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package docker
import (
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"strings"
"github.com/containers/image/docker/reference"
"github.com/containers/image/image"
"github.com/containers/image/types"
"github.com/pkg/errors"
)
// Image is a Docker-specific implementation of types.ImageCloser with a few extra methods
// which are specific to Docker.
type Image struct {
types.ImageCloser
src *dockerImageSource
}
// newImage returns a new Image interface type after setting up
// a client to the registry hosting the given image.
// The caller must call .Close() on the returned Image.
func newImage(ctx context.Context, sys *types.SystemContext, ref dockerReference) (types.ImageCloser, error) {
s, err := newImageSource(sys, ref)
if err != nil {
return nil, err
}
img, err := image.FromSource(ctx, sys, s)
if err != nil {
return nil, err
}
return &Image{ImageCloser: img, src: s}, nil
}
// SourceRefFullName returns a fully expanded name for the repository this image is in.
func (i *Image) SourceRefFullName() string {
return i.src.ref.ref.Name()
}
// GetRepositoryTags list all tags available in the repository. The tag
// provided inside the ImageReference will be ignored. (This is a
// backward-compatible shim method which calls the module-level
// GetRepositoryTags)
func (i *Image) GetRepositoryTags(ctx context.Context) ([]string, error) {
return GetRepositoryTags(ctx, i.src.c.sys, i.src.ref)
}
// GetRepositoryTags list all tags available in the repository. The tag
// provided inside the ImageReference will be ignored.
func GetRepositoryTags(ctx context.Context, sys *types.SystemContext, ref types.ImageReference) ([]string, error) {
dr, ok := ref.(dockerReference)
if !ok {
return nil, errors.Errorf("ref must be a dockerReference")
}
path := fmt.Sprintf(tagsPath, reference.Path(dr.ref))
client, err := newDockerClientFromRef(sys, dr, false, "pull")
if err != nil {
return nil, errors.Wrap(err, "failed to create client")
}
tags := make([]string, 0)
for {
res, err := client.makeRequest(ctx, "GET", path, nil, nil, v2Auth)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
// print url also
return nil, errors.Errorf("Invalid status code returned when fetching tags list %d", res.StatusCode)
}
var tagsHolder struct {
Tags []string
}
if err = json.NewDecoder(res.Body).Decode(&tagsHolder); err != nil {
return nil, err
}
tags = append(tags, tagsHolder.Tags...)
link := res.Header.Get("Link")
if link == "" {
break
}
linkURLStr := strings.Trim(strings.Split(link, ";")[0], "<>")
linkURL, err := url.Parse(linkURLStr)
if err != nil {
return tags, err
}
// can be relative or absolute, but we only want the path (and I
// guess we're in trouble if it forwards to a new place...)
path = linkURL.Path
if linkURL.RawQuery != "" {
path += "?"
path += linkURL.RawQuery
}
}
return tags, nil
}
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