147 lines
3.4 KiB
Go
147 lines
3.4 KiB
Go
// +build linux
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package main
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import (
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"encoding/json"
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"fmt"
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"os"
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"strconv"
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"strings"
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"github.com/Sirupsen/logrus"
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"github.com/codegangsta/cli"
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"github.com/opencontainers/specs"
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)
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var execCommand = cli.Command{
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Name: "exec",
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Usage: "execute new process inside the container",
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ArgsUsage: `<container-id> <container command>
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Where "<container-id>" is the name for the instance of the container and
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"<container command>" is the command to be executed in the container.
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For example, if the container is configured to run the linux ps command the
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following will output a list of processes running in the container:
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# runc exec <container-id> ps`,
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "console",
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Usage: "specify the pty slave path for use with the container",
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},
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cli.StringFlag{
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Name: "cwd",
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Usage: "current working directory in the container",
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},
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cli.StringSliceFlag{
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Name: "env, e",
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Usage: "set environment variables",
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},
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cli.BoolFlag{
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Name: "tty, t",
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Usage: "allocate a pseudo-TTY",
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},
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cli.StringFlag{
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Name: "user, u",
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Usage: "UID (format: <uid>[:<gid>])",
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},
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cli.StringFlag{
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Name: "process,p",
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Usage: "path to the process.json",
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},
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cli.BoolFlag{
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Name: "detach,d",
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Usage: "detach from the container's process",
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},
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cli.StringFlag{
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Name: "pid-file",
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Value: "",
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Usage: "specify the file to write the process id to",
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},
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},
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Action: func(context *cli.Context) {
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if os.Geteuid() != 0 {
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logrus.Fatal("runc should be run as root")
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}
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status, err := execProcess(context)
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if err != nil {
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logrus.Fatalf("exec failed: %v", err)
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}
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os.Exit(status)
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},
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}
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func execProcess(context *cli.Context) (int, error) {
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container, err := getContainer(context)
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if err != nil {
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return -1, err
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}
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detach := context.Bool("detach")
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state, err := container.State()
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if err != nil {
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return -1, err
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}
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bundle := searchLabels(state.Config.Labels, "bundle")
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p, err := getProcess(context, bundle)
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if err != nil {
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return -1, err
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}
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return runProcess(container, p, nil, context.String("console"), context.String("pid-file"), detach)
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}
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func getProcess(context *cli.Context, bundle string) (*specs.Process, error) {
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if path := context.String("process"); path != "" {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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var p specs.Process
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if err := json.NewDecoder(f).Decode(&p); err != nil {
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return nil, err
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}
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return &p, nil
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}
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// process via cli flags
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if err := os.Chdir(bundle); err != nil {
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return nil, err
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}
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spec, err := loadSpec(specConfig)
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if err != nil {
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return nil, err
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}
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p := spec.Process
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p.Args = context.Args()[1:]
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// override the cwd, if passed
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if context.String("cwd") != "" {
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p.Cwd = context.String("cwd")
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}
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// append the passed env variables
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for _, e := range context.StringSlice("env") {
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p.Env = append(p.Env, e)
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}
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// set the tty
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if context.IsSet("tty") {
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p.Terminal = context.Bool("tty")
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}
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// override the user, if passed
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if context.String("user") != "" {
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u := strings.SplitN(context.String("user"), ":", 2)
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if len(u) > 1 {
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gid, err := strconv.Atoi(u[1])
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if err != nil {
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return nil, fmt.Errorf("parsing %s as int for gid failed: %v", u[1], err)
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}
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p.User.GID = uint32(gid)
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}
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uid, err := strconv.Atoi(u[0])
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if err != nil {
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return nil, fmt.Errorf("parsing %s as int for uid failed: %v", u[0], err)
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}
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p.User.UID = uint32(uid)
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}
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return &p, nil
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}
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