multiconfig: implement initial support

This patch adds multiconfig support to kas by defining the
"BBMULTICONFIG" variable in the "local.conf" file.

Signed-off-by: Claudius Heine <ch@denx.de>

docs/format-changelog.rst

@@ -39,3 +39,12 @@ Added
 ~~~~~
 
 - ``Target`` key now allows to be a list of target names
+
+Version 5
+---------
+
+Changed behavior
+~~~~~~~~~~~~~~~~
+
+- Using ``multiconfig:*`` targets adds appropriate ``BBMULTICONFIG`` entries to
+  the ``local.conf`` automatically.

kas/__version__.py

@@ -28,5 +28,5 @@ __copyright__ = 'Copyright (c) Siemens AG, 2017'
 __version__ = '0.14.0'
 
 # Please update docs/format-changelog.rst when changing the file version.
-__file_version__ = 4
+__file_version__ = 5
 __compatible_file_version__ = 1

kas/config.py

@@ -269,6 +269,15 @@ class Config:
         return os.environ.get('KAS_DISTRO',
                               self._config.get('distro', 'poky'))
 
+    def get_multiconfig(self):
+        """
+            Returns the multiconfig array as bitbake string
+        """
+        return ' '.join(set(i.split(':')[1]
+                            for i in
+                            self.get_bitbake_targets()
+                            if i.startswith('multiconfig')))
+
     def get_gitlabci_config(self):
         """
             Returns the GitlabCI configuration

kas/libcmds.py

@@ -183,6 +183,8 @@ class WriteConfig(Command):
                 fds.write(config.get_local_conf_header())
                 fds.write('MACHINE ?= "{}"\n'.format(config.get_machine()))
                 fds.write('DISTRO ?= "{}"\n'.format(config.get_distro()))
+                fds.write('BBMULTICONFIG ?= "{}"\n'.format(
+                    config.get_multiconfig()))
 
         _write_bblayers_conf(config)
         _write_local_conf(config)