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// +build linux
package main
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"text/tabwriter"
"time"
"encoding/json"
"github.com/opencontainers/runc/libcontainer"
"github.com/opencontainers/runc/libcontainer/utils"
"github.com/urfave/cli"
)
const formatOptions = `table or json`
// containerState represents the platform agnostic pieces relating to a
// running container's status and state
type containerState struct {
// Version is the OCI version for the container
Version string `json:"ociVersion"`
// ID is the container ID
ID string `json:"id"`
// InitProcessPid is the init process id in the parent namespace
InitProcessPid int `json:"pid"`
// Status is the current status of the container, running, paused, ...
Status string `json:"status"`
// Bundle is the path on the filesystem to the bundle
Bundle string `json:"bundle"`
// Rootfs is a path to a directory containing the container's root filesystem.
Rootfs string `json:"rootfs"`
// Created is the unix timestamp for the creation time of the container in UTC
Created time.Time `json:"created"`
// Annotations is the user defined annotations added to the config.
Annotations map[string]string `json:"annotations,omitempty"`
}
var listCommand = cli.Command{
Name: "list",
Usage: "lists containers started by runc with the given root",
ArgsUsage: `
Where the given root is specified via the global option "--root"
(default: "/run/runc").
EXAMPLE 1:
To list containers created via the default "--root":
# runc list
EXAMPLE 2:
To list containers created using a non-default value for "--root":
# runc --root value list`,
Flags: []cli.Flag{
cli.StringFlag{
Name: "format, f",
Value: "table",
Usage: `select one of: ` + formatOptions,
},
cli.BoolFlag{
Name: "quiet, q",
Usage: "display only container IDs",
},
},
Action: func(context *cli.Context) error {
if err := checkArgs(context, 0, exactArgs); err != nil {
return err
}
s, err := getContainers(context)
if err != nil {
return err
}
if context.Bool("quiet") {
for _, item := range s {
fmt.Println(item.ID)
}
return nil
}
switch context.String("format") {
case "table":
w := tabwriter.NewWriter(os.Stdout, 12, 1, 3, ' ', 0)
fmt.Fprint(w, "ID\tPID\tSTATUS\tBUNDLE\tCREATED\n")
for _, item := range s {
fmt.Fprintf(w, "%s\t%d\t%s\t%s\t%s\n",
item.ID,
item.InitProcessPid,
item.Status,
item.Bundle,
item.Created.Format(time.RFC3339Nano))
}
if err := w.Flush(); err != nil {
return err
}
case "json":
if err := json.NewEncoder(os.Stdout).Encode(s); err != nil {
return err
}
default:
return fmt.Errorf("invalid format option")
}
return nil
},
}
func getContainers(context *cli.Context) ([]containerState, error) {
factory, err := loadFactory(context)
if err != nil {
return nil, err
}
root := context.GlobalString("root")
absRoot, err := filepath.Abs(root)
if err != nil {
return nil, err
}
list, err := ioutil.ReadDir(absRoot)
if err != nil {
fatal(err)
}
var s []containerState
for _, item := range list {
if item.IsDir() {
container, err := factory.Load(item.Name())
if err != nil {
fmt.Fprintf(os.Stderr, "load container %s: %v\n", item.Name(), err)
continue
}
containerStatus, err := container.Status()
if err != nil {
fmt.Fprintf(os.Stderr, "status for %s: %v\n", item.Name(), err)
continue
}
state, err := container.State()
if err != nil {
fmt.Fprintf(os.Stderr, "state for %s: %v\n", item.Name(), err)
continue
}
pid := state.BaseState.InitProcessPid
if containerStatus == libcontainer.Stopped {
pid = 0
}
bundle, annotations := utils.Annotations(state.Config.Labels)
s = append(s, containerState{
Version: state.BaseState.Config.Version,
ID: state.BaseState.ID,
InitProcessPid: pid,
Status: containerStatus.String(),
Bundle: bundle,
Rootfs: state.BaseState.Config.Rootfs,
Created: state.BaseState.Created,
Annotations: annotations,
})
}
}
return s, nil
}