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@ -341,3 +341,46 @@ func WaitTimeout(c *exec.Cmd, timeout time.Duration) error {
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return ErrTimeout
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}
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}
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// https://gist.github.com/kylelemons/1525278
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func Pipeline(cmds ...*exec.Cmd) ([]byte, []byte, error) {
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// Require at least one command
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if len(cmds) < 1 {
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return nil, nil, nil
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}
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// Collect the output from the command(s)
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var output bytes.Buffer
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var stderr bytes.Buffer
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last := len(cmds) - 1
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for i, cmd := range cmds[:last] {
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var err error
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// Connect each command's stdin to the previous command's stdout
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if cmds[i+1].Stdin, err = cmd.StdoutPipe(); err != nil {
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return nil, nil, err
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}
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// Connect each command's stderr to a buffer
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cmd.Stderr = &stderr
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}
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// Connect the output and error for the last command
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cmds[last].Stdout, cmds[last].Stderr = &output, &stderr
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// Start each command
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for _, cmd := range cmds {
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if err := cmd.Start(); err != nil {
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return output.Bytes(), stderr.Bytes(), err
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}
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}
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// Wait for each command to complete
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for _, cmd := range cmds {
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if err := cmd.Wait(); err != nil {
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return output.Bytes(), stderr.Bytes(), err
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}
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}
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// Return the pipeline output and the collected standard error
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return output.Bytes(), stderr.Bytes(), nil
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}
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