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cmd.go
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cmd.go
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/*
Copyright 2019 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 util
import (
"bufio"
"bytes"
"io"
"os"
"os/exec"
"strings"
"github.com/pkg/errors"
)
// Cmd implements a wrapper on os/exec.cmd
type Cmd struct {
command string
args []string
stdin io.Reader
stdout io.Writer
stderr io.Writer
}
func NewCmd(command string, args ...string) *Cmd {
return &Cmd{
command: command,
args: args,
}
}
func (c *Cmd) Run() error {
return c.runInnerCommand()
}
func (c *Cmd) RunWithEcho() error {
c.stdout = os.Stderr
c.stderr = os.Stdout
return c.runInnerCommand()
}
func (c *Cmd) RunAndCapture() (lines []string, err error) {
var buff bytes.Buffer
c.stdout = &buff
c.stderr = &buff
err = c.runInnerCommand()
scanner := bufio.NewScanner(&buff)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
return lines, err
}
func (c *Cmd) Stdin(in io.Reader) *Cmd {
c.stdin = in
return c
}
func (c *Cmd) runInnerCommand() error {
cmd := exec.Command(c.command, c.args...) //nolint:gosec
if c.stdin != nil {
cmd.Stdin = c.stdin
}
if c.stdout != nil {
cmd.Stdout = c.stdout
}
var b1 strings.Builder
cmd.Stderr = &b1
if c.stderr != nil {
cmd.Stderr = io.MultiWriter(&b1, c.stderr)
}
err := cmd.Run()
if err != nil {
return errors.Wrapf(err, "failed to run: %s %s\n%s", c.command, strings.Join(c.args, " "), b1.String())
}
return nil
}