from dulwich import porcelain
from dulwich import repo
import os


def is_file_locked(file_path):
    try:
        with open(file_path, 'r'):
            return False
    except IOError:
        return True


def close_file(file_object):
    file_object.close()


def release_file_resource(file_path):
    file_descriptor = os.open(file_path, os.O_RDONLY)
    os.close(file_descriptor)


def unlock_file(file_path):
    if is_file_locked(file_path):
        with open(file_path, 'r') as file:
            close_file(file)
        release_file_resource(file_path)


def ro():
    os.system("/etc/init.d/S01mount_ro start")


def rw():
    os.system("/etc/init.d/S01mount_ro stop")


def checkout(rep, branch):
    r = repo.Repo(rep)
    try:
        porcelain.checkout_branch(r, 'origin/' + branch)
    except porcelain.CheckoutError:
        print("Error")
        porcelain.reset(r, 'hard')
        porcelain.checkout_branch(r, 'origin/' + branch)


localrep = "/home/"
unlockfile = localrep + "cclb_launch"

rw()
unlock_file(unlockfile)
if porcelain.active_branch(localrep) != b'master':
    checkout(localrep, 'master')
else:
    checkout(localrep, 'en')
ro()