github.com/fcwu/docker@v1.4.2-0.20150115145920-2a69ca89f0df/daemon/execdriver/native/info.go (about)

     1  // +build linux,cgo
     2  
     3  package native
     4  
     5  import (
     6  	"os"
     7  	"path/filepath"
     8  
     9  	"github.com/docker/libcontainer"
    10  )
    11  
    12  type info struct {
    13  	ID     string
    14  	driver *driver
    15  }
    16  
    17  // IsRunning is determined by looking for the
    18  // pid file for a container.  If the file exists then the
    19  // container is currently running
    20  func (i *info) IsRunning() bool {
    21  	if _, err := libcontainer.GetState(filepath.Join(i.driver.root, i.ID)); err == nil {
    22  		return true
    23  	}
    24  	// TODO: Remove this part for version 1.2.0
    25  	// This is added only to ensure smooth upgrades from pre 1.1.0 to 1.1.0
    26  	if _, err := os.Stat(filepath.Join(i.driver.root, i.ID, "pid")); err == nil {
    27  		return true
    28  	}
    29  	return false
    30  }