Add in an epoch_map

Allow the created epoch_map to start off from a configuration
value so that created packages (other than the core openstack
ones) can have an epoch set (flask seems to require this).

Change-Id: I3b0b23cf5dc99922bbe70c7095c3b5ceaad773b3

anvil/packaging/yum.py

@@ -90,8 +90,11 @@ class YumDependencyHandler(base.DependencyHandler):
 
     @property
     def py2rpm_helper(self):
-        epoch_map = dict([(name, self.OPENSTACK_EPOCH)
-                          for name in self.python_names or []])
+        epoch_map = self.distro.get_dependency_config("epoch_map", quiet=True)
+        if not epoch_map:
+            epoch_map = {}
+        epoch_map.update(dict([(name, self.OPENSTACK_EPOCH)
+                              for name in self.python_names or []]))
         package_map = self.distro.get_dependency_config("package_map")
         arch_dependent = self.distro.get_dependency_config("arch_dependent")
         return py2rpm_helper.Helper(epoch_map=epoch_map,

conf/distros/rhel.yaml

@@ -5,6 +5,8 @@ platform_pattern: redhat(.*)|centos(.*)
 install_helper: anvil.packaging.yum:YumInstallHelper
 dependency_handler:
     name: anvil.packaging.yum:YumDependencyHandler
+    epoch_map:
+        flask: 2
     package_map:
         distribute: python-setuptools
         django: Django