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Merge pull request #29237 from ncdc/fixup-windows-term

Browse Source 
Automatic merge from submit-queue

Fix Windows terminal handling

Fix some issues with Windows terminal handling with respect to TTYs that came up as part of the
code that adds support for terminal resizing.

cc @smarterclayton @sttts @csrwng
This commit is contained in:
k8s-merge-robot 2016-07-21 07:24:13 -07:00 committed by GitHub
commit 1cf3f1cf03
10 changed files with 283 additions and 131 deletions
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7
cmd/hyperkube/kubectl.go
View File

@ -17,15 +17,14 @@ limitations under the License.
package main
import (
"github.com/docker/docker/pkg/term"
"os"
"k8s.io/kubernetes/pkg/kubectl/cmd"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
)
func NewKubectlServer() *Server {
// need to use term.StdStreams to get the right IO refs on Windows
stdin, stdout, stderr := term.StdStreams()
cmd := cmd.NewKubectlCommand(cmdutil.NewFactory(nil), stdin, stdout, stderr)
cmd := cmd.NewKubectlCommand(cmdutil.NewFactory(nil), os.Stdin, os.Stdout, os.Stderr)
localFlags := cmd.LocalFlags()
localFlags.SetInterspersed(false)

6
cmd/kubectl/app/kubectl.go
View File

@ -17,7 +17,7 @@ limitations under the License.
package app
import (
"github.com/docker/docker/pkg/term"
"os"
"k8s.io/kubernetes/pkg/kubectl/cmd"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
@ -28,8 +28,6 @@ WARNING: this logic is duplicated, with minor changes, in cmd/hyperkube/kubectl.
Any salient changes here will need to be manually reflected in that file.
*/
func Run() error {
// need to use term.StdStreams to get the right IO refs on Windows
stdin, stdout, stderr := term.StdStreams()
cmd := cmd.NewKubectlCommand(cmdutil.NewFactory(nil), stdin, stdout, stderr)
cmd := cmd.NewKubectlCommand(cmdutil.NewFactory(nil), os.Stdin, os.Stdout, os.Stderr)
return cmd.Execute()
}

