feat: 110 detect is installed via git

psalm-baseline.xml

@@ -1,19 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="4.22.0@fc2c6ab4d5fa5d644d8617089f012f3bb84b8703">
+<files psalm-version="4.23.0@f1fe6ff483bf325c803df9f510d09a03fd796f88">
   <file src="src/Classes/Config.php">
     <UndefinedVariable occurrences="1">
       <code>$configuration</code>
     </UndefinedVariable>
   </file>
-  <file src="src/Classes/DependencyBuilder.php">
-    <FalsableReturnStatement occurrences="1">
-      <code>false</code>
-    </FalsableReturnStatement>
-    <PossiblyNullArgument occurrences="1">
-      <code>$module</code>
-    </PossiblyNullArgument>
-  </file>
   <file src="src/Classes/IndexController.php">
+    <ForbiddenCode occurrences="1">
+      <code>shell_exec($command)</code>
+    </ForbiddenCode>
     <PossiblyNullReference occurrences="4">
       <code>getChangeLogMd</code>
       <code>getInstallationMd</code>

src/Classes/IndexController.php

@@ -137,6 +137,19 @@ public function invokeSelfUpdate()
             return $accessRedirect;
         }
 
+        $gitBranch = $this->getCurrentGitBranch(App::getRoot() . '/.git');
+
+        if ($gitBranch) {
+            Notification::pushFlashMessage([
+                'text' =>
+                    'Der MMLC wurde über Git installiert.<br>
+                    🔀 Branch: <strong>' . $gitBranch . '</strong><br>
+                    Bitte führe die Aktualisierung des MMLC über Git durch. Beachte, dass ein Update über den MMLC
+                    möglicherweise zu Fehlern führen kann.',
+                'type' => 'warning'
+            ]);
+        }
+
         // Nächste mögliche MMLC Version ermittlen
         $latest = Config::getSelfUpdate() == 'latest';
         $installedMmlcVersionString = App::getMmlcVersion();
@@ -737,4 +750,34 @@ private function addModuleNotFoundNotification($archiveName, $version = '')
             'type' => 'error'
         ]);
     }
+
+    private function getCurrentGitBranch(string $gitPath): ?string
+    {
+        if (!is_dir($gitPath)) {
+            return null;
+        }
+
+        $os = strtoupper(substr(PHP_OS, 0, 3));
+        $command = '';
+
+        switch ($os) {
+            case 'WIN':
+                $command = 'cd /d "' . $gitPath . '" & git symbolic-ref --short HEAD 2>NUL';
+                break;
+            case 'LIN':
+            case 'DAR':
+                $command = 'cd "' . $gitPath . '" && git symbolic-ref --short HEAD 2>/dev/null';
+                break;
+            default:
+                return 'unkown branch';
+        }
+
+        $output = trim('' . shell_exec($command));
+
+        if (empty($output)) {
+            return null;
+        }
+
+        return $output;
+    }
 }