setup-backup-cron.sh

#!/bin/bash
set -euo pipefail

# === CONFIGURATION ===
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BACKUP_SCRIPT="$SCRIPT_DIR/wp-backup.sh"
CRON_USER="$USER"

# === USAGE FUNCTION ===
usage() {
    cat << EOF
Usage: $0 [OPTIONS]

Setup automated WordPress backups using cron jobs.

OPTIONS:
    -h, --help              Show this help message
    -u, --user USER         User to run cron jobs as (default: current user)
    -w, --weekly            Setup weekly backups (default)
    -c, --cleanup           Remove existing backup cron jobs
    -l, --list              List current backup cron jobs

EXAMPLES:
    $0                      # Setup weekly backups (default)
    $0 -w                    # Setup weekly backups
    $0 -c                    # Remove all backup cron jobs
    $0 -l                    # List current backup cron jobs

EOF
}

# === VARIABLES ===
FREQUENCY="weekly"
CLEANUP=false
LIST_JOBS=false

# === PARSE ARGUMENTS ===
while [[ $# -gt 0 ]]; do
    case $1 in
        -h|--help)
            usage
            exit 0
            ;;
        -u|--user)
            CRON_USER="$2"
            shift 2
            ;;
        -w|--weekly)
            FREQUENCY="weekly"
            shift
            ;;
        -c|--cleanup)
            CLEANUP=true
            shift
            ;;
        -l|--list)
            LIST_JOBS=true
            shift
            ;;
        *)
            error_exit "Unknown option: $1"
            ;;
    esac
done

# === ERROR HANDLING ===
error_exit() {
    echo "ERROR: $1" >&2
    exit 1
}

# === VALIDATION ===
if [ ! -f "$BACKUP_SCRIPT" ]; then
    error_exit "Backup script not found: $BACKUP_SCRIPT"
fi

if [ ! -x "$BACKUP_SCRIPT" ]; then
    error_exit "Backup script is not executable: $BACKUP_SCRIPT"
fi

# === LIST CURRENT JOBS ===
if [ "$LIST_JOBS" = true ]; then
    echo "Current backup cron jobs for user '$CRON_USER':"
    if [ "$CRON_USER" = "$USER" ]; then
        crontab -l 2>/dev/null | grep -E "(wp-backup|wordpress.*backup)" || echo "  No backup cron jobs found"
    else
        sudo -u "$CRON_USER" crontab -l 2>/dev/null | grep -E "(wp-backup|wordpress.*backup)" || echo "  No backup cron jobs found"
    fi
    exit 0
fi

# === CLEANUP EXISTING JOBS ===
if [ "$CLEANUP" = true ]; then
    echo "Removing existing backup cron jobs for user '$CRON_USER'..."
    
    if [ "$CRON_USER" = "$USER" ]; then
        crontab -l 2>/dev/null | grep -v -E "(wp-backup|wordpress.*backup)" | crontab -
    else
        sudo -u "$CRON_USER" crontab -l 2>/dev/null | grep -v -E "(wp-backup|wordpress.*backup)" | sudo -u "$CRON_USER" crontab -
    fi
    
    echo "Backup cron jobs removed successfully."
    exit 0
fi

# === SETUP CRON JOB ===
echo "Setting up weekly WordPress backups for user '$CRON_USER'..."

# Create backup directory if it doesn't exist
sudo mkdir -p /var/backups/wordpress
sudo chown "$CRON_USER:$CRON_USER" /var/backups/wordpress

# Create log directory if it doesn't exist
sudo mkdir -p /var/log
sudo touch /var/log/wp-backup.log
sudo chown "$CRON_USER:$CRON_USER" /var/log/wp-backup.log
sudo chmod 644 /var/log/wp-backup.log

# Define cron schedule for weekly backups
CRON_SCHEDULE="0 2 * * 0"  # Weekly on Sunday at 2:00 AM

# Create cron job entry
CRON_JOB="$CRON_SCHEDULE cd $SCRIPT_DIR && $BACKUP_SCRIPT >> /var/log/wp-backup.log 2>&1"

# Add cron job
if [ "$CRON_USER" = "$USER" ]; then
    # Add to current user's crontab
    {
        crontab -l 2>/dev/null | grep -v -E "(wp-backup|wordpress.*backup)" || true
        echo "$CRON_JOB"
    } | crontab -
else
    # Add to specified user's crontab
    {
        sudo -u "$CRON_USER" crontab -l 2>/dev/null | grep -v -E "(wp-backup|wordpress.*backup)" || true
        echo "$CRON_JOB"
    } | sudo -u "$CRON_USER" crontab -
fi

echo "Backup cron job setup successfully!"
echo "Schedule: $CRON_SCHEDULE"
echo "User: $CRON_USER"
echo "Script: $BACKUP_SCRIPT"
echo "Log: /var/log/wp-backup.log"

# Show the current cron jobs
echo ""
echo "Current backup cron jobs:"
if [ "$CRON_USER" = "$USER" ]; then
    crontab -l | grep -E "(wp-backup|wordpress.*backup)" || echo "  No backup cron jobs found"
else
    sudo -u "$CRON_USER" crontab -l | grep -E "(wp-backup|wordpress.*backup)" || echo "  No backup cron jobs found"
fi

echo ""
echo "To test the backup manually, run:"
echo "  $BACKUP_SCRIPT"
echo ""
echo "To view backup logs, run:"
echo "  tail -f /var/log/wp-backup.log"
echo ""
echo "To remove backup cron jobs, run:"
echo "  $0 -c"