package formatter import ( "time" "github.com/docker/docker/api/types" "github.com/docker/docker/pkg/stringid" "github.com/docker/docker/reference" units "github.com/docker/go-units" ) const ( defaultImageTableFormat = "table {{.Repository}}\t{{.Tag}}\t{{.ID}}\t{{.CreatedSince}} ago\t{{.Size}}" defaultImageTableFormatWithDigest = "table {{.Repository}}\t{{.Tag}}\t{{.Digest}}\t{{.ID}}\t{{.CreatedSince}} ago\t{{.Size}}" imageIDHeader = "IMAGE ID" repositoryHeader = "REPOSITORY" tagHeader = "TAG" digestHeader = "DIGEST" ) // ImageContext contains image specific information required by the formater, encapsulate a Context struct. type ImageContext struct { Context Digest bool } func isDangling(image types.Image) bool { return len(image.RepoTags) == 1 && image.RepoTags[0] == ":" && len(image.RepoDigests) == 1 && image.RepoDigests[0] == "@" } // NewImageFormat returns a format for rendering an ImageContext func NewImageFormat(source string, quiet bool, digest bool) Format { switch source { case TableFormatKey: switch { case quiet: return defaultQuietFormat case digest: return defaultImageTableFormatWithDigest default: return defaultImageTableFormat } case RawFormatKey: switch { case quiet: return `image_id: {{.ID}}` case digest: return `repository: {{ .Repository }} tag: {{.Tag}} digest: {{.Digest}} image_id: {{.ID}} created_at: {{.CreatedAt}} virtual_size: {{.Size}} ` default: return `repository: {{ .Repository }} tag: {{.Tag}} image_id: {{.ID}} created_at: {{.CreatedAt}} virtual_size: {{.Size}} ` } } format := Format(source) if format.IsTable() && digest && !format.Contains("{{.Digest}}") { format += "\t{{.Digest}}" } return format } // ImageWrite writes the formatter images using the ImageContext func ImageWrite(ctx ImageContext, images []types.Image) error { render := func(format func(subContext subContext) error) error { return imageFormat(ctx, images, format) } return ctx.Write(&imageContext{}, render) } func imageFormat(ctx ImageContext, images []types.Image, format func(subContext subContext) error) error { for _, image := range images { images := []*imageContext{} if isDangling(image) { images = append(images, &imageContext{ trunc: ctx.Trunc, i: image, repo: "", tag: "", digest: "", }) } else { repoTags := map[string][]string{} repoDigests := map[string][]string{} for _, refString := range append(image.RepoTags) { ref, err := reference.ParseNamed(refString) if err != nil { continue } if nt, ok := ref.(reference.NamedTagged); ok { repoTags[ref.Name()] = append(repoTags[ref.Name()], nt.Tag()) } } for _, refString := range append(image.RepoDigests) { ref, err := reference.ParseNamed(refString) if err != nil { continue } if c, ok := ref.(reference.Canonical); ok { repoDigests[ref.Name()] = append(repoDigests[ref.Name()], c.Digest().String()) } } for repo, tags := range repoTags { digests := repoDigests[repo] // Do not display digests as their own row delete(repoDigests, repo) if !ctx.Digest { // Ignore digest references, just show tag once digests = nil } for _, tag := range tags { if len(digests) == 0 { images = append(images, &imageContext{ trunc: ctx.Trunc, i: image, repo: repo, tag: tag, digest: "", }) continue } // Display the digests for each tag for _, dgst := range digests { images = append(images, &imageContext{ trunc: ctx.Trunc, i: image, repo: repo, tag: tag, digest: dgst, }) } } } // Show rows for remaining digest only references for repo, digests := range repoDigests { // If digests are displayed, show row per digest if ctx.Digest { for _, dgst := range digests { images = append(images, &imageContext{ trunc: ctx.Trunc, i: image, repo: repo, tag: "", digest: dgst, }) } } else { images = append(images, &imageContext{ trunc: ctx.Trunc, i: image, repo: repo, tag: "", }) } } } for _, imageCtx := range images { if err := format(imageCtx); err != nil { return err } } } return nil } type imageContext struct { HeaderContext trunc bool i types.Image repo string tag string digest string } func (c *imageContext) ID() string { c.AddHeader(imageIDHeader) if c.trunc { return stringid.TruncateID(c.i.ID) } return c.i.ID } func (c *imageContext) Repository() string { c.AddHeader(repositoryHeader) return c.repo } func (c *imageContext) Tag() string { c.AddHeader(tagHeader) return c.tag } func (c *imageContext) Digest() string { c.AddHeader(digestHeader) return c.digest } func (c *imageContext) CreatedSince() string { c.AddHeader(createdSinceHeader) createdAt := time.Unix(int64(c.i.Created), 0) return units.HumanDuration(time.Now().UTC().Sub(createdAt)) } func (c *imageContext) CreatedAt() string { c.AddHeader(createdAtHeader) return time.Unix(int64(c.i.Created), 0).String() } func (c *imageContext) Size() string { c.AddHeader(sizeHeader) return units.HumanSizeWithPrecision(float64(c.i.Size), 3) }