Allow to use own repos.y[a]ml file to build containers

Followup the I0b07da22fea27e0ff4e90aaad19e50d84ff9a121 from Kolla.
This change allow to use own repos.y[a]ml file to build containers.
Multiple Environments supported.

Change-Id: I0d7ab0d8ff5b16ac5de8e50e63400bd455996555
Signed-off-by: Maksim Malchuk <maksim.malchuk@gmail.com>

ansible/roles/kolla-build/tasks/main.yml

 ---
+- name: Set facts for repos.y[a]ml
+  set_fact:
+    repos_yaml_dest: "{{ kolla_build_config_path }}/repos.yml"
+    repos_yaml_sources: "{{ kolla_build_config_paths | product(['/kolla/repos.yaml', '/kolla/repos.yml']) | map('join') | unique | list }}"
+
+- name: Check for the presence of any custom repos.y[a]ml file
+  stat:
+    path: "{{ item }}"
+    get_md5: False
+    get_checksum: False
+    mime: False
+  with_items: "{{ repos_yaml_sources }}"
+  register: repos_yaml_stat
+
+- name: Set kolla_build_repos_yaml_path if any custom repos.y[a]ml file exists
+  set_fact:
+    kolla_build_repos_yaml_path: "{{ repos_yaml_dest }}"
+  when: repos_yaml_stat.results | map(attribute='stat.exists') | select | length > 0
+
+- name: Ensure the Kolla repos.yaml configuration file exists
+  merge_yaml:
+    sources: "{{ repos_yaml_sources }}"
+    dest: "{{ repos_yaml_dest }}"
+    mode: 0644
+  when: kolla_build_repos_yaml_path is defined
+
 - name: Ensure the Kolla build configuration file exists
   merge_configs:
     sources: "{{ kolla_build_config_paths | product(['/kolla/kolla-build.conf']) | map('join') | list }}"

ansible/roles/kolla-build/templates/kolla/kolla-build.conf

@@ -16,6 +16,10 @@ network_mode=host
 # Docker image tag to apply.
 tag={{ kolla_tag }}
 
+{% if kolla_build_repos_yaml_path is defined %}
+# Path to a file containing repos overrides.
+repos_yaml={{ kolla_build_repos_yaml_path }}
+{% endif %}
 # Path to a file containing template overrides.
 template_override={{ kolla_build_config_path }}/template-override.j2
 

doc/source/multiple-environments.rst

@@ -163,6 +163,7 @@ environment-specific and shared configuration file content:
 * ``kolla/config/bifrost/servers.yml``
 * ``kolla/globals.yml``
 * ``kolla/kolla-build.conf``
+* ``kolla/repos.yml`` or ``kolla/repos.yaml``
 
 Options in the environment-specific files take precedence over those in the
 shared files.

releasenotes/notes/user-provided-repos-yaml-07e1f872225059a6.yaml

+---
+features:
+  - |
+    Since Kolla containers can built with user provided ``repos.yaml`` Kayobe
+    can override the file with their own content. The override files can be
+    ``${KAYOBE_CONFIG_PATH}/kolla/repos.yaml`` (default Kolla filename) or
+    ``${KAYOBE_CONFIG_PATH}/kolla/repos.yml``. Multiple Environments supported.