vendor files

vendor/k8s.io/utils/.travis.yml

@@ -0,0 +1,9 @@
+language: go
+go:
+  - 1.8.x
+  - 1.9.x
+go_import_path: k8s.io/utils
+script:
+  - diff -u <(echo -n) <(gofmt -d .)
+  - go tool vet .
+  - go test -v -race ./...

vendor/k8s.io/utils/HOWTOMOVE.md

@@ -0,0 +1,31 @@
+# How to move a utility pkg from other kubernetes repos
+
+It has 2 steps to move a pkg from other Kubernetes repos to `k8s.io/utils` repo:
+- copy the pkg to `k8s.io/utils` repo
+- update the import paths and `vendor/` in the repos that refer this pkg
+
+## Copy the pkg to `k8s.io/utils` repo
+
+Copying should preserve all the git history associated with it.
+[Here](http://gbayer.com/development/moving-files-from-one-git-repository-to-another-preserving-history/) is a working approach.
+Note: You may need to use `--allow-unrelated-histories` if you get error when running `git pull` following the post above.
+
+Then, you may need to restructure the package to make sure it has the following structure.
+
+    .
+    ├── doc.go                  # Description for this package
+    ├── <utilname1>.go          # utility go file
+    ├── <utilname>_test.go      # go unit tests
+    └── testing                 # All the testing framework
+        └── fake_<utilname>.go  # Testing framework go file
+
+[#5](https://github.com/kubernetes/utils/pull/5) is an example for this step.
+
+## Update the repos that refer the pkg
+
+You should update the import paths.
+Then follow [this doc](https://github.com/kubernetes/community/blob/master/contributors/devel/godep.md) to update `vendor/` and `Godeps/`.
+
+You may want to run `make bazel-test` to make sure all new references work.
+
+[kubernetes/kubernetes#49234](https://github.com/kubernetes/kubernetes/pull/49234) is an example for this step.

vendor/k8s.io/utils/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
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+
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+   you may not use this file except in compliance with the License.
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+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
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+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/k8s.io/utils/README.md

@@ -0,0 +1,57 @@
+# Utils
+
+[![Build Status]](https://travis-ci.org/kubernetes/utils) [![GoDoc](https://godoc.org/k8s.io/utils?status.svg)](https://godoc.org/k8s.io/utils)
+
+A set of Go libraries that provide low-level,
+kubernetes-independent packages supplementing the [Go
+standard libs].
+
+## Purpose
+
+As Kubernetes grows and spins functionality out of its
+[core] and into cooperating repositories like
+[apiserver], [kubectl], [kubeadm], etc., the need
+arises for leaf repositories to house shared code and
+avoid cycles in repository relationships.
+
+This repository is intended to hold shared utilities
+with no Kubernetes dependence that may be of interest
+to any Go project.  See these [instructions for moving]
+an existing package to this repository.
+
+
+## Criteria for adding code here
+
+- Used by multiple Kubernetes repositories.
+
+- Full unit test coverage.
+
+- Go tools compliant (`go get`, `go test`, etc.).
+
+- Complex enough to be worth vendoring, rather than copying.
+
+- Stable, or backward compatible, API.
+
+- _No dependence on any Kubernetes repository_.
+
+## Libraries
+
+- [Exec](/exec) provides an interface for `os/exec`. It makes it easier
+  to mock and replace in tests, especially with
+  the [FakeExec](exec/testing/fake_exec.go) struct.
+
+- [Temp](/temp) provides an interface to create temporary directories. It also
+  provides a [FakeDir](temp/temptesting) implementation to replace in tests.
+
+- [Clock](/clock) provides an interface for time-based operations.  It allows
+  mocking time for testing.
+
+[Build Status]: https://travis-ci.org/kubernetes/utils.svg?branch=master
+[Go standard libs]: https://golang.org/pkg/#stdlib
+[api]: https://github.com/kubernetes/api
+[apiserver]: https://github.com/kubernetes/apiserver
+[core]: https://github.com/kubernetes/kubernetes
+[ingress]: https://github.com/kubernetes/ingress
+[kubeadm]: https://github.com/kubernetes/kubeadm
+[kubectl]: https://github.com/kubernetes/kubectl
+[instructions for moving]: ./HOWTOMOVE.md

vendor/k8s.io/utils/clock/clock.go

@@ -0,0 +1,94 @@
+/*
+Copyright 2014 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package clock
+
+import "time"
+
+// Clock allows for injecting fake or real clocks into code that
+// needs to do arbitrary things based on time.
+type Clock interface {
+	Now() time.Time
+	Since(time.Time) time.Duration
+	After(d time.Duration) <-chan time.Time
+	NewTimer(d time.Duration) Timer
+	Sleep(d time.Duration)
+	Tick(d time.Duration) <-chan time.Time
+}
+
+var _ = Clock(RealClock{})
+
+// RealClock really calls time.Now()
+type RealClock struct{}
+
+// Now returns the current time.
+func (RealClock) Now() time.Time {
+	return time.Now()
+}
+
+// Since returns time since the specified timestamp.
+func (RealClock) Since(ts time.Time) time.Duration {
+	return time.Since(ts)
+}
+
+// Same as time.After(d).
+func (RealClock) After(d time.Duration) <-chan time.Time {
+	return time.After(d)
+}
+
+func (RealClock) NewTimer(d time.Duration) Timer {
+	return &realTimer{
+		timer: time.NewTimer(d),
+	}
+}
+
+func (RealClock) Tick(d time.Duration) <-chan time.Time {
+	return time.Tick(d)
+}
+
+func (RealClock) Sleep(d time.Duration) {
+	time.Sleep(d)
+}
+
+// Timer allows for injecting fake or real timers into code that
+// needs to do arbitrary things based on time.
+type Timer interface {
+	C() <-chan time.Time
+	Stop() bool
+	Reset(d time.Duration) bool
+}
+
+var _ = Timer(&realTimer{})
+
+// realTimer is backed by an actual time.Timer.
+type realTimer struct {
+	timer *time.Timer
+}
+
+// C returns the underlying timer's channel.
+func (r *realTimer) C() <-chan time.Time {
+	return r.timer.C
+}
+
+// Stop calls Stop() on the underlying timer.
+func (r *realTimer) Stop() bool {
+	return r.timer.Stop()
+}
+
+// Reset calls Reset() on the underlying timer.
+func (r *realTimer) Reset(d time.Duration) bool {
+	return r.timer.Reset(d)
+}

