Fixed entrypoint to handle better updating of Agent mechanism

Updated Readme to show the --update flag

README.md

@@ -43,7 +43,7 @@ PatchMon provides centralized patch management across diverse server environment
 
 ### API & Integrations
 - REST API under `/api/v1` with JWT auth
-- **Proxmox LXC Auto-Enrollment** - Automatically discover and enroll LXC containers from Proxmox hosts ([Documentation](PROXMOX_AUTO_ENROLLMENT.md))
+- Proxmox LXC Auto-Enrollment - Automatically discover and enroll LXC containers from Proxmox hosts
 
 ### Security
 - Rate limiting for general, auth, and agent endpoints
@@ -85,11 +85,16 @@ apt-get upgrade -y
 apt install curl -y
 ```
 
-#### Script
+#### Install Script
 ```bash
 curl -fsSL -o setup.sh https://raw.githubusercontent.com/PatchMon/PatchMon/refs/heads/main/setup.sh && chmod +x setup.sh && bash setup.sh
 ```
 
+#### Update Script (--update flag)
+```bash
+curl -fsSL -o setup.sh https://raw.githubusercontent.com/PatchMon/PatchMon/refs/heads/main/setup.sh && chmod +x setup.sh && bash setup.sh --update
+```
+
 #### Minimum specs for building : #####
 CPU : 2 vCPU
 RAM : 2GB

docker/backend.docker-entrypoint.sh

@@ -8,19 +8,94 @@ log() {
     echo "[$(date +'%Y-%m-%d %H:%M:%S')] $*" >&2
 }
 
-# Copy files from agents_backup to agents if agents directory is empty and no .sh files are present
-if [ -d "/app/agents" ] && [ -z "$(find /app/agents -maxdepth 1 -type f -name '*.sh' | head -n 1)" ]; then
-    if [ -d "/app/agents_backup" ]; then
-        log "Agents directory is empty, copying from backup..."
-        cp -r /app/agents_backup/* /app/agents/
+# Function to extract version from agent script
+get_agent_version() {
+    local file="$1"
+    if [ -f "$file" ]; then
+        grep -m 1 '^AGENT_VERSION=' "$file" | cut -d'"' -f2 2>/dev/null || echo "0.0.0"
     else
-        log "Warning: agents_backup directory not found"
+        echo "0.0.0"
     fi
-else
-    log "Agents directory already contains files, skipping copy"
-fi
+}
 
-log "Starting PatchMon Backend (${NODE_ENV:-production})..."
+# Function to compare versions (returns 0 if $1 > $2)
+version_greater() {
+    # Use sort -V for version comparison
+    test "$(printf '%s\n' "$1" "$2" | sort -V | tail -n1)" = "$1" && test "$1" != "$2"
+}
+
+# Check and update agent files if necessary
+update_agents() {
+    local backup_agent="/app/agents_backup/patchmon-agent.sh"
+    local current_agent="/app/agents/patchmon-agent.sh"
+    
+    # Check if agents directory exists
+    if [ ! -d "/app/agents" ]; then
+        log "ERROR: /app/agents directory not found"
+        return 1
+    fi
+    
+    # Check if backup exists
+    if [ ! -d "/app/agents_backup" ]; then
+        log "WARNING: agents_backup directory not found, skipping agent update"
+        return 0
+    fi
+    
+    # Get versions
+    local backup_version=$(get_agent_version "$backup_agent")
+    local current_version=$(get_agent_version "$current_agent")
+    
+    log "Agent version check:"
+    log "  Image version: ${backup_version}"
+    log "  Volume version: ${current_version}"
+    
+    # Determine if update is needed
+    local needs_update=0
+    
+    # Case 1: No agents in volume (first time setup)
+    if [ -z "$(find /app/agents -maxdepth 1 -type f -name '*.sh' 2>/dev/null | head -n 1)" ]; then
+        log "Agents directory is empty - performing initial copy"
+        needs_update=1
+    # Case 2: Backup version is newer
+    elif version_greater "$backup_version" "$current_version"; then
+        log "Newer agent version available (${backup_version} > ${current_version})"
+        needs_update=1
+    else
+        log "Agents are up to date"
+        needs_update=0
+    fi
+    
+    # Perform update if needed
+    if [ $needs_update -eq 1 ]; then
+        log "Updating agents to version ${backup_version}..."
+        
+        # Create backup of existing agents if they exist
+        if [ -f "$current_agent" ]; then
+            local backup_timestamp=$(date +%Y%m%d_%H%M%S)
+            local backup_name="/app/agents/patchmon-agent.sh.backup.${backup_timestamp}"
+            cp "$current_agent" "$backup_name" 2>/dev/null || true
+            log "Previous agent backed up to: $(basename $backup_name)"
+        fi
+        
+        # Copy new agents
+        cp -r /app/agents_backup/* /app/agents/
+        
+        # Verify update
+        local new_version=$(get_agent_version "$current_agent")
+        if [ "$new_version" = "$backup_version" ]; then
+            log "✅ Agents successfully updated to version ${new_version}"
+        else
+            log "⚠️ Warning: Agent update may have failed (expected: ${backup_version}, got: ${new_version})"
+        fi
+    fi
+}
+
+# Main execution
+log "PatchMon Backend Container Starting..."
+log "Environment: ${NODE_ENV:-production}"
+
+# Update agents (version-aware)
+update_agents
 
 log "Running database migrations..."
 npx prisma migrate deploy