mirror of
https://github.com/kubernetes-sigs/kind.git
synced 2025-11-30 23:16:04 +07:00
143 lines
3.5 KiB
Go
143 lines
3.5 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package exec
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import (
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"bufio"
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"bytes"
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"io"
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"os"
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"strings"
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"al.essio.dev/pkg/shellescape"
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"sigs.k8s.io/kind/pkg/errors"
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)
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// PrettyCommand takes arguments identical to Cmder.Command,
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// it returns a pretty printed command that could be pasted into a shell
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func PrettyCommand(name string, args ...string) string {
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var out strings.Builder
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out.WriteString(shellescape.Quote(name))
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for _, arg := range args {
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out.WriteByte(' ')
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out.WriteString(shellescape.Quote(arg))
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}
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return out.String()
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}
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// RunErrorForError returns a RunError if the error contains a RunError.
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// Otherwise it returns nil
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func RunErrorForError(err error) *RunError {
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var runError *RunError
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for {
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if rErr, ok := err.(*RunError); ok {
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runError = rErr
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}
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if causerErr, ok := err.(errors.Causer); ok {
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err = causerErr.Cause()
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} else {
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break
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}
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}
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return runError
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}
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// CombinedOutputLines is like os/exec's cmd.CombinedOutput(),
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// but over our Cmd interface, and instead of returning the byte buffer of
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// stderr + stdout, it scans these for lines and returns a slice of output lines
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func CombinedOutputLines(cmd Cmd) (lines []string, err error) {
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var buff bytes.Buffer
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cmd.SetStdout(&buff)
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cmd.SetStderr(&buff)
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err = cmd.Run()
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scanner := bufio.NewScanner(&buff)
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for scanner.Scan() {
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lines = append(lines, scanner.Text())
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}
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return lines, err
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}
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// OutputLines is like os/exec's cmd.Output(),
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// but over our Cmd interface, and instead of returning the byte buffer of
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// stdout, it scans these for lines and returns a slice of output lines
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func OutputLines(cmd Cmd) (lines []string, err error) {
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var buff bytes.Buffer
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cmd.SetStdout(&buff)
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err = cmd.Run()
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scanner := bufio.NewScanner(&buff)
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for scanner.Scan() {
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lines = append(lines, scanner.Text())
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}
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return lines, err
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}
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// Output is like os/exec's cmd.Output, but over our Cmd interface
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func Output(cmd Cmd) ([]byte, error) {
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var buff bytes.Buffer
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cmd.SetStdout(&buff)
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err := cmd.Run()
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return buff.Bytes(), err
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}
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// InheritOutput sets cmd's output to write to the current process's stdout and stderr
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func InheritOutput(cmd Cmd) Cmd {
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cmd.SetStderr(os.Stderr)
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cmd.SetStdout(os.Stdout)
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return cmd
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}
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// RunWithStdoutReader runs cmd with stdout piped to readerFunc
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func RunWithStdoutReader(cmd Cmd, readerFunc func(io.Reader) error) error {
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pr, pw, err := os.Pipe()
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if err != nil {
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return err
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}
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cmd.SetStdout(pw)
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return errors.AggregateConcurrent([]func() error{
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func() error {
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defer pr.Close()
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return readerFunc(pr)
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},
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func() error {
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defer pw.Close()
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return cmd.Run()
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},
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})
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}
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// RunWithStdinWriter runs cmd with writerFunc piped to stdin
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func RunWithStdinWriter(cmd Cmd, writerFunc func(io.Writer) error) error {
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pr, pw, err := os.Pipe()
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if err != nil {
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return err
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}
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cmd.SetStdin(pr)
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return errors.AggregateConcurrent([]func() error{
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func() error {
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defer pw.Close()
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return writerFunc(pw)
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},
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func() error {
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defer pr.Close()
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return cmd.Run()
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},
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})
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}
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