Fix locale issues with date representations

This fixes #1214
Also fixes tests running on different locales

Signed-off-by: Valerij Maljulin <vmaljuli@redhat.com>

module_build_service/builder/KojiModuleBuilder.py

@@ -38,6 +38,7 @@ import kobo.rpmlib
 import threading
 import six.moves.xmlrpc_client as xmlrpclib
 import munch
+import locale
 from itertools import chain
 from OpenSSL.SSL import SysCallError
 import textwrap
@@ -51,7 +52,7 @@ from module_build_service.errors import ProgrammingError
 
 from module_build_service.builder.base import GenericBuilder
 from module_build_service.builder.KojiContentGenerator import KojiContentGenerator
-from module_build_service.utils import get_reusable_components, get_reusable_module
+from module_build_service.utils import get_reusable_components, get_reusable_module, set_locale
 
 logging.basicConfig(level=logging.DEBUG)
 
@@ -324,7 +325,8 @@ class KojiModuleBuilder(GenericBuilder):
         name = "module-build-macros"
         version = "0.1"
         release = "1"
-        today = datetime.date.today().strftime("%a %b %d %Y")
+        with set_locale(locale.LC_TIME, "en_US.utf8"):
+            today = datetime.date.today().strftime("%a %b %d %Y")
         mmd = module_build.mmd()
 
         # Generate "Conflicts: name = version-release". This is workaround for

module_build_service/utils/general.py

@@ -27,6 +27,8 @@ import functools
 import inspect
 import hashlib
 import time
+import locale
+import contextlib
 from datetime import datetime
 from functools import partial
 
@@ -761,3 +763,10 @@ def mmd_to_str(mmd):
     index = Modulemd.ModuleIndex()
     index.add_module_stream(mmd)
     return to_text_type(index.dump_to_string())
+
+
+@contextlib.contextmanager
+def set_locale(*args, **kwargs):
+    saved = locale.setlocale(locale.LC_ALL)
+    yield locale.setlocale(*args, **kwargs)
+    locale.setlocale(locale.LC_ALL, saved)