change: logic in upgrade handling

agent-backup-tool/agent_tool_linux.py

@@ -227,17 +227,60 @@ class ZabbixAgentTool:
     
     def _upgrade_zabbix_package(self):
         """Upgrade Zabbix agent package based on distribution family"""
-        commands = {
-            'debian': ["sudo apt update", "sudo apt upgrade -y zabbix-agent*"],
-            'rhel': ["sudo yum update -y zabbix-agent* || sudo dnf update -y zabbix-agent*"]
-        }
-        
-        if self.distro_family not in commands:
-            raise Exception(f"Unsupported distribution family: {self.distro_family}")
-        
         logger.info(f"Upgrading Zabbix agent on {self.distro_family}-based system")
-        for cmd in commands[self.distro_family]:
-            self._run_command(cmd)
+        
+        if self.distro_family == 'debian':
+            # Update package lists
+            self._run_command("sudo apt update")
+            
+            # Check what zabbix packages are installed first
+            result = self._run_command("dpkg -l | grep -E 'zabbix-agent'", check=False, log_output=True)
+            if result.returncode != 0:
+                logger.warning("No Zabbix agent packages found installed")
+                return
+            
+            # Get list of installed zabbix agent packages
+            installed_packages = []
+            if result.stdout:
+                for line in result.stdout.strip().split('\n'):
+                    if 'zabbix-agent' in line:
+                        # Extract package name from dpkg output
+                        parts = line.split()
+                        if len(parts) >= 2:
+                            package_name = parts[1]
+                            installed_packages.append(package_name)
+            
+            if not installed_packages:
+                logger.warning("No Zabbix agent packages found to upgrade")
+                return
+            
+            # Upgrade each installed package individually
+            for package in installed_packages:
+                try:
+                    logger.info(f"Upgrading {package}")
+                    # Use DEBIAN_FRONTEND=noninteractive to avoid prompts
+                    self._run_command(f"sudo DEBIAN_FRONTEND=noninteractive apt upgrade -y {package}")
+                except Exception as e:
+                    logger.warning(f"Could not upgrade {package}: {e}")
+                    
+        elif self.distro_family == 'rhel':
+            # For RHEL-based systems
+            try:
+                # Try yum first
+                result = self._run_command("yum list installed | grep zabbix-agent", check=False)
+                if result.returncode == 0:
+                    self._run_command("sudo yum update -y zabbix-agent*")
+                else:
+                    # Try dnf
+                    result = self._run_command("dnf list installed | grep zabbix-agent", check=False)
+                    if result.returncode == 0:
+                        self._run_command("sudo dnf update -y zabbix-agent*")
+                    else:
+                        logger.warning("No Zabbix agent packages found to upgrade")
+            except Exception as e:
+                logger.warning(f"Could not upgrade packages: {e}")
+        else:
+            raise Exception(f"Unsupported distribution family: {self.distro_family}")
     
     def _merge_custom_settings(self, new_config_file, custom_settings, backup_path):
         """Merge custom settings into new configuration file"""