forked from containers/buildah
/
rmi.go
315 lines (288 loc) · 8.56 KB
/
rmi.go
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package main
import (
"fmt"
"os"
is "github.com/containers/image/storage"
"github.com/containers/image/transports"
"github.com/containers/image/transports/alltransports"
"github.com/containers/image/types"
"github.com/containers/storage"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
var (
rmiDescription = "removes one or more locally stored images."
rmiFlags = []cli.Flag{
cli.BoolFlag{
Name: "all, a",
Usage: "remove all images",
},
cli.BoolFlag{
Name: "prune, p",
Usage: "prune dangling images",
},
cli.BoolFlag{
Name: "force, f",
Usage: "force removal of the image and any containers using the image",
},
}
rmiCommand = cli.Command{
Name: "rmi",
Usage: "removes one or more images from local storage",
Description: rmiDescription,
Action: rmiCmd,
ArgsUsage: "IMAGE-NAME-OR-ID [...]",
Flags: rmiFlags,
}
)
func rmiCmd(c *cli.Context) error {
force := c.Bool("force")
removeAll := c.Bool("all")
pruneDangling := c.Bool("prune")
args := c.Args()
if len(args) == 0 && !removeAll && !pruneDangling {
return errors.Errorf("image name or ID must be specified")
}
if len(args) > 0 && removeAll {
return errors.Errorf("when using the --all switch, you may not pass any images names or IDs")
}
if removeAll && pruneDangling {
return errors.Errorf("when using the --all switch, you may not use --prune switch")
}
if err := validateFlags(c, rmiFlags); err != nil {
return err
}
store, err := getStore(c)
if err != nil {
return err
}
imagesToDelete := args[:]
var lastError error
if removeAll {
imagesToDelete, err = findAllImages(store)
if err != nil {
return err
}
}
if pruneDangling {
imagesToDelete, err = findDanglingImages(store)
if err != nil {
return err
}
}
for _, id := range imagesToDelete {
image, err := getImage(id, store)
if err != nil || image == nil {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
if err == nil {
err = storage.ErrNotAnImage
}
lastError = errors.Wrapf(err, "could not get image %q", id)
continue
}
if image != nil {
ctrIDs, err := runningContainers(image, store)
if err != nil {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
lastError = errors.Wrapf(err, "error getting running containers for image %q", id)
continue
}
if len(ctrIDs) > 0 && len(image.Names) <= 1 {
if force {
err = removeContainers(ctrIDs, store)
if err != nil {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
lastError = errors.Wrapf(err, "error removing containers %v for image %q", ctrIDs, id)
continue
}
} else {
for _, ctrID := range ctrIDs {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
lastError = errors.Wrapf(storage.ErrImageUsedByContainer, "Could not remove image %q (must force) - container %q is using its reference image", id, ctrID)
}
continue
}
}
// If the user supplied an ID, we cannot delete the image if it is referred to by multiple tags
if matchesID(image.ID, id) {
if len(image.Names) > 1 && !force {
return fmt.Errorf("unable to delete %s (must force) - image is referred to in multiple tags", image.ID)
}
// If it is forced, we have to untag the image so that it can be deleted
image.Names = image.Names[:0]
} else {
name, err2 := untagImage(id, image, store)
if err2 != nil {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
lastError = errors.Wrapf(err2, "error removing tag %q from image %q", id, image.ID)
continue
}
fmt.Printf("untagged: %s\n", name)
}
if len(image.Names) > 0 {
continue
}
id, err := removeImage(image, store)
if err != nil {
if lastError != nil {
fmt.Fprintln(os.Stderr, lastError)
}
lastError = errors.Wrapf(err, "error removing image %q", image.ID)
continue
}
fmt.Printf("%s\n", id)
}
}
return lastError
}
func getImage(id string, store storage.Store) (*storage.Image, error) {
var ref types.ImageReference
ref, err := properImageRef(id)
if err != nil {
logrus.Debug(err)
}
if ref == nil {
if ref, err = storageImageRef(store, id); err != nil {
logrus.Debug(err)
}
}
if ref == nil {
if ref, err = storageImageID(store, id); err != nil {
logrus.Debug(err)
}
}
if ref != nil {
