Blame SOURCES/httpd-2.4.6-r1506474.patch

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--- a/server/core.c	2013/07/24 09:49:38	1506473
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+++ b/server/core.c	2013/07/24 09:51:14	1506474
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@@ -1481,7 +1481,9 @@
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             conf->ap_document_root = arg;
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         }
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         else {
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-            return "DocumentRoot must be a directory";
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+            return apr_psprintf(cmd->pool, 
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+                                "DocumentRoot '%s' is not a directory, or is not readable",
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+                                arg);
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         }
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     }
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     return NULL;