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package main
import (
"os"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/libpod"
"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.",
},
cli.BoolTFlag{
Name: "sig-proxy",
Usage: "proxy received signals to the process (default true)",
},
LatestFlag,
}
attachDescription = "The podman 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()
var ctr *libpod.Container
if err := validateFlags(c, attachFlags); err != nil {
return err
}
if len(c.Args()) > 1 || (len(c.Args()) == 0 && !c.Bool("latest")) {
return errors.Errorf("attach requires the name or id of one running container or the latest flag")
}
runtime, err := getRuntime(c)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
if c.Bool("latest") {
ctr, err = runtime.GetLatestContainer()
} else {
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")
}
if c.BoolT("sig-proxy") {
ProxySignals(ctr)
}
inputStream := os.Stdin
if c.Bool("no-stdin") {
inputStream = nil
}
if err := attachCtr(ctr, os.Stdout, os.Stderr, inputStream, c.String("detach-keys")); err != nil {
return errors.Wrapf(err, "error attaching to container %s", ctr.ID())
}
return nil
}
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