Alter CGroup path handling for 'podman top'

Signed-off-by: Matthew Heon <[email protected]>

Closes: #507
Approved by: baude

Author: mheon

libpod/container_top.go

@@ -1,7 +1,6 @@
 package libpod
 
 import (
-	"fmt"
 	"io/ioutil"
 	"path/filepath"
 	"strings"
@@ -28,14 +27,20 @@ func (c *Container) GetContainerPids() ([]string, error) {
 // Gets the pids for a container without locking.  should only be called from a func where
 // locking has already been established.
 func (c *Container) getContainerPids() ([]string, error) {
-	taskFile := filepath.Join("/sys/fs/cgroup/pids", c.config.CgroupParent, fmt.Sprintf("libpod-conmon-%s", c.ID()), c.ID(), "tasks")
+	cgroupPath, err := c.CGroupPath()("")
+	if err != nil {
+		return nil, errors.Wrapf(err, "error getting cgroup path for container %s", c.ID())
+	}
+
+	taskFile := filepath.Join("/sys/fs/cgroup/pids", cgroupPath, "tasks")
+
 	logrus.Debug("reading pids from ", taskFile)
+
 	content, err := ioutil.ReadFile(taskFile)
 	if err != nil {
 		return []string{}, errors.Wrapf(err, "unable to read pids from %s", taskFile)
 	}
 	return strings.Fields(string(content)), nil
-
 }
 
 // GetContainerPidInformation calls ps with the appropriate options and returns