Fix bug introduced in c7a944caf2 which caused 'docker images' to crash

docker.go

@@ -7,7 +7,7 @@ import (
 	"log"
 	"os"
 	"path"
-	"github.com/dotcloud/docker/image"	// For sorting utility
+	"sort"
 )
 
 type Docker struct {
@@ -17,15 +17,11 @@ type Docker struct {
 }
 
 func (docker *Docker) List() []*Container {
-	history := new(image.History)
+	containers := new(History)
 	for e := docker.containers.Front(); e != nil; e = e.Next() {
-		history.Add(e.Value.(*Container))
+		containers.Add(e.Value.(*Container))
 	}
-	containers := make([]*Container, len(*history))
-	for i := range *history {
-		containers[i] = (*history)[i].(*Container)
-	}
-	return containers
+	return *containers
 }
 
 func (docker *Docker) getContainerElement(id string) *list.Element {
@@ -120,3 +116,28 @@ func NewFromDirectory(root string) (*Docker, error) {
 	}
 	return docker, nil
 }
+
+
+type History []*Container
+
+func (history *History) Len() int {
+	return len(*history)
+}
+
+func (history *History) Less(i, j int) bool {
+	containers := *history
+	return containers[j].When().Before(containers[i].When())
+}
+
+func (history *History) Swap(i, j int) {
+	containers := *history
+	tmp := containers[i]
+	containers[i] = containers[j]
+	containers[j] = tmp
+}
+
+func (history *History) Add(container *Container) {
+	*history = append(*history, container)
+	sort.Sort(history)
+}
+

dockerd/dockerd.go

@@ -288,8 +288,7 @@ func (srv *Server) CmdImages(stdin io.ReadCloser, stdout io.Writer, args ...stri
 		if nameFilter != "" && nameFilter != name {
 			continue
 		}
-		for idx, evt := range *srv.images.ByName[name] {
-			img := evt.(*image.Image)
+		for idx, img := range *srv.images.ByName[name] {
 			if *limit > 0 && idx >= *limit {
 				break
 			}

image/image.go

@@ -102,7 +102,7 @@ func (index *Index) Find(idOrName string) *Image {
 	}
 	// Lookup by name
 	if history, exists := index.ByName[idOrName]; exists && history.Len() > 0 {
-		return (*history)[0].(*Image)
+		return (*history)[0]
 	}
 	return nil
 }
@@ -116,7 +116,7 @@ func (index *Index) Add(name string, image *Image) error {
 		index.ByName[name] = new(History)
 	} else {
 		// If this image is already the latest version, don't add it.
-		if (*index.ByName[name])[0].(*Image).Id == image.Id {
+		if (*index.ByName[name])[0].Id == image.Id {
 			return nil
 		}
 	}
@@ -169,8 +169,7 @@ func (index *Index) Rename(oldName, newName string) error {
 	index.ByName[newName] = index.ByName[oldName]
 	delete(index.ByName, oldName)
 	// Change the ID of all images, since they include the name
-	for _, event := range *index.ByName[newName] {
-		image := event.(*Image)
+	for _, image := range *index.ByName[newName] {
 		if id, err := generateImageId(newName, image.Layers); err != nil {
 			return err
 		} else {
@@ -228,33 +227,37 @@ func (index *Index) save() error {
 
 // History wraps an array of images so they can be sorted by date (most recent first)
 
-type Event interface {
-	When() time.Time
-}
-
-type History []Event
+type History []*Image
 
 func (history *History) Len() int {
 	return len(*history)
 }
 
 func (history *History) Less(i, j int) bool {
-	events := *history
-	return events[j].When().Before(events[i].When())
+	images := *history
+	return images[j].Created.Before(images[i].Created)
 }
 
 func (history *History) Swap(i, j int) {
-	events := *history
-	tmp := events[i]
-	events[i] = events[j]
-	events[j] = tmp
+	images := *history
+	tmp := images[i]
+	images[i] = images[j]
+	images[j] = tmp
 }
 
-func (history *History) Add(event Event) {
-	*history = append(*history, event)
+func (history *History) Add(image *Image) {
+	*history = append(*history, image)
 	sort.Sort(history)
 }
 
+func (history *History) Del(id string) {
+	for idx, image := range *history {
+		if image.Id == id {
+			*history = append((*history)[:idx], (*history)[idx + 1:]...)
+		}
+	}
+}
+
 type Image struct {
 	Id	string		// Globally unique identifier
 	Layers	[]string	// Absolute paths
@@ -262,10 +265,6 @@ type Image struct {
 	Parent	string
 }
 
-func (image *Image) When() time.Time {
-	return image.Created
-}
-
 func (image *Image) IdParts() (string, string) {
 	if len(image.Id) < 8 {
 		return "", image.Id