vendor/k8s.io/utils/clock/testing/fake_clock.go

@@ -0,0 +1,254 @@
+/*
+Copyright 2014 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package testing
+
+import (
+	"sync"
+	"time"
+
+	"k8s.io/utils/clock"
+)
+
+var (
+	_ = clock.Clock(&FakeClock{})
+	_ = clock.Clock(&IntervalClock{})
+)
+
+// FakeClock implements clock.Clock, but returns an arbitrary time.
+type FakeClock struct {
+	lock sync.RWMutex
+	time time.Time
+
+	// waiters are waiting for the fake time to pass their specified time
+	waiters []fakeClockWaiter
+}
+
+type fakeClockWaiter struct {
+	targetTime    time.Time
+	stepInterval  time.Duration
+	skipIfBlocked bool
+	destChan      chan time.Time
+	fired         bool
+}
+
+func NewFakeClock(t time.Time) *FakeClock {
+	return &FakeClock{
+		time: t,
+	}
+}
+
+// Now returns f's time.
+func (f *FakeClock) Now() time.Time {
+	f.lock.RLock()
+	defer f.lock.RUnlock()
+	return f.time
+}
+
+// Since returns time since the time in f.
+func (f *FakeClock) Since(ts time.Time) time.Duration {
+	f.lock.RLock()
+	defer f.lock.RUnlock()
+	return f.time.Sub(ts)
+}
+
+// Fake version of time.After(d).
+func (f *FakeClock) After(d time.Duration) <-chan time.Time {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+	stopTime := f.time.Add(d)
+	ch := make(chan time.Time, 1) // Don't block!
+	f.waiters = append(f.waiters, fakeClockWaiter{
+		targetTime: stopTime,
+		destChan:   ch,
+	})
+	return ch
+}
+
+// Fake version of time.NewTimer(d).
+func (f *FakeClock) NewTimer(d time.Duration) clock.Timer {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+	stopTime := f.time.Add(d)
+	ch := make(chan time.Time, 1) // Don't block!
+	timer := &fakeTimer{
+		fakeClock: f,
+		waiter: fakeClockWaiter{
+			targetTime: stopTime,
+			destChan:   ch,
+		},
+	}
+	f.waiters = append(f.waiters, timer.waiter)
+	return timer
+}
+
+func (f *FakeClock) Tick(d time.Duration) <-chan time.Time {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+	tickTime := f.time.Add(d)
+	ch := make(chan time.Time, 1) // hold one tick
+	f.waiters = append(f.waiters, fakeClockWaiter{
+		targetTime:    tickTime,
+		stepInterval:  d,
+		skipIfBlocked: true,
+		destChan:      ch,
+	})
+
+	return ch
+}
+
+// Move clock by Duration, notify anyone that's called After, Tick, or NewTimer
+func (f *FakeClock) Step(d time.Duration) {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+	f.setTimeLocked(f.time.Add(d))
+}
+
+// Sets the time.
+func (f *FakeClock) SetTime(t time.Time) {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+	f.setTimeLocked(t)
+}
+
+// Actually changes the time and checks any waiters. f must be write-locked.
+func (f *FakeClock) setTimeLocked(t time.Time) {
+	f.time = t
+	newWaiters := make([]fakeClockWaiter, 0, len(f.waiters))
+	for i := range f.waiters {
+		w := &f.waiters[i]
+		if !w.targetTime.After(t) {
+
+			if w.skipIfBlocked {
+				select {
+				case w.destChan <- t:
+					w.fired = true
+				default:
+				}
+			} else {
+				w.destChan <- t
+				w.fired = true
+			}
+
+			if w.stepInterval > 0 {
+				for !w.targetTime.After(t) {
+					w.targetTime = w.targetTime.Add(w.stepInterval)
+				}
+				newWaiters = append(newWaiters, *w)
+			}
+
+		} else {
+			newWaiters = append(newWaiters, f.waiters[i])
+		}
+	}
+	f.waiters = newWaiters
+}
+
+// Returns true if After has been called on f but not yet satisfied (so you can
+// write race-free tests).
+func (f *FakeClock) HasWaiters() bool {
+	f.lock.RLock()
+	defer f.lock.RUnlock()
+	return len(f.waiters) > 0
+}
+
+func (f *FakeClock) Sleep(d time.Duration) {
+	f.Step(d)
+}
+
+// IntervalClock implements clock.Clock, but each invocation of Now steps the clock forward the specified duration
+type IntervalClock struct {
+	Time     time.Time
+	Duration time.Duration
+}
+
+// Now returns i's time.
+func (i *IntervalClock) Now() time.Time {
+	i.Time = i.Time.Add(i.Duration)
+	return i.Time
+}
+
+// Since returns time since the time in i.
+func (i *IntervalClock) Since(ts time.Time) time.Duration {
+	return i.Time.Sub(ts)
+}
+
+// Unimplemented, will panic.
+// TODO: make interval clock use FakeClock so this can be implemented.
+func (*IntervalClock) After(d time.Duration) <-chan time.Time {
+	panic("IntervalClock doesn't implement After")
+}
+
+// Unimplemented, will panic.
+// TODO: make interval clock use FakeClock so this can be implemented.
+func (*IntervalClock) NewTimer(d time.Duration) clock.Timer {
+	panic("IntervalClock doesn't implement NewTimer")
+}
+
+// Unimplemented, will panic.
+// TODO: make interval clock use FakeClock so this can be implemented.
+func (*IntervalClock) Tick(d time.Duration) <-chan time.Time {
+	panic("IntervalClock doesn't implement Tick")
+}
+
+func (*IntervalClock) Sleep(d time.Duration) {
+	panic("IntervalClock doesn't implement Sleep")
+}
+
+var _ = clock.Timer(&fakeTimer{})
+
+// fakeTimer implements clock.Timer based on a FakeClock.
+type fakeTimer struct {
+	fakeClock *FakeClock
+	waiter    fakeClockWaiter
+}
+
+// C returns the channel that notifies when this timer has fired.
+func (f *fakeTimer) C() <-chan time.Time {
+	return f.waiter.destChan
+}
+
+// Stop stops the timer and returns true if the timer has not yet fired, or false otherwise.
+func (f *fakeTimer) Stop() bool {
+	f.fakeClock.lock.Lock()
+	defer f.fakeClock.lock.Unlock()
+
+	newWaiters := make([]fakeClockWaiter, 0, len(f.fakeClock.waiters))
+	for i := range f.fakeClock.waiters {
+		w := &f.fakeClock.waiters[i]
+		if w != &f.waiter {
+			newWaiters = append(newWaiters, *w)
+		}
+	}
+
+	f.fakeClock.waiters = newWaiters
+
+	return !f.waiter.fired
+}
+
+// Reset resets the timer to the fake clock's "now" + d. It returns true if the timer has not yet
+// fired, or false otherwise.
+func (f *fakeTimer) Reset(d time.Duration) bool {
+	f.fakeClock.lock.Lock()
+	defer f.fakeClock.lock.Unlock()
+
+	active := !f.waiter.fired
+
+	f.waiter.fired = false
+	f.waiter.targetTime = f.fakeClock.time.Add(d)
+
+	return active
+}

