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package libpod
import (
"context"
"io"
"io/ioutil"
"os"
buildahDefine "github.com/containers/buildah/define"
"github.com/containers/buildah/imagebuildah"
"github.com/containers/common/libimage"
"github.com/containers/image/v5/docker/reference"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/libpod/events"
"github.com/containers/podman/v3/pkg/util"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// Runtime API
// RemoveContainersForImageCallback returns a callback that can be used in
// `libimage`. When forcefully removing images, containers using the image
// should be removed as well. The callback allows for more graceful removal as
// we can use the libpod-internal removal logic.
func (r *Runtime) RemoveContainersForImageCallback(ctx context.Context) libimage.RemoveContainerFunc {
return func(imageID string) error {
r.lock.Lock()
defer r.lock.Unlock()
if !r.valid {
return define.ErrRuntimeStopped
}
ctrs, err := r.state.AllContainers()
if err != nil {
return err
}
for _, ctr := range ctrs {
if ctr.config.RootfsImageID == imageID {
var timeout *uint
if err := r.removeContainer(ctx, ctr, true, false, false, timeout); err != nil {
return errors.Wrapf(err, "error removing image %s: container %s using image could not be removed", imageID, ctr.ID())
}
}
}
// Note that `libimage` will take care of removing any leftover
// containers from the storage.
return nil
}
}
// IsExternalContainerCallback returns a callback that be used in `libimage` to
// figure out whether a given container is an external one. A container is
// considered external if it is not present in libpod's database.
func (r *Runtime) IsExternalContainerCallback(_ context.Context) libimage.IsExternalContainerFunc {
// NOTE: pruning external containers is subject to race conditions
// (e.g., when a container gets removed). To address this and similar
// races, pruning had to happen inside c/storage. Containers has to be
// labelled with "podman/libpod" along with callbacks similar to
// libimage.
return func(idOrName string) (bool, error) {
_, err := r.LookupContainer(idOrName)
if err == nil {
return false, nil
}
if errors.Is(err, define.ErrNoSuchCtr) {
return true, nil
}
return false, nil
}
}
// newBuildEvent creates a new event based on completion of a built image
func (r *Runtime) newImageBuildCompleteEvent(idOrName string) {
e := events.NewEvent(events.Build)
e.Type = events.Image
e.Name = idOrName
if err := r.eventer.Write(e); err != nil {
logrus.Errorf("Unable to write build event: %q", err)
}
}
// Build adds the runtime to the imagebuildah call
func (r *Runtime) Build(ctx context.Context, options buildahDefine.BuildOptions, dockerfiles ...string) (string, reference.Canonical, error) {
if options.Runtime == "" {
options.Runtime = r.GetOCIRuntimePath()
}
id, ref, err := imagebuildah.BuildDockerfiles(ctx, r.store, options, dockerfiles...)
// Write event for build completion
r.newImageBuildCompleteEvent(id)
return id, ref, err
}
// DownloadFromFile reads all of the content from the reader and temporarily
// saves in it $TMPDIR/importxyz, which is deleted after the image is imported
func DownloadFromFile(reader *os.File) (string, error) {
outFile, err := ioutil.TempFile(util.Tmpdir(), "import")
if err != nil {
return "", errors.Wrap(err, "error creating file")
}
defer outFile.Close()
logrus.Debugf("saving %s to %s", reader.Name(), outFile.Name())
_, err = io.Copy(outFile, reader)
if err != nil {
return "", errors.Wrapf(err, "error saving %s to %s", reader.Name(), outFile.Name())
}
return outFile.Name(), nil
}
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