Golang List.Arches方法代码示例

// matchHostArchTools filters the given list of tools to the host architecture.
func matchHostArchTools(allTools tools.List) (tools.List, error) {
	arch := arch.HostArch()
	archTools, err := allTools.Match(tools.Filter{Arch: arch})
	if err == tools.ErrNoMatches {
		return nil, errors.Errorf(
			"need tools for arch %s, only found %s",
			arch, allTools.Arches(),
		)
	} else if err != nil {
		return nil, errors.Trace(err)
	}
	return archTools, nil
}

// bootstrapImageMetadata returns the image metadata to use for bootstrapping
// the given environment. If the environment provider does not make use of
// simplestreams, no metadata will be returned.
//
// If a bootstrap image ID is specified, image metadat will be synthesised
// using that image ID, and the architecture and series specified by the
// initiator. In addition, the custom image metadat that is saved into the
// state database will have the synthesised image metadata added to it.
func bootstrapImageMetadata(
	environ environs.Environ,
	availableTools coretools.List,
	bootstrapImageId string,
	customImageMetadata *[]*imagemetadata.ImageMetadata,
) ([]*imagemetadata.ImageMetadata, error) {

	hasRegion, ok := environ.(simplestreams.HasRegion)
	if !ok {
		if bootstrapImageId != "" {
			// We only support specifying image IDs for providers
			// that use simplestreams for now.
			return nil, errors.NotSupportedf(
				"specifying bootstrap image for %q provider",
				environ.Config().Type(),
			)
		}
		// No region, no metadata.
		return nil, nil
	}
	region, err := hasRegion.Region()
	if err != nil {
		return nil, errors.Trace(err)
	}

	if bootstrapImageId != "" {
		arches := availableTools.Arches()
		if len(arches) != 1 {
			return nil, errors.NotValidf("multiple architectures with bootstrap image")
		}
		allSeries := availableTools.AllSeries()
		if len(allSeries) != 1 {
			return nil, errors.NotValidf("multiple series with bootstrap image")
		}
		seriesVersion, err := series.SeriesVersion(allSeries[0])
		if err != nil {
			return nil, errors.Trace(err)
		}
		// The returned metadata does not have information about the
		// storage or virtualisation type. Any provider that wants to
		// filter on those properties should allow for empty values.
		meta := &imagemetadata.ImageMetadata{
			Id:         bootstrapImageId,
			Arch:       arches[0],
			Version:    seriesVersion,
			RegionName: region.Region,
			Endpoint:   region.Endpoint,
			Stream:     environ.Config().ImageStream(),
		}
		*customImageMetadata = append(*customImageMetadata, meta)
		return []*imagemetadata.ImageMetadata{meta}, nil
	}

	// For providers that support making use of simplestreams
	// image metadata, search public image metadata. We need
	// to pass this onto Bootstrap for selecting images.
	sources, err := environs.ImageMetadataSources(environ)
	if err != nil {
		return nil, errors.Trace(err)
	}
	imageConstraint := imagemetadata.NewImageConstraint(simplestreams.LookupParams{
		CloudSpec: region,
		Series:    availableTools.AllSeries(),
		Arches:    availableTools.Arches(),
		Stream:    environ.Config().ImageStream(),
	})
	publicImageMetadata, _, err := imagemetadata.Fetch(sources, imageConstraint)
	if err != nil {
		return nil, errors.Annotate(err, "searching image metadata")
	}
	return publicImageMetadata, nil
}