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package command
import (
"log"
"os/exec"
"syscall"
)
// run the OS command and return its output. If the output returns error it also
// encapsulates it as a golang.error which is a return code of the command except
// zero
func RunCommandWithOutput(dir string, command string, args []string) (string, error) {
cmd := exec.Command(command, args...)
if dir != "" {
cmd.Dir = dir
}
output, err := cmd.Output()
return string(output), err
}
// if we supposed to get return value as an int of a command this method can be
// used. It is practical when you use a command and process a failover acoording
// to a soecific return code
func GetCommandStatus(dir string, command string, args []string) (int, error) {
cmd := exec.Command(command, args...)
if dir != "" {
cmd.Dir = dir
}
var err error
// this time the execution is a little different
if err := cmd.Start(); err != nil {
return -1, err
}
if err := cmd.Wait(); err != nil {
if exiterr, ok := err.(*exec.ExitError); ok {
// The program has exited with an exit code != 0
// This works on both Unix and Windows. Although package
// syscall is generally platform dependent, WaitStatus is
// defined for both Unix and Windows and in both cases has
// an ExitStatus() method with the same signature.
if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
statusCode := status.ExitStatus()
return statusCode, err
}
} else {
log.Fatalf("cmd.Wait: %v", err)
}
}
return -1, err
}
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