294 lines
8.9 KiB
Go
294 lines
8.9 KiB
Go
package image
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import (
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"fmt"
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"strings"
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"time"
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is "github.com/containers/image/storage"
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"github.com/containers/image/transports"
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"github.com/containers/image/types"
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"github.com/containers/storage"
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"github.com/kubernetes-incubator/cri-o/libkpod/common"
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digest "github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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)
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// FilterParams contains the filter options that may be given when outputting images
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type FilterParams struct {
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dangling string
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label string
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beforeImage time.Time
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sinceImage time.Time
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referencePattern string
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}
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// ParseFilter takes a set of images and a filter string as input, and returns the
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func ParseFilter(store storage.Store, filter string) (*FilterParams, error) {
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images, err := store.Images()
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if err != nil {
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return nil, err
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}
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params := new(FilterParams)
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filterStrings := strings.Split(filter, ",")
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for _, param := range filterStrings {
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pair := strings.SplitN(param, "=", 2)
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switch strings.TrimSpace(pair[0]) {
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case "dangling":
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if common.IsValidBool(pair[1]) {
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params.dangling = pair[1]
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} else {
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return nil, fmt.Errorf("invalid filter: '%s=[%s]'", pair[0], pair[1])
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}
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case "label":
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params.label = pair[1]
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case "before":
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if img, err := findImageInSlice(images, pair[1]); err == nil {
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info, err := getImageInspectInfo(store, img)
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if err != nil {
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return nil, err
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}
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params.beforeImage = info.Created
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} else {
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return nil, fmt.Errorf("no such id: %s", pair[0])
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}
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case "since":
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if img, err := findImageInSlice(images, pair[1]); err == nil {
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info, err := getImageInspectInfo(store, img)
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if err != nil {
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return nil, err
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}
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params.sinceImage = info.Created
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} else {
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return nil, fmt.Errorf("no such id: %s``", pair[0])
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}
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case "reference":
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params.referencePattern = pair[1]
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default:
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return nil, fmt.Errorf("invalid filter: '%s'", pair[0])
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}
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}
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return params, nil
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}
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func matchesFilter(store storage.Store, image storage.Image, name string, params *FilterParams) bool {
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if params == nil {
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return true
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}
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info, err := getImageInspectInfo(store, image)
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if err != nil {
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return false
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}
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if params.dangling != "" && !matchesDangling(name, params.dangling) {
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return false
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} else if params.label != "" && !matchesLabel(info, store, params.label) {
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return false
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} else if !params.beforeImage.IsZero() && !matchesBeforeImage(info, name, params) {
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return false
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} else if !params.sinceImage.IsZero() && !matchesSinceImage(info, name, params) {
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return false
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} else if params.referencePattern != "" && !MatchesReference(name, params.referencePattern) {
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return false
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}
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return true
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}
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func matchesDangling(name string, dangling string) bool {
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if common.IsFalse(dangling) && name != "<none>" {
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return true
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} else if common.IsTrue(dangling) && name == "<none>" {
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return true
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}
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return false
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}
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func matchesLabel(info *types.ImageInspectInfo, store storage.Store, label string) bool {
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pair := strings.SplitN(label, "=", 2)
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for key, value := range info.Labels {
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if key == pair[0] {
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if len(pair) == 2 {
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if value == pair[1] {
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return true
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}
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} else {
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return false
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}
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}
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}
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return false
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}
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// Returns true if the image was created since the filter image. Returns
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// false otherwise
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func matchesBeforeImage(info *types.ImageInspectInfo, name string, params *FilterParams) bool {
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if info.Created.Before(params.beforeImage) {
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return true
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}
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return false
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}
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// Returns true if the image was created since the filter image. Returns
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// false otherwise
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func matchesSinceImage(info *types.ImageInspectInfo, name string, params *FilterParams) bool {
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if info.Created.After(params.sinceImage) {
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return true
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}
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return false
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}
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// MatchesID returns true if argID is a full or partial match for id
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func MatchesID(id, argID string) bool {
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return strings.HasPrefix(argID, id)
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}
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// MatchesReference returns true if argName is a full or partial match for name
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// Partial matches will register only if they match the most specific part of the name available
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// For example, take the image docker.io/library/redis:latest
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// redis, library,redis, docker.io/library/redis, redis:latest, etc. will match
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// But redis:alpine, ry/redis, library, and io/library/redis will not
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func MatchesReference(name, argName string) bool {
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if argName == "" {
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return false
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}
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splitName := strings.Split(name, ":")
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// If the arg contains a tag, we handle it differently than if it does not
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if strings.Contains(argName, ":") {
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splitArg := strings.Split(argName, ":")
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return strings.HasSuffix(splitName[0], splitArg[0]) && (splitName[1] == splitArg[1])
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}
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return strings.HasSuffix(splitName[0], argName)
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}
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// FormattedSize returns a human-readable formatted size for the image
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func FormattedSize(size float64) string {
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suffixes := [5]string{"B", "KB", "MB", "GB", "TB"}
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count := 0
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for size >= 1024 && count < 4 {
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size /= 1024
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count++
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}
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return fmt.Sprintf("%.4g %s", size, suffixes[count])
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}
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// FindImage searches for a *storage.Image with a matching the given name or ID in the given store.