61
pkg/kubectl/cmd/attach.go
View File

@ -32,7 +32,6 @@ import (
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
remotecommandserver "k8s.io/kubernetes/pkg/kubelet/server/remotecommand"
utilerrors "k8s.io/kubernetes/pkg/util/errors"
"k8s.io/kubernetes/pkg/util/interrupt"
"k8s.io/kubernetes/pkg/util/term"
)
@ -51,9 +50,11 @@ var (
func NewCmdAttach(f *cmdutil.Factory, cmdIn io.Reader, cmdOut, cmdErr io.Writer) *cobra.Command {
options := &AttachOptions{
In: cmdIn,
Out: cmdOut,
Err: cmdErr,
StreamOptions: StreamOptions{
In: cmdIn,
Out: cmdOut,
Err: cmdErr,
},
Attach: &DefaultRemoteAttach{},
}
@ -100,19 +101,9 @@ func (*DefaultRemoteAttach) Attach(method string, url *url.URL, config *restclie
// AttachOptions declare the arguments accepted by the Exec command
type AttachOptions struct {
Namespace string
PodName string
ContainerName string
Stdin bool
TTY bool
CommandName string
StreamOptions
// InterruptParent, if set, is used to handle interrupts while attached
InterruptParent *interrupt.Handler
In io.Reader
Out io.Writer
Err io.Writer
CommandName string
Pod *api.Pod
@ -188,38 +179,30 @@ func (p *AttachOptions) Run() error {
}
pod := p.Pod
// ensure we can recover the terminal while attached
t := term.TTY{
Parent: p.InterruptParent,
Out: p.Out,
}
// check for TTY
tty := p.TTY
containerToAttach, err := p.containerToAttachTo(pod)
if err != nil {
return fmt.Errorf("cannot attach to the container: %v", err)
}
if tty && !containerToAttach.TTY {
tty = false
fmt.Fprintf(p.Err, "Unable to use a TTY - container %s did not allocate one\n", containerToAttach.Name)
}
if p.Stdin {
t.In = p.In
if tty && !t.IsTerminalIn() {
tty = false
fmt.Fprintln(p.Err, "Unable to use a TTY - input is not a terminal or the right kind of file")
if p.TTY && !containerToAttach.TTY {
p.TTY = false
if p.Err != nil {
fmt.Fprintf(p.Err, "Unable to use a TTY - container %s did not allocate one\n", containerToAttach.Name)
}
} else {
p.In = nil
} else if !p.TTY && containerToAttach.TTY {
// the container was launched with a TTY, so we have to force a TTY here, otherwise you'll get
// an error "Unrecognized input header"
p.TTY = true
}
t.Raw = tty
// ensure we can recover the terminal while attached
t := p.setupTTY()
// save p.Err so we can print the command prompt message below
stderr := p.Err
var sizeQueue term.TerminalSizeQueue
if tty {
if t.Raw {
if size := t.GetSize(); size != nil {
// fake resizing +1 and then back to normal so that attach-detach-reattach will result in the
// screen being redrawn
@ -252,17 +235,17 @@ func (p *AttachOptions) Run() error {
Stdin: p.Stdin,
Stdout: p.Out != nil,
Stderr: p.Err != nil,
TTY: tty,
TTY: t.Raw,
}, api.ParameterCodec)
return p.Attach.Attach("POST", req.URL(), p.Config, p.In, p.Out, p.Err, tty, sizeQueue)
return p.Attach.Attach("POST", req.URL(), p.Config, p.In, p.Out, p.Err, t.Raw, sizeQueue)
}
if err := t.Safe(fn); err != nil {
return err
}
if p.Stdin && tty && pod.Spec.RestartPolicy == api.RestartPolicyAlways {
if p.Stdin && t.Raw && pod.Spec.RestartPolicy == api.RestartPolicyAlways {
fmt.Fprintf(p.Out, "Session ended, resume using '%s %s -c %s -i -t' command when the pod is running\n", p.CommandName, pod.Name, containerToAttach.Name)
}
return nil

34
pkg/kubectl/cmd/attach_test.go
View File

@ -74,21 +74,21 @@ func TestPodAndContainerAttach(t *testing.T) {
name: "no container, no flags",
},
{
p: &AttachOptions{ContainerName: "bar"},
p: &AttachOptions{StreamOptions: StreamOptions{ContainerName: "bar"}},
args: []string{"foo"},
expectedPod: "foo",
expectedContainer: "bar",
name: "container in flag",
},
{
p: &AttachOptions{ContainerName: "initfoo"},
p: &AttachOptions{StreamOptions: StreamOptions{ContainerName: "initfoo"}},
args: []string{"foo"},
expectedPod: "foo",
expectedContainer: "initfoo",
name: "init container in flag",
},
{
p: &AttachOptions{ContainerName: "bar"},
p: &AttachOptions{StreamOptions: StreamOptions{ContainerName: "bar"}},
args: []string{"foo", "-c", "wrong"},
expectError: true,
name: "non-existing container in flag",
@ -187,11 +187,13 @@ func TestAttach(t *testing.T) {
remoteAttach.err = fmt.Errorf("attach error")
}
params := &AttachOptions{
ContainerName: test.container,
In: bufIn,
Out: bufOut,
Err: bufErr,
Attach: remoteAttach,
StreamOptions: StreamOptions{
ContainerName: test.container,
In: bufIn,
Out: bufOut,
Err: bufErr,
},
Attach: remoteAttach,
}
cmd := &cobra.Command{}
if err := params.Complete(f, cmd, []string{"foo"}); err != nil {
@ -261,13 +263,15 @@ func TestAttachWarnings(t *testing.T) {
bufIn := bytes.NewBuffer([]byte{})
ex := &fakeRemoteAttach{}
params := &AttachOptions{
ContainerName: test.container,
In: bufIn,
Out: bufOut,
Err: bufErr,
Stdin: test.stdin,
TTY: test.tty,
Attach: ex,
StreamOptions: StreamOptions{
ContainerName: test.container,
In: bufIn,
Out: bufOut,
Err: bufErr,
Stdin: test.stdin,
TTY: test.tty,
},
Attach: ex,
}
cmd := &cobra.Command{}
if err := params.Complete(f, cmd, []string{"foo"}); err != nil {

