Restructuring/renaming DNS, DHCP, TFTP and netboot installer.

Idea: The role 'dnsmasq' and a new role 'dns-dhcp-tftp' are
drop-in replacements and interchangeable. 'netboot-installer'
works indepently of the role chosen for DNS, DHCP and TFTP.

roles/netboot-installer/defaults/main.yml

@@ -0,0 +1 @@
+tftp_root: "/var/lib/tftpboot"

roles/netboot-installer/handlers/main.yml

@@ -0,0 +1,15 @@
+- name: bind mount images
+  mount:
+    path: "{{ tftp_root }}/d-i/n-pkg/"
+    src: /usr/lib/debian-installer/
+    fstype: none
+    state: mounted
+    opts: bind
+  listen: bind mount images
+
+- name: rebuild di-netboot-assistant menu
+  command: "{{ item }}"
+  with_items:
+    - di-netboot-assistant rebuild-menu
+    - di-netboot-assistant rebuild-grub
+  listen: rebuild di-netboot-assistant menu

roles/netboot-installer/tasks/main.yml

@@ -0,0 +1,26 @@
+- name: make preseed directory available
+  file:
+    path: "{{ tftp_root }}/d-i/{{ di_dist }}"
+    state: directory
+
+- name: install di-netboot-assistant and installer package
+  apt:
+    name:
+      - di-netboot-assistant
+      - "{{ di_pkg }}"
+  notify:
+    - bind mount images
+    - rebuild di-netboot-assistant menu
+
+- name: provide preseed file
+  copy:
+    src: /usr/share/doc/di-netboot-assistant/examples/preseed.cfg
+    dest: "{{ tftp_root }}/d-i/{{ di_dist }}"
+    force: no
+    remote_src: yes
+
+- name: make the hostname resolvable from the LAN
+  replace:
+    path: /etc/hosts
+    regexp: '^(127\.0\.1\.1.*)$'
+    replace: '#\1\n{{ ipaddr_lan | ipaddr("address") }}	{{ ansible_hostname }}.{{ ansible_domain }}	{{ ansible_hostname }}'