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package adapter
import (
"context"
"fmt"
"os"
"github.com/containers/libpod/libpod"
"github.com/docker/docker/pkg/term"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/crypto/ssh/terminal"
"k8s.io/client-go/tools/remotecommand"
)
// ExecAttachCtr execs and attaches to a container
func ExecAttachCtr(ctx context.Context, ctr *libpod.Container, tty, privileged bool, env, cmd []string, user, workDir string, streams *libpod.AttachStreams, preserveFDs int, detachKeys string) (int, error) {
resize := make(chan remotecommand.TerminalSize)
haveTerminal := terminal.IsTerminal(int(os.Stdin.Fd()))
// Check if we are attached to a terminal. If we are, generate resize
// events, and set the terminal to raw mode
if haveTerminal && tty {
cancel, oldTermState, err := handleTerminalAttach(ctx, resize)
if err != nil {
return -1, err
}
defer cancel()
defer restoreTerminal(oldTermState)
}
return ctr.Exec(tty, privileged, env, cmd, user, workDir, streams, preserveFDs, resize, detachKeys)
}
// StartAttachCtr starts and (if required) attaches to a container
// if you change the signature of this function from os.File to io.Writer, it will trigger a downstream
// error. we may need to just lint disable this one.
func StartAttachCtr(ctx context.Context, ctr *libpod.Container, stdout, stderr, stdin *os.File, detachKeys string, sigProxy bool, startContainer bool, recursive bool) error {
resize := make(chan remotecommand.TerminalSize)
haveTerminal := terminal.IsTerminal(int(os.Stdin.Fd()))
// Check if we are attached to a terminal. If we are, generate resize
// events, and set the terminal to raw mode
if haveTerminal && ctr.Spec().Process.Terminal {
cancel, oldTermState, err := handleTerminalAttach(ctx, resize)
if err != nil {
return err
}
defer func() {
if err := restoreTerminal(oldTermState); err != nil {
logrus.Errorf("unable to restore terminal: %q", err)
}
}()
defer cancel()
}
streams := new(libpod.AttachStreams)
streams.OutputStream = stdout
streams.ErrorStream = stderr
streams.InputStream = stdin
streams.AttachOutput = true
streams.AttachError = true
streams.AttachInput = true
if stdout == nil {
logrus.Debugf("Not attaching to stdout")
streams.AttachOutput = false
}
if stderr == nil {
logrus.Debugf("Not attaching to stderr")
streams.AttachError = false
}
if stdin == nil {
logrus.Debugf("Not attaching to stdin")
streams.AttachInput = false
}
if !startContainer {
if sigProxy {
ProxySignals(ctr)
}
return ctr.Attach(streams, detachKeys, resize)
}
attachChan, err := ctr.StartAndAttach(ctx, streams, detachKeys, resize, recursive)
if err != nil {
return err
}
if sigProxy {
ProxySignals(ctr)
}
if stdout == nil && stderr == nil {
fmt.Printf("%s\n", ctr.ID())
}
err = <-attachChan
if err != nil {
return errors.Wrapf(err, "error attaching to container %s", ctr.ID())
}
return nil
}
func handleTerminalAttach(ctx context.Context, resize chan remotecommand.TerminalSize) (context.CancelFunc, *term.State, error) {
logrus.Debugf("Handling terminal attach")
subCtx, cancel := context.WithCancel(ctx)
resizeTty(subCtx, resize)
oldTermState, err := term.SaveState(os.Stdin.Fd())
if err != nil {
// allow caller to not have to do any cleaning up if we error here
cancel()
return nil, nil, errors.Wrapf(err, "unable to save terminal state")
}
logrus.SetFormatter(&RawTtyFormatter{})
if _, err := term.SetRawTerminal(os.Stdin.Fd()); err != nil {
return nil, nil, err
}
return cancel, oldTermState, nil
}
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