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tag.go
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tag.go
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package build
import (
"fmt"
"io"
"runtime"
"github.com/docker/distribution/reference"
"github.com/docker/docker/image"
"github.com/docker/docker/pkg/system"
"github.com/pkg/errors"
)
// Tagger is responsible for tagging an image created by a builder
type Tagger struct {
imageComponent ImageComponent
stdout io.Writer
repoAndTags []reference.Named
}
// NewTagger returns a new Tagger for tagging the images of a build.
// If any of the names are invalid tags an error is returned.
func NewTagger(backend ImageComponent, stdout io.Writer, names []string) (*Tagger, error) {
reposAndTags, err := sanitizeRepoAndTags(names)
if err != nil {
return nil, err
}
return &Tagger{
imageComponent: backend,
stdout: stdout,
repoAndTags: reposAndTags,
}, nil
}
// TagImages creates image tags for the imageID
func (bt *Tagger) TagImages(imageID image.ID) error {
for _, rt := range bt.repoAndTags {
// TODO @jhowardmsft LCOW support. Will need revisiting.
platform := runtime.GOOS
if system.LCOWSupported() {
platform = "linux"
}
if err := bt.imageComponent.TagImageWithReference(imageID, platform, rt); err != nil {
return err
}
fmt.Fprintf(bt.stdout, "Successfully tagged %s\n", reference.FamiliarString(rt))
}
return nil
}
// sanitizeRepoAndTags parses the raw "t" parameter received from the client
// to a slice of repoAndTag.
// It also validates each repoName and tag.
func sanitizeRepoAndTags(names []string) ([]reference.Named, error) {
var (
repoAndTags []reference.Named
// This map is used for deduplicating the "-t" parameter.
uniqNames = make(map[string]struct{})
)
for _, repo := range names {
if repo == "" {
continue
}
ref, err := reference.ParseNormalizedNamed(repo)
if err != nil {
return nil, err
}
if _, isCanonical := ref.(reference.Canonical); isCanonical {
return nil, errors.New("build tag cannot contain a digest")
}
ref = reference.TagNameOnly(ref)
nameWithTag := ref.String()
if _, exists := uniqNames[nameWithTag]; !exists {
uniqNames[nameWithTag] = struct{}{}
repoAndTags = append(repoAndTags, ref)
}
}
return repoAndTags, nil
}