ansible: add grub.cfg hugepages regexp replace

when building the image in chroot we can't run
update-grub of grub-mkconfig because both commands
probe for root partitions, which doesn't work
in the chroot.

Instead we manually regexp replace the kernel boot
line in /boot/**/grub*.cfg

Change-Id: I31fac2a3db4d1d044f11357b1715119066509676
Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

2 files changed, 39 insertions, 0 deletions

diff --git a/ansible/roles/enable_hugepages_on_boot/tasks/main.yml b/ansible/roles/enable_hugepages_on_boot/tasks/main.yml
index c5c615bb3..29432d2e4 100755
--- a/ansible/roles/enable_hugepages_on_boot/tasks/main.yml
+++ b/ansible/roles/enable_hugepages_on_boot/tasks/main.yml
@@ -58,3 +58,7 @@
 - service:
     name: procps
     enabled: yes
+
+- include: manual_modify_grub.yml
+  # only tested on Ubuntu, kernel line is probably different on other distros
+  when: ansible_distribution == "Ubuntu"
diff --git a/ansible/roles/enable_hugepages_on_boot/tasks/manual_modify_grub.yml b/ansible/roles/enable_hugepages_on_boot/tasks/manual_modify_grub.yml
new file mode 100644
index 000000000..cac10e80e
--- /dev/null
+++ b/ansible/roles/enable_hugepages_on_boot/tasks/manual_modify_grub.yml
@@ -0,0 +1,35 @@
+# Copyright (c) 2017 Intel Corporation
+#
+# 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: find boot grub.cfg
+  find:
+    paths: /boot
+    file_type: file
+    patterns: 'grub*.cfg'
+    recurse: yes
+  register: grub_files
+
+
+- name: added hugepages to grub manually because we can't run update-grub in chroot
+  replace:
+    dest: "{{ item.path }}"
+    # console= should end the line
+    regexp: '(linux\s+/boot/vmlinuz.*console=\S+$)'
+    # default_hugepagesz=1G hugepagesz=1G hugepages=8
+    replace: '\1 default_hugepagesz={{ huge_pagesize_short[huge_pagesize_mb] }} hugepagesz={{ huge_pagesize_short[huge_pagesize_mb] }} hugepages={{ num_hugepages }}'
+  with_items: "{{ grub_files.files }}"
+
+
+
+