106
pkg/kubectl/cmd/exec.go
View File

@ -21,6 +21,7 @@ import (
"io"
"net/url"
dockerterm "github.com/docker/docker/pkg/term"
"github.com/golang/glog"
"github.com/renstrom/dedent"
"github.com/spf13/cobra"
@ -49,9 +50,11 @@ var (
func NewCmdExec(f *cmdutil.Factory, cmdIn io.Reader, cmdOut, cmdErr io.Writer) *cobra.Command {
options := &ExecOptions{
In: cmdIn,
Out: cmdOut,
Err: cmdErr,
StreamOptions: StreamOptions{
In: cmdIn,
Out: cmdOut,
Err: cmdErr,
},
Executor: &DefaultRemoteExecutor{},
}
@ -98,21 +101,28 @@ func (*DefaultRemoteExecutor) Execute(method string, url *url.URL, config *restc
})
}
// ExecOptions declare the arguments accepted by the Exec command
type ExecOptions struct {
type StreamOptions struct {
Namespace string
PodName string
ContainerName string
Stdin bool
TTY bool
Command []string
// InterruptParent, if set, is used to handle interrupts while attached
InterruptParent *interrupt.Handler
In io.Reader
Out io.Writer
Err io.Writer
In io.Reader
Out io.Writer
Err io.Writer
// for testing
overrideStreams func() (io.ReadCloser, io.Writer, io.Writer)
isTerminalIn func(t term.TTY) bool
}
// ExecOptions declare the arguments accepted by the Exec command
type ExecOptions struct {
StreamOptions
Command []string
Executor RemoteExecutor
Client *client.Client
@ -177,6 +187,58 @@ func (p *ExecOptions) Validate() error {
return nil
}
func (o *StreamOptions) setupTTY() term.TTY {
t := term.TTY{
Parent: o.InterruptParent,
Out: o.Out,
}
if !o.Stdin {
// need to nil out o.In to make sure we don't create a stream for stdin
o.In = nil
o.TTY = false
return t
}
t.In = o.In
if !o.TTY {
return t
}
if o.isTerminalIn == nil {
o.isTerminalIn = func(tty term.TTY) bool {
return tty.IsTerminalIn()
}
}
if !o.isTerminalIn(t) {
o.TTY = false
if o.Err != nil {
fmt.Fprintln(o.Err, "Unable to use a TTY - input is not a terminal or the right kind of file")
}
return t
}
// if we get to here, the user wants to attach stdin, wants a TTY, and o.In is a terminal, so we
// can safely set t.Raw to true
t.Raw = true
if o.overrideStreams == nil {
// use dockerterm.StdStreams() to get the right I/O handles on Windows
o.overrideStreams = dockerterm.StdStreams
}
stdin, stdout, _ := o.overrideStreams()
o.In = stdin
t.In = stdin
if o.Out != nil {
o.Out = stdout
t.Out = stdout
}
return t
}
// Run executes a validated remote execution against a pod.
func (p *ExecOptions) Run() error {
pod, err := p.Client.Pods(p.Namespace).Get(p.PodName)
@ -195,26 +257,10 @@ func (p *ExecOptions) Run() error {
}
// ensure we can recover the terminal while attached
t := term.TTY{
Parent: p.InterruptParent,
Out: p.Out,
}
// check for TTY
tty := p.TTY
if p.Stdin {
t.In = p.In
if tty && !t.IsTerminalIn() {
tty = false
fmt.Fprintln(p.Err, "Unable to use a TTY - input is not a terminal or the right kind of file")
}
} else {
p.In = nil
}
t.Raw = tty
t := p.setupTTY()
var sizeQueue term.TerminalSizeQueue
if tty {
if t.Raw {
// this call spawns a goroutine to monitor/update the terminal size
sizeQueue = t.MonitorSize(t.GetSize())
@ -237,10 +283,10 @@ func (p *ExecOptions) Run() error {
Stdin: p.Stdin,
Stdout: p.Out != nil,
Stderr: p.Err != nil,
TTY: tty,
TTY: t.Raw,
}, api.ParameterCodec)
return p.Executor.Execute("POST", req.URL(), p.Config, p.In, p.Out, p.Err, tty, sizeQueue)
return p.Executor.Execute("POST", req.URL(), p.Config, p.In, p.Out, p.Err, t.Raw, sizeQueue)
}
if err := t.Safe(fn); err != nil {

