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package main
import (
"os"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/cmd/podman/libpodruntime"
"github.com/containers/libpod/libpod"
"github.com/pkg/errors"
"github.com/spf13/cobra"
)
var (
attachCommand cliconfig.AttachValues
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 = &cobra.Command{
Use: "attach",
Short: "Attach to a running container",
Long: attachDescription,
RunE: func(cmd *cobra.Command, args []string) error {
attachCommand.InputArgs = args
attachCommand.GlobalFlags = MainGlobalOpts
return attachCmd(&attachCommand)
},
Example: `podman attach ctrID
podman attach 1234
podman attach --no-stdin foobar`,
}
)
func init() {
attachCommand.Command = _attachCommand
attachCommand.SetUsageTemplate(UsageTemplate())
flags := attachCommand.Flags()
flags.StringVar(&attachCommand.DetachKeys, "detach-keys", "", "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 _")
flags.BoolVar(&attachCommand.NoStdin, "no-stdin", false, "Do not attach STDIN. The default is false")
flags.BoolVar(&attachCommand.SigProxy, "sig-proxy", true, "Proxy received signals to the process (default true)")
flags.BoolVarP(&attachCommand.Latest, "latest", "l", false, "Act on the latest container podman is aware of")
}
func attachCmd(c *cliconfig.AttachValues) error {
args := c.InputArgs
var ctr *libpod.Container
if len(c.InputArgs) > 1 || (len(c.InputArgs) == 0 && !c.Latest) {
return errors.Errorf("attach requires the name or id of one running container or the latest flag")
}
runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "error creating libpod runtime")
}
defer runtime.Shutdown(false)
if c.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")
}
inputStream := os.Stdin
if c.NoStdin {
inputStream = nil
}
// If the container is in a pod, also set to recursively start dependencies
if err := startAttachCtr(ctr, os.Stdout, os.Stderr, inputStream, c.DetachKeys, c.SigProxy, false, ctr.PodID() != ""); err != nil && errors.Cause(err) != libpod.ErrDetach {
return errors.Wrapf(err, "error attaching to container %s", ctr.ID())
}
return nil
}
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