add update_package_sources to distro class

Previously update_package_sources was a private class
(_update_package_sources).  The apt_update_upgrade class called it.

It does make sense that things would want to call this independently
of installing packages.  Therefore, expose it as a non hidden method.

1 files changed, 4 insertions, 0 deletions

diff --git a/cloudinit/distros/__init__.py b/cloudinit/distros/__init__.py
index c324ddf6..da4d0180 100644
--- a/cloudinit/distros/__init__.py
+++ b/cloudinit/distros/__init__.py
@@ -71,6 +71,10 @@ class Distro(object):
     def package_command(self, cmd, args=None):
         raise NotImplementedError()
 
+    @abc.abstractmethod
+    def update_package_sources(self):
+        raise NotImplementedError()
+
     def get_package_mirror(self):
         return self.get_option('package_mirror')