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package media
import (
"bytes"
"fmt"
"os/exec"
"time"
)
func cmdExists(cmd string) bool {
_, err := exec.LookPath(cmd)
return err == nil
}
func runCmd(timeout int, command string, args ...string) error {
// instantiate new command
cmd := exec.Command(command, args...)
// get pipe to standard output
stdout, err := cmd.StdoutPipe()
if err != nil {
return fmt.Errorf("cmd.StdoutPipe() error: %w", err)
}
// start process via command
if err := cmd.Start(); err != nil {
return fmt.Errorf("cmd.Start() error: %w", err)
}
// setup a buffer to capture standard output
var buf bytes.Buffer
// create a channel to capture any errors from wait
done := make(chan error)
go func() {
if _, err := buf.ReadFrom(stdout); err != nil {
panic("buf.Read(stdout) error: " + err.Error())
}
done <- cmd.Wait()
}()
// block on select, and switch based on actions received
select {
case <-time.After(time.Duration(timeout) * time.Second):
if err := cmd.Process.Kill(); err != nil {
return fmt.Errorf("failed to kill: %w", err)
}
return fmt.Errorf("timeout reached, process killed")
case err := <-done:
if err != nil {
close(done)
return fmt.Errorf("process done, with error: %w", err)
}
return nil
}
}
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