def read_sources(sources_yaml):
"""Read boot resources config file.
:param sources_yaml: Path to a YAML file containing a list of boot
resource definitions.
:return: A dict representing the boot-resources configuration.
:raise NoConfigFile: If the configuration file was not present.
"""
# The config file is required. We do not fall back to defaults if it's
# not there.
try:
return BootSources.load(filename=sources_yaml)
except IOError as ex:
if ex.errno == errno.ENOENT:
# No config file. We have helpful error output for this.
raise NoConfigFile(ex)
else:
# Unexpected error.
raise
def parse_sources(sources_yaml):
"""Given a YAML `config` string, return a `BootSources` for it."""
return BootSources.parse(StringIO(sources_yaml))