Remove Differ and Changer interfaces

Add the methods to the Driver interface
to force the drivers to implement the methods

aufs/aufs.go

@@ -210,11 +210,7 @@ func (a *AufsDriver) Diff(id string) (archive.Archive, error) {
 
 // Returns the size of the contents for the id
 func (a *AufsDriver) DiffSize(id string) (int64, error) {
-	p, err := a.Get(id)
-	if err != nil {
-		return -1, err
-	}
-	return utils.TreeSize(p)
+	return utils.TreeSize(path.Join(a.rootPath(), "diff", id))
 }
 
 func (a *AufsDriver) Changes(id string) ([]archive.Change, error) {

container.go

@@ -1479,10 +1479,13 @@ func validateID(id string) error {
 
 // GetSize, return real size, virtual size
 func (container *Container) GetSize() (int64, int64) {
-	var sizeRw, sizeRootfs int64
+	var (
+		sizeRw, sizeRootfs int64
+		err                error
+		driver             = container.runtime.driver
+	)
 
-	driver := container.runtime.driver
-	sizeRw, err := driver.DiffSize(container.ID)
+	sizeRw, err = driver.DiffSize(container.ID)
 	if err != nil {
 		utils.Errorf("Warning: driver %s couldn't return diff size of container %s: %s", driver, container.ID, err)
 		// FIXME: GetSize should return an error. Not changing it now in case

devmapper/driver.go

@@ -2,6 +2,7 @@ package devmapper
 
 import (
 	"fmt"
+	"github.com/dotcloud/docker/archive"
 	"github.com/dotcloud/docker/graphdriver"
 	"os"
 	"path"
@@ -60,6 +61,14 @@ func (d *Driver) DiffSize(id string) (int64, error) {
 	return -1, fmt.Errorf("Not implemented")
 }
 
+func (d *Driver) Diff(id string) (archive.Archive, error) {
+	return nil, fmt.Errorf("Not implemented)")
+}
+
+func (d *Driver) Changes(id string) ([]archive.Change, error) {
+	return nil, fmt.Errorf("asdlfj)")
+}
+
 func (d *Driver) mount(id, mp string) error {
 	// Create the target directories if they don't exist
 	if err := os.MkdirAll(mp, 0755); err != nil && !os.IsExist(err) {

graphdriver/driver.go

@@ -17,16 +17,10 @@ type Driver interface {
 	Get(id string) (dir string, err error)
 
 	DiffSize(id string) (bytes int64, err error)
-
-	Cleanup() error
-}
-
-type Changer interface {
+	Diff(id string) (archive.Archive, error)
 	Changes(id string) ([]archive.Change, error)
-}
 
-type Differ interface {
-	Diff(id string) (archive.Archive, error)
+	Cleanup() error
 }
 
 var (

graphdriver/dummy/driver.go

@@ -76,3 +76,11 @@ func (d *Driver) Get(id string) (string, error) {
 func (d *Driver) DiffSize(id string) (int64, error) {
 	return -1, fmt.Errorf("Not implemented")
 }
+
+func (d *Driver) Diff(id string) (archive.Archive, error) {
+	return nil, fmt.Errorf("Not implemented)")
+}
+
+func (d *Driver) Changes(id string) ([]archive.Change, error) {
+	return nil, fmt.Errorf("asdlfj)")
+}

runtime.go

@@ -18,7 +18,6 @@ import (
 	"os"
 	"os/exec"
 	"path"
-	"path/filepath"
 	"sort"
 	"strings"
 	"time"
@@ -734,49 +733,13 @@ func (runtime *Runtime) Unmount(container *Container) error {
 }
 
 func (runtime *Runtime) Changes(container *Container) ([]archive.Change, error) {
-	if changer, ok := runtime.driver.(graphdriver.Changer); ok {
-		return changer.Changes(container.ID)
-	}
-	cDir, err := runtime.driver.Get(container.ID)
-	if err != nil {
-		return nil, fmt.Errorf("Error getting container rootfs %s from driver %s: %s", container.ID, container.runtime.driver, err)
-	}
-	initDir, err := runtime.driver.Get(container.ID + "-init")
-	if err != nil {
-		return nil, fmt.Errorf("Error getting container init rootfs %s from driver %s: %s", container.ID, container.runtime.driver, err)
-	}
-	return archive.ChangesDirs(cDir, initDir)
+	// FIXME: Remove Changes method from runtime
+	return runtime.driver.Changes(container.ID)
 }
 
 func (runtime *Runtime) Diff(container *Container) (archive.Archive, error) {
-	if differ, ok := runtime.driver.(graphdriver.Differ); ok {
-		return differ.Diff(container.ID)
-	}
-
-	changes, err := runtime.Changes(container)
-	if err != nil {
-		return nil, err
-	}
-
-	cDir, err := runtime.driver.Get(container.ID)
-	if err != nil {
-		return nil, fmt.Errorf("Error getting container rootfs %s from driver %s: %s", container.ID, container.runtime.driver, err)
-	}
-
-	files := make([]string, 0)
-	deletions := make([]string, 0)
-	for _, change := range changes {
-		if change.Kind == archive.ChangeModify || change.Kind == archive.ChangeAdd {
-			files = append(files, change.Path)
-		}
-		if change.Kind == archive.ChangeDelete {
-			base := filepath.Base(change.Path)
-			dir := filepath.Dir(change.Path)
-			deletions = append(deletions, filepath.Join(dir, ".wh."+base))
-		}
-	}
-
-	return archive.TarFilter(cDir, archive.Uncompressed, files, false, deletions)
+	// FIXME: Remove Diff method from runtime
+	return runtime.driver.Diff(container.ID)
 }
 
 func linkLxcStart(root string) error {