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package image
import (
"context"
"strconv"
"strings"
"github.com/containers/podman/v3/libpod/events"
"github.com/containers/podman/v3/pkg/domain/entities/reports"
"github.com/containers/podman/v3/pkg/util"
"github.com/containers/storage"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func generatePruneFilterFuncs(filter, filterValue string) (ImageFilter, error) {
switch filter {
case "label":
return func(i *Image) bool {
labels, err := i.Labels(context.Background())
if err != nil {
return false
}
return util.MatchLabelFilters([]string{filterValue}, labels)
}, nil
case "until":
until, err := util.ComputeUntilTimestamp([]string{filterValue})
if err != nil {
return nil, err
}
return func(i *Image) bool {
if !until.IsZero() && i.Created().After((until)) {
return true
}
return false
}, nil
case "dangling":
danglingImages, err := strconv.ParseBool(filterValue)
if err != nil {
return nil, errors.Wrapf(err, "invalid filter dangling=%s", filterValue)
}
return ImageFilter(DanglingFilter(danglingImages)), nil
}
return nil, nil
}
// GetPruneImages returns a slice of images that have no names/unused
func (ir *Runtime) GetPruneImages(ctx context.Context, all bool, filterFuncs []ImageFilter) ([]*Image, error) {
var (
pruneImages []*Image
)
allImages, err := ir.GetRWImages()
if err != nil {
return nil, err
}
tree, err := ir.layerTree()
if err != nil {
return nil, err
}
for _, i := range allImages {
// filter the images based on this.
for _, filterFunc := range filterFuncs {
if !filterFunc(i) {
continue
}
}
if all {
containers, err := i.Containers()
if err != nil {
return nil, err
}
if len(containers) < 1 {
pruneImages = append(pruneImages, i)
continue
}
}
// skip the cache (i.e., with parent) and intermediate (i.e.,
// with children) images
intermediate, err := tree.hasChildrenAndParent(ctx, i)
if err != nil {
return nil, err
}
if intermediate {
continue
}
if i.Dangling() {
pruneImages = append(pruneImages, i)
}
}
return pruneImages, nil
}
// PruneImages prunes dangling and optionally all unused images from the local
// image store
func (ir *Runtime) PruneImages(ctx context.Context, all bool, filter []string) ([]*reports.PruneReport, error) {
preports := make([]*reports.PruneReport, 0)
filterFuncs := make([]ImageFilter, 0, len(filter))
for _, f := range filter {
filterSplit := strings.SplitN(f, "=", 2)
if len(filterSplit) < 2 {
return nil, errors.Errorf("filter input must be in the form of filter=value: %s is invalid", f)
}
generatedFunc, err := generatePruneFilterFuncs(filterSplit[0], filterSplit[1])
if err != nil {
return nil, errors.Wrapf(err, "invalid filter")
}
filterFuncs = append(filterFuncs, generatedFunc)
}
prev := 0
for {
toPrune, err := ir.GetPruneImages(ctx, all, filterFuncs)
if err != nil {
return nil, errors.Wrap(err, "unable to get images to prune")
}
numImages := len(toPrune)
if numImages == 0 || numImages == prev {
// If there's nothing left to do, return.
break
}
prev = numImages
for _, img := range toPrune {
repotags, err := img.RepoTags()
if err != nil {
return nil, err
}
nameOrID := img.ID()
s, err := img.Size(ctx)
imgSize := *s
if err != nil {
logrus.Warnf("Failed to collect image size for: %s, %s", nameOrID, err)
imgSize = 0
}
if err := img.Remove(ctx, false); err != nil {
if errors.Cause(err) == storage.ErrImageUsedByContainer {
logrus.Warnf("Failed to prune image %s as it is in use: %v.\nA container associated with containers/storage (e.g., Buildah, CRI-O, etc.) maybe associated with this image.\nUsing the rmi command with the --force option will remove the container and image, but may cause failures for other dependent systems.", img.ID(), err)
continue
}
return nil, errors.Wrap(err, "failed to prune image")
}
defer img.newImageEvent(events.Prune)
if len(repotags) > 0 {
nameOrID = repotags[0]
}
preports = append(preports, &reports.PruneReport{
Id: nameOrID,
Err: nil,
Size: uint64(imgSize),
})
}
}
return preports, nil
}
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