forked from bblfsh/bblfshd
/
image.go
99 lines (81 loc) · 1.96 KB
/
image.go
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package runtime
import (
"strings"
"github.com/containers/image/image"
"github.com/containers/image/types"
)
// DriverImage represents a docker image of a driver
type DriverImage interface {
Name() string
Digest() (Digest, error)
Inspect() (*types.ImageInspectInfo, error)
WriteTo(path string) error
}
type driverImage struct {
imageRef string
ref types.ImageReference
}
// NewDriverImage returns a new DriverImage from an image reference.
// For Docker use `docker://bblfsh/rust-driver:latest`.
func NewDriverImage(imageRef string) (DriverImage, error) {
ref, err := ParseImageName(imageRef)
if err != nil {
return nil, err
}
return &driverImage{
imageRef: imageRef,
ref: ref,
}, nil
}
// Name returns the name of the driver image based on the image reference.
func (d *driverImage) Name() string {
return strings.TrimPrefix(d.ref.StringWithinTransport(), "//")
}
// Digest computes a digest based on the image layers.
func (d *driverImage) Digest() (Digest, error) {
img, err := d.image()
if err != nil {
return nil, err
}
defer img.Close()
i, err := img.Inspect()
if err != nil {
return nil, err
}
return ComputeDigest(i.Layers...), nil
}
func (d *driverImage) Inspect() (*types.ImageInspectInfo, error) {
img, err := d.image()
if err != nil {
return nil, err
}
defer img.Close()
return img.Inspect()
}
// WriteTo writes the image to disk at the given path.
func (d *driverImage) WriteTo(path string) error {
img, err := d.image()
if err != nil {
return err
}
defer img.Close()
if err := UnpackImage(img, path); err != nil {
return err
}
config, err := img.OCIConfig()
if err != nil {
return err
}
return WriteImageConfig(&ImageConfig{
Image: *config,
ImageRef: d.imageRef,
}, path)
}
func (d *driverImage) image() (types.Image, error) {
raw, err := d.ref.NewImageSource(nil)
if err != nil {
return nil, err
}
unparsedImage := image.UnparsedFromSource(raw)
return image.FromUnparsedImage(unparsedImage)
}