Add support for operating system families

Often it is convenient to classify a distro as being part of an
operating system family. for instance, file templates may be
identical for both debian and ubuntu, but to support this under
the current templating code, one would need multiple templates for the
same code.

Similarly, configuration handlers often fall into the same bucket: the
configuraton is known to work/has been tested on a particular family
of operating systems. right now this is handled with a declaration
like:

distros = ['fedora', 'rhel']

This fix seeks to address both of these issues. it allows for the
simplification of the above line to:

osfamilies = ['redhat']

It also provides a mechanism for operating system family templates.

1 files changed, 7 insertions, 2 deletions

diff --git a/cloudinit/stages.py b/cloudinit/stages.py
index 8d3213b4..d7d1dea0 100644
--- a/cloudinit/stages.py
+++ b/cloudinit/stages.py
@@ -529,11 +529,16 @@ class Modules(object):
                     freq = mod.frequency
                 if not freq in FREQUENCIES:
                     freq = PER_INSTANCE
-                worked_distros = mod.distros
+
+                worked_distros = set(mod.distros)
+                worked_distros.update(
+                    distros.Distro.expand_osfamily(mod.osfamilies))
+
                 if (worked_distros and d_name not in worked_distros):
                     LOG.warn(("Module %s is verified on %s distros"
                               " but not on %s distro. It may or may not work"
-                              " correctly."), name, worked_distros, d_name)
+                              " correctly."), name, list(worked_distros),
+                              d_name)
                 # Use the configs logger and not our own
                 # TODO(harlowja): possibly check the module
                 # for having a LOG attr and just give it back