Vendor libnetwork v0.6.0-rc4

- Add Endpoints() API to Sandbox interface
- Fixes #19677

Signed-off-by: Madhu Venugopal <madhu@docker.com>

hack/vendor.sh

@@ -27,7 +27,7 @@ clone git github.com/RackSec/srslog 6eb773f331e46fbba8eecb8e794e635e75fc04de
 clone git github.com/imdario/mergo 0.2.1
 
 #get libnetwork packages
-clone git github.com/docker/libnetwork v0.6.0-rc3
+clone git github.com/docker/libnetwork v0.6.0-rc4
 clone git github.com/armon/go-metrics eb0af217e5e9747e41dd5303755356b62d28e3ec
 clone git github.com/hashicorp/go-msgpack 71c2886f5a673a35f909803f38ece5810165097b
 clone git github.com/hashicorp/memberlist 9a1e242e454d2443df330bdd51a436d5a9058fc4

vendor/src/github.com/docker/libnetwork/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.6.0-rc4 (2016-01-25)
+- Add Endpoints() API to Sandbox interface
+- Fixed a race-condition in default gateway network creation
+
 ## 0.6.0-rc3 (2016-01-25)
 - Fixes docker/docker#19576
 - Fixed embedded DNS to listen in TCP as well

vendor/src/github.com/docker/libnetwork/default_gateway.go

@@ -12,6 +12,8 @@ const (
 	gwEPlen       = 12
 )
 
+var procGwNetwork = make(chan (bool), 1)
+
 /*
    libnetwork creates a bridge network "docker_gw_bridge" for provding
    default gateway for the containers if none of the container's endpoints
@@ -35,13 +37,11 @@ func (sb *sandbox) setupDefaultGW(srcEp *endpoint) error {
 		return nil
 	}
 
+	// Look for default gw network. In case of error (includes not found),
+	// retry and create it if needed in a serialized execution.
 	n, err := c.NetworkByName(libnGWNetwork)
 	if err != nil {
-		if _, ok := err.(types.NotFoundError); !ok {
-			return err
-		}
-		n, err = c.createGWNetwork()
-		if err != nil {
+		if n, err = c.defaultGwNetwork(); err != nil {
 			return err
 		}
 	}
@@ -150,3 +150,18 @@ func (sb *sandbox) getEPwithoutGateway() *endpoint {
 	}
 	return nil
 }
+
+// Looks for the default gw network and creates it if not there.
+// Parallel executions are serialized.
+func (c *controller) defaultGwNetwork() (Network, error) {
+	procGwNetwork <- true
+	defer func() { <-procGwNetwork }()
+
+	n, err := c.NetworkByName(libnGWNetwork)
+	if err != nil {
+		if _, ok := err.(types.NotFoundError); ok {
+			n, err = c.createGWNetwork()
+		}
+	}
+	return n, err
+}

vendor/src/github.com/docker/libnetwork/sandbox.go

@@ -47,6 +47,8 @@ type Sandbox interface {
 	// ResolveIP returns the service name for the passed in IP. IP is in reverse dotted
 	// notation; the format used for DNS PTR records
 	ResolveIP(name string) string
+	// Endpoints returns all the endpoints connected to the sandbox
+	Endpoints() []Endpoint
 }
 
 // SandboxOption is a option setter function type used to pass varios options to
@@ -347,6 +349,17 @@ func (sb *sandbox) setupResolutionFiles() error {
 	return nil
 }
 
+func (sb *sandbox) Endpoints() []Endpoint {
+	sb.Lock()
+	defer sb.Unlock()
+
+	endpoints := make([]Endpoint, len(sb.endpoints))
+	for i, ep := range sb.endpoints {
+		endpoints[i] = ep
+	}
+	return endpoints
+}
+
 func (sb *sandbox) getConnectedEndpoints() []*endpoint {
 	sb.Lock()
 	defer sb.Unlock()