Update signal to USR1 for backwards compat

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

libcontainer/container.go

@@ -76,13 +76,13 @@ type BaseContainer interface {
 	//
 	// errors:
 	// ContainerDestroyed - Container no longer exists,
-	// Systemerror - System error.
+	// SystemError - System error.
 	Status() (Status, error)
 
 	// State returns the current container's state information.
 	//
 	// errors:
-	// Systemerror - System error.
+	// SystemError - System error.
 	State() (*State, error)
 
 	// Returns the current config of the container.
@@ -92,7 +92,7 @@ type BaseContainer interface {
 	//
 	// errors:
 	// ContainerDestroyed - Container no longer exists,
-	// Systemerror - System error.
+	// SystemError - System error.
 	//
 	// Some of the returned PIDs may no longer refer to processes in the Container, unless
 	// the Container state is PAUSED in which case every PID in the slice is valid.
@@ -102,15 +102,15 @@ type BaseContainer interface {
 	//
 	// errors:
 	// ContainerDestroyed - Container no longer exists,
-	// Systemerror - System error.
+	// SystemError - System error.
 	Stats() (*Stats, error)
 
 	// Set resources of container as configured
 	//
 	// We can use this to change resources when containers are running.
 	//
 	// errors:
-	// Systemerror - System error.
+	// SystemError - System error.
 	Set(config configs.Config) error
 
 	// Start a process inside the container. Returns error if process fails to
@@ -120,7 +120,7 @@ type BaseContainer interface {
 	// ContainerDestroyed - Container no longer exists,
 	// ConfigInvalid - config is invalid,
 	// ContainerPaused - Container is paused,
-	// Systemerror - System error.
+	// SystemError - System error.
 	Start(process *Process) (err error)
 
 	// StartI immediatly starts the process inside the conatiner.  Returns error if process
@@ -131,7 +131,7 @@ type BaseContainer interface {
 	// ContainerDestroyed - Container no longer exists,
 	// ConfigInvalid - config is invalid,
 	// ContainerPaused - Container is paused,
-	// Systemerror - System error.
+	// SystemError - System error.
 	StartI(process *Process) (err error)
 
 	// Destroys the container after killing all running processes.
@@ -140,12 +140,12 @@ type BaseContainer interface {
 	// No error is returned if the container is already destroyed.
 	//
 	// errors:
-	// Systemerror - System error.
+	// SystemError - System error.
 	Destroy() error
 
 	// Signal sends the provided signal code to the container's initial process.
 	//
 	// errors:
-	// Systemerror - System error.
+	// SystemError - System error.
 	Signal(s os.Signal) error
 }

libcontainer/container_linux.go

@@ -31,7 +31,7 @@ const stdioFdCount = 3
 
 // InitContinueSignal is used to signal the container init process to
 // start the users specified process after the container create has finished.
-const InitContinueSignal = syscall.SIGCONT
+const InitContinueSignal = syscall.SIGUSR1
 
 type linuxContainer struct {
 	id            string
@@ -1089,10 +1089,8 @@ func (c *linuxContainer) runType() (Status, error) {
 		return Stopped, newSystemErrorWithCausef(err, "reading /proc/%d/environ", pid)
 	}
 	check := []byte("_LIBCONTAINER")
-	for _, v := range bytes.Split(environ, []byte("\x00")) {
-		if bytes.Contains(v, check) {
-			return Created, nil
-		}
+	if bytes.Contains(environ, check) {
+		return Created, nil
 	}
 	return Running, nil
 }

libcontainer/integration/template_test.go

@@ -89,14 +89,12 @@ func newTemplateConfig(rootfs string) *configs.Config {
 				Data:        "mode=1777,size=65536k",
 				Flags:       defaultMountFlags,
 			},
-			/*
-				{
-					Source:      "mqueue",
-					Destination: "/dev/mqueue",
-					Device:      "mqueue",
-					Flags:       defaultMountFlags,
-				},
-			*/
+			{
+				Source:      "mqueue",
+				Destination: "/dev/mqueue",
+				Device:      "mqueue",
+				Flags:       defaultMountFlags,
+			},
 			{
 				Source:      "sysfs",
 				Destination: "/sys",