6c28e8edd5
buildStages now tracks the imageID and runConfig for a build stage imageMounter tracks image mounts so they can released when the build ends. Signed-off-by: Daniel Nephin <dnephin@docker.com>
122 lines
3.6 KiB
Go
122 lines
3.6 KiB
Go
package daemon
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import (
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"github.com/Sirupsen/logrus"
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"github.com/docker/distribution/reference"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/backend"
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"github.com/docker/docker/builder"
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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/stringid"
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"github.com/docker/docker/registry"
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"github.com/pkg/errors"
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"golang.org/x/net/context"
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"io"
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)
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type releaseableLayer struct {
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layerStore layer.Store
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roLayer layer.Layer
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rwLayer layer.RWLayer
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}
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func (rl *releaseableLayer) Mount() (string, error) {
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if rl.roLayer == nil {
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return "", errors.New("can not mount an image with no root FS")
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}
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var err error
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mountID := stringid.GenerateRandomID()
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rl.rwLayer, err = rl.layerStore.CreateRWLayer(mountID, rl.roLayer.ChainID(), nil)
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if err != nil {
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return "", errors.Wrap(err, "failed to create rwlayer")
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}
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return rl.rwLayer.Mount("")
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}
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func (rl *releaseableLayer) Release() error {
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rl.releaseRWLayer()
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return rl.releaseROLayer()
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}
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func (rl *releaseableLayer) releaseRWLayer() error {
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if rl.rwLayer == nil {
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return nil
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}
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metadata, err := rl.layerStore.ReleaseRWLayer(rl.rwLayer)
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layer.LogReleaseMetadata(metadata)
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if err != nil {
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logrus.Errorf("Failed to release RWLayer: %s", err)
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}
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return err
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}
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func (rl *releaseableLayer) releaseROLayer() error {
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if rl.roLayer == nil {
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return nil
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}
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metadata, err := rl.layerStore.Release(rl.roLayer)
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layer.LogReleaseMetadata(metadata)
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return err
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}
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func newReleasableLayerForImage(img *image.Image, layerStore layer.Store) (builder.ReleaseableLayer, error) {
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if img.RootFS.ChainID() == "" {
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return nil, nil
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}
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// Hold a reference to the image layer so that it can't be removed before
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// it is released
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roLayer, err := layerStore.Get(img.RootFS.ChainID())
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if err != nil {
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return nil, errors.Wrapf(err, "failed to get layer for image %s", img.ImageID())
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}
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return &releaseableLayer{layerStore: layerStore, roLayer: roLayer}, nil
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}
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// TODO: could this use the regular daemon PullImage ?
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func (daemon *Daemon) pullForBuilder(ctx context.Context, name string, authConfigs map[string]types.AuthConfig, output io.Writer) (*image.Image, error) {
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ref, err := reference.ParseNormalizedNamed(name)
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if err != nil {
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return nil, err
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}
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ref = reference.TagNameOnly(ref)
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pullRegistryAuth := &types.AuthConfig{}
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if len(authConfigs) > 0 {
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// The request came with a full auth config, use it
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repoInfo, err := daemon.RegistryService.ResolveRepository(ref)
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if err != nil {
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return nil, err
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}
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resolvedConfig := registry.ResolveAuthConfig(authConfigs, repoInfo.Index)
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pullRegistryAuth = &resolvedConfig
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}
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if err := daemon.pullImageWithReference(ctx, ref, nil, pullRegistryAuth, output); err != nil {
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return nil, err
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}
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return daemon.GetImage(name)
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}
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// GetImageAndReleasableLayer returns an image and releaseable layer for a reference or ID.
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// Every call to GetImageAndReleasableLayer MUST call releasableLayer.Release() to prevent
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// leaking of layers.
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func (daemon *Daemon) GetImageAndReleasableLayer(ctx context.Context, refOrID string, opts backend.GetImageAndLayerOptions) (builder.Image, builder.ReleaseableLayer, error) {
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if !opts.ForcePull {
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image, _ := daemon.GetImage(refOrID)
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// TODO: shouldn't we error out if error is different from "not found" ?
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if image != nil {
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layer, err := newReleasableLayerForImage(image, daemon.layerStore)
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return image, layer, err
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}
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}
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image, err := daemon.pullForBuilder(ctx, refOrID, opts.AuthConfig, opts.Output)
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if err != nil {
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return nil, nil, err
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}
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layer, err := newReleasableLayerForImage(image, daemon.layerStore)
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return image, layer, err
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}
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