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add new dependencies required by CRI hook

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Added k8s/utils/exec and k8s/utils/exec/testing dependencies,
regenerated Gopkg.lock with "dep ensure && dep prune"
This commit is contained in:
Ed Bartosh 2018-06-19 11:20:23 +03:00
parent 31c93a293e
commit 76dc3f94e0
11 changed files with 880 additions and 0 deletions
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revision = "fc32d2f3698e36b93322a3465f63a14e9f0eaead" revision = "fc32d2f3698e36b93322a3465f63a14e9f0eaead"
version = "v1.10.0" version = "v1.10.0"
[[projects]]
branch = "master"
name = "k8s.io/utils"
packages = [
"exec",
"exec/testing"
]
revision = "258e2a2fa64568210fbd6267cf1d8fd87c3cb86e"
[solve-meta] [solve-meta]
analyzer-name = "dep" analyzer-name = "dep"
analyzer-version = 1 analyzer-version = 1

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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 ./...

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# 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.

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# 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/temptest) 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

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

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/*
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"

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/*
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
}

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/*
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)
}
}

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/*
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!
}

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/*
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
}