vendor/k8s.io/utils/clock/testing/fake_clock_test.go

@@ -0,0 +1,184 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package testing
+
+import (
+	"testing"
+	"time"
+)
+
+func TestFakeClock(t *testing.T) {
+	startTime := time.Now()
+	tc := NewFakeClock(startTime)
+	tc.Step(time.Second)
+	now := tc.Now()
+	if now.Sub(startTime) != time.Second {
+		t.Errorf("input: %s now=%s gap=%s expected=%s", startTime, now, now.Sub(startTime), time.Second)
+	}
+
+	tt := tc.Now()
+	tc.SetTime(tt.Add(time.Hour))
+	if tc.Now().Sub(tt) != time.Hour {
+		t.Errorf("input: %s now=%s gap=%s expected=%s", tt, tc.Now(), tc.Now().Sub(tt), time.Hour)
+	}
+}
+
+func TestFakeClockSleep(t *testing.T) {
+	startTime := time.Now()
+	tc := NewFakeClock(startTime)
+	tc.Sleep(time.Duration(1) * time.Hour)
+	now := tc.Now()
+	if now.Sub(startTime) != time.Hour {
+		t.Errorf("Fake sleep failed, expected time to advance by one hour, instead, its %v", now.Sub(startTime))
+	}
+}
+
+func TestFakeAfter(t *testing.T) {
+	tc := NewFakeClock(time.Now())
+	if tc.HasWaiters() {
+		t.Errorf("unexpected waiter?")
+	}
+	oneSec := tc.After(time.Second)
+	if !tc.HasWaiters() {
+		t.Errorf("unexpected lack of waiter?")
+	}
+
+	oneOhOneSec := tc.After(time.Second + time.Millisecond)
+	twoSec := tc.After(2 * time.Second)
+	select {
+	case <-oneSec:
+		t.Errorf("unexpected channel read")
+	case <-oneOhOneSec:
+		t.Errorf("unexpected channel read")
+	case <-twoSec:
+		t.Errorf("unexpected channel read")
+	default:
+	}
+
+	tc.Step(999 * time.Millisecond)
+	select {
+	case <-oneSec:
+		t.Errorf("unexpected channel read")
+	case <-oneOhOneSec:
+		t.Errorf("unexpected channel read")
+	case <-twoSec:
+		t.Errorf("unexpected channel read")
+	default:
+	}
+
+	tc.Step(time.Millisecond)
+	select {
+	case <-oneSec:
+		// Expected!
+	case <-oneOhOneSec:
+		t.Errorf("unexpected channel read")
+	case <-twoSec:
+		t.Errorf("unexpected channel read")
+	default:
+		t.Errorf("unexpected non-channel read")
+	}
+	tc.Step(time.Millisecond)
+	select {
+	case <-oneSec:
+		// should not double-trigger!
+		t.Errorf("unexpected channel read")
+	case <-oneOhOneSec:
+		// Expected!
+	case <-twoSec:
+		t.Errorf("unexpected channel read")
+	default:
+		t.Errorf("unexpected non-channel read")
+	}
+}
+
+func TestFakeTick(t *testing.T) {
+	tc := NewFakeClock(time.Now())
+	if tc.HasWaiters() {
+		t.Errorf("unexpected waiter?")
+	}
+	oneSec := tc.Tick(time.Second)
+	if !tc.HasWaiters() {
+		t.Errorf("unexpected lack of waiter?")
+	}
+
+	oneOhOneSec := tc.Tick(time.Second + time.Millisecond)
+	twoSec := tc.Tick(2 * time.Second)
+	select {
+	case <-oneSec:
+		t.Errorf("unexpected channel read")
+	case <-oneOhOneSec:
+		t.Errorf("unexpected channel read")
+	case <-twoSec:
+		t.Errorf("unexpected channel read")
+	default:
+	}
+
+	tc.Step(999 * time.Millisecond) // t=.999
+	select {
+	case <-oneSec:
+		t.Errorf("unexpected channel read")
+	case <-oneOhOneSec:
+		t.Errorf("unexpected channel read")
+	case <-twoSec:
+		t.Errorf("unexpected channel read")
+	default:
+	}
+
+	tc.Step(time.Millisecond) // t=1.000
+	select {
+	case <-oneSec:
+		// Expected!
+	case <-oneOhOneSec:
+		t.Errorf("unexpected channel read")
+	case <-twoSec:
+		t.Errorf("unexpected channel read")
+	default:
+		t.Errorf("unexpected non-channel read")
+	}
+	tc.Step(time.Millisecond) // t=1.001
+	select {
+	case <-oneSec:
+		// should not double-trigger!
+		t.Errorf("unexpected channel read")
+	case <-oneOhOneSec:
+		// Expected!
+	case <-twoSec:
+		t.Errorf("unexpected channel read")
+	default:
+		t.Errorf("unexpected non-channel read")
+	}
+
+	tc.Step(time.Second) // t=2.001
+	tc.Step(time.Second) // t=3.001
+	tc.Step(time.Second) // t=4.001
+	tc.Step(time.Second) // t=5.001
+
+	// The one second ticker should not accumulate ticks
+	accumulatedTicks := 0
+	drained := false
+	for !drained {
+		select {
+		case <-oneSec:
+			accumulatedTicks++
+		default:
+			drained = true
+		}
+	}
+	if accumulatedTicks != 1 {
+		t.Errorf("unexpected number of accumulated ticks: %d", accumulatedTicks)
+	}
+}

