package util

import (
	"bufio"
	"errors"
	"os"
	"strings"
)

// HostnameFromFile : Returns the contents of the /etc/hostname file
func HostnameFromFile() (string, error) {
	file, err := os.Open("/etc/hostname")
	if err != nil {
		return "", err
	}
	defer file.Close()

	s := bufio.NewScanner(file)
	for s.Scan() {
		readLine := s.Text()
		hostname := strings.TrimRightFunc(readLine, func(c rune) bool {
			return c == '\r' || c == '\n'
		})
		return hostname, nil
	}
	return "", errors.New("no lines in /etc/hostname")
}