roles/net-ifaces: Configure virtual net interfaces

The *net-ifaces* role manages a script that creates virtual network
interfaces, such as bridge, bond, and VLAN, that `dhcpcd`/`dhclient`
alone cannot. This provides a lightweight alternative to
*systemd-networkd* and *NetworkMangager*.

roles/net-ifaces/files/net-ifaces.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=Create virtual network interfaces
+Before=network.target network-online.target dhcpcd.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/libexec/net-ifaces.sh
+RemainAfterExit=true
+
+[Install]
+WantedBy=network.target

roles/net-ifaces/handlers/main.yml

@@ -0,0 +1,2 @@
+- name: reload systemd
+  command: systemctl daemon-reload

roles/net-ifaces/tasks/main.yml

@@ -0,0 +1,17 @@
+- name: ensure net-ifaces script is installed
+  copy:
+    src={{ inventory_hostname }}.sh
+    dest=/usr/local/libexec/net-ifaces.sh
+    mode=0755
+
+- name: ensure net-ifaces systemd unit is installed
+  copy:
+    src=net-ifaces.service
+    dest=/etc/systemd/system/net-ifaces.service
+    mode=0644
+  notify: reload systemd
+
+- name: ensure net-ifaces service starts at boot
+  service:
+    name=net-ifaces
+    enabled=yes