ci: Add playbook to configure container host for image prep

.gitignore

@@ -13,6 +13,7 @@ build/
 dist/
 extra/
 tests/ansible/.*.pid
+tests/image_prep/logs
 docs/_build/
 htmlcov/
 *.egg-info

tests/image_prep/_container_host.yml

@@ -0,0 +1,5 @@
+- name: Setup container host
+  hosts: localhost
+  become: true
+  roles:
+    - role: container_host

tests/image_prep/roles/container_host/handlers/main.yml

@@ -0,0 +1,6 @@
+- name: Update GRUB
+  command: update-grub
+  changed_when: true
+
+- name: Reboot
+  reboot:

tests/image_prep/roles/container_host/tasks/main.yml

@@ -0,0 +1,27 @@
+# > If running `docker run --rm -it centos:centos6.7 bash` immediately exits
+# > with status code 139, check to see if your system has disabled vsyscall:
+# > ...
+# > If you do not see a vsyscall mapping, and you need to run a CentOS 6
+# > container, try adding vsyscall=emulated to the kernel options.
+# > -- https://hub.docker.com/_/centos
+
+- name: Check vsyscall enabled
+  command:
+    cmd: grep -c vsyscall /proc/self/maps
+  register: grep_self_maps_result
+  changed_when: false
+  check_mode: false
+  failed_when:
+    # 0 -> match, 1 -> no match, 2 -> error
+    - grep_self_maps_result.rc not in [0, 1]
+
+- name: Enable vsyscall
+  lineinfile:
+    path: /etc/default/grub
+    regexp: '^GRUB_CMDLINE_LINUX_DEFAULT.+'
+    line: GRUB_CMDLINE_LINUX_DEFAULT="quiet vsyscall=emulate"
+  when:
+    - grep_self_maps_result.rc != 0
+  notify:
+    - Update GRUB
+    - Reboot