예제 #1
0
파일: tools.go 프로젝트: makyo/juju
// FindTools returns a List containing all tools in the given stream, with a given
// major.minor version number available in the cloud instance, filtered by filter.
// If minorVersion = -1, then only majorVersion is considered.
// If no *available* tools have the supplied major.minor version number, or match the
// supplied filter, the function returns a *NotFoundError.
func FindTools(env environs.Environ, majorVersion, minorVersion int, stream string,
	filter coretools.Filter) (list coretools.List, err error) {

	var cloudSpec simplestreams.CloudSpec
	switch env := env.(type) {
	case simplestreams.HasRegion:
		if cloudSpec, err = env.Region(); err != nil {
			return nil, err
		}
	case HasAgentMirror:
		if cloudSpec, err = env.AgentMirror(); err != nil {
			return nil, err
		}
	}
	// If only one of region or endpoint is provided, that is a problem.
	if cloudSpec.Region != cloudSpec.Endpoint && (cloudSpec.Region == "" || cloudSpec.Endpoint == "") {
		return nil, fmt.Errorf("cannot find tools without a complete cloud configuration")
	}

	logger.Infof("finding tools in stream %q", stream)
	if minorVersion >= 0 {
		logger.Infof("reading tools with major.minor version %d.%d", majorVersion, minorVersion)
	} else {
		logger.Infof("reading tools with major version %d", majorVersion)
	}
	defer convertToolsError(&err)
	// Construct a tools filter.
	// Discard all that are known to be irrelevant.
	if filter.Number != version.Zero {
		logger.Infof("filtering tools by version: %s", filter.Number)
	}
	if filter.Series != "" {
		logger.Infof("filtering tools by series: %s", filter.Series)
	}
	if filter.Arch != "" {
		logger.Infof("filtering tools by architecture: %s", filter.Arch)
	}
	sources, err := GetMetadataSources(env)
	if err != nil {
		return nil, err
	}
	return FindToolsForCloud(sources, cloudSpec, stream, majorVersion, minorVersion, filter)
}