145
pkg/kubectl/cmd/exec_test.go
View File

@ -20,9 +20,11 @@ import (
"bytes"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"reflect"
"strings"
"testing"
"github.com/spf13/cobra"
@ -65,19 +67,19 @@ func TestPodAndContainer(t *testing.T) {
name: "empty",
},
{
p: &ExecOptions{PodName: "foo"},
p: &ExecOptions{StreamOptions: StreamOptions{PodName: "foo"}},
argsLenAtDash: -1,
expectError: true,
name: "no cmd",
},
{
p: &ExecOptions{PodName: "foo", ContainerName: "bar"},
p: &ExecOptions{StreamOptions: StreamOptions{PodName: "foo", ContainerName: "bar"}},
argsLenAtDash: -1,
expectError: true,
name: "no cmd, w/ container",
},
{
p: &ExecOptions{PodName: "foo"},
p: &ExecOptions{StreamOptions: StreamOptions{PodName: "foo"}},
args: []string{"cmd"},
argsLenAtDash: -1,
expectedPod: "foo",
@ -115,7 +117,7 @@ func TestPodAndContainer(t *testing.T) {
name: "cmd, cmd is behind dash",
},
{
p: &ExecOptions{ContainerName: "bar"},
p: &ExecOptions{StreamOptions: StreamOptions{ContainerName: "bar"}},
args: []string{"foo", "cmd"},
argsLenAtDash: -1,
expectedPod: "foo",
@ -206,12 +208,14 @@ func TestExec(t *testing.T) {
ex.execErr = fmt.Errorf("exec error")
}
params := &ExecOptions{
PodName: "foo",
ContainerName: "bar",
In: bufIn,
Out: bufOut,
Err: bufErr,
Executor: ex,
StreamOptions: StreamOptions{
PodName: "foo",
ContainerName: "bar",
In: bufIn,
Out: bufOut,
Err: bufErr,
},
Executor: ex,
}
cmd := &cobra.Command{}
args := []string{"test", "command"}
@ -257,3 +261,124 @@ func execPod() *api.Pod {
},
}
}
func TestSetupTTY(t *testing.T) {
stderr := &bytes.Buffer{}
// test 1 - don't attach stdin
o := &StreamOptions{
// InterruptParent: ,
Stdin: false,
In: &bytes.Buffer{},
Out: &bytes.Buffer{},
Err: stderr,
TTY: true,
}
tty := o.setupTTY()
if o.In != nil {
t.Errorf("don't attach stdin: o.In should be nil")
}
if tty.In != nil {
t.Errorf("don't attach stdin: tty.In should be nil")
}
if o.TTY {
t.Errorf("don't attach stdin: o.TTY should be false")
}
if tty.Raw {
t.Errorf("don't attach stdin: tty.Raw should be false")
}
if len(stderr.String()) > 0 {
t.Errorf("don't attach stdin: stderr wasn't empty: %s", stderr.String())
}
// tests from here on attach stdin
// test 2 - don't request a TTY
o.Stdin = true
o.In = &bytes.Buffer{}
o.TTY = false
tty = o.setupTTY()
if o.In == nil {
t.Errorf("attach stdin, no TTY: o.In should not be nil")
}
if tty.In != o.In {
t.Errorf("attach stdin, no TTY: tty.In should equal o.In")
