Check if the program is already running. This is to get around doing deamons in Go and use crontab as a hack.

amIrunning.go

// Check to see if the program is already running. returns true if it is or false if it is not.
func amIrunning(myname string) bool {

	currentpid := os.Getpid()                 // Get the current process ID
	currentpidStr := strconv.Itoa(currentpid) // Convert the current process ID to a string

	cmd := exec.Command("ps", "aux") // Run the ps aux command to get a list of all running processes
	out, err := cmd.CombinedOutput() // Get the output of the command, both srtdout and stderr
	if err != nil {
		ErrorLogger.Println("Error running ps aux", err)
		panic(err) // If there is an error, panic. Dont like doing this.
	}

	found := false // Set the found flag to false as we have not found the program running yet

	lines := strings.Split(string(out), "\n") // Split the output of the ps aux command into lines

	// Loop through each line of the output
	for _, line := range lines {

		subs := strings.Fields(line) // Split the line into fields. This skips multi blank seperators.
		if len(subs) < 10 {          // If there are less than 10 fields, skip this line
			continue
		}

		prgname := filepath.Base(strings.TrimSpace(subs[10])) // Get the program name from the 10th field
		prgpid := strings.TrimSpace(subs[1])                  // Get the process ID from the 2nd field

		// The order of the checks is very important

		// Check if the program's pid is the same as the current output of 'ps aux'
		if prgpid == currentpidStr {
			//InfoLogger.Println("Found my own pid", prgpid, currentpidStr)
			continue // It is the same, so skip this line
		}

		//InfoLogger.Println("Checking", prgname, myname)

		// Check if the program name is the same as the current program name
		if prgname == myname {
			found = true // Set the found flag to true
			break        // Break out of the loop
		}
	}

	return found // Return the found flag
}