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image.go
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image.go
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package formatter
import (
"strconv"
"time"
"github.com/distribution/reference"
"github.com/docker/docker/api/types/image"
"github.com/docker/docker/pkg/stringid"
units "github.com/docker/go-units"
)
const (
defaultImageTableFormat = "table {{.Repository}}\t{{.Tag}}\t{{.ID}}\t{{if .CreatedSince }}{{.CreatedSince}}{{else}}N/A{{end}}\t{{.Size}}"
defaultImageTableFormatWithDigest = "table {{.Repository}}\t{{.Tag}}\t{{.Digest}}\t{{.ID}}\t{{if .CreatedSince }}{{.CreatedSince}}{{else}}N/A{{end}}\t{{.Size}}"
imageIDHeader = "IMAGE ID"
repositoryHeader = "REPOSITORY"
tagHeader = "TAG"
digestHeader = "DIGEST"
)
// ImageContext contains image specific information required by the formatter, encapsulate a Context struct.
type ImageContext struct {
Context
Digest bool
}
func isDangling(img image.Summary) bool {
if len(img.RepoTags) == 0 && len(img.RepoDigests) == 0 {
return true
}
return len(img.RepoTags) == 1 && img.RepoTags[0] == "<none>:<none>" && len(img.RepoDigests) == 1 && img.RepoDigests[0] == "<none>@<none>"
}
// 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 []image.Summary) error {
render := func(format func(subContext SubContext) error) error {
return imageFormat(ctx, images, format)
}
return ctx.Write(newImageContext(), render)
}
// needDigest determines whether the image digest should be ignored or not when writing image context
func needDigest(ctx ImageContext) bool {
return ctx.Digest || ctx.Format.Contains("{{.Digest}}")
}
func imageFormat(ctx ImageContext, images []image.Summary, format func(subContext SubContext) error) error {
for _, img := range images {
formatted := []*imageContext{}
if isDangling(img) {
formatted = append(formatted, &imageContext{
trunc: ctx.Trunc,
i: img,
repo: "<none>",
tag: "<none>",
digest: "<none>",
})
} else {
formatted = imageFormatTaggedAndDigest(ctx, img)
}
for _, imageCtx := range formatted {
if err := format(imageCtx); err != nil {
return err
}
}
}
return nil
}
func imageFormatTaggedAndDigest(ctx ImageContext, img image.Summary) []*imageContext {
repoTags := map[string][]string{}
repoDigests := map[string][]string{}
images := []*imageContext{}
for _, refString := range img.RepoTags {
ref, err := reference.ParseNormalizedNamed(refString)
if err != nil {
continue
}
if nt, ok := ref.(reference.NamedTagged); ok {
familiarRef := reference.FamiliarName(ref)
repoTags[familiarRef] = append(repoTags[familiarRef], nt.Tag())
}
}
for _, refString := range img.RepoDigests {
ref, err := reference.ParseNormalizedNamed(refString)
if err != nil {
continue
}
if c, ok := ref.(reference.Canonical); ok {
familiarRef := reference.FamiliarName(ref)
repoDigests[familiarRef] = append(repoDigests[familiarRef], c.Digest().String())
}
}
addImage := func(repo, tag, digest string) {
images = append(images, &imageContext{
trunc: ctx.Trunc,
i: img,
repo: repo,
tag: tag,
digest: digest,
})
}
for repo, tags := range repoTags {
digests := repoDigests[repo]
// Do not display digests as their own row
delete(repoDigests, repo)
if !needDigest(ctx) {
// Ignore digest references, just show tag once
digests = nil
}
for _, tag := range tags {
if len(digests) == 0 {
addImage(repo, tag, "<none>")
continue
}
// Display the digests for each tag
for _, dgst := range digests {
addImage(repo, tag, 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 {
addImage(repo, "<none>", dgst)
}
} else {
addImage(repo, "<none>", "")
}
}
return images
}
type imageContext struct {
HeaderContext
trunc bool
i image.Summary
repo string
tag string
digest string
}
func newImageContext() *imageContext {
imageCtx := imageContext{}
imageCtx.Header = SubHeaderContext{
"ID": imageIDHeader,
"Repository": repositoryHeader,
"Tag": tagHeader,
"Digest": digestHeader,
"CreatedSince": CreatedSinceHeader,
"CreatedAt": CreatedAtHeader,
"Size": SizeHeader,
"Containers": containersHeader,
"VirtualSize": SizeHeader, // Deprecated: VirtualSize is deprecated, and equivalent to Size.
"SharedSize": sharedSizeHeader,
"UniqueSize": uniqueSizeHeader,
}
return &imageCtx
}
func (c *imageContext) MarshalJSON() ([]byte, error) {
return MarshalJSON(c)
}
func (c *imageContext) ID() string {
if c.trunc {
return stringid.TruncateID(c.i.ID)
}
return c.i.ID
}
func (c *imageContext) Repository() string {
return c.repo
}
func (c *imageContext) Tag() string {
return c.tag
}
func (c *imageContext) Digest() string {
return c.digest
}
func (c *imageContext) CreatedSince() string {
createdAt := time.Unix(c.i.Created, 0)
if createdAt.IsZero() {
return ""
}
return units.HumanDuration(time.Now().UTC().Sub(createdAt)) + " ago"
}
func (c *imageContext) CreatedAt() string {
return time.Unix(c.i.Created, 0).String()
}
func (c *imageContext) Size() string {
return units.HumanSizeWithPrecision(float64(c.i.Size), 3)
}
func (c *imageContext) Containers() string {
if c.i.Containers == -1 {
return "N/A"
}
return strconv.FormatInt(c.i.Containers, 10)
}
// VirtualSize shows the virtual size of the image and all of its parent
// images. Starting with docker 1.10, images are self-contained, and
// the VirtualSize is identical to Size.
//
// Deprecated: VirtualSize is deprecated, and equivalent to [imageContext.Size].
func (c *imageContext) VirtualSize() string {
return units.HumanSize(float64(c.i.Size))
}
func (c *imageContext) SharedSize() string {
if c.i.SharedSize == -1 {
return "N/A"
}
return units.HumanSize(float64(c.i.SharedSize))
}
func (c *imageContext) UniqueSize() string {
if c.i.Size == -1 || c.i.SharedSize == -1 {
return "N/A"
}
return units.HumanSize(float64(c.i.Size - c.i.SharedSize))
}