vendor/k8s.io/utils/code-of-conduct.md

@@ -0,0 +1,3 @@
+# Kubernetes Community Code of Conduct
+
+Please refer to our [Kubernetes Community Code of Conduct](https://git.k8s.io/community/code-of-conduct.md)

vendor/k8s.io/utils/exec/doc.go

@@ -0,0 +1,18 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package exec provides an injectable interface and implementations for running commands.
+package exec // import "k8s.io/utils/exec"

vendor/k8s.io/utils/exec/exec.go

@@ -0,0 +1,215 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package exec
+
+import (
+	"context"
+	"io"
+	osexec "os/exec"
+	"syscall"
+	"time"
+)
+
+// ErrExecutableNotFound is returned if the executable is not found.
+var ErrExecutableNotFound = osexec.ErrNotFound
+
+// Interface is an interface that presents a subset of the os/exec API. Use this
+// when you want to inject fakeable/mockable exec behavior.
+type Interface interface {
+	// Command returns a Cmd instance which can be used to run a single command.
+	// This follows the pattern of package os/exec.
+	Command(cmd string, args ...string) Cmd
+
+	// CommandContext returns a Cmd instance which can be used to run a single command.
+	//
+	// The provided context is used to kill the process if the context becomes done
+	// before the command completes on its own. For example, a timeout can be set in
+	// the context.
+	CommandContext(ctx context.Context, cmd string, args ...string) Cmd
+
+	// LookPath wraps os/exec.LookPath
+	LookPath(file string) (string, error)
+}
+
+// Cmd is an interface that presents an API that is very similar to Cmd from os/exec.
+// As more functionality is needed, this can grow. Since Cmd is a struct, we will have
+// to replace fields with get/set method pairs.
+type Cmd interface {
+	// Run runs the command to the completion.
+	Run() error
+	// CombinedOutput runs the command and returns its combined standard output
+	// and standard error. This follows the pattern of package os/exec.
+	CombinedOutput() ([]byte, error)
+	// Output runs the command and returns standard output, but not standard err
+	Output() ([]byte, error)
+	SetDir(dir string)
+	SetStdin(in io.Reader)
+	SetStdout(out io.Writer)
+	SetStderr(out io.Writer)
+	// Stops the command by sending SIGTERM. It is not guaranteed the
+	// process will stop before this function returns. If the process is not
+	// responding, an internal timer function will send a SIGKILL to force
+	// terminate after 10 seconds.
+	Stop()
+}
+
+// ExitError is an interface that presents an API similar to os.ProcessState, which is
+// what ExitError from os/exec is. This is designed to make testing a bit easier and
+// probably loses some of the cross-platform properties of the underlying library.
+type ExitError interface {
+	String() string
+	Error() string
+	Exited() bool
+	ExitStatus() int
+}
+
+// Implements Interface in terms of really exec()ing.
+type executor struct{}
+
+// New returns a new Interface which will os/exec to run commands.
+func New() Interface {
+	return &executor{}
+}
+
+// Command is part of the Interface interface.
+func (executor *executor) Command(cmd string, args ...string) Cmd {
+	return (*cmdWrapper)(osexec.Command(cmd, args...))
+}
+
+// CommandContext is part of the Interface interface.
+func (executor *executor) CommandContext(ctx context.Context, cmd string, args ...string) Cmd {
+	return (*cmdWrapper)(osexec.CommandContext(ctx, cmd, args...))
+}
+
+// LookPath is part of the Interface interface
+func (executor *executor) LookPath(file string) (string, error) {
+	return osexec.LookPath(file)
+}
+
+// Wraps exec.Cmd so we can capture errors.
+type cmdWrapper osexec.Cmd
+
+var _ Cmd = &cmdWrapper{}
+
+func (cmd *cmdWrapper) SetDir(dir string) {
+	cmd.Dir = dir
+}
+
+func (cmd *cmdWrapper) SetStdin(in io.Reader) {
+	cmd.Stdin = in
+}
+
+func (cmd *cmdWrapper) SetStdout(out io.Writer) {
+	cmd.Stdout = out
+}
+
+func (cmd *cmdWrapper) SetStderr(out io.Writer) {
+	cmd.Stderr = out
+}
+
+// Run is part of the Cmd interface.
+func (cmd *cmdWrapper) Run() error {
+	err := (*osexec.Cmd)(cmd).Run()
+	return handleError(err)
+}
+
+// CombinedOutput is part of the Cmd interface.
+func (cmd *cmdWrapper) CombinedOutput() ([]byte, error) {
+	out, err := (*osexec.Cmd)(cmd).CombinedOutput()
+	return out, handleError(err)
+}
+
+func (cmd *cmdWrapper) Output() ([]byte, error) {
+	out, err := (*osexec.Cmd)(cmd).Output()
+	return out, handleError(err)
+}
+
+// Stop is part of the Cmd interface.
+func (cmd *cmdWrapper) Stop() {
+	c := (*osexec.Cmd)(cmd)
+
+	if c.Process == nil {
+		return
+	}
+
+	c.Process.Signal(syscall.SIGTERM)
+
+	time.AfterFunc(10*time.Second, func() {
+		if !c.ProcessState.Exited() {
+			c.Process.Signal(syscall.SIGKILL)
+		}
+	})
+}
+
+func handleError(err error) error {
+	if err == nil {
+		return nil
+	}
+
+	switch e := err.(type) {
+	case *osexec.ExitError:
+		return &ExitErrorWrapper{e}
+	case *osexec.Error:
+		if e.Err == osexec.ErrNotFound {
+			return ErrExecutableNotFound
+		}
+	}
+
+	return err
+}
+
+// ExitErrorWrapper is an implementation of ExitError in terms of os/exec ExitError.
+// Note: standard exec.ExitError is type *os.ProcessState, which already implements Exited().
+type ExitErrorWrapper struct {
+	*osexec.ExitError
+}
+
+var _ ExitError = &ExitErrorWrapper{}
+
+// ExitStatus is part of the ExitError interface.
+func (eew ExitErrorWrapper) ExitStatus() int {
+	ws, ok := eew.Sys().(syscall.WaitStatus)
+	if !ok {
+		panic("can't call ExitStatus() on a non-WaitStatus exitErrorWrapper")
+	}
+	return ws.ExitStatus()
+}
+
+// CodeExitError is an implementation of ExitError consisting of an error object
+// and an exit code (the upper bits of os.exec.ExitStatus).
+type CodeExitError struct {
+	Err  error
+	Code int
+}
+
+var _ ExitError = CodeExitError{}
+
+func (e CodeExitError) Error() string {
+	return e.Err.Error()
+}
+
+func (e CodeExitError) String() string {
+	return e.Err.Error()
+}
+
+func (e CodeExitError) Exited() bool {
+	return true
+}
+
+func (e CodeExitError) ExitStatus() int {
+	return e.Code
+}

