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package image
import (
"context"
"time"
"github.com/containers/image/v5/docker/reference"
)
// DiskUsageStat gives disk-usage statistics for a specific image.
type DiskUsageStat struct {
// ID of the image.
ID string
// Repository of the first recorded name of the image.
Repository string
// Tag of the first recorded name of the image.
Tag string
// Created is the creation time of the image.
Created time.Time
// SharedSize is the amount of space shared with another image.
SharedSize uint64
// UniqueSize is the amount of space used only by this image.
UniqueSize uint64
// Size is the total size of the image (i.e., the sum of the shared and
// unique size).
Size uint64
// Number of containers using the image.
Containers int
}
// DiskUsage returns disk-usage statistics for the specified slice of images.
func (ir *Runtime) DiskUsage(ctx context.Context, images []*Image) ([]DiskUsageStat, error) {
stats := make([]DiskUsageStat, len(images))
// Build a layerTree to quickly compute (and cache!) parent/child
// relations.
tree, err := ir.layerTree()
if err != nil {
return nil, err
}
// Calculate the stats for each image.
for i, img := range images {
stat, err := diskUsageForImage(ctx, img, tree)
if err != nil {
return nil, err
}
stats[i] = *stat
}
return stats, nil
}
// diskUsageForImage returns the disk-usage statistics for the spcified image.
func diskUsageForImage(ctx context.Context, image *Image, tree *layerTree) (*DiskUsageStat, error) {
stat := DiskUsageStat{
ID: image.ID(),
Created: image.Created(),
}
// Repository and tag.
var name, repository, tag string
for _, n := range image.Names() {
if len(n) > 0 {
name = n
break
}
}
if len(name) > 0 {
named, err := reference.ParseNormalizedNamed(name)
if err != nil {
return nil, err
}
repository = named.Name()
if tagged, isTagged := named.(reference.NamedTagged); isTagged {
tag = tagged.Tag()
}
} else {
repository = "<none>"
tag = "<none>"
}
stat.Repository = repository
stat.Tag = tag
// Shared, unique and total size.
parent, err := tree.parent(ctx, image)
if err != nil {
return nil, err
}
childIDs, err := tree.children(ctx, image, false)
if err != nil {
return nil, err
}
// Optimistically set unique size to the full size of the image.
size, err := image.Size(ctx)
if err != nil {
return nil, err
}
stat.UniqueSize = *size
if len(childIDs) > 0 {
// If we have children, we share everything.
stat.SharedSize = stat.UniqueSize
stat.UniqueSize = 0
} else if parent != nil {
// If we have no children but a parent, remove the parent
// (shared) size from the unique one.
size, err := parent.Size(ctx)
if err != nil {
return nil, err
}
stat.UniqueSize -= *size
stat.SharedSize = *size
}
stat.Size = stat.SharedSize + stat.UniqueSize
// Number of containers using the image.
containers, err := image.Containers()
if err != nil {
return nil, err
}
stat.Containers = len(containers)
return &stat, nil
}
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