moby/daemon/top.go

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package daemon
import (
"os/exec"
"strconv"
"strings"
"github.com/docker/docker/engine"
)
func (daemon *Daemon) ContainerTop(job *engine.Job) engine.Status {
if len(job.Args) != 1 && len(job.Args) != 2 {
return job.Errorf("Not enough arguments. Usage: %s CONTAINER [PS_ARGS]\n", job.Name)
}
var (
name = job.Args[0]
psArgs = "-ef"
)
if len(job.Args) == 2 && job.Args[1] != "" {
psArgs = job.Args[1]
}
if container := daemon.Get(name); container != nil {
if !container.IsRunning() {
return job.Errorf("Container %s is not running", name)
}
pids, err := daemon.ExecutionDriver().GetPidsForContainer(container.ID)
if err != nil {
return job.Error(err)
}
output, err := exec.Command("ps", strings.Split(psArgs, " ")...).Output()
if err != nil {
return job.Errorf("Error running ps: %s", err)
}
lines := strings.Split(string(output), "\n")
header := strings.Fields(lines[0])
out := &engine.Env{}
out.SetList("Titles", header)
pidIndex := -1
for i, name := range header {
if name == "PID" {
pidIndex = i
}
}
if pidIndex == -1 {
return job.Errorf("Couldn't find PID field in ps output")
}
processes := [][]string{}
for _, line := range lines[1:] {
if len(line) == 0 {
continue
}
fields := strings.Fields(line)
p, err := strconv.Atoi(fields[pidIndex])
if err != nil {
return job.Errorf("Unexpected pid '%s': %s", fields[pidIndex], err)
}
for _, pid := range pids {
if pid == p {
// Make sure number of fields equals number of header titles
// merging "overhanging" fields
process := fields[:len(header)-1]
process = append(process, strings.Join(fields[len(header)-1:], " "))
processes = append(processes, process)
}
}
}
out.SetJson("Processes", processes)
out.WriteTo(job.Stdout)
return engine.StatusOK
}
return job.Errorf("No such container: %s", name)
}