vendor/k8s.io/utils/exec/exec_test.go

@@ -0,0 +1,141 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package exec
+
+import (
+	"context"
+	osexec "os/exec"
+	"testing"
+	"time"
+)
+
+func TestExecutorNoArgs(t *testing.T) {
+	ex := New()
+
+	cmd := ex.Command("true")
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Errorf("expected success, got %v", err)
+	}
+	if len(out) != 0 {
+		t.Errorf("expected no output, got %q", string(out))
+	}
+
+	cmd = ex.Command("false")
+	out, err = cmd.CombinedOutput()
+	if err == nil {
+		t.Errorf("expected failure, got nil error")
+	}
+	if len(out) != 0 {
+		t.Errorf("expected no output, got %q", string(out))
+	}
+	ee, ok := err.(ExitError)
+	if !ok {
+		t.Errorf("expected an ExitError, got %+v", err)
+	}
+	if ee.Exited() {
+		if code := ee.ExitStatus(); code != 1 {
+			t.Errorf("expected exit status 1, got %d", code)
+		}
+	}
+
+	cmd = ex.Command("/does/not/exist")
+	out, err = cmd.CombinedOutput()
+	if err == nil {
+		t.Errorf("expected failure, got nil error")
+	}
+	if ee, ok := err.(ExitError); ok {
+		t.Errorf("expected non-ExitError, got %+v", ee)
+	}
+}
+
+func TestExecutorWithArgs(t *testing.T) {
+	ex := New()
+
+	cmd := ex.Command("echo", "stdout")
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Errorf("expected success, got %+v", err)
+	}
+	if string(out) != "stdout\n" {
+		t.Errorf("unexpected output: %q", string(out))
+	}
+
+	cmd = ex.Command("/bin/sh", "-c", "echo stderr > /dev/stderr")
+	out, err = cmd.CombinedOutput()
+	if err != nil {
+		t.Errorf("expected success, got %+v", err)
+	}
+	if string(out) != "stderr\n" {
+		t.Errorf("unexpected output: %q", string(out))
+	}
+}
+
+func TestLookPath(t *testing.T) {
+	ex := New()
+
+	shExpected, _ := osexec.LookPath("sh")
+	sh, _ := ex.LookPath("sh")
+	if sh != shExpected {
+		t.Errorf("unexpected result for LookPath: got %s, expected %s", sh, shExpected)
+	}
+}
+
+func TestExecutableNotFound(t *testing.T) {
+	exec := New()
+
+	cmd := exec.Command("fake_executable_name")
+	_, err := cmd.CombinedOutput()
+	if err != ErrExecutableNotFound {
+		t.Errorf("cmd.CombinedOutput(): Expected error ErrExecutableNotFound but got %v", err)
+	}
+
+	cmd = exec.Command("fake_executable_name")
+	_, err = cmd.Output()
+	if err != ErrExecutableNotFound {
+		t.Errorf("cmd.Output(): Expected error ErrExecutableNotFound but got %v", err)
+	}
+
+	cmd = exec.Command("fake_executable_name")
+	err = cmd.Run()
+	if err != ErrExecutableNotFound {
+		t.Errorf("cmd.Run(): Expected error ErrExecutableNotFound but got %v", err)
+	}
+}
+
+func TestStopBeforeStart(t *testing.T) {
+	cmd := New().Command("echo", "hello")
+
+	// no panic calling Stop before calling Run
+	cmd.Stop()
+
+	cmd.Run()
+
+	// no panic calling Stop after command is done
+	cmd.Stop()
+}
+
+func TestTimeout(t *testing.T) {
+	exec := New()
+	ctx, cancel := context.WithTimeout(context.Background(), time.Nanosecond)
+	defer cancel()
+
+	err := exec.CommandContext(ctx, "sleep", "2").Run()
+	if err != context.DeadlineExceeded {
+		t.Errorf("expected %v but got %v", context.DeadlineExceeded, err)
+	}
+}

vendor/k8s.io/utils/exec/new_test.go

@@ -0,0 +1,37 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package exec_test
+
+import (
+	"bytes"
+	"fmt"
+
+	"k8s.io/utils/exec"
+)
+
+func ExampleNew() {
+	exec := exec.New()
+
+	cmd := exec.Command("echo", "Bonjour!")
+	buff := bytes.Buffer{}
+	cmd.SetStdout(&buff)
+	if err := cmd.Run(); err != nil {
+		panic(err)
+	}
+	fmt.Println(buff.String())
+	// Output: Bonjour!
+}

vendor/k8s.io/utils/exec/testing/fake_exec.go

