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// +build varlink
package varlinkapi
import (
"bufio"
"io"
"github.com/containers/libpod/cmd/podman/varlink"
"github.com/containers/libpod/libpod"
"github.com/containers/libpod/libpod/define"
"github.com/containers/libpod/pkg/varlinkapi/virtwriter"
"github.com/sirupsen/logrus"
"k8s.io/client-go/tools/remotecommand"
)
func setupStreams(call iopodman.VarlinkCall) (*bufio.Reader, *bufio.Writer, *io.PipeReader, *io.PipeWriter, *libpod.AttachStreams) {
// These are the varlink sockets
reader := call.Call.Reader
writer := call.Call.Writer
// This pipe is used to pass stdin from the client to the input stream
// once the msg has been "decoded"
pr, pw := io.Pipe()
stdoutWriter := virtwriter.NewVirtWriteCloser(writer, virtwriter.ToStdout)
// TODO if runc ever starts passing stderr, we can too
//stderrWriter := NewVirtWriteCloser(writer, ToStderr)
streams := libpod.AttachStreams{
OutputStream: stdoutWriter,
InputStream: pr,
// Runc eats the error stream
ErrorStream: stdoutWriter,
AttachInput: true,
AttachOutput: true,
// Runc eats the error stream
AttachError: true,
}
return reader, writer, pr, pw, &streams
}
// Attach connects to a containers console
func (i *LibpodAPI) Attach(call iopodman.VarlinkCall, name string, detachKeys string, start bool) error {
var finalErr error
resize := make(chan remotecommand.TerminalSize)
errChan := make(chan error)
if !call.WantsUpgrade() {
return call.ReplyErrorOccurred("client must use upgraded connection to attach")
}
ctr, err := i.Runtime.LookupContainer(name)
if err != nil {
return call.ReplyErrorOccurred(err.Error())
}
state, err := ctr.State()
if err != nil {
return call.ReplyErrorOccurred(err.Error())
}
if !start && state != define.ContainerStateRunning {
return call.ReplyErrorOccurred("container must be running to attach")
}
// ACK the client upgrade request
call.ReplyAttach()
reader, writer, _, pw, streams := setupStreams(call)
go func() {
if err := virtwriter.Reader(reader, nil, nil, pw, resize); err != nil {
errChan <- err
}
}()
if state == define.ContainerStateRunning {
finalErr = attach(ctr, streams, detachKeys, resize, errChan)
} else {
finalErr = startAndAttach(ctr, streams, detachKeys, resize, errChan)
}
if finalErr != define.ErrDetach && finalErr != nil {
logrus.Error(finalErr)
}
if err = virtwriter.HangUp(writer); err != nil {
logrus.Errorf("Failed to HANG-UP attach to %s: %s", ctr.ID(), err.Error())
}
return call.Writer.Flush()
}
func attach(ctr *libpod.Container, streams *libpod.AttachStreams, detachKeys string, resize chan remotecommand.TerminalSize, errChan chan error) error {
go func() {
if err := ctr.Attach(streams, detachKeys, resize); err != nil {
errChan <- err
}
}()
attachError := <-errChan
return attachError
}
func startAndAttach(ctr *libpod.Container, streams *libpod.AttachStreams, detachKeys string, resize chan remotecommand.TerminalSize, errChan chan error) error {
var finalErr error
attachChan, err := ctr.StartAndAttach(getContext(), streams, detachKeys, resize, false)
if err != nil {
return err
}
select {
case attachChanErr := <-attachChan:
finalErr = attachChanErr
case chanError := <-errChan:
finalErr = chanError
}
return finalErr
}
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