mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-10-29 21:01:02 +00:00
130 lines
3.8 KiB
Go
130 lines
3.8 KiB
Go
/*
|
|
Copyright 2014 The Kubernetes Authors All rights reserved.
|
|
|
|
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 (
|
|
osexec "os/exec"
|
|
"syscall"
|
|
)
|
|
|
|
// 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
|
|
|
|
// 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 {
|
|
// 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)
|
|
}
|
|
|
|
// 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...))
|
|
}
|
|
|
|
// 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
|
|
|
|
func (cmd *cmdWrapper) SetDir(dir string) {
|
|
cmd.Dir = dir
|
|
}
|
|
|
|
// CombinedOutput is part of the Cmd interface.
|
|
func (cmd *cmdWrapper) CombinedOutput() ([]byte, error) {
|
|
out, err := (*osexec.Cmd)(cmd).CombinedOutput()
|
|
if err != nil {
|
|
return out, handleError(err)
|
|
}
|
|
return out, nil
|
|
}
|
|
|
|
func (cmd *cmdWrapper) Output() ([]byte, error) {
|
|
out, err := (*osexec.Cmd)(cmd).Output()
|
|
if err != nil {
|
|
return out, handleError(err)
|
|
}
|
|
return out, nil
|
|
}
|
|
|
|
func handleError(err error) error {
|
|
if ee, ok := err.(*osexec.ExitError); ok {
|
|
// Force a compile fail if exitErrorWrapper can't convert to ExitError.
|
|
var x ExitError = &exitErrorWrapper{ee}
|
|
return x
|
|
}
|
|
if ee, ok := err.(*osexec.Error); ok {
|
|
if ee.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
|
|
}
|
|
|
|
// 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()
|
|
}
|