Add sync_with_git.sh

sync_with_git.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+# ==============================================================================
+# Script Description:
+# This script connects an existing local directory to a remote Git repository.
+# It requires the SSH URL of the Git repository as an input argument.
+# 
+# Process:
+# 1. Initializes a new local Git repository.
+# 2. Adds the provided URL as the remote 'origin'.
+# 3. Fetches the remote repository data.
+# 4. Checks for differences between the local files and 'origin/master'.
+# 5. If there are no differences, it sets up tracking for the master branch
+#    and performs a hard reset to synchronize exactly with the remote.
+#
+# Usage:
+#   ./connect_git.sh <repository-ssh-url>
+#
+# Example:
+#   ./connect_git.sh git@github.com:username/repository.git
+# ==============================================================================
+
+# Check if the repository URL argument is provided
+if [ -z "$1" ]; then
+    echo "Error: No repository SSH URL provided."
+    echo "Usage: $0 <repository-ssh-url>"
+    exit 1
+fi
+
+REPO_URL=$1
+BRANCH="master"
+
+echo "Initializing Git repository..."
+git init
+
+echo "Adding remote 'origin' -> $REPO_URL"
+git remote add origin "$REPO_URL"
+
+echo "Fetching from origin..."
+git fetch origin
+
+# Check differences between the local working directory and the remote branch.
+# Using 'git diff --quiet origin/master' safely checks without needing HEAD to exist.
+echo "Checking differences..."
+if git diff --quiet "origin/$BRANCH"; then
+    echo "No differences found between local folder and remote origin/$BRANCH."
+    
+    echo "Setting up tracking and aligning with remote..."
+    # Ensure we are on the master branch
+    git checkout -B "$BRANCH"
+    # Set the upstream tracking branch
+    git branch --set-upstream-to="origin/$BRANCH" "$BRANCH"
+    # Hard reset to match the remote exactly
+    git reset --hard "origin/$BRANCH"
+    
+    echo "Success! The local folder is now completely linked to the remote repository."
+else
+    echo "Notice: Differences exist between the local files and origin/$BRANCH."
+    echo "Tracking was not set automatically. You can review differences using:"
+    echo "  git diff origin/$BRANCH"
+    exit 1
+fi