Make the networkd role distro agnostic

To make this role distro agnostic all of the variable configs have
been moved into defaults which will source private variables when
available using distro specific configs. This change will make it
possible to run this role on any distro, even if there's no distro
specific variable files.

Change-Id: I547edd2052c7e136b79d99e1b8e75e3aee68689d
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

defaults/main.yml

@@ -119,3 +119,24 @@ systemd_networks: []
 #   Cache: yes
 
 systemd_resolved: {}
+
+# Enable or Disable the availability of systemd-resolved. This option is a
+# Boolean variable.
+
+systemd_resolved_available: "{{ _systemd_resolved_available | default(true) }}"
+
+# Specify the command used to update the initramfs. By default this will run
+# "/bin/true" which is done because the command required to run should never
+# be assumed. Distro specific config is available in vars otherwise deployers
+# can set this as needed.
+
+systemd_networkd_update_initramfs: "{{ _systemd_networkd_update_initramfs | default('true') }}"
+
+# Provide a list of packages that are to be installed before this role is
+# executed.
+
+# _systemd_networkd_distro_packages:
+#  - systemd-networkd
+#  - systemd-resolved
+
+systemd_networkd_distro_packages: "{{ _systemd_networkd_distro_packages | default([]) }}"

vars/main.yml

@@ -15,6 +15,3 @@
 
 ## APT Cache options
 cache_timeout: 600
-
-# Supporting package required to make systemd-networkd function
-systemd_networkd_distro_packages: []

vars/redhat-7.yml

@@ -13,10 +13,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-systemd_networkd_distro_packages:
+_systemd_networkd_distro_packages:
   - systemd-networkd
   - systemd-resolved
 
-systemd_resolved_available: true
+_systemd_resolved_available: true
 
-systemd_networkd_update_initramfs: "dracut -f"
+_systemd_networkd_update_initramfs: "dracut -f"

vars/suse-42.yml

@@ -13,6 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-systemd_resolved_available: false
+_systemd_resolved_available: false
 
-systemd_networkd_update_initramfs: "dracut -f"
+_systemd_networkd_update_initramfs: "dracut -f"

vars/ubuntu.yml

@@ -13,6 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-systemd_resolved_available: true
+_systemd_resolved_available: true
 
-systemd_networkd_update_initramfs: "/usr/sbin/update-initramfs -u"
+_systemd_networkd_update_initramfs: "/usr/sbin/update-initramfs -u"