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func FindImage(store storage.Store, image string) (*storage.Image, error) {
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var img *storage.Image
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ref, err := is.Transport.ParseStoreReference(store, image)
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if err == nil {
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img, err = is.Transport.GetStoreImage(store, ref)
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}
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if err != nil {
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img2, err2 := store.Image(image)
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if err2 != nil {
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if ref == nil {
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return nil, errors.Wrapf(err, "error parsing reference to image %q", image)
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}
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return nil, errors.Wrapf(err, "unable to locate image %q", image)
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}
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img = img2
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}
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return img, nil
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}
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// FindImageRef searches for and returns a new types.Image matching the given name or ID in the given store.
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func FindImageRef(store storage.Store, image string) (types.Image, error) {
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img, err := FindImage(store, image)
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if err != nil {
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return nil, errors.Wrapf(err, "unable to locate image %q", image)
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}
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ref, err := is.Transport.ParseStoreReference(store, "@"+img.ID)
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if err != nil {
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return nil, errors.Wrapf(err, "error parsing reference to image %q", img.ID)
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}
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imgRef, err := ref.NewImage(nil)
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if err != nil {
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return nil, errors.Wrapf(err, "error reading image %q", img.ID)
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}
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return imgRef, nil
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}
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func findImageInSlice(images []storage.Image, ref string) (storage.Image, error) {
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for _, image := range images {
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if MatchesID(image.ID, ref) {
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return image, nil
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}
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for _, name := range image.Names {
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if MatchesReference(name, ref) {
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return image, nil
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}
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}
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}
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return storage.Image{}, errors.New("could not find image")
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}
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// InfoAndDigestAndSize returns the inspection info and size of the image in the given
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// store and the digest of its manifest, if it has one, or "" if it doesn't.
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func InfoAndDigestAndSize(store storage.Store, img storage.Image) (*types.ImageInspectInfo, digest.Digest, int64, error) {
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imgRef, err := FindImageRef(store, "@"+img.ID)
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if err != nil {
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return nil, "", -1, errors.Wrapf(err, "error reading image %q", img.ID)
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}
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defer imgRef.Close()
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return infoAndDigestAndSize(imgRef)
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}
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func infoAndDigestAndSize(imgRef types.Image) (*types.ImageInspectInfo, digest.Digest, int64, error) {
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imgSize, err := imgRef.Size()
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if err != nil {
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return nil, "", -1, errors.Wrapf(err, "error reading size of image %q", transports.ImageName(imgRef.Reference()))
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}
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manifest, _, err := imgRef.Manifest()
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if err != nil {
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return nil, "", -1, errors.Wrapf(err, "error reading manifest for image %q", transports.ImageName(imgRef.Reference()))
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}
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manifestDigest := digest.Digest("")
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if len(manifest) > 0 {
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manifestDigest = digest.Canonical.FromBytes(manifest)
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}
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info, err := imgRef.Inspect()
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if err != nil {
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return nil, "", -1, errors.Wrapf(err, "error inspecting image %q", transports.ImageName(imgRef.Reference()))
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}
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return info, manifestDigest, imgSize, nil
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}
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// GetImagesMatchingFilter returns a slice of all images in the store that match the provided FilterParams.
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// Images with more than one name matching the filter will be in the slice once for each name
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func GetImagesMatchingFilter(store storage.Store, filter *FilterParams, argName string) ([]storage.Image, error) {
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images, err := store.Images()
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filteredImages := []storage.Image{}
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if err != nil {
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return nil, err
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}
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for _, image := range images {
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names := []string{}
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if len(image.Names) > 0 {
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names = image.Names
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} else {
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names = append(names, "<none>")
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}
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for _, name := range names {
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if (filter == nil && argName == "") || (filter != nil && matchesFilter(store, image, name, filter)) || MatchesReference(name, argName) {
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newImage := image
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newImage.Names = []string{name}
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filteredImages = append(filteredImages, newImage)
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}
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}
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}
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return filteredImages, nil
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}
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func getImageInspectInfo(store storage.Store, image storage.Image) (*types.ImageInspectInfo, error) {
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storeRef, err := is.Transport.ParseStoreReference(store, "@"+image.ID)
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if err != nil {
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return nil, err
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}
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img, err := storeRef.NewImage(nil)
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if err != nil {
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return nil, err
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}
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defer img.Close()
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return img.Inspect()
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}
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