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package libpod
import (
"fmt"
"io/ioutil"
"path/filepath"
"strings"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/utils"
"github.com/sirupsen/logrus"
)
// GetContainerPids reads sysfs to obtain the pids associated with the container's cgroup
// and uses locking
func (c *Container) GetContainerPids() ([]string, error) {
if !c.locked {
c.lock.Lock()
defer c.lock.Unlock()
if err := c.syncContainer(); err != nil {
return []string{}, errors.Wrapf(err, "error updating container %s state", c.ID())
}
}
return c.getContainerPids()
}
// 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")
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
// the results as a string
func (c *Container) GetContainerPidInformation(args []string) ([]string, error) {
if !c.locked {
c.lock.Lock()
defer c.lock.Unlock()
if err := c.syncContainer(); err != nil {
return []string{}, errors.Wrapf(err, "error updating container %s state", c.ID())
}
}
pids, err := c.getContainerPids()
if err != nil {
return []string{}, errors.Wrapf(err, "unable to obtain pids for ", c.ID())
}
args = append(args, "-p", strings.Join(pids, ","))
logrus.Debug("Executing: ", strings.Join(args, " "))
results, err := utils.ExecCmd("ps", args...)
if err != nil {
return []string{}, errors.Wrapf(err, "unable to obtain information about pids")
}
return strings.Split(results, "\n"), nil
}
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