backup

bak.sh

#!/bin/bash

# Fix paths for crontab
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
TARGET_DIR="/home/rubus/backups"

# Error handling
set -euo pipefail
trap cleanup ERR SIGINT SIGTERM
cleanup() {
        local exit_code=$?
        if [[ $exit_code -ne 0 ]]; then
                date >> "$TARGET_DIR/errors.txt"
                echo $exit_code >> "$TARGET_DIR/errors.txt"
        fi
}

# Backup new file
ssh -i /home/rubus/.ssh/id_ed25519 citrus@orangepi3-lts.local "pg_dump -U citrus -d aq" > "$TARGET_DIR/aq_backup.tmp"

# Test temp file for content exists
[[ -s "$TARGET_DIR/aq_backup.tmp" ]]

# Rename to backup file only when valid
mv "$TARGET_DIR/aq_backup.tmp" "$TARGET_DIR/aq_backup_$(date +%Y%m%d%H%M%S).sql"

# If files > 8, remove the oldest file
count=$(find $TARGET_DIR -type f | grep backup | wc -l)
if [[ "$count" -gt 8 ]]; then
        oldest=$(find $TARGET_DIR -type f | grep backup | sort | head -n1)
        rm "${oldest}"
        echo "[INFO] Removed oldest: ${oldest}"
fi

0 3 * * * /bin/bash /home/rubus/backups/script.sh > /dev/null 2>&1