script to sync between two machines via resync over ssh connection

cern_sync.sh

#!/bin/bash

# Define colors for logs
GREEN='\033[0;32m'
RED='\033[0;31m'
NC='\033[0m' # No color

log_info() { echo -e "${GREEN}[INFO]${NC} $1"; }
log_error() { echo -e "${RED}[ERROR]${NC} $1"; }

# Parse user inputs
REMOTE_USER="$1"
REMOTE_SERVER="$2"
REMOTE_PATH="$3"
LOCAL_PATH="$4"
SYNC_INTERVAL="${5:-10}"

# Validate local and remote paths
if [ ! -d "$LOCAL_PATH" ]; then
    log_info "Local path '$LOCAL_PATH' does not exist. Creating it."
    mkdir -p "$LOCAL_PATH"
fi

# Function to generate a checksum file list in a directory
generate_checksum() {
    find "$1" -type f ! -path "*/node_modules/*" -exec md5sum {} + 2>/dev/null | sort | md5sum | awk '{print $1}'
}

# Sync function from local to remote
sync_local_to_remote() {
    log_info "Syncing changes from local to remote"
    rsync -avz --exclude 'node_modules' "$LOCAL_PATH/" "${REMOTE_USER}@${REMOTE_SERVER}:${REMOTE_PATH}"
}

# Sync function from remote to local
sync_remote_to_local() {
    log_info "Syncing changes from remote to local"
    rsync -avz --exclude 'node_modules' "${REMOTE_USER}@${REMOTE_SERVER}:${REMOTE_PATH}/" "$LOCAL_PATH"
}

# Monitor changes based on checksum comparison
while true; do
    # Calculate local checksum
    local_checksum=$(generate_checksum "$LOCAL_PATH")

    # Retrieve and calculate remote checksum
    remote_checksum=$(ssh "$REMOTE_USER@$REMOTE_SERVER" "cd $REMOTE_PATH && find . -type f ! -path '*/node_modules/*' -exec md5sum {} + 2>/dev/null | sort | md5sum | awk '{print \$1}'")

    # Sync if checksums differ
    if [ "$local_checksum" != "$remote_checksum" ]; then
        log_info "Detected changes. Syncing..."
        sync_remote_to_local
        sync_local_to_remote
    else
        log_info "No changes detected. Skipping sync."
    fi

    # Wait before the next check
    sleep "$SYNC_INTERVAL"
done