}
if o.TTY {
t.Errorf("attach stdin, no TTY: o.TTY should be false")
}
if tty.Raw {
t.Errorf("attach stdin, no TTY: tty.Raw should be false")
}
if len(stderr.String()) > 0 {
t.Errorf("attach stdin, no TTY: stderr wasn't empty: %s", stderr.String())
}
// test 3 - request a TTY, but stdin is not a terminal
o.Stdin = true
o.In = &bytes.Buffer{}
o.Err = stderr
o.TTY = true
tty = o.setupTTY()
if o.In == nil {
t.Errorf("attach stdin, TTY, not a terminal: o.In should not be nil")
}
if tty.In != o.In {
t.Errorf("attach stdin, TTY, not a terminal: tty.In should equal o.In")
}
if o.TTY {
t.Errorf("attach stdin, TTY, not a terminal: o.TTY should be false")
}
if tty.Raw {
t.Errorf("attach stdin, TTY, not a terminal: tty.Raw should be false")
}
if !strings.Contains(stderr.String(), "input is not a terminal") {
t.Errorf("attach stdin, TTY, not a terminal: expected 'input is not a terminal' to stderr")
}
// test 4 - request a TTY, stdin is a terminal
o.Stdin = true
o.In = &bytes.Buffer{}
stderr.Reset()
o.TTY = true
overrideStdin := ioutil.NopCloser(&bytes.Buffer{})
overrideStdout := &bytes.Buffer{}
overrideStderr := &bytes.Buffer{}
o.overrideStreams = func() (io.ReadCloser, io.Writer, io.Writer) {
return overrideStdin, overrideStdout, overrideStderr
}
o.isTerminalIn = func(tty term.TTY) bool {
return true
}
tty = o.setupTTY()
if o.In != overrideStdin {
t.Errorf("attach stdin, TTY, is a terminal: o.In should equal overrideStdin")
}
if tty.In != o.In {
t.Errorf("attach stdin, TTY, is a terminal: tty.In should equal o.In")
}
if !o.TTY {
t.Errorf("attach stdin, TTY, is a terminal: o.TTY should be true")
}
if !tty.Raw {
t.Errorf("attach stdin, TTY, is a terminal: tty.Raw should be true")
}
if len(stderr.String()) > 0 {
t.Errorf("attach stdin, TTY, is a terminal: stderr wasn't empty: %s", stderr.String())
}
if o.Out != overrideStdout {
t.Errorf("attach stdin, TTY, is a terminal: o.Out should equal overrideStdout")
}
if tty.Out != o.Out {
t.Errorf("attach stdin, TTY, is a terminal: tty.Out should equal o.Out")
}
}

12
pkg/kubectl/cmd/run.go
View File

@ -226,11 +226,13 @@ func Run(f *cmdutil.Factory, cmdIn io.Reader, cmdOut, cmdErr io.Writer, cmd *cob
if attach {
opts := &AttachOptions{
In: cmdIn,
Out: cmdOut,
Err: cmdErr,
Stdin: interactive,
TTY: tty,
StreamOptions: StreamOptions{
In: cmdIn,
Out: cmdOut,
Err: cmdErr,
Stdin: interactive,
TTY: tty,
},
CommandName: cmd.Parent().CommandPath() + " attach",

