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moby--moby/graph/graph_windows.go
John Howard 52f4d09ffb Windows: Graph driver implementation
Signed-off-by: John Howard <jhoward@microsoft.com>
2015-07-10 14:33:11 -07:00

160 lines
4.4 KiB
Go

// +build windows
package graph
import (
"encoding/json"
"fmt"
"os"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/graphdriver/windows"
"github.com/docker/docker/pkg/archive"
)
// setupInitLayer populates a directory with mountpoints suitable
// for bind-mounting dockerinit into the container. T
func SetupInitLayer(initLayer string) error {
return nil
}
func createRootFilesystemInDriver(graph *Graph, img *Image, layerData archive.ArchiveReader) error {
if wd, ok := graph.driver.(*windows.WindowsGraphDriver); ok {
if img.Container != "" && layerData == nil {
logrus.Debugf("Copying from container %s.", img.Container)
var ids []string
if img.Parent != "" {
parentImg, err := graph.Get(img.Parent)
if err != nil {
return err
}
ids, err = graph.ParentLayerIds(parentImg)
if err != nil {
return err
}
}
if err := wd.CopyDiff(img.Container, img.ID, wd.LayerIdsToPaths(ids)); err != nil {
return fmt.Errorf("Driver %s failed to copy image rootfs %s: %s", graph.driver, img.Container, err)
}
} else if img.Parent == "" {
if err := graph.driver.Create(img.ID, img.Parent); err != nil {
return fmt.Errorf("Driver %s failed to create image rootfs %s: %s", graph.driver, img.ID, err)
}
}
} else {
// This fallback allows the use of VFS during daemon development.
if err := graph.driver.Create(img.ID, img.Parent); err != nil {
return fmt.Errorf("Driver %s failed to create image rootfs %s: %s", graph.driver, img.ID, err)
}
}
return nil
}
func (graph *Graph) restoreBaseImages() ([]string, error) {
// TODO Windows. This needs implementing (@swernli)
return nil, nil
}
// ParentLayerIds returns a list of all parent image IDs for the given image.
func (graph *Graph) ParentLayerIds(img *Image) (ids []string, err error) {
for i := img; i != nil && err == nil; i, err = graph.GetParent(i) {
ids = append(ids, i.ID)
}
return
}
// storeImage stores file system layer data for the given image to the
// graph's storage driver. Image metadata is stored in a file
// at the specified root directory.
func (graph *Graph) storeImage(img *Image, layerData archive.ArchiveReader, root string) (err error) {
if wd, ok := graph.driver.(*windows.WindowsGraphDriver); ok {
// Store the layer. If layerData is not nil and this isn't a base image,
// unpack it into the new layer
if layerData != nil && img.Parent != "" {
var ids []string
if img.Parent != "" {
parentImg, err := graph.Get(img.Parent)
if err != nil {
return err
}
ids, err = graph.ParentLayerIds(parentImg)
if err != nil {
return err
}
}
if img.Size, err = wd.Import(img.ID, layerData, wd.LayerIdsToPaths(ids)); err != nil {
return err
}
}
if err := graph.saveSize(root, int(img.Size)); err != nil {
return err
}
f, err := os.OpenFile(jsonPath(root), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0600))
if err != nil {
return err
}
defer f.Close()
return json.NewEncoder(f).Encode(img)
} else {
// We keep this functionality here so that we can still work with the
// VFS driver during development. This will not be used for actual running
// of Windows containers. Without this code, it would not be possible to
// docker pull using the VFS driver.
// Store the layer. If layerData is not nil, unpack it into the new layer
if layerData != nil {
if img.Size, err = graph.driver.ApplyDiff(img.ID, img.Parent, layerData); err != nil {
return err
}
}
if err := graph.saveSize(root, int(img.Size)); err != nil {
return err
}
f, err := os.OpenFile(jsonPath(root), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0600))
if err != nil {
return err
}
defer f.Close()
return json.NewEncoder(f).Encode(img)
}
}
// TarLayer returns a tar archive of the image's filesystem layer.
func (graph *Graph) TarLayer(img *Image) (arch archive.Archive, err error) {
if wd, ok := graph.driver.(*windows.WindowsGraphDriver); ok {
var ids []string
if img.Parent != "" {
parentImg, err := graph.Get(img.Parent)
if err != nil {
return nil, err
}
ids, err = graph.ParentLayerIds(parentImg)
if err != nil {
return nil, err
}
}
return wd.Export(img.ID, wd.LayerIdsToPaths(ids))
} else {
// We keep this functionality here so that we can still work with the VFS
// driver during development. VFS is not supported (and just will not work)
// for Windows containers.
return graph.driver.Diff(img.ID, img.Parent)
}
}