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|
package main
import (
"context"
"fmt"
"os"
gosignal "os/signal"
"github.com/containers/libpod/libpod"
"github.com/docker/docker/pkg/signal"
"github.com/docker/docker/pkg/term"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
"golang.org/x/crypto/ssh/terminal"
"k8s.io/client-go/tools/remotecommand"
)
type RawTtyFormatter struct {
}
// Start (if required) and attach to a container
func startAttachCtr(ctr *libpod.Container, stdout, stderr, stdin *os.File, detachKeys string, sigProxy bool, startContainer bool) error {
ctx := context.Background()
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 {
logrus.Debugf("Handling terminal attach")
subCtx, cancel := context.WithCancel(ctx)
defer cancel()
resizeTty(subCtx, resize)
oldTermState, err := term.SaveState(os.Stdin.Fd())
if err != nil {
return errors.Wrapf(err, "unable to save terminal state")
}
logrus.SetFormatter(&RawTtyFormatter{})
term.SetRawTerminal(os.Stdin.Fd())
defer restoreTerminal(oldTermState)
}
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(getContext(), streams, detachKeys, resize)
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
}
// getResize returns a TerminalSize command matching stdin's current
// size on success, and nil on errors.
func getResize() *remotecommand.TerminalSize {
winsize, err := term.GetWinsize(os.Stdin.Fd())
if err != nil {
logrus.Warnf("Could not get terminal size %v", err)
return nil
}
return &remotecommand.TerminalSize{
Width: winsize.Width,
Height: winsize.Height,
}
}
// Helper for prepareAttach - set up a goroutine to generate terminal resize events
func resizeTty(ctx context.Context, resize chan remotecommand.TerminalSize) {
sigchan := make(chan os.Signal, 1)
gosignal.Notify(sigchan, signal.SIGWINCH)
go func() {
defer close(resize)
// Update the terminal size immediately without waiting
// for a SIGWINCH to get the correct initial size.
resizeEvent := getResize()
for {
if resizeEvent == nil {
select {
case <-ctx.Done():
return
case <-sigchan:
resizeEvent = getResize()
}
} else {
select {
case <-ctx.Done():
return
case <-sigchan:
resizeEvent = getResize()
case resize <- *resizeEvent:
resizeEvent = nil
}
}
}
}()
}
func restoreTerminal(state *term.State) error {
logrus.SetFormatter(&logrus.TextFormatter{})
return term.RestoreTerminal(os.Stdin.Fd(), state)
}
func (f *RawTtyFormatter) Format(entry *logrus.Entry) ([]byte, error) {
textFormatter := logrus.TextFormatter{}
bytes, err := textFormatter.Format(entry)
if err == nil {
bytes = append(bytes, '\r')
}
return bytes, err
}
func checkMutuallyExclusiveFlags(c *cli.Context) error {
argLen := len(c.Args())
if (c.Bool("all") || c.Bool("latest")) && argLen > 0 {
return errors.Errorf("no arguments are needed with --all or --latest")
}
if c.Bool("all") && c.Bool("latest") {
return errors.Errorf("--all and --latest cannot be used together")
}
if argLen < 1 && !c.Bool("all") && !c.Bool("latest") {
return errors.Errorf("you must provide at least one pod name or id")
}
if err := validateFlags(c, startFlags); err != nil {
return err
}
return nil
}
// For pod commands that have a latest and all flag, getPodsFromContext gets
// pods the user specifies. If there's an error before getting pods, the pods slice
// will be empty and error will be not nil. If an error occured after, the pod slice
// will hold all of the successful pods, and error will hold the last error.
// The remaining errors will be logged. On success, pods will hold all pods and
// error will be nil.
func getPodsFromContext(c *cli.Context, r *libpod.Runtime) ([]*libpod.Pod, error) {
args := c.Args()
var pods []*libpod.Pod
var lastError error
var err error
if c.Bool("all") {
pods, err = r.Pods()
if err != nil {
return nil, errors.Wrapf(err, "unable to get running pods")
}
}
if c.Bool("latest") {
pod, err := r.GetLatestPod()
if err != nil {
return nil, errors.Wrapf(err, "unable to get latest pod")
}
pods = append(pods, pod)
}
for _, i := range args {
pod, err := r.LookupPod(i)
if err != nil {
if lastError != nil {
logrus.Errorf("%q", lastError)
}
lastError = errors.Wrapf(err, "unable to find pod %s", i)
continue
}
pods = append(pods, pod)
}
return pods, lastError
}
|
