The dump pipeline returned gzip's exit status, so a pg_dumpall that
died mid-stream still produced a valid .gz holding a truncated dump,
written straight to the final filename. The idempotency check then
blocked retries for the day and the corrupt file counted toward
retention, evicting a good backup each day until none remained.
- set -o pipefail so a failed pg_dumpall fails the pipeline
- dump to a .tmp file and atomically rename only after success, so
the final filename appears only for a complete backup
- gzip -t integrity check before publishing
- trap-based cleanup of the temp file; sweep stale temps at startup
- run retention only after a successful backup, with a glob
restricted to finished backups
- log timestamped OK/ERROR outcomes to /opt/so/log/postgres/backup.log
Mike Reeves
244a73b7a2