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package stream
import "fmt"
// FormatPrefix describes a stream+architecture combination, intended for prepending to error messages
func (st *Stream) FormatPrefix(archname string) string {
return fmt.Sprintf("%s/%s", st.Stream, archname)
}
// GetArchitecture loads the architecture-specific builds from a stream,
// with a useful descriptive error message if the architecture is not found.
func (st *Stream) GetArchitecture(archname string) (*Arch, error) {
archdata, ok := st.Architectures[archname]
if !ok {
return nil, fmt.Errorf("stream:%s does not have architecture '%s'", st.Stream, archname)
}
return &archdata, nil
}
// GetAwsRegionImage returns the release data (AMI and release ID) for a particular
// architecture and region.
func (st *Stream) GetAwsRegionImage(archname, region string) (*AwsRegionImage, error) {
starch, err := st.GetArchitecture(archname)
if err != nil {
return nil, err
}
awsimages := starch.Images.Aws
if awsimages == nil {
return nil, fmt.Errorf("%s: No AWS images", st.FormatPrefix(archname))
}
var regionVal AwsRegionImage
var ok bool
if regionVal, ok = awsimages.Regions[region]; !ok {
return nil, fmt.Errorf("%s: No AWS images in region %s", st.FormatPrefix(archname), region)
}
return ®ionVal, nil
}
// GetAMI returns the AWS machine image for a particular architecture and region.
func (st *Stream) GetAMI(archname, region string) (string, error) {
regionVal, err := st.GetAwsRegionImage(archname, region)
if err != nil {
return "", err
}
return regionVal.Image, nil
}
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