146 lines
3 KiB
Go
146 lines
3 KiB
Go
package main
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import (
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"fmt"
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"os"
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"path/filepath"
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"time"
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gocontext "context"
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"github.com/docker/containerd/api/execution"
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execEvents "github.com/docker/containerd/execution"
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"github.com/docker/docker/pkg/term"
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"github.com/nats-io/go-nats"
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"github.com/urfave/cli"
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)
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var runCommand = cli.Command{
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Name: "run",
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Usage: "run a container",
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Flags: []cli.Flag{
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cli.StringFlag{
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Name: "bundle, b",
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Usage: "path to the container's bundle",
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},
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cli.BoolFlag{
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Name: "tty, t",
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Usage: "allocate a TTY for the container",
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},
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},
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Action: func(context *cli.Context) error {
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id := context.Args().First()
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if id == "" {
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return fmt.Errorf("container id must be provided")
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}
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executionService, err := getExecutionService(context)
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if err != nil {
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return err
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}
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// setup our event subscriber
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nc, err := nats.Connect(nats.DefaultURL)
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if err != nil {
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return err
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}
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nec, err := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
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if err != nil {
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nc.Close()
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return err
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}
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defer nec.Close()
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evCh := make(chan *execEvents.ContainerEvent, 64)
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sub, err := nec.Subscribe(execEvents.ContainersEventsSubjectSubscriber, func(e *execEvents.ContainerEvent) {
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evCh <- e
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})
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if err != nil {
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return err
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}
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defer sub.Unsubscribe()
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tmpDir, err := getTempDir(id)
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if err != nil {
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return err
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}
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defer os.RemoveAll(tmpDir)
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bundle, err := filepath.Abs(context.String("bundle"))
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if err != nil {
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return err
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}
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crOpts := &execution.CreateContainerRequest{
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ID: id,
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BundlePath: bundle,
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Console: context.Bool("tty"),
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Stdin: filepath.Join(tmpDir, "stdin"),
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Stdout: filepath.Join(tmpDir, "stdout"),
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Stderr: filepath.Join(tmpDir, "stderr"),
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}
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var oldState *term.State
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restoreTerm := func() {
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if oldState != nil {
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term.RestoreTerminal(os.Stdin.Fd(), oldState)
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}
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}
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if crOpts.Console {
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oldState, err = term.SetRawTerminal(os.Stdin.Fd())
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if err != nil {
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return err
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}
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defer restoreTerm()
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}
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fwg, err := prepareStdio(crOpts.Stdin, crOpts.Stdout, crOpts.Stderr, crOpts.Console)
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if err != nil {
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return err
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}
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cr, err := executionService.CreateContainer(gocontext.Background(), crOpts)
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if err != nil {
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return err
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}
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if _, err := executionService.StartContainer(gocontext.Background(), &execution.StartContainerRequest{
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ID: cr.Container.ID,
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}); err != nil {
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return err
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}
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var ec uint32
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eventLoop:
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for {
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select {
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case e, more := <-evCh:
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if !more {
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break eventLoop
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}
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if e.ID == cr.Container.ID && e.Pid == cr.InitProcess.Pid {
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ec = e.ExitStatus
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break eventLoop
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}
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case <-time.After(1 * time.Second):
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if nec.Conn.Status() != nats.CONNECTED {
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break eventLoop
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}
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}
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}
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if _, err := executionService.DeleteContainer(gocontext.Background(), &execution.DeleteContainerRequest{
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ID: cr.Container.ID,
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}); err != nil {
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return err
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}
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// Ensure we read all io
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fwg.Wait()
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restoreTerm()
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os.Exit(int(ec))
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return nil
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},
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}
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