oum update checks

pandora_console/update_manager_client/lib/UpdateManager/Client.php

@@ -1246,6 +1246,40 @@ class Client
     }
 
 
+    /**
+     * Compare version strings.
+     *
+     * @param string $version1 Version1.
+     * @param string $version2 Version2.
+     *
+     * @return array
+     * @throws \Exception On error.
+     */
+    private function compareVersions(string $version1, string $version2):int
+    {
+        $v1_components = explode('.', $version1);
+        $v2_components = explode('.', $version2);
+
+        $maxLength = max(count($v1_components), count($v2_components));
+
+        for ($i = 0; $i < $maxLength; $i++) {
+            $v1_part = isset($v1_components[$i]) === true ? intval($v1_components[$i]) : 0;
+            $v2_part = isset($v2_components[$i]) === true ? intval($v2_components[$i]) : 0;
+
+            if ($v1_part < $v2_part) {
+                // $version1 is older.
+                return -1;
+            } else if ($v1_part > $v2_part) {
+                // $version1 is newer.
+                return 1;
+            }
+        }
+
+        // Versions are identical.
+        return 0;
+    }
+
+
     /**
      * Update files.
      *
@@ -1284,6 +1318,30 @@ class Client
             throw new \Exception('Files are not readable');
         }
 
+        // External path to required versions file.
+        $filepath = $this->tmpDir.'/downloads/'.$version.'/required_um_versions.php';
+
+        if (file_exists($filepath) === true) {
+            include $filepath;
+
+            $curr_php_version = phpversion();
+            $curr_mysql_version = db_get_value_sql('SELECT VERSION() AS version');
+
+            if (isset($php_version) === true
+                && is_string($php_version) === true
+                && $this->compareVersions($curr_php_version, $php_version) < 0
+            ) {
+                throw new \Exception('PHP version >= '.$php_version.' is required');
+            }
+
+            if (isset($mysql_version) === true
+                && is_string($mysql_version) === true
+                && $this->compareVersions($curr_mysql_version, $mysql_version) < 0
+            ) {
+                throw new \Exception('MySQL version >= '.$mysql_version.' is required');
+            }
+        }
+
         $created_directories = [];
 
         while (($pf = readdir($pd)) !== false) {

pandora_console/update_manager_client/required_um_versions.php

@@ -0,0 +1,5 @@
+<?php
+
+// Versions must be specified as a string in the following formats: 8, 8.0.30, ...
+$php_version = '8';
+$mysql_version = '8';