#!/bin/sh
set -eu
umask 077

app_dir=$(CDPATH= cd -- "$(dirname "$0")/.." && pwd)
backup_dir="$HOME/backups/postgres"
backup="$backup_dir/postgres-latest.sql"
temporary="$backup.tmp.$$"

log() { logger -t miem-postgres-backup -- "$*" 2>/dev/null || true; }

mkdir -p "$backup_dir"
trap 'status=$?; rm -f -- "$temporary"; [ "$status" -eq 0 ] || log "backup failed"; exit "$status"' EXIT HUP INT TERM
cd "$app_dir"

docker compose exec -T postgres sh -c 'pg_dumpall -U "$POSTGRES_USER"' > "$temporary"
test -s "$temporary"
mv "$temporary" "$backup"
find "$HOME/backups/miem_workers" -maxdepth 1 -type f -name 'miem_workers-*.sql' -delete 2>/dev/null || true
log "created $backup"