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package libpod
import (
"context"
"fmt"
"github.com/opencontainers/image-spec/specs-go/v1"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"github.com/containers/buildah/imagebuildah"
"github.com/containers/libpod/libpod/image"
"github.com/containers/libpod/pkg/util"
"github.com/containers/storage"
"github.com/pkg/errors"
)
// Runtime API
// RemoveImage deletes an image from local storage
// Images being used by running containers can only be removed if force=true
func (r *Runtime) RemoveImage(ctx context.Context, img *image.Image, force bool) (string, error) {
r.lock.Lock()
defer r.lock.Unlock()
if !r.valid {
return "", ErrRuntimeStopped
}
// Get all containers, filter to only those using the image, and remove those containers
ctrs, err := r.state.AllContainers()
if err != nil {
return "", err
}
imageCtrs := []*Container{}
for _, ctr := range ctrs {
if ctr.config.RootfsImageID == img.ID() {
imageCtrs = append(imageCtrs, ctr)
}
}
if len(imageCtrs) > 0 && len(img.Names()) <= 1 {
if force {
for _, ctr := range imageCtrs {
if err := r.removeContainer(ctx, ctr, true); err != nil {
return "", errors.Wrapf(err, "error removing image %s: container %s using image could not be removed", img.ID(), ctr.ID())
}
}
} else {
return "", fmt.Errorf("could not remove image %s as it is being used by %d containers", img.ID(), len(imageCtrs))
}
}
hasChildren, err := img.IsParent()
if err != nil {
return "", err
}
if (len(img.Names()) > 1 && !img.InputIsID()) || hasChildren {
// If the image has multiple reponames, we do not technically delete
// the image. we figure out which repotag the user is trying to refer
// to and untag it.
repoName, err := img.MatchRepoTag(img.InputName)
if hasChildren && err == image.ErrRepoTagNotFound {
return "", errors.Errorf("unable to delete %q (cannot be forced) - image has dependent child images", img.ID())
}
if err != nil {
return "", err
}
if err := img.UntagImage(repoName); err != nil {
return "", err
}
return fmt.Sprintf("Untagged: %s", repoName), nil
} else if len(img.Names()) > 1 && img.InputIsID() && !force {
// If the user requests to delete an image by ID and the image has multiple
// reponames and no force is applied, we error out.
return "", fmt.Errorf("unable to delete %s (must force) - image is referred to in multiple tags", img.ID())
}
err = img.Remove(force)
if err != nil && errors.Cause(err) == storage.ErrImageUsedByContainer {
if errStorage := r.rmStorageContainers(force, img); errStorage == nil {
// Containers associated with the image should be deleted now,
// let's try removing the image again.
err = img.Remove(force)
} else {
err = errStorage
}
}
return img.ID(), err
}
// Remove containers that are in storage rather than Podman.
func (r *Runtime) rmStorageContainers(force bool, image *image.Image) error {
ctrIDs, err := storageContainers(image.ID(), r.store)
if err != nil {
return errors.Wrapf(err, "error getting containers for image %q", image.ID())
}
if len(ctrIDs) > 0 && !force {
return storage.ErrImageUsedByContainer
}
if len(ctrIDs) > 0 && force {
if err = removeStorageContainers(ctrIDs, r.store); err != nil {
return errors.Wrapf(err, "error removing containers %v for image %q", ctrIDs, image.ID())
}
}
return nil
}
// Returns a list of storage containers associated with the given ImageReference
func storageContainers(imageID string, store storage.Store) ([]string, error) {
ctrIDs := []string{}
containers, err := store.Containers()
if err != nil {
return nil, err
}
for _, ctr := range containers {
if ctr.ImageID == imageID {
ctrIDs = append(ctrIDs, ctr.ID)
}
}
return ctrIDs, nil
}
// Removes the containers passed in the array.
func removeStorageContainers(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
}
// Build adds the runtime to the imagebuildah call
func (r *Runtime) Build(ctx context.Context, options imagebuildah.BuildOptions, dockerfiles ...string) error {
_, _, err := imagebuildah.BuildDockerfiles(ctx, r.store, options, dockerfiles...)
return err
}
// Import is called as an intermediary to the image library Import
func (r *Runtime) Import(ctx context.Context, source string, reference string, changes []string, history string, quiet bool) (string, error) {
var (
writer io.Writer
err error
)
ic := v1.ImageConfig{}
if len(changes) > 0 {
ic, err = util.GetImageConfig(changes)
if err != nil {
return "", errors.Wrapf(err, "error adding config changes to image %q", source)
}
}
hist := []v1.History{
{Comment: history},
}
config := v1.Image{
Config: ic,
History: hist,
}
writer = nil
if !quiet {
writer = os.Stderr
}
// if source is a url, download it and save to a temp file
u, err := url.ParseRequestURI(source)
if err == nil && u.Scheme != "" {
file, err := downloadFromURL(source)
if err != nil {
return "", err
}
defer os.Remove(file)
source = file
}
newImage, err := r.imageRuntime.Import(ctx, source, reference, writer, image.SigningOptions{}, config)
if err != nil {
return "", err
}
return newImage.ID(), nil
}
// donwloadFromURL downloads an image in the format "https:/example.com/myimage.tar"
// and temporarily saves in it /var/tmp/importxyz, which is deleted after the image is imported
func downloadFromURL(source string) (string, error) {
fmt.Printf("Downloading from %q\n", source)
outFile, err := ioutil.TempFile("/var/tmp", "import")
if err != nil {
return "", errors.Wrap(err, "error creating file")
}
defer outFile.Close()
response, err := http.Get(source)
if err != nil {
return "", errors.Wrapf(err, "error downloading %q", source)
}
defer response.Body.Close()
_, err = io.Copy(outFile, response.Body)
if err != nil {
return "", errors.Wrapf(err, "error saving %s to %s", source, outFile.Name())
}
return outFile.Name(), nil
}
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