14
pkg/util/term/resize.go
View File

@ -32,10 +32,11 @@ type Size struct {
// GetSize returns the current size of the user's terminal. If it isn't a terminal,
// nil is returned.
func (t TTY) GetSize() *Size {
if !t.IsTerminalOut() {
outFd, isTerminal := term.GetFdInfo(t.Out)
if !isTerminal {
return nil
}
return GetSize(t.Out.(fd).Fd())
return GetSize(outFd)
}
// GetSize returns the current size of the terminal associated with fd.
@ -57,7 +58,8 @@ func SetSize(fd uintptr, size Size) error {
// MonitorSize monitors the terminal's size. It returns a TerminalSizeQueue primed with
// initialSizes, or nil if there's no TTY present.
func (t *TTY) MonitorSize(initialSizes ...*Size) TerminalSizeQueue {
if !t.IsTerminalOut() {
outFd, isTerminal := term.GetFdInfo(t.Out)
if !isTerminal {
return nil
}
@ -69,7 +71,7 @@ func (t *TTY) MonitorSize(initialSizes ...*Size) TerminalSizeQueue {
stopResizing: make(chan struct{}),
}
t.sizeQueue.monitorSize(initialSizes...)
t.sizeQueue.monitorSize(outFd, initialSizes...)
return t.sizeQueue
}
@ -94,7 +96,7 @@ var _ TerminalSizeQueue = &sizeQueue{}
// monitorSize primes resizeChan with initialSizes and then monitors for resize events. With each
// new event, it sends the current terminal size to resizeChan.
func (s *sizeQueue) monitorSize(initialSizes ...*Size) {
func (s *sizeQueue) monitorSize(outFd uintptr, initialSizes ...*Size) {
// send the initial sizes
for i := range initialSizes {
if initialSizes[i] != nil {
@ -104,7 +106,7 @@ func (s *sizeQueue) monitorSize(initialSizes ...*Size) {
resizeEvents := make(chan Size, 1)
monitorResizeEvents(s.t.Out.(fd).Fd(), resizeEvents, s.stopResizing)
monitorResizeEvents(outFd, resizeEvents, s.stopResizing)
// listen for resize events in the background
go func() {

6
pkg/util/term/resizeevents_windows.go
View File

@ -29,7 +29,11 @@ func monitorResizeEvents(fd uintptr, resizeEvents chan<- Size, stop chan struct{
go func() {
defer runtime.HandleCrash()
var lastSize Size
size := GetSize(fd)
if size == nil {
return
}
lastSize := *size
for {
// see if we need to stop running

23
pkg/util/term/term.go
View File

@ -52,11 +52,6 @@ type TTY struct {
sizeQueue *sizeQueue
}
// fd returns a file descriptor for a given object.
type fd interface {
Fd() uintptr
}
// IsTerminalIn returns true if t.In is a terminal. Does not check /dev/tty
// even if TryDev is set.
func (t TTY) IsTerminalIn() bool {
@ -71,8 +66,8 @@ func (t TTY) IsTerminalOut() bool {
// IsTerminal returns whether the passed object is a terminal or not
func IsTerminal(i interface{}) bool {
file, ok := i.(fd)
return ok && term.IsTerminal(file.Fd())
_, terminal := term.GetFdInfo(i)
return terminal
}
// Safe invokes the provided function and will attempt to ensure that when the
@ -82,22 +77,16 @@ func IsTerminal(i interface{}) bool {
// If the input file descriptor is not a TTY and TryDev is true, the /dev/tty file
// will be opened (if available).
func (t TTY) Safe(fn SafeFunc) error {
in := t.In
inFd, isTerminal := term.GetFdInfo(t.In)
var hasFd bool
var inFd uintptr
if desc, ok := in.(fd); ok && in != nil {
inFd = desc.Fd()
hasFd = true
}
if t.TryDev && (!hasFd || !term.IsTerminal(inFd)) {
if !isTerminal && t.TryDev {
if f, err := os.Open("/dev/tty"); err == nil {
defer f.Close()
inFd = f.Fd()
hasFd = true
isTerminal = term.IsTerminal(inFd)
}
}
if !hasFd || !term.IsTerminal(inFd) {
if !isTerminal {
return fn()
}