Allow user to get iPXE files

Some distros may lack certain iPXE files. For these
special cases, download them from boot.ipxe.org.

Change-Id: I1f07e91ab109d1e59a377f1561a42fa9c0129405

playbooks/roles/bifrost-ironic-install/defaults/main.yml

@@ -126,6 +126,10 @@ inspector_port_addition: "pxe"
 # Note: inspector_keep_ports has three valid values: all, present, added
 inspector_keep_ports: "present"
 
+# We may not have packaged iPXE files on some distros, or may want to
+# download them on their own.
+download_ipxe: false
+
 # This enables installation of substrate for PXE driver support
 enable_pxe_drivers: true
 # Comma-separated list of PXE drivers to enable when

playbooks/roles/bifrost-ironic-install/tasks/create_tftpboot.yml

@@ -40,6 +40,9 @@
   copy: src=boot.ipxe dest=/httpboot/boot.ipxe owner=ironic group=ironic mode=0744
 - name: "Place tftp config file"
   copy: src=xinetd.tftp dest=/etc/xinetd.d/tftp
+- name: "Download ipxe files if asked"
+  include: get_ipxe.yml
+  when: download_ipxe | bool == true
 - name: "Copy iPXE image into place"
   copy: src={{ ipxe_dir }}/undionly.kpxe dest=/tftpboot/
 # NOTE(TheJulia): Copy full iPXE chain loader images in case they are required.

playbooks/roles/bifrost-ironic-install/tasks/get_ipxe.yml

@@ -0,0 +1,29 @@
+# Copyright (c) 2016 Hewlett Packard Enterprise Development LP.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+---
+- name: Create {{ ipxe_dir }}
+  file:
+    name={{ ipxe_dir }}
+    state=directory
+    owner=root
+    group=root
+    mode=0755
+- name: Get ipxe files
+  get_url:
+    url: "https://boot.ipxe.org/{{ item }}"
+    dest: "{{ ipxe_dir }}/{{ item }}"
+  with_items:
+    - undionly.kpxe
+    - ipxe.lkrn