'docker {history,ps,images}': show human-friendly image names when ap…

…plicable

commands.go

@@ -311,7 +311,7 @@ func (srv *Server) CmdHistory(stdin io.ReadCloser, stdout io.Writer, args ...str
 	fmt.Fprintf(w, "ID\tCREATED\tCREATED BY\n")
 	return image.WalkHistory(func(img *Image) error {
 		fmt.Fprintf(w, "%s\t%s\t%s\n",
-			img.Id,
+			srv.runtime.repositories.ImageName(img.Id),
 			HumanDuration(time.Now().Sub(img.Created))+" ago",
 			strings.Join(img.ParentCommand, " "),
 		)
@@ -514,7 +514,7 @@ func (srv *Server) CmdImages(stdin io.ReadCloser, stdout io.Writer, args ...stri
 					/* TAG */ tag,
 					/* ID */ id,
 					/* CREATED */ HumanDuration(time.Now().Sub(image.Created)) + " ago",
-					/* PARENT */ image.Parent,
+					/* PARENT */ srv.runtime.repositories.ImageName(image.Parent),
 				} {
 					if idx == 0 {
 						w.Write([]byte(field))
@@ -537,7 +537,7 @@ func (srv *Server) CmdImages(stdin io.ReadCloser, stdout io.Writer, args ...stri
 					/* TAG */ "",
 					/* ID */ id,
 					/* CREATED */ HumanDuration(time.Now().Sub(image.Created)) + " ago",
-					/* PARENT */ image.Parent,
+					/* PARENT */ srv.runtime.repositories.ImageName(image.Parent),
 				} {
 					if idx == 0 {
 						w.Write([]byte(field))
@@ -581,7 +581,7 @@ func (srv *Server) CmdPs(stdin io.ReadCloser, stdout io.Writer, args ...string)
 			}
 			for idx, field := range []string{
 				/* ID */ container.Id,
-				/* IMAGE */ container.Image,
+				/* IMAGE */ srv.runtime.repositories.ImageName(container.Image),
 				/* COMMAND */ command,
 				/* CREATED */ HumanDuration(time.Now().Sub(container.Created)) + " ago",
 				/* STATUS */ container.State.String(),

tags.go

@@ -83,6 +83,30 @@ func (store *TagStore) LookupImage(name string) (*Image, error) {
 	return img, nil
 }
 
+// Return a reverse-lookup table of all the names which refer to each image
+// Eg. {"43b5f19b10584": {"base:latest", "base:v1"}}
+func (store *TagStore) ById() map[string][]string {
+	byId := make(map[string][]string)
+	for repoName, repository := range store.Repositories {
+		for tag, id := range repository {
+			name := repoName + ":" + tag
+			if _, exists := byId[id]; !exists {
+				byId[id] = []string{name}
+			} else {
+				byId[id] = append(byId[id], name)
+			}
+		}
+	}
+	return byId
+}
+
+func (store *TagStore) ImageName(id string) string {
+	if names, exists := store.ById()[id]; exists && len(names) > 0 {
+		return names[0]
+	}
+	return id
+}
+
 func (store *TagStore) Set(repoName, tag, imageName string, force bool) error {
 	img, err := store.LookupImage(imageName)
 	if err != nil {