tree 9cf7685049fa596751ddbc70abe970103077609f
parent aa53d49d0914619c4f02d84da390ab8ad44d29c7
author Dennis Dmitriev <ddmitriev@mirantis.com> 1528372359 +0300
committer Dennis Dmitriev <ddmitriev@mirantis.com> 1528378262 +0300

Add possibility to override values from INI files with env variables

Originally, environment variables were used only to replace
default values. But if the tests are run using existing INI like:

export TESTS_CONFIGS=$(pwd)/test_salt_deployed.ini

, all enviromnet variables were ignored in favor of values from INI.

This patch improves the ordering:

- environment variables now override the values from INI and from
  defaults
- on start, now are printed only the values that were read from
  environment variables

Any of the parameter from settings_oslo.py that is registered
to 'config' object, can be set using environment variables, in
upper- or lower-case:

export SALT_MASTER_HOST=192.168.100.90
export salt_master_host=192.168.100.90

Change-Id: Ia7b7d0043c633d89a582f90b0eed021d52626733