convert last fmt.Error to the new format and drop name field

container.go

@@ -29,7 +29,6 @@ type Container struct {
 	container *C.struct_lxc_container
 	mu        sync.RWMutex
 
-	name      string
 	verbosity Verbosity
 }
 
@@ -163,7 +162,7 @@ func (c *Container) Snapshots() ([]Snapshot, error) {
 	defer freeSnapshots(csnapshots, size)
 
 	if size < 1 {
-		return nil, fmt.Errorf("%s has no snapshots", c.name)
+		return nil, ErrNoSnapshot
 	}
 
 	p := uintptr(unsafe.Pointer(csnapshots))

error.go

@@ -26,7 +26,9 @@ var (
 	ErrKMemLimit                     = NewError("your kernel does not support cgroup memory controller")
 	ErrLoadConfigFailed              = NewError("loading config file for the container failed")
 	ErrMemLimit                      = NewError("your kernel does not support cgroup memory controller")
+	ErrMemorySwapLimit               = NewError("your kernel does not support cgroup swap controller")
 	ErrNewFailed                     = NewError("allocating the container failed")
+	ErrNoSnapshot                    = NewError("container has no snapshot")
 	ErrNotDefined                    = NewError("container is not defined")
 	ErrNotFrozen                     = NewError("container is not frozen")
 	ErrNotRunning                    = NewError("container is not running")
@@ -44,7 +46,6 @@ var (
 	ErrShutdownFailed                = NewError("shutting down the container failed")
 	ErrStartFailed                   = NewError("starting the container failed")
 	ErrStopFailed                    = NewError("stopping the container failed")
-	ErrMemorySwapLimit               = NewError("your kernel does not support cgroup swap controller")
 	ErrUnfreezeFailed                = NewError("unfreezing the container failed")
 )
 

lxc.go

@@ -36,7 +36,7 @@ func NewContainer(name string, lxcpath ...string) (*Container, error) {
 	if container == nil {
 		return nil, ErrNewFailed
 	}
-	return &Container{container: container, verbosity: Quiet, name: name}, nil
+	return &Container{container: container, verbosity: Quiet}, nil
 }
 
 // GetContainer increments the reference counter of the container object.