Allow to provide own repos.yaml file

Several people use Kolla behind firewall/proxy. Internal mirrors are
often in use then. We do not provide a way to replace repos.yaml file in
an easy way which may lead to complicated solutions or template
overrides.

This patch adds a way to provide own copy of repos.yaml file.

Change-Id: I0b07da22fea27e0ff4e90aaad19e50d84ff9a121

kolla/common/config.py

@@ -251,6 +251,8 @@ _CLI_OPTS = [
                 help='Show summary at the end of build'),
     cfg.StrOpt('image-name-prefix', default='',
                help='Prefix prepended to image names'),
+    cfg.StrOpt('repos-yaml', default='',
+               help='Path to alternative repos.yaml file'),
 ]
 
 _BASE_OPTS = [

kolla/image/build.py

@@ -611,6 +611,7 @@ class KollaWorker(object):
         self.use_dumb_init = conf.use_dumb_init
         self.base_tag = conf.base_tag
         self.tag = conf.tag
+        self.repos_yaml = conf.repos_yaml
         self.base_arch = conf.base_arch
         self.debian_arch = self.base_arch
         if self.base_arch == 'aarch64':
@@ -829,6 +830,7 @@ class KollaWorker(object):
                       'base_image': self.conf.base_image,
                       'base_distro_tag': self.base_tag,
                       'base_arch': self.base_arch,
+                      'repos_yaml': self.repos_yaml,
                       'use_dumb_init': self.use_dumb_init,
                       'base_package_type': self.base_package_type,
                       'debian_arch': self.debian_arch,

kolla/template/methods.py

@@ -91,7 +91,11 @@ def handle_repos(context, reponames, mode):
     if not isinstance(reponames, list):
         raise TypeError("First argument should be a list of repositories")
 
-    repofile = os.path.dirname(os.path.realpath(__file__)) + '/repos.yaml'
+    if context.get('repos_yaml'):
+        repofile = context.get('repos_yaml')
+    else:
+        repofile = os.path.dirname(os.path.realpath(__file__)) + '/repos.yaml'
+
     with open(repofile, 'r') as repos_file:
         repo_data = {}
         for name, params in yaml.safe_load(repos_file).items():

releasenotes/notes/user-provided-repos.yaml-d6e8583e9d9d01ef.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Added an `--repos-yaml` argument to allow user to provide own file with
+    definitions of external package repositories. Useful for those building
+    in offline environments with set of internal mirrors.