Backup process to sync a directory to another system, RSYNC over SSH

cheap_rsync.sh

#!/bin/bash

# Source directory to be backed up
SOURCE_DIR=/data/MOVIES

# Destination directory for backup
DEST_DIR=/data/samba

# SSH configuration for remote server (if using rsync over ssh)
SSH_HOST=192.168.2.123
SSH_PORT=22
SSH_USER=bob

# File containing list of files and directories to exclude from backup
EXCLUDE_FILE=/data/exclude.txt

# Email notification configuration
EMAIL_NOTIFICATIONS=true
EMAIL_RECIPIENT=jason@gege.re

# Log file location
LOG_FILE=/var/log/backup.log

# Set up logging
log() {
    echo "$(date '+%Y-%m-%d %H:%M:%S') $1"
    echo "$(date '+%Y-%m-%d %H:%M:%S') $1" >> "$LOG_FILE"
}

# Send email notification with log file attachment
send_email() {
    if [ "$EMAIL_NOTIFICATIONS" = true ]; then
        echo "Sending email notification with compressed log file attachment..."
        gzip -c "$LOG_FILE" > "$LOG_FILE.gz"
        echo "See attached log file for backup details." | mail -s "Backup report from $(date +%Y-%m-%d)" -A "$LOG_FILE.gz" "$EMAIL_RECIPIENT"
        sendmail_exit_code=$?
        if [ $sendmail_exit_code -eq 0 ]; then
            log "Email notification sent successfully"
            # Clear log file
            > $LOG_FILE
            # Remove compressed log file
            rm "$LOG_FILE.gz"
        else
            log "ERROR: Failed to send email notification"
            exit $sendmail_exit_code
        fi
    fi
}

# Gracefully exit the script
exit_script() {
    echo "Exiting script..."
    if [ -n "$BACKUP_STATUS" ]; then
        send_email
    fi
    exit 1
}

# Set up trap to catch SIGINT signal (Ctrl+C) and exit gracefully
trap exit_script INT

# Main backup function
do_backup() {
    # Check source directory exists
    if [ ! -d "$SOURCE_DIR" ]; then
        log "ERROR: Source directory $SOURCE_DIR does not exist"
        BACKUP_STATUS="failed"
        return
    fi
    
    # Check if exclude file exists
    if [ ! -f "$EXCLUDE_FILE" ]; then
        log "ERROR: Exclude file $EXCLUDE_FILE does not exist"
        BACKUP_STATUS="failed"
        return
    fi
    
    # Check if destination directory exists on remote system
    ssh -q -p "$SSH_PORT" "$SSH_USER@$SSH_HOST" "stat $DEST_DIR > /dev/null 2>&1"
    if [ $? -ne 0 ]; then
        log "ERROR: Destination directory $DEST_DIR does not exist on remote system"
        BACKUP_STATUS="failed"
        return
    fi

    # Run rsync over ssh to copy files with progress display and file info
    #rsync -rtavz --delete --exclude-from="$EXCLUDE_FILE" --progress -e "ssh -p $SSH_PORT" "$SOURCE_DIR" "$SSH_USER@$SSH_HOST:$DEST_DIR" | tee -a $LOG_FILE
    rsync -rtavz --delete --exclude-from="$EXCLUDE_FILE" --progress -e "ssh -p $SSH_PORT" "$SOURCE_DIR" "$SSH_USER@$SSH_HOST:$DEST_DIR" 2>&1 | tee -a $LOG_FILE >/dev/null
    exit_code=$?

    # Check rsync completed successfully
    if [ $exit_code -eq 0 ]; then
        log "Backup completed successfully"
        BACKUP_STATUS="success"
    else
        log "ERROR: Backup failed with exit code $exit_code"
        BACKUP_STATUS="failed"
    fi
}

# Parse command-line arguments
while [[ $# -gt 0 ]]
do
    key="$1"
    case $key in
        -l|--log)
            LOG_FILE="$2"
            shift
            shift
            ;;
        *)
            echo "Unknown option: $key"
            exit 1
            ;;
    esac
done

# Run backup and send email notification
log "Starting backup"
BACKUP_STATUS=""
do_backup
send_email

# Check backup status and exit script with appropriate status code
if [ "$BACKUP_STATUS" = "success" ]; then
    exit 0
else
    exit 1
fi