@@ -0,0 +1,158 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package testingexec
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"k8s.io/utils/exec"
+)
+
+// A simple scripted Interface type.
+type FakeExec struct {
+	CommandScript []FakeCommandAction
+	CommandCalls  int
+	LookPathFunc  func(string) (string, error)
+}
+
+var _ exec.Interface = &FakeExec{}
+
+type FakeCommandAction func(cmd string, args ...string) exec.Cmd
+
+func (fake *FakeExec) Command(cmd string, args ...string) exec.Cmd {
+	if fake.CommandCalls > len(fake.CommandScript)-1 {
+		panic(fmt.Sprintf("ran out of Command() actions. Could not handle command [%d]: %s args: %v", fake.CommandCalls, cmd, args))
+	}
+	i := fake.CommandCalls
+	fake.CommandCalls++
+	return fake.CommandScript[i](cmd, args...)
+}
+
+func (fake *FakeExec) CommandContext(ctx context.Context, cmd string, args ...string) exec.Cmd {
+	return fake.Command(cmd, args...)
+}
+
+func (fake *FakeExec) LookPath(file string) (string, error) {
+	return fake.LookPathFunc(file)
+}
+
+// A simple scripted Cmd type.
+type FakeCmd struct {
+	Argv                 []string
+	CombinedOutputScript []FakeCombinedOutputAction
+	CombinedOutputCalls  int
+	CombinedOutputLog    [][]string
+	RunScript            []FakeRunAction
+	RunCalls             int
+	RunLog               [][]string
+	Dirs                 []string
+	Stdin                io.Reader
+	Stdout               io.Writer
+	Stderr               io.Writer
+}
+
+var _ exec.Cmd = &FakeCmd{}
+
+func InitFakeCmd(fake *FakeCmd, cmd string, args ...string) exec.Cmd {
+	fake.Argv = append([]string{cmd}, args...)
+	return fake
+}
+
+type FakeCombinedOutputAction func() ([]byte, error)
+type FakeRunAction func() ([]byte, []byte, error)
+
+func (fake *FakeCmd) SetDir(dir string) {
+	fake.Dirs = append(fake.Dirs, dir)
+}
+
+func (fake *FakeCmd) SetStdin(in io.Reader) {
+	fake.Stdin = in
+}
+
+func (fake *FakeCmd) SetStdout(out io.Writer) {
+	fake.Stdout = out
+}
+
+func (fake *FakeCmd) SetStderr(out io.Writer) {
+	fake.Stderr = out
+}
+
+func (fake *FakeCmd) Run() error {
+	if fake.RunCalls > len(fake.RunScript)-1 {
+		panic("ran out of Run() actions")
+	}
+	if fake.RunLog == nil {
+		fake.RunLog = [][]string{}
+	}
+	i := fake.RunCalls
+	fake.RunLog = append(fake.RunLog, append([]string{}, fake.Argv...))
+	fake.RunCalls++
+	stdout, stderr, err := fake.RunScript[i]()
+	if stdout != nil {
+		fake.Stdout.Write(stdout)
+	}
+	if stderr != nil {
+		fake.Stderr.Write(stderr)
+	}
+	return err
+}
+
+func (fake *FakeCmd) CombinedOutput() ([]byte, error) {
+	if fake.CombinedOutputCalls > len(fake.CombinedOutputScript)-1 {
+		panic("ran out of CombinedOutput() actions")
+	}
+	if fake.CombinedOutputLog == nil {
+		fake.CombinedOutputLog = [][]string{}
+	}
+	i := fake.CombinedOutputCalls
+	fake.CombinedOutputLog = append(fake.CombinedOutputLog, append([]string{}, fake.Argv...))
+	fake.CombinedOutputCalls++
+	return fake.CombinedOutputScript[i]()
+}
+
+func (fake *FakeCmd) Output() ([]byte, error) {
+	return nil, fmt.Errorf("unimplemented")
+}
+
+func (fake *FakeCmd) Stop() {
+	// no-op
+}
+
+// A simple fake ExitError type.
+type FakeExitError struct {
+	Status int
+}
+
+var _ exec.ExitError = FakeExitError{}
+
+func (fake FakeExitError) String() string {
+	return fmt.Sprintf("exit %d", fake.Status)
+}
+
+func (fake FakeExitError) Error() string {
+	return fake.String()
+}
+
+func (fake FakeExitError) Exited() bool {
+	return true
+}
+
+func (fake FakeExitError) ExitStatus() int {
+	return fake.Status
+}

