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package main
import (
"sync"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/libpod"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
var (
attachFlags = []cli.Flag{
cli.StringFlag{
Name: "detach-keys",
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 _.",
},
cli.BoolFlag{
Name: "no-stdin",
Usage: "Do not attach STDIN. The default is false.",
},
}
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."
attachCommand = cli.Command{
Name: "attach",
Usage: "Attach to a running container",
Description: attachDescription,
Flags: attachFlags,
Action: attachCmd,
ArgsUsage: "",
}
)
func attachCmd(c *cli.Context) error {
args := c.Args()
if err := validateFlags(c, attachFlags); err != nil {
return err
}
if len(c.Args()) < 1 || len(c.Args()) > 1 {
return errors.Errorf("attach requires the name or id of one running container")
}
runtime, err := getRuntime(c)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
ctr, err := runtime.LookupContainer(args[0])
if err != nil {
return errors.Wrapf(err, "unable to exec into %s", args[0])
}
conState, err := ctr.State()
if err != nil {
return errors.Wrapf(err, "unable to determine state of %s", args[0])
}
if conState != libpod.ContainerStateRunning {
return errors.Errorf("you can only attach to running containers")
}
// Create a bool channel to track that the console socket attach
// is successful.
attached := make(chan bool)
// Create a waitgroup so we can sync and wait for all goroutines
// to finish before exiting main
var wg sync.WaitGroup
// We increment the wg counter because we need to do the attach
wg.Add(1)
// Attach to the running container
go func() {
logrus.Debug("trying to attach to the container %s", ctr.ID())
defer wg.Done()
if err := ctr.Attach(c.Bool("no-stdin"), c.String("detach-keys"), attached); err != nil {
logrus.Errorf("unable to attach to container %s: %q", ctr.ID(), err)
}
}()
if !<-attached {
return errors.Errorf("unable to attach to container %s", ctr.ID())
}
wg.Wait()
return nil
}
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