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123 lines
3.1 KiB
Go
123 lines
3.1 KiB
Go
package dockerfile // import "github.com/docker/docker/builder/dockerfile"
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import (
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"runtime"
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"github.com/docker/docker/api/types/backend"
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"github.com/docker/docker/builder"
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dockerimage "github.com/docker/docker/image"
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"github.com/docker/docker/pkg/system"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"golang.org/x/net/context"
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)
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type getAndMountFunc func(string, bool) (builder.Image, builder.ROLayer, error)
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// imageSources mounts images and provides a cache for mounted images. It tracks
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// all images so they can be unmounted at the end of the build.
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type imageSources struct {
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byImageID map[string]*imageMount
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mounts []*imageMount
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getImage getAndMountFunc
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}
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func newImageSources(ctx context.Context, options builderOptions) *imageSources {
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getAndMount := func(idOrRef string, localOnly bool) (builder.Image, builder.ROLayer, error) {
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pullOption := backend.PullOptionNoPull
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if !localOnly {
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if options.Options.PullParent {
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pullOption = backend.PullOptionForcePull
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} else {
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pullOption = backend.PullOptionPreferLocal
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}
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}
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optionsPlatform := system.ParsePlatform(options.Options.Platform)
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return options.Backend.GetImageAndReleasableLayer(ctx, idOrRef, backend.GetImageAndLayerOptions{
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PullOption: pullOption,
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AuthConfig: options.Options.AuthConfigs,
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Output: options.ProgressWriter.Output,
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OS: optionsPlatform.OS,
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})
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}
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return &imageSources{
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byImageID: make(map[string]*imageMount),
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getImage: getAndMount,
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}
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}
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func (m *imageSources) Get(idOrRef string, localOnly bool) (*imageMount, error) {
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if im, ok := m.byImageID[idOrRef]; ok {
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return im, nil
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}
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image, layer, err := m.getImage(idOrRef, localOnly)
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if err != nil {
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return nil, err
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}
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im := newImageMount(image, layer)
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m.Add(im)
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return im, nil
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}
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func (m *imageSources) Unmount() (retErr error) {
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for _, im := range m.mounts {
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if err := im.unmount(); err != nil {
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logrus.Error(err)
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retErr = err
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}
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}
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return
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}
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func (m *imageSources) Add(im *imageMount) {
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switch im.image {
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case nil:
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// set the OS for scratch images
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os := runtime.GOOS
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// Windows does not support scratch except for LCOW
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if runtime.GOOS == "windows" {
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os = "linux"
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}
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im.image = &dockerimage.Image{V1Image: dockerimage.V1Image{OS: os}}
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default:
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m.byImageID[im.image.ImageID()] = im
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}
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m.mounts = append(m.mounts, im)
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}
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// imageMount is a reference to an image that can be used as a builder.Source
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type imageMount struct {
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image builder.Image
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source builder.Source
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layer builder.ROLayer
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}
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func newImageMount(image builder.Image, layer builder.ROLayer) *imageMount {
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im := &imageMount{image: image, layer: layer}
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return im
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}
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func (im *imageMount) unmount() error {
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if im.layer == nil {
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return nil
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}
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if err := im.layer.Release(); err != nil {
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return errors.Wrapf(err, "failed to unmount previous build image %s", im.image.ImageID())
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}
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im.layer = nil
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return nil
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}
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func (im *imageMount) Image() builder.Image {
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return im.image
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}
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func (im *imageMount) NewRWLayer() (builder.RWLayer, error) {
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return im.layer.NewRWLayer()
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}
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func (im *imageMount) ImageID() string {
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return im.image.ImageID()
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}
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