127 lines
3.3 KiB
Go
127 lines
3.3 KiB
Go
package images // import "github.com/docker/docker/daemon/images"
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import (
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"context"
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"encoding/json"
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"io"
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"github.com/docker/docker/api/types/backend"
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"github.com/docker/docker/image"
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"github.com/docker/docker/layer"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/pkg/errors"
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)
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// CommitImage creates a new image from a commit config
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func (i *ImageService) CommitImage(ctx context.Context, c backend.CommitConfig) (image.ID, error) {
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if err := ctx.Err(); err != nil {
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return "", err
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}
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rwTar, err := exportContainerRw(i.layerStore, c.ContainerID, c.ContainerMountLabel)
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if err != nil {
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return "", err
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}
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defer func() {
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if rwTar != nil {
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rwTar.Close()
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}
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}()
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var parent *image.Image
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if c.ParentImageID == "" {
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parent = new(image.Image)
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parent.RootFS = image.NewRootFS()
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} else {
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parent, err = i.imageStore.Get(image.ID(c.ParentImageID))
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if err != nil {
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return "", err
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}
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}
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l, err := i.layerStore.Register(rwTar, parent.RootFS.ChainID())
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if err != nil {
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return "", err
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}
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defer layer.ReleaseAndLog(i.layerStore, l)
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cc := image.ChildConfig{
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ContainerID: c.ContainerID,
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Author: c.Author,
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Comment: c.Comment,
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ContainerConfig: c.ContainerConfig,
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Config: c.Config,
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DiffID: l.DiffID(),
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}
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config, err := json.Marshal(image.NewChildImage(parent, cc, c.ContainerOS))
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if err != nil {
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return "", err
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}
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id, err := i.imageStore.Create(config)
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if err != nil {
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return "", err
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}
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if c.ParentImageID != "" {
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if err := i.imageStore.SetParent(id, image.ID(c.ParentImageID)); err != nil {
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return "", err
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}
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}
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return id, nil
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}
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func exportContainerRw(layerStore layer.Store, id, mountLabel string) (arch io.ReadCloser, err error) {
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rwlayer, err := layerStore.GetRWLayer(id)
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if err != nil {
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return nil, err
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}
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defer func() {
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if err != nil {
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layerStore.ReleaseRWLayer(rwlayer)
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}
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}()
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// TODO: this mount call is not necessary as we assume that TarStream() should
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// mount the layer if needed. But the Diff() function for windows requests that
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// the layer should be mounted when calling it. So we reserve this mount call
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// until windows driver can implement Diff() interface correctly.
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_, err = rwlayer.Mount(mountLabel)
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if err != nil {
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return nil, err
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}
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archive, err := rwlayer.TarStream()
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if err != nil {
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rwlayer.Unmount()
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return nil, err
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}
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return ioutils.NewReadCloserWrapper(archive, func() error {
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archive.Close()
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err = rwlayer.Unmount()
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layerStore.ReleaseRWLayer(rwlayer)
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return err
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}),
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nil
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}
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// CommitBuildStep is used by the builder to create an image for each step in
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// the build.
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//
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// This method is different from CreateImageFromContainer:
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// - it doesn't attempt to validate container state
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// - it doesn't send a commit action to metrics
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// - it doesn't log a container commit event
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//
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// This is a temporary shim. Should be removed when builder stops using commit.
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func (i *ImageService) CommitBuildStep(ctx context.Context, c backend.CommitConfig) (image.ID, error) {
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ctr := i.containers.Get(c.ContainerID)
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if ctr == nil {
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// TODO: use typed error
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return "", errors.Errorf("container not found: %s", c.ContainerID)
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}
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c.ContainerMountLabel = ctr.MountLabel
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c.ContainerOS = ctr.OS
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c.ParentImageID = string(ctr.ImageID)
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return i.CommitImage(ctx, c)
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}
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