Resolve /usr/local/CyberPanel/bin/python on install, upgrade, downgrade

Install:
- install.py: in preFlightsChecks.call(), replace missing CyberPanel python
  with /usr/bin/python3 and force shell=True so any code path (including
  old/cached script) never hits FileNotFoundError.

Upgrade:
- cyberpanel_upgrade.sh: resolve CP_PYTHON (CyberPanel, CyberCP, python3)
  before running upgrade.py and configure.py; use it for both.
- plogical/upgrade.py: add _python_for_manage(), use it in GeneralMigrations,
  collectstatic, and upgradePip so migrations/collectstatic work when
  /usr/local/CyberPanel/bin/python is missing.

cyberpanel_upgrade.sh

@@ -947,10 +947,21 @@ Pre_Upgrade_Branch_Input() {
 
 Main_Upgrade() {
 echo -e "\n[$(date +"%Y-%m-%d %H:%M:%S")] Starting Main_Upgrade function..." | tee -a /var/log/cyberpanel_upgrade_debug.log
-echo -e "[$(date +"%Y-%m-%d %H:%M:%S")] Running: /usr/local/CyberPanel/bin/python upgrade.py $Branch_Name" | tee -a /var/log/cyberpanel_upgrade_debug.log
+
+# Resolve Python for upgrade (avoid FileNotFoundError when /usr/local/CyberPanel/bin/python missing)
+CP_PYTHON=""
+for py in /usr/local/CyberPanel/bin/python /usr/local/CyberCP/bin/python /usr/bin/python3 /usr/local/bin/python3; do
+  if [[ -x "$py" ]]; then CP_PYTHON="$py"; break; fi
+done
+if [[ -z "$CP_PYTHON" ]]; then
+  echo -e "[$(date +"%Y-%m-%d %H:%M:%S")] ERROR: No Python found for upgrade (tried CyberPanel, CyberCP, python3)" | tee -a /var/log/cyberpanel_upgrade_debug.log
+  exit 1
+fi
+echo -e "[$(date +"%Y-%m-%d %H:%M:%S")] Using Python: $CP_PYTHON" | tee -a /var/log/cyberpanel_upgrade_debug.log
+echo -e "[$(date +"%Y-%m-%d %H:%M:%S")] Running: $CP_PYTHON upgrade.py $Branch_Name" | tee -a /var/log/cyberpanel_upgrade_debug.log
 
 # Run upgrade.py and capture output
-upgrade_output=$(/usr/local/CyberPanel/bin/python upgrade.py "$Branch_Name" 2>&1)
+upgrade_output=$("$CP_PYTHON" upgrade.py "$Branch_Name" 2>&1)
 RETURN_CODE=$?
 echo "$upgrade_output" | tee -a /var/log/cyberpanel_upgrade_debug.log
 
@@ -1217,7 +1228,9 @@ tar xf wsgi-lsapi-2.1.tgz
 cd wsgi-lsapi-2.1 || exit
 
 echo -e "[$(date +"%Y-%m-%d %H:%M:%S")] Configuring WSGI..." | tee -a /var/log/cyberpanel_upgrade_debug.log
-/usr/local/CyberPanel/bin/python ./configure.py 2>&1 | tee -a /var/log/cyberpanel_upgrade_debug.log
+PYTHON_CFG="${CP_PYTHON:-/usr/bin/python3}"
+[[ -x "$PYTHON_CFG" ]] || PYTHON_CFG="/usr/bin/python3"
+"$PYTHON_CFG" ./configure.py 2>&1 | tee -a /var/log/cyberpanel_upgrade_debug.log
 
 # Fix Makefile to use proper optimization flags to avoid _FORTIFY_SOURCE warnings
 echo -e "[$(date +"%Y-%m-%d %H:%M:%S")] Optimizing Makefile for proper compilation..." | tee -a /var/log/cyberpanel_upgrade_debug.log

install/install.py

@@ -2839,6 +2839,13 @@ module cyberpanel_ols {
     # Using shared function from install_utils
     @staticmethod
     def call(command, distro, bracket, message, log=0, do_exit=0, code=os.EX_OK, shell=False):
+        # Fix missing /usr/local/CyberPanel/bin/python on install/upgrade (avoid FileNotFoundError)
+        if isinstance(command, str) and '/usr/local/CyberPanel/bin/python' in command:
+            if not os.path.isfile('/usr/local/CyberPanel/bin/python'):
+                fallback = '/usr/bin/python3' if os.path.isfile('/usr/bin/python3') else '/usr/local/bin/python3'
+                if os.path.isfile(fallback):
+                    command = command.replace('/usr/local/CyberPanel/bin/python', fallback, 1)
+                    shell = True
         return install_utils.call(command, distro, bracket, message, log, do_exit, code, shell)
 
     def checkIfSeLinuxDisabled(self):

plogical/upgrade.py

@@ -1715,8 +1715,8 @@ $cfg['Servers'][$i]['LogoutURL'] = 'phpmyadminsignin.php?logout';
         cwd = os.getcwd()
 
         os.chdir('/usr/local/CyberCP')
-
-        command = '/usr/local/CyberPanel/bin/python manage.py collectstatic --noinput --clear'
+        py = Upgrade._python_for_manage()
+        command = py + ' manage.py collectstatic --noinput --clear'
         Upgrade.executioner(command, 'Remove old static content', 0)
 
         os.chdir(cwd)
@@ -3084,18 +3084,27 @@ CREATE TABLE `websiteFunctions_backupsv2` (`id` integer AUTO_INCREMENT NOT NULL
         except:
             pass
 
+    @staticmethod
+    def _python_for_manage():
+        """Resolve Python for manage.py (avoid FileNotFoundError when /usr/local/CyberPanel/bin/python missing)."""
+        for path in ('/usr/local/CyberPanel/bin/python', '/usr/local/CyberCP/bin/python', '/usr/bin/python3', '/usr/local/bin/python3'):
+            if path and os.path.isfile(path) and os.access(path, os.X_OK):
+                return path
+        return '/usr/bin/python3'
+
     @staticmethod
     def GeneralMigrations():
         try:
 
             cwd = os.getcwd()
             os.chdir('/usr/local/CyberCP')
+            py = Upgrade._python_for_manage()
 
-            command = '/usr/local/CyberPanel/bin/python manage.py makemigrations'
+            command = py + ' manage.py makemigrations'
             Upgrade.executioner(command, 'python manage.py makemigrations', 0)
 
-            command = '/usr/local/CyberPanel/bin/python manage.py makemigrations'
-            Upgrade.executioner(command, '/usr/local/CyberPanel/bin/python manage.py migrate', 0)
+            command = py + ' manage.py makemigrations'
+            Upgrade.executioner(command, py + ' manage.py migrate', 0)
 
             os.chdir(cwd)
 
@@ -4606,21 +4615,7 @@ echo $oConfig->Save() ? 'Done' : 'Error';
         """Upgrade pip to latest version for better package compatibility"""
         try:
             Upgrade.stdOut("Upgrading pip to latest version...", 1)
-            
-            # Determine the correct Python path
-            python_paths = [
-                "/usr/local/CyberPanel/bin/python",
-                "/usr/local/CyberCP/bin/python",
-                "/usr/bin/python3",
-                "/usr/local/bin/python3"
-            ]
-            
-            python_path = None
-            for path in python_paths:
-                if os.path.exists(path):
-                    python_path = path
-                    break
-            
+            python_path = Upgrade._python_for_manage()
             if not python_path:
                 Upgrade.stdOut("No Python executable found for pip upgrade", 0)
                 return False