81 lines
2 KiB
Go
81 lines
2 KiB
Go
//+build !windows
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package daemon
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import (
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"os/exec"
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"strconv"
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"strings"
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derr "github.com/docker/docker/errors"
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"github.com/docker/engine-api/types"
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)
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// ContainerTop lists the processes running inside of the given
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// container by calling ps with the given args, or with the flags
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// "-ef" if no args are given. An error is returned if the container
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// is not found, or is not running, or if there are any problems
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// running ps, or parsing the output.
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func (daemon *Daemon) ContainerTop(name string, psArgs string) (*types.ContainerProcessList, error) {
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if psArgs == "" {
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psArgs = "-ef"
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}
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container, err := daemon.GetContainer(name)
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if err != nil {
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return nil, err
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}
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if !container.IsRunning() {
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return nil, derr.ErrorCodeNotRunning.WithArgs(name)
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}
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pids, err := daemon.ExecutionDriver().GetPidsForContainer(container.ID)
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if err != nil {
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return nil, err
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}
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output, err := exec.Command("ps", strings.Split(psArgs, " ")...).Output()
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if err != nil {
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return nil, derr.ErrorCodePSError.WithArgs(err)
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}
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procList := &types.ContainerProcessList{}
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lines := strings.Split(string(output), "\n")
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procList.Titles = strings.Fields(lines[0])
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pidIndex := -1
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for i, name := range procList.Titles {
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if name == "PID" {
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pidIndex = i
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}
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}
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if pidIndex == -1 {
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return nil, derr.ErrorCodeNoPID
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}
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// loop through the output and extract the PID from each line
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for _, line := range lines[1:] {
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if len(line) == 0 {
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continue
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}
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fields := strings.Fields(line)
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p, err := strconv.Atoi(fields[pidIndex])
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if err != nil {
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return nil, derr.ErrorCodeBadPID.WithArgs(fields[pidIndex], err)
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}
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for _, pid := range pids {
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if pid == p {
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// Make sure number of fields equals number of header titles
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// merging "overhanging" fields
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process := fields[:len(procList.Titles)-1]
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process = append(process, strings.Join(fields[len(procList.Titles)-1:], " "))
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procList.Processes = append(procList.Processes, process)
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}
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}
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}
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daemon.LogContainerEvent(container, "top")
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return procList, nil
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}
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