vendor/k8s.io/utils/temp/dir.go

@@ -0,0 +1,70 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package temp
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+// Directory is an interface to a temporary directory, in which you can
+// create new files.
+type Directory interface {
+	// NewFile creates a new file in that directory. Calling NewFile
+	// with the same filename twice will result in an error.
+	NewFile(name string) (io.WriteCloser, error)
+	// Delete removes the directory and its content.
+	Delete() error
+}
+
+// TempDir is wrapping an temporary directory on disk.
+type TempDir struct {
+	// Name is the name (full path) of the created directory.
+	Name string
+}
+
+var _ Directory = &TempDir{}
+
+// CreateTempDir returns a new Directory wrapping a temporary directory
+// on disk.
+func CreateTempDir(prefix string) (*TempDir, error) {
+	name, err := ioutil.TempDir("", fmt.Sprintf("%s-", prefix))
+	if err != nil {
+		return nil, err
+	}
+
+	return &TempDir{
+		Name: name,
+	}, nil
+}
+
+// NewFile creates a new file in the specified directory.
+func (d *TempDir) NewFile(name string) (io.WriteCloser, error) {
+	return os.OpenFile(
+		filepath.Join(d.Name, name),
+		os.O_WRONLY|os.O_CREATE|os.O_TRUNC|os.O_EXCL,
+		0700,
+	)
+}
+
+// Delete the underlying directory, and all of its content.
+func (d *TempDir) Delete() error {
+	return os.RemoveAll(d.Name)
+}

vendor/k8s.io/utils/temp/dir_test.go

@@ -0,0 +1,90 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package temp
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestTempDir(t *testing.T) {
+	dir, err := CreateTempDir("prefix")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Delete the directory no matter what.
+	defer dir.Delete()
+
+	// Make sure we have created the dir, with the proper name
+	_, err = os.Stat(dir.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.HasPrefix(filepath.Base(dir.Name), "prefix") {
+		t.Fatalf(`Directory doesn't start with "prefix": %q`,
+			dir.Name)
+	}
+
+	// Verify that the directory is empty
+	entries, err := ioutil.ReadDir(dir.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(entries) != 0 {
+		t.Fatalf("Directory should be empty, has %d elements",
+			len(entries))
+	}
+
+	// Create a couple of files
+	_, err = dir.NewFile("ONE")
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = dir.NewFile("TWO")
+	if err != nil {
+		t.Fatal(err)
+	}
+	// We can't create the same file twice
+	_, err = dir.NewFile("TWO")
+	if err == nil {
+		t.Fatal("NewFile should fail to create the same file twice")
+	}
+
+	// We have created only two files
+	entries, err = ioutil.ReadDir(dir.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(entries) != 2 {
+		t.Fatalf("ReadDir should have two elements, has %d elements",
+			len(entries))
+	}
+
+	// Verify that deletion works
+	err = dir.Delete()
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = os.Stat(dir.Name)
+	if err == nil {
+		t.Fatal("Directory should be gone, still present.")
+	}
+}

vendor/k8s.io/utils/temp/doc.go

@@ -0,0 +1,19 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package temp provides an interface to handle temporary files and
+// directories.
+package temp // import "k8s.io/utils/temp"

