From 97186c0361ddaba8a10534d89ab852aff3c726e5 Mon Sep 17 00:00:00 2001
From: Thomas Gelf <thomas@gelf.net>
Date: Tue, 11 Nov 2014 22:02:40 +0100
Subject: [PATCH] Webserver\Apache2: show hint with no mod_rewrite

This is yet unstyled, but still far better than 500

fixes #7643
---
 .../Icinga/Web/Setup/Webserver/Apache2.php    | 22 +++++++++++++------
 public/error_norewrite.html                   |  1 +
 2 files changed, 16 insertions(+), 7 deletions(-)
 create mode 100644 public/error_norewrite.html

diff --git a/library/Icinga/Web/Setup/Webserver/Apache2.php b/library/Icinga/Web/Setup/Webserver/Apache2.php
index 767e9a882..f878a23e8 100644
--- a/library/Icinga/Web/Setup/Webserver/Apache2.php
+++ b/library/Icinga/Web/Setup/Webserver/Apache2.php
@@ -38,13 +38,21 @@ Alias {webPath} "{publicPath}"
 
     EnableSendfile Off
 
-    RewriteEngine on
-    RewriteBase {webPath}/
-    RewriteCond %{REQUEST_FILENAME} -s [OR]
-    RewriteCond %{REQUEST_FILENAME} -l [OR]
-    RewriteCond %{REQUEST_FILENAME} -d
-    RewriteRule ^.*$ - [NC,L]
-    RewriteRule ^.*$ index.php [NC,L]
+    <IfModule mod_rewrite.c>
+        RewriteEngine on
+        RewriteBase {webPath}/
+        RewriteCond %{REQUEST_FILENAME} -s [OR]
+        RewriteCond %{REQUEST_FILENAME} -l [OR]
+        RewriteCond %{REQUEST_FILENAME} -d
+        RewriteRule ^.*$ - [NC,L]
+        RewriteRule ^.*$ index.php [NC,L]
+    </IfModule>
+
+    <IfModule !mod_rewrite.c>
+        DirectoryIndex error_norewrite.html
+        ErrorDocument 404 /error_norewrite.html
+    </IfModule>
+
 </Directory>
 EOD;
 
diff --git a/public/error_norewrite.html b/public/error_norewrite.html
new file mode 100644
index 000000000..d85a00205
--- /dev/null
+++ b/public/error_norewrite.html
@@ -0,0 +1 @@
+<h1>The rewrite module is not enabled</h1>