mirror of https://github.com/docker/docs.git
127 lines
3.1 KiB
Go
127 lines
3.1 KiB
Go
//+build !windows
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package daemon
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import (
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"fmt"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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"github.com/docker/engine-api/types"
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)
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func validatePSArgs(psArgs string) error {
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// NOTE: \\s does not detect unicode whitespaces.
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// So we use fieldsASCII instead of strings.Fields in parsePSOutput.
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// See https://github.com/docker/docker/pull/24358
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re := regexp.MustCompile("\\s+([^\\s]*)=\\s*(PID[^\\s]*)")
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for _, group := range re.FindAllStringSubmatch(psArgs, -1) {
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if len(group) >= 3 {
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k := group[1]
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v := group[2]
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if k != "pid" {
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return fmt.Errorf("specifying \"%s=%s\" is not allowed", k, v)
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}
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}
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}
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return nil
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}
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// fieldsASCII is similar to strings.Fields but only allows ASCII whitespaces
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func fieldsASCII(s string) []string {
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fn := func(r rune) bool {
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switch r {
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case '\t', '\n', '\f', '\r', ' ':
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return true
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}
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return false
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}
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return strings.FieldsFunc(s, fn)
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}
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func parsePSOutput(output []byte, pids []int) (*types.ContainerProcessList, error) {
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procList := &types.ContainerProcessList{}
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lines := strings.Split(string(output), "\n")
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procList.Titles = fieldsASCII(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, fmt.Errorf("Couldn't find PID field in ps output")
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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 := fieldsASCII(line)
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p, err := strconv.Atoi(fields[pidIndex])
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if err != nil {
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return nil, fmt.Errorf("Unexpected pid '%s': %s", 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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return procList, nil
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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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if err := validatePSArgs(psArgs); err != nil {
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return nil, err
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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, errNotRunning{container.ID}
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}
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if container.IsRestarting() {
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return nil, errContainerIsRestarting(container.ID)
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}
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pids, err := daemon.containerd.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, fmt.Errorf("Error running ps: %v", err)
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}
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procList, err := parsePSOutput(output, pids)
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if err != nil {
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return nil, err
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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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