Ensure nginx config is present for ironic inspector

In an LXC deployment, nginx runs in both the ironc-api and
ironic-inspector containers. The api container can use ipxe to
boot the deployment and user images when `ironic_ipxe_enabled'
is true. The inspector container can use ipxe to independantly
serve the deploy images during inspection.

On a metal deployment these nginx instances are co-located on the
same host and share the same config files and directory structure
so no additional config is needed for inspectors nginx instance.

In an LXC depoyment the api and inspector containers need their
own individual nginx configuration to be written. This patch adds
that configuration for inspector.

A future patch could refactor the code so that only one set of
tasks is needed to deploy the nginx config to both inspector
and api.

Change-Id: Ida20e6835c6ca1c941fa76eadecf3d49e8b1239f

tasks/ironic_inspector_post_install.yml

@@ -42,3 +42,45 @@
     owner: "{{ ironic_system_user_name }}"
     group: "{{ ironic_system_group_name }}"
     mode: '0644'
+
+- name: Configure nginx when inspector boot mode is http
+  when: ironic_inspector_boot_mode == 'http'
+  block:
+
+    - name: Disable default nginx configuration
+      file:
+        path: /etc/nginx/sites-enabled/default
+        state: absent
+      notify:
+        - Restart web server
+
+    - name: Remove default nginx config
+      file:
+        path: /etc/nginx/conf.d/default.conf
+        state: absent
+      notify:
+        - Restart web server
+
+    - name: Ensure nginx configuration directories exist
+      file:
+        path: "{{ item }}"
+        state: directory
+      with_items:
+        - "/etc/nginx/{{ ironic_nginx_conf_path }}"
+
+    - name: Configure nginx virtual hosts
+      template:
+        src: ironic-ipxe.conf.j2
+        dest: "/etc/nginx/{{ ironic_nginx_conf_path }}/ironic-ipxe.conf"
+      notify:
+        - Restart web server
+
+    - name: Link to enable nginx virtual hosts
+      file:
+        src: "/etc/nginx/sites-available/ironic-ipxe.conf"
+        path: "/etc/nginx/sites-enabled/ironic-ipxe.conf"
+        state: link
+      when:
+        - ansible_facts['os_family'] == "Debian"
+      notify:
+        - Restart web server