simple script to download a backup of wp site

simpleWPmigration.sh

#!/bin/bash

# Variables
BITNAMI_DIR="/home/bitnami"
STACK_DIR="$BITNAMI_DIR/stack/wordpress/wp-content"
DB_PASSWORD_FILE="$BITNAMI_DIR/bitnami_application_password"
DB_NAME="bitnami_wordpress"
USER=""
PASSWORD=""

# Check if required arguments are provided and get optional user argument
while getopts ":u:" opt; do
  case ${opt} in
    u )
      USER=$OPTARG
      ;;
    \? )
      echo "Invalid option: $OPTARG" 1>&2
      exit 1
      ;;
    : )
      echo "Invalid option: $OPTARG requires an argument" 1>&2
      exit 1
      ;;
  esac
done
shift $((OPTIND -1))

if [ $# -ne 1 ]; then
    echo "Usage: $0 [-u user] <url>"
    exit 1
fi

if [ -n "$USER" ]; then
    echo -n "Password: "
    read -sr PASSWORD
    echo
fi

URL=$1
ZIP_FILENAME=$(basename "$URL" | cut -d? -f1)

# Function to check if apt update/upgrade was done recently
is_update_needed() {
    # Define threshold for "recently" (e.g., 1 day)
    local threshold=$((24 * 60 * 60))  # 24 hours in seconds
    
    # Get timestamp of last update and current time
    local last_update=$(stat -c %Y /var/lib/apt/periodic/update-stamp)
    local current_time=$(date +%s)
    
    # Compare timestamps
    local time_diff=$((current_time - last_update))
    
    # Return true if update is needed (not done recently)
    ((time_diff > threshold))
}

# Check if commands exist
commands=("wget" "unzip" "mysql" "mysqldump" "wp")
for cmd in "${commands[@]}"; do
    if ! command -v cmd &> /dev/null; then        
        # Check if apt update is needed
        if is_update_needed; then
            # Update system packages
            echo "Performing apt update..."
            sudo apt update && sudo apt upgrade -y
        else
            echo "Skipping apt update (recently done)."
        fi

        # Install necessary packages
        sudo apt install -y unzip wget rsync apparmor-profiles apparmor-profiles-extra apparmor-utils 
    fi
done

# Error handling function
handle_error() {
    status=$?
    if [ $status -ne 0 ]; then
        echo "Error: Script failed at line $1"
        exit $status
    fi
}

# Download and unzip WordPress files
cd $BITNAMI_DIR || handle_error $LINENO
if [ -n "$USER" ]; then
    curl --user "$USER:$PASSWORD" "$URL" --output "$ZIP_FILENAME" || handle_error $LINENO
else
    curl "$URL" --output "$ZIP_FILENAME" || handle_error $LINENO
fi
unzip -q "$ZIP_FILENAME" "bitnami/wordpress/wp-content/*" "mwp_db/bitnami_wordpress.sql" -d $STACK_DIR || handle_error $LINENO

# Set appropriate permissions
sudo find $STACK_DIR -type f -exec chmod 664 {} \; || handle_error $LINENO
sudo find $STACK_DIR -type d -exec chmod 775 {} \; || handle_error $LINENO
sudo chown -R bitnami:daemon $STACK_DIR || handle_error $LINENO

# Import database
mysql -u root --password="$(< $DB_PASSWORD_FILE)" $DB_NAME < "$STACK_DIR/mwp_db/bitnami_wordpress.sql" || handle_error $LINENO

# Restart services
sudo /opt/bitnami/ctlscript.sh restart || handle_error $LINENO

# View MySQL logs
sudo grep "ERROR" /stack/mariadb/logs/mysqld.log || handle_error $LINENO

# Update WordPress core, plugins, and themes
sudo wp core update && sudo wp core update-db || handle_error $LINENO
sudo wp plugin update --all || handle_error $LINENO
sudo wp theme update --all || handle_error $LINENO

# Configure AppArmor
sudo wget -O /etc/apparmor.d/local/wordpress https://gist.githubusercontent.com/fintanmm/e50d8ad63a94137a73ab2bf558beef4a/raw/3facf8fa5d7c13f1332bce773d3984c98a08439b/wordpress || handle_error $LINENO

# Clean up
rm -rf "${STACK_DIR:?}/mwp_db/bitnami_wordpress.sql" "${BITNAMI_DIR:?}/${ZIP_FILENAME:?}" || handle_error $LINENO