Error file handling rewritten

OWS.py

@@ -151,15 +151,21 @@ class OWS:
         mapobj.shapepath = self.cachedir
         mapobj.setMetaData("wms_encoding","utf-8")
 
-        logging.debug("Setting ERRORFILE to %s"%self.config.get("MapServer","errorfile"))
-        if not os.path.exists(self.config.get("MapServer","errorfile")):
-            tmp = open(self.config.get("MapServer","errorfile"),"w")
+        errfile = self.config.get("MapServer","errorfile")
+        logging.debug("Setting ERRORFILE to %s"%errfile)
+        if not os.path.exists(errfile) and errfile != "stderr":
+            tmp = open(errfile,"w")
             tmp.close()
-        if os.access(self.config.get("MapServer","errorfile"), os.W_OK):
-            mapobj.setConfigOption("MS_ERRORFILE",self.config.get("MapServer","errorfile"))
+
+        # file
+        if os.access(errfile, os.W_OK):
+            mapobj.setConfigOption("MS_ERRORFILE",errfile)
+        # stderr
+        elif errfile == "stderr":
+            mapobj.setConfigOption("MS_ERRORFILE",errfile)
+        # no error file set
         else:
-            logging.warning("Cannot set ERRORFILE to %s: %s "%\
-                    (self.config.get("MapServer","errorfile"),"Write access denided"))
+            logging.warning("Cannot set ERRORFILE to %s: %s " % (errfile,"Write access denided"))
 
         logging.debug("Setting IMAGEPATH to %s"%self.config.get("MapServer","imagepath"))
         mapobj.web.imagepath=self.config.get("MapServer","imagepath")