MANTA-962 Add a user error for missing ini file

The configuration ini file is required, but there previously was no
check for the default ini file, which could be missing if an
installation problem occurs. This adds a simple check for the defualt
ini file, and improves the error message for missing default or custom
ini files.

Closes #79

src/python/lib/configureOptions.py

@@ -131,25 +131,29 @@ def updateIniSections(data,newData) :
                                      version=version, configHelp=configHelp)
         (options,args) = parser.parse_args()
 
-        if options.userConfigPath :
-            if not os.path.isfile(options.userConfigPath) :
-                raise OptParseException("Can't find config file: '%s'" % (options.userConfigPath))
+        try:
+            if options.userConfigPath :
+                if not os.path.isfile(options.userConfigPath) :
+                    raise OptParseException("Can't find config file: '%s'" % (options.userConfigPath))
 
-            updateIniSections(iniSections,getIniSections(options.userConfigPath))
+                updateIniSections(iniSections,getIniSections(options.userConfigPath))
 
-            # reparse with updated default values:
-            parser=self._getOptionParser(iniSections[primary_section],configFileName, cmdlineScriptDir,
-                                         version=version, configHelp=configHelp)
-            (options,args) = parser.parse_args()
+                # reparse with updated default values:
+                parser=self._getOptionParser(iniSections[primary_section],configFileName, cmdlineScriptDir,
+                                             version=version, configHelp=configHelp)
+                (options,args) = parser.parse_args()
+            else :
+                if not os.path.isfile(globalConfigPath) :
+                    raise OptParseException("Can't find default config file: '%s'" % (globalConfigPath))
 
-        if options.isAllHelp :
-            # this second call to getOptionParser is only here to provide the extended help option:
-            parser=self._getOptionParser(iniSections[primary_section],configFileName, cmdlineScriptDir, True,
-                                         version=version, configHelp=configHelp)
-            parser.print_help()
-            sys.exit(2)
 
-        try :
+            if options.isAllHelp :
+                # this second call to getOptionParser is only here to provide the extended help option:
+                parser=self._getOptionParser(iniSections[primary_section],configFileName, cmdlineScriptDir, True,
+                                             version=version, configHelp=configHelp)
+                parser.print_help()
+                sys.exit(2)
+
             nargs=len(args)
             if nargs :
                 plural=""