fix compiler unit tests, hook up daemon

internal/docker/image/image.go

@@ -4,7 +4,11 @@
 
 package image
 
-import "github.com/docker/distribution/reference"
+import (
+	"strings"
+
+	"github.com/docker/distribution/reference"
+)
 
 // Trim returns the short image name without tag.
 func Trim(name string) string {
@@ -69,3 +73,9 @@ func MatchHostname(image, hostname string) bool {
 	}
 	return reference.Domain(named) == hostname
 }
+
+// IsLatest parses the image and returns true if
+// the image uses the :latest tag.
+func IsLatest(s string) bool {
+	return strings.HasSuffix(Expand(s), ":latest")
+}