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