136 lines
3 KiB
Go
136 lines
3 KiB
Go
// +build linux
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package main
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import (
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"fmt"
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"io"
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"os"
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"sync"
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"github.com/docker/docker/pkg/term"
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"github.com/opencontainers/runc/libcontainer"
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)
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// newTty creates a new tty for use with the container. If a tty is not to be
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// created for the process, pipes are created so that the TTY of the parent
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// process are not inherited by the container.
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func newTty(create bool, p *libcontainer.Process, rootuid int, console string) (*tty, error) {
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if create {
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return createTty(p, rootuid, console)
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}
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return createStdioPipes(p, rootuid)
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}
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// setup standard pipes so that the TTY of the calling runc process
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// is not inherited by the container.
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func createStdioPipes(p *libcontainer.Process, rootuid int) (*tty, error) {
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i, err := p.InitializeIO(rootuid)
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if err != nil {
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return nil, err
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}
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t := &tty{
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closers: []io.Closer{
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i.Stdin,
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i.Stdout,
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i.Stderr,
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},
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}
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// add the process's io to the post start closers if they support close
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for _, cc := range []interface{}{
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p.Stdin,
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p.Stdout,
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p.Stderr,
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} {
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if c, ok := cc.(io.Closer); ok {
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t.postStart = append(t.postStart, c)
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}
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}
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go func() {
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io.Copy(i.Stdin, os.Stdin)
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i.Stdin.Close()
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}()
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t.wg.Add(2)
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go t.copyIO(os.Stdout, i.Stdout)
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go t.copyIO(os.Stderr, i.Stderr)
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return t, nil
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}
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func (t *tty) copyIO(w io.Writer, r io.ReadCloser) {
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defer t.wg.Done()
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io.Copy(w, r)
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r.Close()
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}
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func createTty(p *libcontainer.Process, rootuid int, consolePath string) (*tty, error) {
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if consolePath != "" {
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if err := p.ConsoleFromPath(consolePath); err != nil {
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return nil, err
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}
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return &tty{}, nil
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}
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console, err := p.NewConsole(rootuid)
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if err != nil {
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return nil, err
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}
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go io.Copy(console, os.Stdin)
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go io.Copy(os.Stdout, console)
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state, err := term.SetRawTerminal(os.Stdin.Fd())
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if err != nil {
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return nil, fmt.Errorf("failed to set the terminal from the stdin: %v", err)
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}
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return &tty{
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console: console,
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state: state,
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closers: []io.Closer{
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console,
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},
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}, nil
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}
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type tty struct {
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console libcontainer.Console
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state *term.State
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closers []io.Closer
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postStart []io.Closer
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wg sync.WaitGroup
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}
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// ClosePostStart closes any fds that are provided to the container and dup2'd
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// so that we no longer have copy in our process.
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func (t *tty) ClosePostStart() error {
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for _, c := range t.postStart {
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c.Close()
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}
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return nil
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}
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// Close closes all open fds for the tty and/or restores the orignal
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// stdin state to what it was prior to the container execution
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func (t *tty) Close() error {
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// ensure that our side of the fds are always closed
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for _, c := range t.postStart {
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c.Close()
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}
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// wait for the copy routines to finish before closing the fds
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t.wg.Wait()
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for _, c := range t.closers {
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c.Close()
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}
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if t.state != nil {
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term.RestoreTerminal(os.Stdin.Fd(), t.state)
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}
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return nil
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}
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func (t *tty) resize() error {
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if t.console == nil {
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return nil
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}
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ws, err := term.GetWinsize(os.Stdin.Fd())
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if err != nil {
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return err
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}
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return term.SetWinsize(t.console.Fd(), ws)
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}
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