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47 lines
1.0 KiB
47 lines
1.0 KiB
package utils
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import (
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"bytes"
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"errors"
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"io"
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"os/exec"
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)
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// A simple ExecPipe() pipes exec.Cmd together - somewhat similar to how bash pipes "|" behave.
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// Each command's standard output is connected to the standard input of the next command
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// and the output of the final command is returned
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func ExecPipe(cmds ...*exec.Cmd) (pipeLineOutput io.Reader, pipeLineError error) {
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// Require at least one command
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if len(cmds) < 1 {
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return nil, errors.New("Invalid argument")
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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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lastIndex := len(cmds) - 1
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for i, cmd := range cmds[:lastIndex] {
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cmds[i+1].Stdin, _ = cmd.StdoutPipe()
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}
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// Final ---> output buffer
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cmds[lastIndex].Stdout = &output
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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, err
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}
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}
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// We should 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, err
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}
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}
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// Return the output
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return &output, nil
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}
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