78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
package dns
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import (
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"bytes"
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"io"
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"os"
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"os/exec"
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"sync"
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"k8s.io/klog/v2"
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)
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// CapturingPassThroughWriter is a writer that remembers
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// data written to it and passes it to w
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type CapturingPassThroughWriter struct {
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buf bytes.Buffer
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w io.Writer
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}
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// NewCapturingPassThroughWriter creates new CapturingPassThroughWriter
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func NewCapturingPassThroughWriter(w io.Writer) *CapturingPassThroughWriter {
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return &CapturingPassThroughWriter{
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w: w,
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}
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}
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func (w *CapturingPassThroughWriter) Write(d []byte) (int, error) {
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w.buf.Write(d)
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return w.w.Write(d)
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}
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// Bytes returns bytes written to the writer
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func (w *CapturingPassThroughWriter) Bytes() []byte {
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return w.buf.Bytes()
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}
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func Execute(shell string, arg ...string) (bool, error) {
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var errStdout, errStderr error
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crlf := []byte("\r\n")
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lf := []byte("\n")
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cmd := exec.Command(shell, arg...)
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stdoutIn, _ := cmd.StdoutPipe()
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stderrIn, _ := cmd.StderrPipe()
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stdout := NewCapturingPassThroughWriter(os.Stdout)
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stderr := NewCapturingPassThroughWriter(os.Stderr)
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err := cmd.Start()
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if err != nil {
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klog.Fatalf("cmd.Start() failed with '%s'\n", err)
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}
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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_, errStdout = io.Copy(stdout, stdoutIn)
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wg.Done()
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}()
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_, errStderr = io.Copy(stderr, stderrIn)
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wg.Wait()
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err = cmd.Wait()
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if err != nil {
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klog.Fatalf("cmd.Run() failed with %s\n", err)
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}
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if errStdout != nil || errStderr != nil {
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klog.Fatalf("failed to capture stdout or stderr\n")
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}
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//outStr, errStr := string(stdout.Bytes()), string(stderr.Bytes())
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//fmt.Printf("\nout:\n%s\nerr:\n%s\n", outStr, errStr)
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errb := bytes.TrimSuffix(stderr.Bytes(), crlf)
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errb = bytes.TrimSuffix(errb, lf)
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if stderr != nil {
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klog.Infof("err:\n%s\n", string(errb))
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}
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return true, nil
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}
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