config: Allow btvars to be used as rtvar default values

This allows a single parameter to be specified that can be used at both
build-time and run-time. A btvar is defined and set as normal. And a
corresponding rtvar is defined with its default value set to the btvar
macro. The user can still override the rtvar at runtime if they want.

Example:

  buildex:
    btvars:
      MYPROP:
        type: string
        value: null
  build:
    mycomponent:
      params:
        myprop: ${btvar:MYPROP}
  run:
    rtvars:
      MYPROP:
        type: string
        value: ${btvar:MYPROP}
    params:
      -C myprop: ${rtvar:MYPROP}

Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/shrinkwrap/utils/config.py b/shrinkwrap/utils/config.py
index 0de5ff3..d55086c 100644
--- a/shrinkwrap/utils/config.py
+++ b/shrinkwrap/utils/config.py
@@ -653,6 +653,8 @@ def resolver(config, rtvars={}, clivars={}):
 		},
 		'artifact': {k: v['dst']
 				for k, v in config['artifacts'].items()},
+		'btvar': {k: v['value']
+				for k, v in config['buildex']['btvars'].items()},
 	}
 	for k in run['rtvars']:
 		v = run['rtvars'][k]