137 lines
3 KiB
Go
137 lines
3 KiB
Go
// +build linux
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package main
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"text/tabwriter"
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"time"
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"encoding/json"
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"github.com/codegangsta/cli"
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)
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const formatOptions = `table or json`
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// containerState represents the platform agnostic pieces relating to a
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// running container's status and state
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type containerState struct {
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// ID is the container ID
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ID string `json:"id"`
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// InitProcessPid is the init process id in the parent namespace
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InitProcessPid int `json:"pid"`
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// Status is the current status of the container, running, paused, ...
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Status string `json:"status"`
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// Bundle is the path on the filesystem to the bundle
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Bundle string `json:"bundle"`
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// Created is the unix timestamp for the creation time of the container in UTC
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Created time.Time `json:"created"`
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}
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var listCommand = cli.Command{
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Name: "list",
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Usage: "lists containers started by runc with the given root",
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "format, f",
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Value: "",
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Usage: `select one of: ` + formatOptions + `.
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The default format is table. The following will output the list of containers
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in json format:
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# runc list -f json`,
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},
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},
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Action: func(context *cli.Context) {
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s, err := getContainers(context)
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if err != nil {
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fatal(err)
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}
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switch context.String("format") {
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case "", "table":
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w := tabwriter.NewWriter(os.Stdout, 12, 1, 3, ' ', 0)
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fmt.Fprint(w, "ID\tPID\tSTATUS\tBUNDLE\tCREATED\n")
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for _, item := range s {
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fmt.Fprintf(w, "%s\t%d\t%s\t%s\t%s\n",
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item.ID,
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item.InitProcessPid,
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item.Status,
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item.Bundle,
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item.Created.Format(time.RFC3339Nano))
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}
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if err := w.Flush(); err != nil {
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fatal(err)
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}
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case "json":
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data, err := json.Marshal(s)
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if err != nil {
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fatal(err)
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}
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os.Stdout.Write(data)
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default:
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fatalf("invalid format option")
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}
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},
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}
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func getContainers(context *cli.Context) ([]containerState, error) {
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factory, err := loadFactory(context)
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if err != nil {
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return nil, err
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}
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root := context.GlobalString("root")
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absRoot, err := filepath.Abs(root)
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if err != nil {
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return nil, err
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}
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list, err := ioutil.ReadDir(absRoot)
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if err != nil {
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fatal(err)
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}
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var s []containerState
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for _, item := range list {
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if item.IsDir() {
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container, err := factory.Load(item.Name())
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if err != nil {
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return nil, err
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}
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containerStatus, err := container.Status()
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if err != nil {
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return nil, err
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}
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state, err := container.State()
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if err != nil {
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return nil, err
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}
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s = append(s, containerState{
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ID: state.BaseState.ID,
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InitProcessPid: state.BaseState.InitProcessPid,
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Status: containerStatus.String(),
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Bundle: searchLabels(state.Config.Labels, "bundle"),
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Created: state.BaseState.Created})
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}
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}
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return s, nil
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}
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func searchLabels(labels []string, query string) string {
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for _, l := range labels {
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parts := strings.SplitN(l, "=", 2)
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if len(parts) < 2 {
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continue
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}
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if parts[0] == query {
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return parts[1]
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}
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}
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return ""
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}
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