image, err2 := is.Transport.GetStoreImage(store, ref)
if err2 != nil {
return nil, errors.Wrapf(err2, "error reading image using reference %q", transports.ImageName(ref))
}
return image, nil
}
return nil, err
}
func untagImage(imgArg string, image *storage.Image, store storage.Store) (string, error) {
newNames := []string{}
removedName := ""
for _, name := range image.Names {
if matchesReference(name, imgArg) {
removedName = name
continue
}
newNames = append(newNames, name)
}
if removedName != "" {
if err := store.SetNames(image.ID, newNames); err != nil {
return "", errors.Wrapf(err, "error removing name %q from image %q", removedName, image.ID)
}
}
return removedName, nil
}
func removeImage(image *storage.Image, store storage.Store) (string, error) {
if _, err := store.DeleteImage(image.ID, true); err != nil {
return "", errors.Wrapf(err, "could not remove image %q", image.ID)
}
return image.ID, nil
}
// Returns a list of running containers associated with the given ImageReference
func runningContainers(image *storage.Image, store storage.Store) ([]string, error) {
ctrIDs := []string{}
containers, err := store.Containers()
if err != nil {
return nil, err
}
for _, ctr := range containers {
if ctr.ImageID == image.ID {
ctrIDs = append(ctrIDs, ctr.ID)
}
}
return ctrIDs, nil
}
func removeContainers(ctrIDs []string, store storage.Store) error {
for _, ctrID := range ctrIDs {
if err := store.DeleteContainer(ctrID); err != nil {
return errors.Wrapf(err, "could not remove container %q", ctrID)
}
}
return nil
}
// If it's looks like a proper image reference, parse it and check if it
// corresponds to an image that actually exists.
func properImageRef(id string) (types.ImageReference, error) {
var err error
if ref, err := alltransports.ParseImageName(id); err == nil {
if img, err2 := ref.NewImageSource(nil); err2 == nil {
img.Close()
return ref, nil
}
return nil, errors.Wrapf(err, "error confirming presence of image reference %q", transports.ImageName(ref))
}
return nil, errors.Wrapf(err, "error parsing %q as an image reference", id)
}
// If it's looks like an image reference that's relative to our storage, parse
// it and check if it corresponds to an image that actually exists.
func storageImageRef(store storage.Store, id string) (types.ImageReference, error) {
var err error
if ref, err := is.Transport.ParseStoreReference(store, id); err == nil {
if img, err2 := ref.NewImageSource(nil); err2 == nil {
img.Close()
return ref, nil
}
return nil, errors.Wrapf(err, "error confirming presence of storage image reference %q", transports.ImageName(ref))
}
return nil, errors.Wrapf(err, "error parsing %q as a storage image reference", id)
}
// If it might be an ID that's relative to our storage, truncated or not, so
// parse it and check if it corresponds to an image that we have stored
// locally.
func storageImageID(store storage.Store, id string) (types.ImageReference, error) {
var err error
imageID := id
if img, err := store.Image(id); err == nil && img != nil {
imageID = img.ID
}
if ref, err := is.Transport.ParseStoreReference(store, imageID); err == nil {
if img, err2 := ref.NewImageSource(nil); err2 == nil {
img.Close()
return ref, nil
}
return nil, errors.Wrapf(err, "error confirming presence of storage image reference %q", transports.ImageName(ref))
}
return nil, errors.Wrapf(err, "error parsing %q as a storage image reference: %v", id)
}
// Returns a list of all existing images
func findAllImages(store storage.Store) ([]string, error) {
imagesToDelete := []string{}
images, err := store.Images()
if err != nil {
return nil, errors.Wrapf(err, "error reading images")
}
for _, image := range images {
imagesToDelete = append(imagesToDelete, image.ID)
}
return imagesToDelete, nil
}
// Returns a list of all dangling images
func findDanglingImages(store storage.Store) ([]string, error) {
imagesToDelete := []string{}
images, err := store.Images()
if err != nil {
return nil, errors.Wrapf(err, "error reading images")
}
for _, image := range images {
if len(image.Names) == 0 {
imagesToDelete = append(imagesToDelete, image.ID)
}
}
return imagesToDelete, nil
}