.pgdumpOptions} ${db} | \
${pkgs.gzip}/bin/gzip -c > ${cfg.location}/${db}.sql.gz
'';
serviceConfig = {
Type = "oneshot";
PermissionsStartOnly = "true";
User = "postgres";
};
startAt = cfg.period;
};
in {
options = {
@ -28,9 +51,9 @@ in
};
period = mkOption {
default = "15 01 * * *";
default = "*-*-* 01:15:00";
description = ''
This option defines (in the format used by cron) when the
This option defines (in the format used by <literal>systemd.time</literal>) when the
databases should be dumped.
The default is to update at 01:15 (at night) every day.
'';
@ -49,18 +72,23 @@ in
Location to put the gzipped PostgreSQL database dumps.
'';
};
pgdumpOptions = mkOption {
type = types.string;
default = "-Cbo";
description = ''
Command line options for pg_dump.
'';
};
};
};
config = mkIf config.services.postgresqlBackup.enable {
services.cron.systemCronJobs = map postgresqlBackupCron config.services.postgresqlBackup.databases;
system.activationScripts.postgresqlBackup = stringAfter [ "stdio" "users" ]
''
mkdir -m 0700 -p ${config.services.postgresqlBackup.location}
chown root ${config.services.postgresqlBackup.location}
'';
systemd.services = listToAttrs (map (db : {
name = "postgresqlBackup-${db}";
value = postgresqlBackupService db; } ) cfg.databases);
};
}