discover: Add configuration methods
We'd like to be able to download petitboot configurations from other
sources (not just local files), but we'll need some way to indicate to
the parsers that a chunk of config data is from a specific source.
This change adds "configuration methods". At present, we have only one:
CONF_METHOD_LOCAL_FILE. For any incoming configuration data, we only run
parsers that have registered themselves with that configuration method.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
projects / petitboot / commit