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https://github.com/containers/podman
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5c9694a0c1
Attach to a running container Signed-off-by: baude <bbaude@redhat.com> Closes: #95 Approved by: rhatdan
87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
package main
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import (
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"sync"
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"github.com/pkg/errors"
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"github.com/projectatomic/libpod/libpod"
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"github.com/sirupsen/logrus"
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"github.com/urfave/cli"
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)
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var (
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attachFlags = []cli.Flag{
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cli.StringFlag{
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Name: "detach-keys",
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Usage: "Override the key sequence for detaching a container. Format is a single character [a-Z] or ctrl-<value> where <value> is one of: a-z, @, ^, [, , or _.",
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},
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cli.BoolFlag{
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Name: "no-stdin",
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Usage: "Do not attach STDIN. The default is false.",
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},
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}
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attachDescription = "The kpod attach command allows you to attach to a running container using the container's ID or name, either to view its ongoing output or to control it interactively."
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attachCommand = cli.Command{
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Name: "attach",
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Usage: "Attach to a running container",
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Description: attachDescription,
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Flags: attachFlags,
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Action: attachCmd,
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ArgsUsage: "",
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}
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)
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func attachCmd(c *cli.Context) error {
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args := c.Args()
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if err := validateFlags(c, attachFlags); err != nil {
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return err
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}
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if len(c.Args()) < 1 || len(c.Args()) > 1 {
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return errors.Errorf("attach requires the name or id of one running container")
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}
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runtime, err := getRuntime(c)
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if err != nil {
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return errors.Wrapf(err, "error creating libpod runtime")
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}
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defer runtime.Shutdown(false)
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ctr, err := runtime.LookupContainer(args[0])
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if err != nil {
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return errors.Wrapf(err, "unable to exec into %s", args[0])
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}
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conState, err := ctr.State()
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if err != nil {
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return errors.Wrapf(err, "unable to determine state of %s", args[0])
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}
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if conState != libpod.ContainerStateRunning {
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return errors.Errorf("you can only attach to running containers")
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}
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// Create a bool channel to track that the console socket attach
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// is successful.
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attached := make(chan bool)
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// Create a waitgroup so we can sync and wait for all goroutines
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// to finish before exiting main
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var wg sync.WaitGroup
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// We increment the wg counter because we need to do the attach
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wg.Add(1)
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// Attach to the running container
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go func() {
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logrus.Debug("trying to attach to the container %s", ctr.ID())
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defer wg.Done()
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if err := ctr.Attach(c.Bool("no-stdin"), c.String("detach-keys"), attached); err != nil {
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logrus.Errorf("unable to attach to container %s: %q", ctr.ID(), err)
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}
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}()
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if !<-attached {
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return errors.Errorf("unable to attach to container %s", ctr.ID())
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}
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wg.Wait()
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return nil
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}
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