Use entrypoint to detect weave router

proxy/common.go

@@ -20,6 +20,7 @@ import (
 var (
 	containerIDRegexp   = regexp.MustCompile("^(/v[0-9\\.]*)?/containers/([^/]*)/.*")
 	weaveWaitEntrypoint = []string{"/w/w"}
+	weaveEntrypoint     = "/home/weave/weaver"
 )
 
 func callWeave(args ...string) ([]byte, []byte, error) {

proxy/proxy.go

@@ -316,7 +316,7 @@ func containerShouldAttach(container *docker.Container) bool {
 }
 
 func containerIsWeaveRouter(container *docker.Container) bool {
-	return strings.HasPrefix(container.Config.Image, "weaveworks/weave")
+	return len(container.Config.Entrypoint) > 0 && container.Config.Entrypoint[0] == weaveEntrypoint
 }
 
 func (proxy *Proxy) createWait(r *http.Request, ident string) {
@@ -393,7 +393,7 @@ func (proxy *Proxy) attach(container *docker.Container, orDie bool) error {
 }
 
 func (proxy *Proxy) attachRouter(container *docker.Container) error {
-	Log.Infof("Attaching weave router container")
+	Log.Infof("Attaching weave router container:", container.ID)
 	args := []string{"attach-router"}
 	if _, stderr, err := callWeave(args...); err != nil {
 		Log.Warningf("Attaching container %s to weave network failed: %s", container.ID, string(stderr))