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hymkor avatar hymkor commented on August 28, 2024

os/exec".Cmd.Output() waits until the command terminates.
And expect() watches the console directly and ignores stdout and stderr.

You had better to use "os/exec".Cmd.StdoutPipe().
https://golang.org/pkg/os/exec/#Cmd.StdoutPipe

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tangingw avatar tangingw commented on August 28, 2024

Thanks. I will try it in a short while and let you know the result.

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tangingw avatar tangingw commented on August 28, 2024

Hi,

I wrote a very simple and lousy to test your POC. It didn't print out the stdout.

package main

import (
	"fmt"
	"os/exec"
	"time"
	
)

func main() {

	cmd := exec.Command(
		"expect.exe",
		"test2.lua", 
		"192.168.10.1",
	)

	readStdout := make([]byte, 65536)

	stdout, err := cmd.StdoutPipe()

	if err != nil {
		panic(err)
	}
	startErr := cmd.Start()

	if startErr != nil {
		panic(startErr)
	}

	read, ioError := stdout.Read(readStdout)
	
	if ioError != nil {
		panic(ioError)
	}

	//if waitError := cmd.Wait(); waitError != nil {
	//	panic(waitError)
	//}
	time.Sleep(time.Second*10)
	fmt.Println(string(read))

}

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hymkor avatar hymkor commented on August 28, 2024

stdout.Read() may wait until expect.exe outputs 65536 bytes data or closes its stdout.

And I am afraid that It does not work as expected whether it is fixed or not.

The line without CRLF(= password prompt) may not be output(flushed) by plink.exe when stdout is redirected.
Because it is buffered until CRLF is written in plink.exe.
So my function expect() sees console directly (not redirected stdout) .

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hymkor avatar hymkor commented on August 28, 2024

If there are no responses until tomorrow, I will close this issue.

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tangingw avatar tangingw commented on August 28, 2024

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hymkor avatar hymkor commented on August 28, 2024

Thank you for replay.

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