From abcdc5adb1c890765ba0559a403c0cb8261c16be Mon Sep 17 00:00:00 2001
From: "Alexander A. Klimov" <alexander.klimov@netways.de>
Date: Fri, 5 Jun 2015 12:38:55 +0200
Subject: [PATCH] Fetch Git commit ID from .git/HEAD if available

refs #9247
---
 library/Icinga/Application/Version.php | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/library/Icinga/Application/Version.php b/library/Icinga/Application/Version.php
index c06eca2c2..70ad6cd63 100644
--- a/library/Icinga/Application/Version.php
+++ b/library/Icinga/Application/Version.php
@@ -15,6 +15,17 @@ class Version
      */
     public static function get()
     {
+        if (false !== ($gitHead = @file_get_contents((
+            $gitDir = Icinga::app()->getBaseDir('.git')
+        ) . DIRECTORY_SEPARATOR . 'HEAD'))) {
+            $matches = array();
+            if ((1 !== @preg_match('/(?<!.)ref:\s+(?P<gitCommitID>.+?)$/ms', $gitHead, $matches) || false !== (
+                $gitHead = @file_get_contents($gitDir . DIRECTORY_SEPARATOR . $matches['gitCommitID'])
+            )) && 1 === @preg_match('/(?<!.)(?P<gitCommitID>[0-9a-f]+)$/ms', $gitHead, $matches)) {
+                return $matches;
+            }
+        }
+
         if (false === ($appVersion = @file_get_contents(
             Icinga::app()->getApplicationDir() . DIRECTORY_SEPARATOR . 'VERSION'
         ))) {