Allows new style config to be used for --flagfile

* includes tests
 * fixes bug 947549

Change-Id: Ibf319ea75a2d6156c5d8f1112cd58a33e5a98fe0

nova/compat/flagfile.py

@@ -97,6 +97,10 @@ def _read_flagfile(arg, next_arg, tempdir=None):
 
     args = _read_lines(flagfile)
 
+    if args and not args[0].startswith('--'):
+        # This is a config file, not a flagfile, so return it.
+        return ['--config-file=' + flagfile] + argp[1:]
+
     #
     # We're recursing here to convert any --flagfile arguments
     # read from this flagfile into --config-file arguments

nova/tests/test_compat_flagfile.py

@@ -18,7 +18,6 @@ import contextlib
 import os
 import shutil
 import StringIO
-import stubout
 import textwrap
 import tempfile
 import unittest
@@ -150,9 +149,15 @@ class CompatFlagfileTestCase(test.TestCase):
         self._do_test_flagfile('--noverbose', 'verbose=false\n')
 
     def test_flagfile_comments(self):
-        self._do_test_flagfile('--bar=foo\n#foo\n--foo=bar\n//bar',
+        self._do_test_flagfile(' \n\n#foo\n--bar=foo\n--foo=bar\n//bar',
                                'bar=foo\nfoo=bar\n')
 
+    def test_flagfile_is_config(self):
+        self.files['foo.flags'] = '\n\n#foo\n//bar\n[DEFAULT]\nbar=foo'
+        before = ['--flagfile=foo.flags']
+        after = flagfile.handle_flagfiles(before, tempdir=self.tempdir)
+        self.assertEquals(after, ['--config-file=foo.flags'])
+
     def test_flagfile_nested(self):
         self.files['bar.flags'] = '--foo=bar'