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124 lines
3.4 KiB
Go
124 lines
3.4 KiB
Go
package container
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import (
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"io"
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"runtime"
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"sync"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/cli/command"
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"github.com/docker/docker/pkg/stdcopy"
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"golang.org/x/net/context"
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)
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// holdHijackedConnection handles copying input to and output from streams to the
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// connection
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func holdHijackedConnection(ctx context.Context, streams command.Streams, tty bool, inputStream io.ReadCloser, outputStream, errorStream io.Writer, resp types.HijackedResponse) error {
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var (
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err error
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restoreOnce sync.Once
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)
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if inputStream != nil && tty {
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if err := setRawTerminal(streams); err != nil {
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return err
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}
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defer func() {
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restoreOnce.Do(func() {
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restoreTerminal(streams, inputStream)
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})
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}()
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}
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receiveStdout := make(chan error, 1)
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if outputStream != nil || errorStream != nil {
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go func() {
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// When TTY is ON, use regular copy
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if tty && outputStream != nil {
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_, err = io.Copy(outputStream, resp.Reader)
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// we should restore the terminal as soon as possible once connection end
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// so any following print messages will be in normal type.
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if inputStream != nil {
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restoreOnce.Do(func() {
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restoreTerminal(streams, inputStream)
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})
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}
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} else {
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_, err = stdcopy.StdCopy(outputStream, errorStream, resp.Reader)
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}
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logrus.Debug("[hijack] End of stdout")
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receiveStdout <- err
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}()
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}
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stdinDone := make(chan struct{})
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go func() {
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if inputStream != nil {
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io.Copy(resp.Conn, inputStream)
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// we should restore the terminal as soon as possible once connection end
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// so any following print messages will be in normal type.
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if tty {
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restoreOnce.Do(func() {
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restoreTerminal(streams, inputStream)
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})
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}
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logrus.Debug("[hijack] End of stdin")
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}
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if err := resp.CloseWrite(); err != nil {
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logrus.Debugf("Couldn't send EOF: %s", err)
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}
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close(stdinDone)
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}()
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select {
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case err := <-receiveStdout:
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if err != nil {
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logrus.Debugf("Error receiveStdout: %s", err)
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return err
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}
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case <-stdinDone:
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if outputStream != nil || errorStream != nil {
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select {
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case err := <-receiveStdout:
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if err != nil {
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logrus.Debugf("Error receiveStdout: %s", err)
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return err
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}
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case <-ctx.Done():
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}
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}
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case <-ctx.Done():
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}
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return nil
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}
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func setRawTerminal(streams command.Streams) error {
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if err := streams.In().SetRawTerminal(); err != nil {
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return err
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}
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return streams.Out().SetRawTerminal()
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}
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func restoreTerminal(streams command.Streams, in io.Closer) error {
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streams.In().RestoreTerminal()
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streams.Out().RestoreTerminal()
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// WARNING: DO NOT REMOVE THE OS CHECKS !!!
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// For some reason this Close call blocks on darwin..
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// As the client exits right after, simply discard the close
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// until we find a better solution.
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//
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// This can also cause the client on Windows to get stuck in Win32 CloseHandle()
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// in some cases. See https://github.com/docker/docker/issues/28267#issuecomment-288237442
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// Tracked internally at Microsoft by VSO #11352156. In the
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// Windows case, you hit this if you are using the native/v2 console,
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// not the "legacy" console, and you start the client in a new window. eg
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// `start docker run --rm -it microsoft/nanoserver cmd /s /c echo foobar`
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// will hang. Remove start, and it won't repro.
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if in != nil && runtime.GOOS != "darwin" && runtime.GOOS != "windows" {
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return in.Close()
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}
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return nil
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}
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