Piwik\SettingsPiwik::getCurrentGitBranch PHP Method

    public static function getCurrentGitBranch()
    {
        $file = PIWIK_INCLUDE_PATH . '/.git/HEAD';
        if (!file_exists($file)) {
            return '';
        }
        $firstLineOfGitHead = file($file);
        if (empty($firstLineOfGitHead)) {
            return '';
        }
        $firstLineOfGitHead = $firstLineOfGitHead[0];
        $parts = explode('/', $firstLineOfGitHead);
        if (empty($parts[2])) {
            return '';
        }
        $currentGitBranch = trim($parts[2]);
        return $currentGitBranch;
    }

 /**
  * Initializes Profiling via XHProf.
  * See: https://github.com/piwik/piwik/blob/master/tests/README.xhprof.md
  */
 public static function setupProfilerXHProf($mainRun = false, $setupDuringTracking = false)
 {
     if (!$setupDuringTracking && SettingsServer::isTrackerApiRequest()) {
         // do not profile Tracker
         return;
     }
     if (self::$isXhprofSetup) {
         return;
     }
     $xhProfPath = PIWIK_INCLUDE_PATH . '/vendor/facebook/xhprof/extension/modules/xhprof.so';
     if (!file_exists($xhProfPath)) {
         throw new Exception("Cannot find xhprof, run 'composer install --dev' and build the extension.");
     }
     if (!function_exists('xhprof_enable')) {
         throw new Exception("Cannot find xhprof_enable, make sure to add 'extension={$xhProfPath}' to your php.ini.");
     }
     $outputDir = ini_get("xhprof.output_dir");
     if (empty($outputDir)) {
         throw new Exception("The profiler output dir is not set. Add 'xhprof.output_dir=...' to your php.ini.");
     }
     if (!is_writable($outputDir)) {
         throw new Exception("The profiler output dir '" . ini_get("xhprof.output_dir") . "' should exist and be writable.");
     }
     if (!function_exists('xhprof_error')) {
         function xhprof_error($out)
         {
             echo substr($out, 0, 300) . '...';
         }
     }
     $currentGitBranch = SettingsPiwik::getCurrentGitBranch();
     $profilerNamespace = "piwik";
     if ($currentGitBranch != 'master') {
         $profilerNamespace .= "-" . $currentGitBranch;
     }
     if ($mainRun) {
         self::setProfilingRunIds(array());
     }
     xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);
     register_shutdown_function(function () use($profilerNamespace, $mainRun) {
         $xhprofData = xhprof_disable();
         $xhprofRuns = new XHProfRuns_Default();
         $runId = $xhprofRuns->save_run($xhprofData, $profilerNamespace);
         if (empty($runId)) {
             die('could not write profiler run');
         }
         $runs = Profiler::getProfilingRunIds();
         array_unshift($runs, $runId);
         if ($mainRun) {
             Profiler::aggregateXhprofRuns($runs, $profilerNamespace, $saveTo = $runId);
             $baseUrlStored = SettingsPiwik::getPiwikUrl();
             $out = "\n\n";
             $baseUrl = "http://" . @$_SERVER['HTTP_HOST'] . "/" . @$_SERVER['REQUEST_URI'];
             if (strlen($baseUrlStored) > strlen($baseUrl)) {
                 $baseUrl = $baseUrlStored;
             }
             $baseUrl = $baseUrlStored . "vendor/facebook/xhprof/xhprof_html/?source={$profilerNamespace}&run={$runId}";
             $out .= "Profiler report is available at:\n";
             $out .= "<a href='{$baseUrl}'>{$baseUrl}</a>";
             $out .= "\n\n";
             if (Development::isEnabled()) {
                 $out .= "WARNING: Development mode is enabled. Many runtime optimizations are not applied in development mode. ";
                 $out .= "Unless you intend to profile Piwik in development mode, your profile may not be accurate.";
                 $out .= "\n\n";
             }
             echo $out;
         } else {
             Profiler::setProfilingRunIds($runs);
         }
     });
     self::$isXhprofSetup = true;
 }