vendor/k8s.io/utils/temp/temptest/dir.go

@@ -0,0 +1,66 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package temptest
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"k8s.io/utils/temp"
+)
+
+// FakeDir implements a Directory that is not backed on the
+// filesystem. This is useful for testing since the created "files" are
+// simple bytes.Buffer that can be inspected.
+type FakeDir struct {
+	Files   map[string]*FakeFile
+	Deleted bool
+}
+
+var _ temp.Directory = &FakeDir{}
+
+// NewFile returns a new FakeFile if the filename doesn't exist already.
+// This function will fail if the directory has already been deleted.
+func (d *FakeDir) NewFile(name string) (io.WriteCloser, error) {
+	if d.Deleted {
+		return nil, errors.New("can't create file in deleted FakeDir")
+	}
+	if d.Files == nil {
+		d.Files = map[string]*FakeFile{}
+	}
+	f := d.Files[name]
+	if f != nil {
+		return nil, fmt.Errorf(
+			"FakeDir already has file named %q",
+			name,
+		)
+	}
+	f = &FakeFile{}
+	d.Files[name] = f
+	return f, nil
+}
+
+// Delete doesn't remove anything, but records that the directory has
+// been deleted.
+func (d *FakeDir) Delete() error {
+	if d.Deleted {
+		return errors.New("failed to re-delete FakeDir")
+	}
+	d.Deleted = true
+	return nil
+}

vendor/k8s.io/utils/temp/temptest/dir_test.go

@@ -0,0 +1,67 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package temptest
+
+import (
+	"io"
+	"testing"
+)
+
+func TestFakeDir(t *testing.T) {
+	d := &FakeDir{}
+
+	f, err := d.NewFile("ONE")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	n, err := io.WriteString(f, "Bonjour!")
+	if n != 8 || err != nil {
+		t.Fatalf(
+			`WriteString(f, "Bonjour!") = (%v, %v), expected (%v, %v)`,
+			n, err,
+			0, nil,
+		)
+	}
+	if got := d.Files["ONE"].Buffer.String(); got != "Bonjour!" {
+		t.Fatalf(`file content is %q, expected "Bonjour!"`, got)
+	}
+
+	f, err = d.NewFile("ONE")
+	if err == nil {
+		t.Fatal("Same file could be created twice.")
+	}
+
+	err = d.Delete()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = d.Delete()
+	if err == nil {
+		t.Fatal("FakeDir could be deleted twice.")
+	}
+
+	f, err = d.NewFile("TWO")
+	if err == nil {
+		t.Fatal("NewFile could be created in deleted dir")
+	}
+
+	if !d.Deleted {
+		t.Fatal("FakeDir should be deleted.")
+	}
+}

vendor/k8s.io/utils/temp/temptest/doc.go

@@ -0,0 +1,19 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package temptest provides utilities for testing temp
+// files/directories testing.
+package temptest

vendor/k8s.io/utils/temp/temptest/example_test.go

@@ -0,0 +1,57 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package temptest
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"k8s.io/utils/temp"
+)
+
+func TestedCode(dir temp.Directory) error {
+	f, err := dir.NewFile("filename")
+	if err != nil {
+		return err
+	}
+	_, err = io.WriteString(f, "Bonjour!")
+	if err != nil {
+		return err
+	}
+	return dir.Delete()
+}
+
+func Example() {
+	dir := FakeDir{}
+
+	err := TestedCode(&dir)
+	if err != nil {
+		panic(err)
+	}
+
+	if dir.Deleted == false {
+		panic(errors.New("Directory should have been deleted."))
+	}
+
+	if dir.Files["filename"] == nil {
+		panic(errors.New(`"filename" should have been created.`))
+	}
+
+	fmt.Println(dir.Files["filename"].Buffer.String())
+	// Output: Bonjour!
+}

vendor/k8s.io/utils/temp/temptest/file.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package temptest
+
+import (
+	"bytes"
+	"errors"
+	"io"
+)
+
+// FakeFile is an implementation of a WriteCloser, that records what has
+// been written in the file (in a bytes.Buffer) and if the file has been
+// closed.
+type FakeFile struct {
+	Buffer bytes.Buffer
+	Closed bool
+}
+
+var _ io.WriteCloser = &FakeFile{}
+
+// Write appends the contents of p to the Buffer. If the file has
+// already been closed, an error is returned.
+func (f *FakeFile) Write(p []byte) (n int, err error) {
+	if f.Closed {
+		return 0, errors.New("can't write to closed FakeFile")
+	}
+	return f.Buffer.Write(p)
+}
+
+// Close records that the file has been closed. If the file has already
+// been closed, an error is returned.
+func (f *FakeFile) Close() error {
+	if f.Closed {
+		return errors.New("FakeFile was closed multiple times")
+	}
+	f.Closed = true
+	return nil
+}

vendor/k8s.io/utils/temp/temptest/file_test.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package temptest
+
+import (
+	"io"
+	"testing"
+)
+
+func TestFakeFile(t *testing.T) {
+	f := &FakeFile{}
+
+	n, err := io.WriteString(f, "Bonjour!")
+	if n != 8 || err != nil {
+		t.Fatalf(
+			`WriteString(f, "Bonjour!") = (%v, %v), expected (%v, %v)`,
+			n, err,
+			8, nil,
+		)
+	}
+
+	err = f.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// File can't be closed twice.
+	err = f.Close()
+	if err == nil {
+		t.Fatal("FakeFile could be closed twice")
+	}
+
+	// File is not writable after close.
+	n, err = io.WriteString(f, "Bonjour!")
+	if n != 0 || err == nil {
+		t.Fatalf(
+			`WriteString(f, "Bonjour!") = (%v, %v), expected (%v, %v)`,
+			n, err,
+			0, "non-nil",
+		)
+	}
+}